

<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivities" xlink:href="nrg-20150930.xsd#AccountingForDerivativeInstrumentsAndHedgingActivities" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesAociDetails" xlink:href="nrg-20150930.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesAociDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesFvOfDerivativesDetails" xlink:href="nrg-20150930.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesFvOfDerivativesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesImpactToStatementOfOperationsDetails" xlink:href="nrg-20150930.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesImpactToStatementOfOperationsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesTables" xlink:href="nrg-20150930.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/BusinessAcquisitions" xlink:href="nrg-20150930.xsd#BusinessAcquisitions" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsAltaWindDetails" xlink:href="nrg-20150930.xsd#BusinessAcquisitionsBusinessAcquisitionsAltaWindDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsDesertSunlightSpringCanyonfuelCellDetails" xlink:href="nrg-20150930.xsd#BusinessAcquisitionsBusinessAcquisitionsDesertSunlightSpringCanyonfuelCellDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsJanuary2015DropDownsDetails" xlink:href="nrg-20150930.xsd#BusinessAcquisitionsBusinessAcquisitionsJanuary2015DropDownsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsJune2014DropDownsDetails" xlink:href="nrg-20150930.xsd#BusinessAcquisitionsBusinessAcquisitionsJune2014DropDownsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsNovember2015DropDownDetails" xlink:href="nrg-20150930.xsd#BusinessAcquisitionsBusinessAcquisitionsNovember2015DropDownDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsTables" xlink:href="nrg-20150930.xsd#BusinessAcquisitionsBusinessAcquisitionsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructure" xlink:href="nrg-20150930.xsd#ChangesInCapitalStructure" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructureChangesInCapitalStructureDividendsDetails" xlink:href="nrg-20150930.xsd#ChangesInCapitalStructureChangesInCapitalStructureDividendsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructureChangesInCapitalStructureRecapitalizationAndStockIssuanceDetails" xlink:href="nrg-20150930.xsd#ChangesInCapitalStructureChangesInCapitalStructureRecapitalizationAndStockIssuanceDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructureStockholdersEquityTables" xlink:href="nrg-20150930.xsd#ChangesInCapitalStructureStockholdersEquityTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedBalanceSheets" xlink:href="nrg-20150930.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="nrg-20150930.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="nrg-20150930.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:href="nrg-20150930.xsd#CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeParenthetical" xlink:href="nrg-20150930.xsd#CondensedConsolidatedStatementsOfComprehensiveIncomeParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfOperations" xlink:href="nrg-20150930.xsd#CondensedConsolidatedStatementsOfOperations" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/DocumentAndEntityInformation" xlink:href="nrg-20150930.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/EarningsPerShare" xlink:href="nrg-20150930.xsd#EarningsPerShare" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/EarningsPerShareDetails" xlink:href="nrg-20150930.xsd#EarningsPerShareDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/EarningsPerShareTables" xlink:href="nrg-20150930.xsd#EarningsPerShareTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstruments" xlink:href="nrg-20150930.xsd#FairValueOfFinancialInstruments" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsBalanceSheetGroupingDetails" xlink:href="nrg-20150930.xsd#FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsBalanceSheetGroupingDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsCreditRiskAndDerivativeFvMeasurementsDetails" xlink:href="nrg-20150930.xsd#FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsCreditRiskAndDerivativeFvMeasurementsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsRecurringFairValueDetails" xlink:href="nrg-20150930.xsd#FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsRecurringFairValueDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsTables" xlink:href="nrg-20150930.xsd#FairValueOfFinancialInstrumentsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/IncomeTaxes" xlink:href="nrg-20150930.xsd#IncomeTaxes" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/IncomeTaxesProvisionDetails" xlink:href="nrg-20150930.xsd#IncomeTaxesProvisionDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/IncomeTaxesTables" xlink:href="nrg-20150930.xsd#IncomeTaxesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/LongTermDebt" xlink:href="nrg-20150930.xsd#LongTermDebt" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/LongTermDebtLongTermDebtAltaAvenalwestHoldingsDetails" xlink:href="nrg-20150930.xsd#LongTermDebtLongTermDebtAltaAvenalwestHoldingsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/LongTermDebtLongTermDebtCorporateDebtDetails" xlink:href="nrg-20150930.xsd#LongTermDebtLongTermDebtCorporateDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/LongTermDebtLongTermDebtDebtTableDetails" xlink:href="nrg-20150930.xsd#LongTermDebtLongTermDebtDebtTableDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/LongTermDebtLongTermDebtJanuary2015DropDownsDetails" xlink:href="nrg-20150930.xsd#LongTermDebtLongTermDebtJanuary2015DropDownsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/LongTermDebtTables" xlink:href="nrg-20150930.xsd#LongTermDebtTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/NatureOfBusiness" xlink:href="nrg-20150930.xsd#NatureOfBusiness" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/NatureOfBusinessDetails" xlink:href="nrg-20150930.xsd#NatureOfBusinessDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/NatureOfBusinessNatureOfBusinessTables" xlink:href="nrg-20150930.xsd#NatureOfBusinessNatureOfBusinessTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/PropertyPlantAndEquipment" xlink:href="nrg-20150930.xsd#PropertyPlantAndEquipment" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/PropertyPlantAndEquipmentDetails" xlink:href="nrg-20150930.xsd#PropertyPlantAndEquipmentDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/PropertyPlantAndEquipmentTables" xlink:href="nrg-20150930.xsd#PropertyPlantAndEquipmentTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/RelatedPartyTransactions" xlink:href="nrg-20150930.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/RelatedPartyTransactionsDetails" xlink:href="nrg-20150930.xsd#RelatedPartyTransactionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/SegmentReporting" xlink:href="nrg-20150930.xsd#SegmentReporting" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/SegmentReportingDetails" xlink:href="nrg-20150930.xsd#SegmentReportingDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/SegmentReportingSegmentReportingPolicies" xlink:href="nrg-20150930.xsd#SegmentReportingSegmentReportingPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/SegmentReportingTables" xlink:href="nrg-20150930.xsd#SegmentReportingTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="nrg-20150930.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:href="nrg-20150930.xsd#SummaryOfSignificantAccountingPoliciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesPolicies" xlink:href="nrg-20150930.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesTables" xlink:href="nrg-20150930.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntities" xlink:href="nrg-20150930.xsd#VariableInterestEntities" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesTables" xlink:href="nrg-20150930.xsd#VariableInterestEntitiesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesAltaTeHoldcoDetails" xlink:href="nrg-20150930.xsd#VariableInterestEntitiesVariableInterestEntitiesAltaTeHoldcoDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesDesertSunlightDetails" xlink:href="nrg-20150930.xsd#VariableInterestEntitiesVariableInterestEntitiesDesertSunlightDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesDgpvDetails" xlink:href="nrg-20150930.xsd#VariableInterestEntitiesVariableInterestEntitiesDgpvDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesGenconnDetails" xlink:href="nrg-20150930.xsd#VariableInterestEntitiesVariableInterestEntitiesGenconnDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesRpvDetails" xlink:href="nrg-20150930.xsd#VariableInterestEntitiesVariableInterestEntitiesRpvDetails" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivities" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesAociDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_957DE921CEC39AA75358A5288CDF883C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:to="loc_us-gaap_DerivativeTable_957DE921CEC39AA75358A5288CDF883C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_D26ADC7E854A95F9F71AA5288CDF2B41" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_957DE921CEC39AA75358A5288CDF883C" xlink:to="loc_us-gaap_StatementScenarioAxis_D26ADC7E854A95F9F71AA5288CDF2B41" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_EE4D377FC51259A53780A5288CDF2A72_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_D26ADC7E854A95F9F71AA5288CDF2B41" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_EE4D377FC51259A53780A5288CDF2A72_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_EE4D377FC51259A53780A5288CDF2A72" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_D26ADC7E854A95F9F71AA5288CDF2B41" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_EE4D377FC51259A53780A5288CDF2A72" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SuccessorMember" xlink:label="loc_us-gaap_SuccessorMember_A49D447B94B672AEEAC2A5288CDF2EB4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_EE4D377FC51259A53780A5288CDF2A72" xlink:to="loc_us-gaap_SuccessorMember_A49D447B94B672AEEAC2A5288CDF2EB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_5FB7701744E85CDCC408A5288CDF01B7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_957DE921CEC39AA75358A5288CDF883C" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_5FB7701744E85CDCC408A5288CDF01B7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_9CECD513F77540AF6020A5288CDFB561_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5FB7701744E85CDCC408A5288CDF01B7" xlink:to="loc_us-gaap_EquityComponentDomain_9CECD513F77540AF6020A5288CDFB561_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_9CECD513F77540AF6020A5288CDFB561" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5FB7701744E85CDCC408A5288CDF01B7" xlink:to="loc_us-gaap_EquityComponentDomain_9CECD513F77540AF6020A5288CDFB561" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_9833E4BCC1FCE8598882A5288CDF03ED" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9CECD513F77540AF6020A5288CDFB561" xlink:to="loc_us-gaap_NoncontrollingInterestMember_9833E4BCC1FCE8598882A5288CDF03ED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_903BEA1C6F166F16045DA5288CDF0DB8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_957DE921CEC39AA75358A5288CDF883C" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_903BEA1C6F166F16045DA5288CDF0DB8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_A27A4AB7A7179253E23FA5288CDF7DE4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_903BEA1C6F166F16045DA5288CDF0DB8" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_A27A4AB7A7179253E23FA5288CDF7DE4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_A27A4AB7A7179253E23FA5288CDF7DE4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_903BEA1C6F166F16045DA5288CDF0DB8" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_A27A4AB7A7179253E23FA5288CDF7DE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_BFEEA712284A3F3C3147A5288CDF4321" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_A27A4AB7A7179253E23FA5288CDF7DE4" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_BFEEA712284A3F3C3147A5288CDF4321" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_112FCB8FAD81AD569E34A5288CDF005E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_112FCB8FAD81AD569E34A5288CDF005E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount" xlink:label="loc_nrg_AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount_C2330EEF9E148353F53EA5288CDFCAD0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:to="loc_nrg_AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInGainLossFromCashFlowHedgesTaxAmount_C2330EEF9E148353F53EA5288CDFCAD0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_F562EECB2DDF0E1A1760A5288CDFED7B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_F562EECB2DDF0E1A1760A5288CDFED7B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_7FEE9AAA2006206C2AE5A5288CDF1313" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_7FEE9AAA2006206C2AE5A5288CDF1313" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_52B84354DCDE961E0D9CA5288CDFB9B0" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_52B84354DCDE961E0D9CA5288CDFB9B0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsTax" xlink:label="loc_nrg_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsTax_BE77F04657C3CF1FD2A2A5288CDF557E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:to="loc_nrg_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsTax_BE77F04657C3CF1FD2A2A5288CDF557E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet" xlink:label="loc_us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet_F8F656519C19F662A4DDA5288CDF3B33" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_615ECFAE9923F68C084CA5288CDFE8AD" xlink:to="loc_us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet_F8F656519C19F662A4DDA5288CDF3B33" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesFvOfDerivativesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_258348C20F5DBAEDB946435D75EA1E86" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_258348C20F5DBAEDB946435D75EA1E86" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnderlyingAssetClassAxis" xlink:label="loc_us-gaap_UnderlyingAssetClassAxis_359985F100105F272274435D75EA1017" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_258348C20F5DBAEDB946435D75EA1E86" xlink:to="loc_us-gaap_UnderlyingAssetClassAxis_359985F100105F272274435D75EA1017" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnderlyingAssetClassDomain" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_581ACE7D4D2BFA00FFDD435D75EAF9A5_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_359985F100105F272274435D75EA1017" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_581ACE7D4D2BFA00FFDD435D75EAF9A5_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnderlyingAssetClassDomain" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_581ACE7D4D2BFA00FFDD435D75EAF9A5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_359985F100105F272274435D75EA1017" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_581ACE7D4D2BFA00FFDD435D75EAF9A5" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_InterestMember" xlink:label="loc_nrg_InterestMember_169BD4BD0F51575662A8435D75EA0516" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_581ACE7D4D2BFA00FFDD435D75EAF9A5" xlink:to="loc_nrg_InterestMember_169BD4BD0F51575662A8435D75EA0516" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NaturalGasReservesMember" xlink:label="loc_us-gaap_NaturalGasReservesMember_E60591DE915678BFF68E435D75EA17EE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_581ACE7D4D2BFA00FFDD435D75EAF9A5" xlink:to="loc_us-gaap_NaturalGasReservesMember_E60591DE915678BFF68E435D75EA17EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_43B9AE7A3A1CB90ACE7D435D75EAED3D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_258348C20F5DBAEDB946435D75EA1E86" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_43B9AE7A3A1CB90ACE7D435D75EAED3D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_43B9AE7A3A1CB90ACE7D435D75EAED3D" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_43B9AE7A3A1CB90ACE7D435D75EAED3D" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_F5148E880C24CCE4567D435D75EA60F8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697" xlink:to="loc_us-gaap_CommodityContractMember_F5148E880C24CCE4567D435D75EA60F8" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_InterestRateContractCurrentMember" xlink:label="loc_nrg_InterestRateContractCurrentMember_046F906C2127F0CC9097435D75EA0845" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697" xlink:to="loc_nrg_InterestRateContractCurrentMember_046F906C2127F0CC9097435D75EA0845" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_InterestRateContractNonCurrentMember" xlink:label="loc_nrg_InterestRateContractNonCurrentMember_6DD91FE384279AAFFBAB435D75EAD0E7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697" xlink:to="loc_nrg_InterestRateContractNonCurrentMember_6DD91FE384279AAFFBAB435D75EAD0E7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CommodityContractCurrentMember" xlink:label="loc_nrg_CommodityContractCurrentMember_5954F01E3FC11A22E198435D75EA9253" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697" xlink:to="loc_nrg_CommodityContractCurrentMember_5954F01E3FC11A22E198435D75EA9253" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestRateContractMember" xlink:label="loc_us-gaap_InterestRateContractMember_02EEA93B92DF0EAFB813435D75EA8B4B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_C42832FE1C88B21E1F72435D75EAD697" xlink:to="loc_us-gaap_InterestRateContractMember_02EEA93B92DF0EAFB813435D75EA8B4B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_F88DB193BA94C8AAEEF2435D75EA263A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_258348C20F5DBAEDB946435D75EA1E86" xlink:to="loc_us-gaap_HedgingDesignationAxis_F88DB193BA94C8AAEEF2435D75EA263A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_95746E81D36865BDF4B3435D75EA8FFA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_F88DB193BA94C8AAEEF2435D75EA263A" xlink:to="loc_us-gaap_HedgingDesignationDomain_95746E81D36865BDF4B3435D75EA8FFA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_95746E81D36865BDF4B3435D75EA8FFA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_F88DB193BA94C8AAEEF2435D75EA263A" xlink:to="loc_us-gaap_HedgingDesignationDomain_95746E81D36865BDF4B3435D75EA8FFA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_A317559E8BC71A8BEEBB435D75EA77CC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_95746E81D36865BDF4B3435D75EA8FFA" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_A317559E8BC71A8BEEBB435D75EA77CC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_972C5C0C8597438E9C04435D75EA0237" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_95746E81D36865BDF4B3435D75EA8FFA" xlink:to="loc_us-gaap_NondesignatedMember_972C5C0C8597438E9C04435D75EA0237" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MeasurementUnitAxis" xlink:label="loc_nrg_MeasurementUnitAxis_F93E196384032B1DA2A1435D75EAB188" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_258348C20F5DBAEDB946435D75EA1E86" xlink:to="loc_nrg_MeasurementUnitAxis_F93E196384032B1DA2A1435D75EAB188" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MeasurementUnitDomain" xlink:label="loc_nrg_MeasurementUnitDomain_C4CD87C307F254020E5D435D75EA2DE3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_MeasurementUnitAxis_F93E196384032B1DA2A1435D75EAB188" xlink:to="loc_nrg_MeasurementUnitDomain_C4CD87C307F254020E5D435D75EA2DE3_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MeasurementUnitDomain" xlink:label="loc_nrg_MeasurementUnitDomain_C4CD87C307F254020E5D435D75EA2DE3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_MeasurementUnitAxis_F93E196384032B1DA2A1435D75EAB188" xlink:to="loc_nrg_MeasurementUnitDomain_C4CD87C307F254020E5D435D75EA2DE3" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MmbtuMember" xlink:label="loc_nrg_MmbtuMember_628B762D0E52DC4BE652435D75EA6618" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_MeasurementUnitDomain_C4CD87C307F254020E5D435D75EA2DE3" xlink:to="loc_nrg_MmbtuMember_628B762D0E52DC4BE652435D75EA6618" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/currency/2014/currency-2014-01-31.xsd#currency_USD" xlink:label="loc_currency_USD_3C6F6D615011C3F839CE435D75EA0547" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_MeasurementUnitDomain_C4CD87C307F254020E5D435D75EA2DE3" xlink:to="loc_currency_USD_3C6F6D615011C3F839CE435D75EA0547" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_DerivativeNotionalAmount" xlink:label="loc_invest_DerivativeNotionalAmount_644E924F1AC17163FE73435D75EAB418" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_invest_DerivativeNotionalAmount_644E924F1AC17163FE73435D75EAB418" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_822972C0C3020286E827435D75EACD88" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_822972C0C3020286E827435D75EACD88" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_3E7D3138487162A9ADE8435D75F47D89" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_3E7D3138487162A9ADE8435D75F47D89" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_FairValueofGrossDerivativeAssetsLiabilitiesNet" xlink:label="loc_nrg_FairValueofGrossDerivativeAssetsLiabilitiesNet_86726190E5A0AE653DE3435D75F4E820" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_nrg_FairValueofGrossDerivativeAssetsLiabilitiesNet_86726190E5A0AE653DE3435D75F4E820" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeAssetFairValueGrossLiability" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_0506261FD1605E233FFB435D75F4905D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_0506261FD1605E233FFB435D75F4905D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_80AE99910FE8DD4E12A6435D75F41EE7" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_80AE99910FE8DD4E12A6435D75F41EE7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset" xlink:label="loc_nrg_DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset_178E8E9B7EF2211A8FD1435D75F449DA" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_nrg_DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset_178E8E9B7EF2211A8FD1435D75F449DA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_02365BAE3F112C8A6B62435D75F445F3" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_DerivativeAssets_02365BAE3F112C8A6B62435D75F445F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_4D13BB1984367AE8B977435D75F49B23" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_DerivativeLiabilities_4D13BB1984367AE8B977435D75F49B23" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral" xlink:label="loc_nrg_DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral_77638ACBD7207B434C56435D75F41182" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_nrg_DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral_77638ACBD7207B434C56435D75F41182" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimCash" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_ABD903A40249472F0CD0435D75F490B2" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_ABD903A40249472F0CD0435D75F490B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnCash" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_1EF9B562DD37D867A0A0435D75F4C7D4" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1F5A3493F8E63489FD33435D75EAFFC0" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_1EF9B562DD37D867A0A0435D75F4C7D4" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesAccountingForDerivativeInstrumentsAndHedgingActivitiesImpactToStatementOfOperationsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1E43123BF850CE1D4BF4B54B577653A7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_44BD8CF4E5F5B605F9D4B54B5776790E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1E43123BF850CE1D4BF4B54B577653A7" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_44BD8CF4E5F5B605F9D4B54B5776790E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_00E699D3492B48D68441B54B577697EB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_44BD8CF4E5F5B605F9D4B54B5776790E" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_00E699D3492B48D68441B54B577697EB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_D7A90BCEE355C0D31464B54B5776A491_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_00E699D3492B48D68441B54B577697EB" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_D7A90BCEE355C0D31464B54B5776A491_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_D7A90BCEE355C0D31464B54B5776A491" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_00E699D3492B48D68441B54B577697EB" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_D7A90BCEE355C0D31464B54B5776A491" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestRateContractMember" xlink:label="loc_us-gaap_InterestRateContractMember_00B7438107E9F15BC5F2B54B5776C893" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_D7A90BCEE355C0D31464B54B5776A491" xlink:to="loc_us-gaap_InterestRateContractMember_00B7438107E9F15BC5F2B54B5776C893" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_B9281A220055A360B906B54B5776067B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_D7A90BCEE355C0D31464B54B5776A491" xlink:to="loc_us-gaap_CommodityContractMember_B9281A220055A360B906B54B5776067B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_2945EC60E9C711AB8489B54B5776F35E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_44BD8CF4E5F5B605F9D4B54B5776790E" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_2945EC60E9C711AB8489B54B5776F35E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_34AC12E270D17FF585FDB54B5776180E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_2945EC60E9C711AB8489B54B5776F35E" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_34AC12E270D17FF585FDB54B5776180E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_34AC12E270D17FF585FDB54B5776180E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_2945EC60E9C711AB8489B54B5776F35E" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_34AC12E270D17FF585FDB54B5776180E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpenseMember" xlink:label="loc_us-gaap_InterestExpenseMember_779B968F416BEFA60F7FB54B5776FF36" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_34AC12E270D17FF585FDB54B5776180E" xlink:to="loc_us-gaap_InterestExpenseMember_779B968F416BEFA60F7FB54B5776FF36" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesMember" xlink:label="loc_us-gaap_SalesMember_7A070B2A26DFB79A638FB54B57768C5B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_34AC12E270D17FF585FDB54B5776180E" xlink:to="loc_us-gaap_SalesMember_7A070B2A26DFB79A638FB54B57768C5B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnrealizedGainLossOnDerivatives" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_FD7C1E3F1D6BC95A7B76B54B5776671C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1E43123BF850CE1D4BF4B54B577653A7" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_FD7C1E3F1D6BC95A7B76B54B5776671C" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/BusinessAcquisitions" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsAltaWindDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_B293882B999BDDD2464BCE2227E749D9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_B293882B999BDDD2464BCE2227E749D9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_AA6335BD50D48AFB1427CE2227E7695A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_B293882B999BDDD2464BCE2227E749D9" xlink:to="loc_us-gaap_DebtInstrumentAxis_AA6335BD50D48AFB1427CE2227E7695A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3C61249EF56A394521ABCE222845DB65_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_AA6335BD50D48AFB1427CE2227E7695A" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3C61249EF56A394521ABCE222845DB65_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3C61249EF56A394521ABCE222845DB65" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_AA6335BD50D48AFB1427CE2227E7695A" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3C61249EF56A394521ABCE222845DB65" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_A5.375SeniorNotesduein2024Member" xlink:label="loc_nrg_A5.375SeniorNotesduein2024Member_165F6D3EE6E57A57FF21CE2228452656" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3C61249EF56A394521ABCE222845DB65" xlink:to="loc_nrg_A5.375SeniorNotesduein2024Member_165F6D3EE6E57A57FF21CE2228452656" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_7006ABE77A4959DF8B63CE222845C364" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_B293882B999BDDD2464BCE2227E749D9" xlink:to="loc_dei_LegalEntityAxis_7006ABE77A4959DF8B63CE222845C364" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_4DFB1610855F67DD46FECE22284581F6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_7006ABE77A4959DF8B63CE222845C364" xlink:to="loc_dei_EntityDomain_4DFB1610855F67DD46FECE22284581F6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_4DFB1610855F67DD46FECE22284581F6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_7006ABE77A4959DF8B63CE222845C364" xlink:to="loc_dei_EntityDomain_4DFB1610855F67DD46FECE22284581F6" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldOperatingLLCMember" xlink:label="loc_nrg_NRGYieldOperatingLLCMember_F34FCD447624D83ED616CE2228458BC1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4DFB1610855F67DD46FECE22284581F6" xlink:to="loc_nrg_NRGYieldOperatingLLCMember_F34FCD447624D83ED616CE2228458BC1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ACE355E9EC2F9772C7F9CE222845DB9A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_B293882B999BDDD2464BCE2227E749D9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ACE355E9EC2F9772C7F9CE222845DB9A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A923936952CBE55E18D2CE22284541FC_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ACE355E9EC2F9772C7F9CE222845DB9A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A923936952CBE55E18D2CE22284541FC_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A923936952CBE55E18D2CE22284541FC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ACE355E9EC2F9772C7F9CE222845DB9A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A923936952CBE55E18D2CE22284541FC" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LeaseholdRightsMember" xlink:label="loc_nrg_LeaseholdRightsMember_1474706FC81D33401581CE222845D20E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A923936952CBE55E18D2CE22284541FC" xlink:to="loc_nrg_LeaseholdRightsMember_1474706FC81D33401581CE222845D20E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SupplyCommitmentArrangementMember" xlink:label="loc_us-gaap_SupplyCommitmentArrangementMember_2EB3E49448C4EBC375C4CE22284572E9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_A923936952CBE55E18D2CE22284541FC" xlink:to="loc_us-gaap_SupplyCommitmentArrangementMember_2EB3E49448C4EBC375C4CE22284572E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_B9581F96F3133E8C1378CE2228455117" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_B293882B999BDDD2464BCE2227E749D9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_B9581F96F3133E8C1378CE2228455117" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DE80DF722D48BB42C1DCE222845418C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_B9581F96F3133E8C1378CE2228455117" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DE80DF722D48BB42C1DCE222845418C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DE80DF722D48BB42C1DCE222845418C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_B9581F96F3133E8C1378CE2228455117" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DE80DF722D48BB42C1DCE222845418C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindPortfolioMember" xlink:label="loc_nrg_AltaWindPortfolioMember_CBDE66FAEFB6689BEEE8CE2228458EC2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DE80DF722D48BB42C1DCE222845418C" xlink:to="loc_nrg_AltaWindPortfolioMember_CBDE66FAEFB6689BEEE8CE2228458EC2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_A0A466846B325B74D777CE22284573AE" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_B293882B999BDDD2464BCE2227E749D9" xlink:to="loc_us-gaap_StatementClassOfStockAxis_A0A466846B325B74D777CE22284573AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_D7561498C9FA0C144920CE2228451975_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_A0A466846B325B74D777CE22284573AE" xlink:to="loc_us-gaap_ClassOfStockDomain_D7561498C9FA0C144920CE2228451975_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_D7561498C9FA0C144920CE2228451975" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_A0A466846B325B74D777CE22284573AE" xlink:to="loc_us-gaap_ClassOfStockDomain_D7561498C9FA0C144920CE2228451975" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_DA50DFED4C5DB3F2D455CE22284500D5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_D7561498C9FA0C144920CE2228451975" xlink:to="loc_us-gaap_CommonClassAMember_DA50DFED4C5DB3F2D455CE22284500D5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_31D5A3DFA6F112F7486DCE2228454473" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_31D5A3DFA6F112F7486DCE2228454473" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NumberOfFacilities" xlink:label="loc_nrg_NumberOfFacilities_82A9516EFDFC084EAD56CE2228458ECD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_NumberOfFacilities_82A9516EFDFC084EAD56CE2228458ECD" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_1A3662C44CAB004E8005CE222845E15A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_1A3662C44CAB004E8005CE222845E15A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_2C978FAEB4B81A7D2DB6CE2228455301" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_2C978FAEB4B81A7D2DB6CE2228455301" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_C1DE6F87DB4F97E751E0CE2228458ECE" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_C1DE6F87DB4F97E751E0CE2228458ECE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital" xlink:label="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_B2DCA51FFB6E97D16A8CCE2228456BB1" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_B2DCA51FFB6E97D16A8CCE2228456BB1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_1E341E5232DD8EAE6A31CE2228452B1A" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_1E341E5232DD8EAE6A31CE2228452B1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_2B4022AAF9DAF279D31BCE2228453F67" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_SharePrice_2B4022AAF9DAF279D31BCE2228453F67" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_3AD8837EEF75129B8C26CE222845A591" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_3AD8837EEF75129B8C26CE222845A591" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_A02BDDE94C0D6A72C357CE2228457DB4" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_A02BDDE94C0D6A72C357CE2228457DB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_E54D24F369AEDB006DA2CE22284523E6" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_E54D24F369AEDB006DA2CE22284523E6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_14004D66F2AE1B96EBB0CE22284517C9" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_14004D66F2AE1B96EBB0CE22284517C9" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCash" xlink:label="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCash_93712A5E76E41FBDB962CE2228451F5E" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCash_93712A5E76E41FBDB962CE2228451F5E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentandNonCurrentAssets" xlink:label="loc_nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentandNonCurrentAssets_6F6AC36A5D31D20808FFCE222845E7EA" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentandNonCurrentAssets_6F6AC36A5D31D20808FFCE222845E7EA" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssets" xlink:label="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssets_D32ED97CC848672DC7A5CE2228450749" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssets_D32ED97CC848672DC7A5CE2228450749" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceAllocationOtherAssetsAdjusted" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceAllocationOtherAssetsAdjusted_8671B4092406A0565679CE222845D41A" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceAllocationOtherAssetsAdjusted_8671B4092406A0565679CE222845D41A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_5262F46DFCDBD0670EEBCE222845422D" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_5262F46DFCDBD0670EEBCE222845422D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment_6BFA4FCCA98CA80BD220CE2228453290" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment_6BFA4FCCA98CA80BD220CE2228453290" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceAllocationPropertyPlantandEquipmentAdjusted" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceAllocationPropertyPlantandEquipmentAdjusted_A7F1DAD843C6E92FD35FCE222845EC03" xlink:type="locator" />
    <definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceAllocationPropertyPlantandEquipmentAdjusted_A7F1DAD843C6E92FD35FCE222845EC03" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_996136341193BF5EBF2ECE2228452632" xlink:type="locator" />
    <definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_996136341193BF5EBF2ECE2228452632" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles_28E71F2E6FC3A67F768BCE222845827F" xlink:type="locator" />
    <definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles_28E71F2E6FC3A67F768BCE222845827F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherthanGoodwillAdjusted" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherthanGoodwillAdjusted_0E0ECEECADC557C258EDCE222845D69F" xlink:type="locator" />
    <definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherthanGoodwillAdjusted_0E0ECEECADC557C258EDCE222845D69F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_49CA08C69FE8C49EF9A7CE222845C388" xlink:type="locator" />
    <definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_49CA08C69FE8C49EF9A7CE222845C388" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalAssets" xlink:label="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalAssets_994170E9E716423E0B4ECE222845D357" xlink:type="locator" />
    <definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalAssets_994170E9E716423E0B4ECE222845D357" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredAdjusted" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredAdjusted_0836244DB80111E8762FCE2228459147" xlink:type="locator" />
    <definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredAdjusted_0836244DB80111E8762FCE2228459147" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_D4BC03FDD1E284F76482CE222845A224" xlink:type="locator" />
    <definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_D4BC03FDD1E284F76482CE222845A224" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesLongtermDebt" xlink:label="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesLongtermDebt_308ECC27B06B068A4367CE22284566C5" xlink:type="locator" />
    <definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNoncurrentLiabilitiesLongtermDebt_308ECC27B06B068A4367CE22284566C5" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceAllocationNoncurrentLiabilitiesLongtermDebtAdjusted" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceAllocationNoncurrentLiabilitiesLongtermDebtAdjusted_851A5955CC0D5B90A555CE222845A57D" xlink:type="locator" />
    <definitionArc order="28" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceAllocationNoncurrentLiabilitiesLongtermDebtAdjusted_851A5955CC0D5B90A555CE222845A57D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentandNonCurrentLiabilities" xlink:label="loc_nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentandNonCurrentLiabilities_6D3B6549B21EA2C482E8CE222845EFFC" xlink:type="locator" />
    <definitionArc order="29" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentandNonCurrentLiabilities_6D3B6549B21EA2C482E8CE222845EFFC" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentAndNoncurrentLiabilities" xlink:label="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentAndNoncurrentLiabilities_C9CCC919FC5D5E067B79CE2228459FE5" xlink:type="locator" />
    <definitionArc order="30" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentAndNoncurrentLiabilities_C9CCC919FC5D5E067B79CE2228459FE5" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceAllocationCurrentandNoncurrentLiabilitiesAdjusted" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceAllocationCurrentandNoncurrentLiabilitiesAdjusted_1A48BB62F9BE31073833CE2228450076" xlink:type="locator" />
    <definitionArc order="31" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceAllocationCurrentandNoncurrentLiabilitiesAdjusted_1A48BB62F9BE31073833CE2228450076" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_0E69741C9C2F4205EDFDCE2228455EB3" xlink:type="locator" />
    <definitionArc order="32" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_0E69741C9C2F4205EDFDCE2228455EB3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialLiabilities" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialLiabilities_7A18B7BBF6392B07415DCE22284520B4" xlink:type="locator" />
    <definitionArc order="33" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialLiabilities_7A18B7BBF6392B07415DCE22284520B4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumedAdjusted" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumedAdjusted_840EC356378B35076FD5CE222845C45F" xlink:type="locator" />
    <definitionArc order="34" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumedAdjusted_840EC356378B35076FD5CE222845C45F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_6AC4969E341543E2D334CE222845FBDB" xlink:type="locator" />
    <definitionArc order="35" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_6AC4969E341543E2D334CE222845FBDB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetAssetsAcquired" xlink:label="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetAssetsAcquired_82461591B6FF3B8E45E3CE22284585A2" xlink:type="locator" />
    <definitionArc order="36" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetAssetsAcquired_82461591B6FF3B8E45E3CE22284585A2" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAdjusted" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAdjusted_F60BE6956A835491036ECE2228457B79" xlink:type="locator" />
    <definitionArc order="37" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNetAdjusted_F60BE6956A835491036ECE2228457B79" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_62071315F531A4AC8DBDCE222845E221" xlink:type="locator" />
    <definitionArc order="38" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FECE9884ED886A09A042CE2228459253" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_62071315F531A4AC8DBDCE222845E221" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsDesertSunlightSpringCanyonfuelCellDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A3E4B148B989C3F0C392CE2228546C7F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A3E4B148B989C3F0C392CE2228546C7F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_AA3FFAC76BDBDAD0ECD0CE222854DF4C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A3E4B148B989C3F0C392CE2228546C7F" xlink:to="loc_us-gaap_CounterpartyNameAxis_AA3FFAC76BDBDAD0ECD0CE222854DF4C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_963EF1893413BA8C50B6CE222854F646_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CounterpartyNameAxis_AA3FFAC76BDBDAD0ECD0CE222854DF4C" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_963EF1893413BA8C50B6CE222854F646_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_963EF1893413BA8C50B6CE222854F646" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CounterpartyNameAxis_AA3FFAC76BDBDAD0ECD0CE222854DF4C" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_963EF1893413BA8C50B6CE222854F646" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SouthernCaliforniaEdisonMember" xlink:label="loc_nrg_SouthernCaliforniaEdisonMember_DD4486F3E035F78AC5EECE222854D16C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_963EF1893413BA8C50B6CE222854F646" xlink:to="loc_nrg_SouthernCaliforniaEdisonMember_DD4486F3E035F78AC5EECE222854D16C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PacificGasandElectricMember" xlink:label="loc_nrg_PacificGasandElectricMember_5F9BAC7E58B8BCE46F3FCE2228546D75" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_963EF1893413BA8C50B6CE222854F646" xlink:to="loc_nrg_PacificGasandElectricMember_5F9BAC7E58B8BCE46F3FCE2228546D75" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_8387C34770AC1BBA7690CE222854E652" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A3E4B148B989C3F0C392CE2228546C7F" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_8387C34770AC1BBA7690CE222854E652" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_749E41B8BE7948C4908DCE2228540993_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_8387C34770AC1BBA7690CE222854E652" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_749E41B8BE7948C4908DCE2228540993_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_749E41B8BE7948C4908DCE2228540993" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_8387C34770AC1BBA7690CE222854E652" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_749E41B8BE7948C4908DCE2228540993" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SupplyCommitmentArrangementMember" xlink:label="loc_us-gaap_SupplyCommitmentArrangementMember_B269C6702E547EF38551CE2228541B3E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_749E41B8BE7948C4908DCE2228540993" xlink:to="loc_us-gaap_SupplyCommitmentArrangementMember_B269C6702E547EF38551CE2228541B3E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_2CFD586CE0A4AD0C8FC5CE2228546907" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A3E4B148B989C3F0C392CE2228546C7F" xlink:to="loc_dei_LegalEntityAxis_2CFD586CE0A4AD0C8FC5CE2228546907" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_40387D74EA54180D7A2BCE222854F72A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_2CFD586CE0A4AD0C8FC5CE2228546907" xlink:to="loc_dei_EntityDomain_40387D74EA54180D7A2BCE222854F72A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_40387D74EA54180D7A2BCE222854F72A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_2CFD586CE0A4AD0C8FC5CE2228546907" xlink:to="loc_dei_EntityDomain_40387D74EA54180D7A2BCE222854F72A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_UBFuelCellMember" xlink:label="loc_nrg_UBFuelCellMember_CA095819405DC3C2086FCE22285409BE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_40387D74EA54180D7A2BCE222854F72A" xlink:to="loc_nrg_UBFuelCellMember_CA095819405DC3C2086FCE22285409BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_58273F32302E3CAD207BCE2228544A42" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A3E4B148B989C3F0C392CE2228546C7F" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_58273F32302E3CAD207BCE2228544A42" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_147751D92DE009ABE0CACE2228547029_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_58273F32302E3CAD207BCE2228544A42" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_147751D92DE009ABE0CACE2228547029_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_147751D92DE009ABE0CACE2228547029" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_58273F32302E3CAD207BCE2228544A42" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_147751D92DE009ABE0CACE2228547029" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DesertSunlightMember" xlink:label="loc_nrg_DesertSunlightMember_9ABE6DA6CE524C28EA52CE222854D2D4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_147751D92DE009ABE0CACE2228547029" xlink:to="loc_nrg_DesertSunlightMember_9ABE6DA6CE524C28EA52CE222854D2D4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesByTypeAxis" xlink:label="loc_nrg_PowerGenerationFacilitiesByTypeAxis_ED38B2520BE3868358D0CE2228543101" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A3E4B148B989C3F0C392CE2228546C7F" xlink:to="loc_nrg_PowerGenerationFacilitiesByTypeAxis_ED38B2520BE3868358D0CE2228543101" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_070584B662ECE3E7C10ECE222854466E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_ED38B2520BE3868358D0CE2228543101" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_070584B662ECE3E7C10ECE222854466E_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_070584B662ECE3E7C10ECE222854466E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_ED38B2520BE3868358D0CE2228543101" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_070584B662ECE3E7C10ECE222854466E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_UtilityScaleSolarMember" xlink:label="loc_nrg_UtilityScaleSolarMember_383DEC501EC397207C6ACE222854B394" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_070584B662ECE3E7C10ECE222854466E" xlink:to="loc_nrg_UtilityScaleSolarMember_383DEC501EC397207C6ACE222854B394" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WindFarmsMember" xlink:label="loc_nrg_WindFarmsMember_8336D01EA8AC8A0549D0CE2228540408" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_070584B662ECE3E7C10ECE222854466E" xlink:to="loc_nrg_WindFarmsMember_8336D01EA8AC8A0549D0CE2228540408" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ThermalMember" xlink:label="loc_nrg_ThermalMember_7C41A90771A18FECA9E9CE2228641CCB" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_070584B662ECE3E7C10ECE222854466E" xlink:to="loc_nrg_ThermalMember_7C41A90771A18FECA9E9CE2228641CCB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_C5F4F374DAE1CB26CA75CE222864A595" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A3E4B148B989C3F0C392CE2228546C7F" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_C5F4F374DAE1CB26CA75CE222864A595" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C19E48B00DF04703814CCE222864DF38_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_C5F4F374DAE1CB26CA75CE222864A595" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C19E48B00DF04703814CCE222864DF38_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C19E48B00DF04703814CCE222864DF38" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_C5F4F374DAE1CB26CA75CE222864A595" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C19E48B00DF04703814CCE222864DF38" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SpringCanyonMember" xlink:label="loc_nrg_SpringCanyonMember_D91DA2EBDF40AFBD7E9FCE222864622B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C19E48B00DF04703814CCE222864DF38" xlink:to="loc_nrg_SpringCanyonMember_D91DA2EBDF40AFBD7E9FCE222864622B" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SpringCanyonIIMember" xlink:label="loc_nrg_SpringCanyonIIMember_9A3BC961F82BCF5D01E8CE222864E44A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C19E48B00DF04703814CCE222864DF38" xlink:to="loc_nrg_SpringCanyonIIMember_9A3BC961F82BCF5D01E8CE222864E44A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SpringCanyonIIIMember" xlink:label="loc_nrg_SpringCanyonIIIMember_628B76706F5DEA828B29CE2228649EF6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C19E48B00DF04703814CCE222864DF38" xlink:to="loc_nrg_SpringCanyonIIIMember_628B76706F5DEA828B29CE2228649EF6" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_UBFuelCellMember" xlink:label="loc_nrg_UBFuelCellMember_A980524AC75F4F5ACCA6CE222864D54D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C19E48B00DF04703814CCE222864DF38" xlink:to="loc_nrg_UBFuelCellMember_A980524AC75F4F5ACCA6CE222864D54D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PercentageOfOwnership" xlink:label="loc_nrg_PercentageOfOwnership_BC7C683FB18291A8A424CE22286429E8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:to="loc_nrg_PercentageOfOwnership_BC7C683FB18291A8A424CE22286429E8" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NumberOfFacilities" xlink:label="loc_nrg_NumberOfFacilities_2E6BD73CDBB21A14EAB9CE2228643733" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:to="loc_nrg_NumberOfFacilities_2E6BD73CDBB21A14EAB9CE2228643733" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_CC8FB91E34800383128BCE222864BBF7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_CC8FB91E34800383128BCE222864BBF7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_476B5E8E50C34BAE5E92CE2228640BE3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_476B5E8E50C34BAE5E92CE2228640BE3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_1FFA10511B6026B2BBD2CEA2DADE2B45" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_1FFA10511B6026B2BBD2CEA2DADE2B45" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_E47B035DFB29FC5C3080CE222864B521" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_E47B035DFB29FC5C3080CE222864B521" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_36865EA214FEF20EC4F0CE222864BD50" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_C8D7114E8E8E06F785DBCE2228645D11" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_36865EA214FEF20EC4F0CE222864BD50" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsJanuary2015DropDownsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_751599DE6700D32CF9E4CE22285404C8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_751599DE6700D32CF9E4CE22285404C8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_61077E6AE6F829ED5822CE2228548207" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_751599DE6700D32CF9E4CE22285404C8" xlink:to="loc_us-gaap_StatementScenarioAxis_61077E6AE6F829ED5822CE2228548207" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_38AF4DBAA703FBFE3BBBCE2228545C6A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_61077E6AE6F829ED5822CE2228548207" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_38AF4DBAA703FBFE3BBBCE2228545C6A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_38AF4DBAA703FBFE3BBBCE2228545C6A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_61077E6AE6F829ED5822CE2228548207" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_38AF4DBAA703FBFE3BBBCE2228545C6A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioPreviouslyReportedMember" xlink:label="loc_us-gaap_ScenarioPreviouslyReportedMember_7BB6B92E4AB00808B912CE2228541824" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_38AF4DBAA703FBFE3BBBCE2228545C6A" xlink:to="loc_us-gaap_ScenarioPreviouslyReportedMember_7BB6B92E4AB00808B912CE2228541824" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_F11304A976CE92217FC6CE2228549DB9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_751599DE6700D32CF9E4CE22285404C8" xlink:to="loc_dei_LegalEntityAxis_F11304A976CE92217FC6CE2228549DB9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_F11304A976CE92217FC6CE2228549DB9" xlink:to="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_F11304A976CE92217FC6CE2228549DB9" xlink:to="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LaredoRidgeMember" xlink:label="loc_nrg_LaredoRidgeMember_94DE5C5BD95DA7B89680CE2228545F86" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36" xlink:to="loc_nrg_LaredoRidgeMember_94DE5C5BD95DA7B89680CE2228545F86" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BuffaloBearMember" xlink:label="loc_nrg_BuffaloBearMember_766130BF0575DFF840F8CE2228547E2F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36" xlink:to="loc_nrg_BuffaloBearMember_766130BF0575DFF840F8CE2228547E2F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TalogaMember" xlink:label="loc_nrg_TalogaMember_9FAAC311FED261321C30CE222854E0B5" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36" xlink:to="loc_nrg_TalogaMember_9FAAC311FED261321C30CE222854E0B5" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PinnacleMember" xlink:label="loc_nrg_PinnacleMember_089491135474EF559A31CE222854C3D1" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36" xlink:to="loc_nrg_PinnacleMember_089491135474EF559A31CE222854C3D1" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WalnutCreekMember" xlink:label="loc_nrg_WalnutCreekMember_33C376BA500CB0170039CE222854B037" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4498DDEDEDA02DD16AA2CE222854CA36" xlink:to="loc_nrg_WalnutCreekMember_33C376BA500CB0170039CE222854B037" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesByTypeAxis" xlink:label="loc_nrg_PowerGenerationFacilitiesByTypeAxis_97011E34004526229343CE222854B852" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_751599DE6700D32CF9E4CE22285404C8" xlink:to="loc_nrg_PowerGenerationFacilitiesByTypeAxis_97011E34004526229343CE222854B852" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_FF0BD46CE19434B37243CE2228544142_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_97011E34004526229343CE222854B852" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_FF0BD46CE19434B37243CE2228544142_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_FF0BD46CE19434B37243CE2228544142" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_97011E34004526229343CE222854B852" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_FF0BD46CE19434B37243CE2228544142" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WindFarmsMember" xlink:label="loc_nrg_WindFarmsMember_66F904C90E1F082705AFCE2228542608" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_FF0BD46CE19434B37243CE2228544142" xlink:to="loc_nrg_WindFarmsMember_66F904C90E1F082705AFCE2228542608" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ConventionalGenerationMember" xlink:label="loc_nrg_ConventionalGenerationMember_7B83B47488FE4C146A22CE2228546899" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_FF0BD46CE19434B37243CE2228544142" xlink:to="loc_nrg_ConventionalGenerationMember_7B83B47488FE4C146A22CE2228546899" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_F87CE5A6E1138A453D8ACE2228540BFA" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_751599DE6700D32CF9E4CE22285404C8" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_F87CE5A6E1138A453D8ACE2228540BFA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3548C29021B65614E11CE222854F477_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_F87CE5A6E1138A453D8ACE2228540BFA" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3548C29021B65614E11CE222854F477_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3548C29021B65614E11CE222854F477" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_F87CE5A6E1138A453D8ACE2228540BFA" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3548C29021B65614E11CE222854F477" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_January2015DropDownAssetsMember" xlink:label="loc_nrg_January2015DropDownAssetsMember_6AD2DBCD78E59428D7DACE222854ED75" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3548C29021B65614E11CE222854F477" xlink:to="loc_nrg_January2015DropDownAssetsMember_6AD2DBCD78E59428D7DACE222854ED75" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TapestryWindMember" xlink:label="loc_nrg_TapestryWindMember_D5B300D31EF6FF35AEF3CE222854D1C2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3548C29021B65614E11CE222854F477" xlink:to="loc_nrg_TapestryWindMember_D5B300D31EF6FF35AEF3CE222854D1C2" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WalnutCreekMember" xlink:label="loc_nrg_WalnutCreekMember_27AFC16C4820305F789CCE222854466B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3548C29021B65614E11CE222854F477" xlink:to="loc_nrg_WalnutCreekMember_27AFC16C4820305F789CCE222854466B" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LaredoRidgeMember" xlink:label="loc_nrg_LaredoRidgeMember_1647E9C1F284B870E7E1CE222854125B" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C3548C29021B65614E11CE222854F477" xlink:to="loc_nrg_LaredoRidgeMember_1647E9C1F284B870E7E1CE222854125B" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_E507CB1E2FEE786C3E4ACE2228541F6A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_E507CB1E2FEE786C3E4ACE2228541F6A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_95CE1EB000CF7F787192CE222854DA0D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_95CE1EB000CF7F787192CE222854DA0D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital" xlink:label="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_F027728B66BBFF50E6CBCE2228548399" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_F027728B66BBFF50E6CBCE2228548399" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_A84D5686A0D242D02741CE222854630C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_A84D5686A0D242D02741CE222854630C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses_21BE2B9264F543ED582FCE2228543E49" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses_21BE2B9264F543ED582FCE2228543E49" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1_3FC9324DD1FA3D329638CE222854445D" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1_3FC9324DD1FA3D329638CE222854445D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_1B614057B2D03752DFD7CE22285439C3" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_AssetsCurrent_1B614057B2D03752DFD7CE22285439C3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_8C81466F651B21B0932FCE2228548AFA" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_8C81466F651B21B0932FCE2228548AFA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaap_AssetsNoncurrent_ABD17816F0AD67F927EDCE222854999E" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_AssetsNoncurrent_ABD17816F0AD67F927EDCE222854999E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_02F8AA52AADE7F9710C2CE222854620C" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_Assets_02F8AA52AADE7F9710C2CE222854620C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_81781851FFC42583311FCE222854ED38" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_LongTermDebt_81781851FFC42583311FCE222854ED38" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilities" xlink:label="loc_us-gaap_OtherLiabilities_EFAF9C14E658F054CD02CE2228543709" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_OtherLiabilities_EFAF9C14E658F054CD02CE2228543709" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_6CF29D87E2AA28D0443ACE2228543B63" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_Liabilities_6CF29D87E2AA28D0443ACE2228543B63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsNet" xlink:label="loc_us-gaap_AssetsNet_8E3BD7970C6FBCADEF1ECE2228545CBB" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_AssetsNet_8E3BD7970C6FBCADEF1ECE2228545CBB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_20B3AA390CA378F42F32CE222854C6DE" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_20B3AA390CA378F42F32CE222854C6DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_91403078564CBDDF4512CE222854DC57" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_91403078564CBDDF4512CE222854DC57" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets_5B94343886D0CE71C2B0CE222854F212" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets_5B94343886D0CE71C2B0CE222854F212" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_EE2B6BA66591D0129646CE22285495F7" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_EE2B6BA66591D0129646CE22285495F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_77329C5592B18C83FBACCE222854B74A" xlink:type="locator" />
    <definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_77329C5592B18C83FBACCE222854B74A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherCurrentandNonCurrentLiabilities" xlink:label="loc_nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherCurrentandNonCurrentLiabilities_8D4317B505E5463D39DCCE222854FE6F" xlink:type="locator" />
    <definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherCurrentandNonCurrentLiabilities_8D4317B505E5463D39DCCE222854FE6F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_BD2BED3BCA0ACA7618E8CE2228540B16" xlink:type="locator" />
    <definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_BD2BED3BCA0ACA7618E8CE2228540B16" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_3FBD58C34729ACCFFA51CE222854C6CA" xlink:type="locator" />
    <definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_3FBD58C34729ACCFFA51CE222854C6CA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_4FA5585D5D2C89BBB510CE222854EC5C" xlink:type="locator" />
    <definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_4FA5585D5D2C89BBB510CE222854EC5C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionProFormaNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest" xlink:label="loc_nrg_BusinessAcquisitionProFormaNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest_F959EF5D224F8A5E5273CE2228540C0D" xlink:type="locator" />
    <definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_nrg_BusinessAcquisitionProFormaNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest_F959EF5D224F8A5E5273CE2228540C0D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_5CF561973908CBFF137BCE2228548AAD" xlink:type="locator" />
    <definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_5CF561973908CBFF137BCE2228548AAD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_451FC97A33EEA1836DC5CE222854E6EC" xlink:type="locator" />
    <definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_55CE5BD94B949E0DE124CE2228548779" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_451FC97A33EEA1836DC5CE222854E6EC" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsJune2014DropDownsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_CCD0F24A0B1D1077A9CFAEA523D40A5A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8611A7FCB47E7E66D8D4AEA523D3D781" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_CCD0F24A0B1D1077A9CFAEA523D40A5A" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8611A7FCB47E7E66D8D4AEA523D3D781" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_0BCF243916F0ED39586DAEA546AE37EC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8611A7FCB47E7E66D8D4AEA523D3D781" xlink:to="loc_dei_LegalEntityAxis_0BCF243916F0ED39586DAEA546AE37EC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_BBE537101AB6287DD4C9AEA54790AE77_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0BCF243916F0ED39586DAEA546AE37EC" xlink:to="loc_dei_EntityDomain_BBE537101AB6287DD4C9AEA54790AE77_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_BBE537101AB6287DD4C9AEA54790AE77" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0BCF243916F0ED39586DAEA546AE37EC" xlink:to="loc_dei_EntityDomain_BBE537101AB6287DD4C9AEA54790AE77" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ElSegundoMember" xlink:label="loc_nrg_ElSegundoMember_56532010D851B969621BAEA5482DE126" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BBE537101AB6287DD4C9AEA54790AE77" xlink:to="loc_nrg_ElSegundoMember_56532010D851B969621BAEA5482DE126" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaHighDesertLlcMember" xlink:label="loc_nrg_TaHighDesertLlcMember_7644FD3EFDFF5A74F401AEA54A0E2BFE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BBE537101AB6287DD4C9AEA54790AE77" xlink:to="loc_nrg_TaHighDesertLlcMember_7644FD3EFDFF5A74F401AEA54A0E2BFE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_KansasSouthMember" xlink:label="loc_nrg_KansasSouthMember_70617A7144FE5CC18903AEA54BCB18D5" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_BBE537101AB6287DD4C9AEA54790AE77" xlink:to="loc_nrg_KansasSouthMember_70617A7144FE5CC18903AEA54BCB18D5" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesByTypeAxis" xlink:label="loc_nrg_PowerGenerationFacilitiesByTypeAxis_79D469A1B6410832ADA5AEA546179D67" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8611A7FCB47E7E66D8D4AEA523D3D781" xlink:to="loc_nrg_PowerGenerationFacilitiesByTypeAxis_79D469A1B6410832ADA5AEA546179D67" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_A03CD1392C4E7474D85CAEA5473C0E41_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_79D469A1B6410832ADA5AEA546179D67" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_A03CD1392C4E7474D85CAEA5473C0E41_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_A03CD1392C4E7474D85CAEA5473C0E41" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_79D469A1B6410832ADA5AEA546179D67" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_A03CD1392C4E7474D85CAEA5473C0E41" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ConventionalGenerationMember" xlink:label="loc_nrg_ConventionalGenerationMember_D6212BCE84AFB0D40810AEA54932A4BE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_A03CD1392C4E7474D85CAEA5473C0E41" xlink:to="loc_nrg_ConventionalGenerationMember_D6212BCE84AFB0D40810AEA54932A4BE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_UtilityScaleSolarMember" xlink:label="loc_nrg_UtilityScaleSolarMember_216A114B2F654BC1E4E9AEA54ABA55EC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_A03CD1392C4E7474D85CAEA5473C0E41" xlink:to="loc_nrg_UtilityScaleSolarMember_216A114B2F654BC1E4E9AEA54ABA55EC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5742113EB569B81D2981AEA523D361BE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8611A7FCB47E7E66D8D4AEA523D3D781" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5742113EB569B81D2981AEA523D361BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4C85824269C184E71E9EAEA523D3BE7D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5742113EB569B81D2981AEA523D361BE" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4C85824269C184E71E9EAEA523D3BE7D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4C85824269C184E71E9EAEA523D3BE7D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5742113EB569B81D2981AEA523D361BE" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4C85824269C184E71E9EAEA523D3BE7D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_June2014DropDownAssetsMember" xlink:label="loc_nrg_June2014DropDownAssetsMember_57310522DF7D4201CB56AEA523D3BBEB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4C85824269C184E71E9EAEA523D3BE7D" xlink:to="loc_nrg_June2014DropDownAssetsMember_57310522DF7D4201CB56AEA523D3BBEB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_A266D9A9AC5BE5C06DDCAEA523D35A87" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8611A7FCB47E7E66D8D4AEA523D3D781" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_A266D9A9AC5BE5C06DDCAEA523D35A87" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_12351327636C51A28E81AEA523D40A21_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_A266D9A9AC5BE5C06DDCAEA523D35A87" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_12351327636C51A28E81AEA523D40A21_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_12351327636C51A28E81AEA523D40A21" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_A266D9A9AC5BE5C06DDCAEA523D35A87" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_12351327636C51A28E81AEA523D40A21" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_18102082AC119DDDAB69AEA523D44487" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_8611A7FCB47E7E66D8D4AEA523D3D781" xlink:to="loc_us-gaap_StatementClassOfStockAxis_18102082AC119DDDAB69AEA523D44487" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_163A719991F87BFEC8F2AEA523D4CACE_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_18102082AC119DDDAB69AEA523D44487" xlink:to="loc_us-gaap_ClassOfStockDomain_163A719991F87BFEC8F2AEA523D4CACE_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_163A719991F87BFEC8F2AEA523D4CACE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_18102082AC119DDDAB69AEA523D44487" xlink:to="loc_us-gaap_ClassOfStockDomain_163A719991F87BFEC8F2AEA523D4CACE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_DE8360F7953D349D8BAFAEA5436F40AE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_CCD0F24A0B1D1077A9CFAEA523D40A5A" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_DE8360F7953D349D8BAFAEA5436F40AE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_D4225567572B88B8642DAEA523D44167" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_CCD0F24A0B1D1077A9CFAEA523D40A5A" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_D4225567572B88B8642DAEA523D44167" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionsConsiderationTransferredPurchasePrice" xlink:label="loc_nrg_BusinessAcquisitionsConsiderationTransferredPurchasePrice_74E35A897C67AAB3E1B1AEA523D475ED" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_CCD0F24A0B1D1077A9CFAEA523D40A5A" xlink:to="loc_nrg_BusinessAcquisitionsConsiderationTransferredPurchasePrice_74E35A897C67AAB3E1B1AEA523D475ED" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital" xlink:label="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_C54E2AE427C80972069CAEA523D4753A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_CCD0F24A0B1D1077A9CFAEA523D40A5A" xlink:to="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_C54E2AE427C80972069CAEA523D4753A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_E3E6BEF94E98790F3CBDAEA523D48261" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_CCD0F24A0B1D1077A9CFAEA523D40A5A" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_E3E6BEF94E98790F3CBDAEA523D48261" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsNovember2015DropDownDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A5E47C38427ACC69A71ACE2228648AC1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A5E47C38427ACC69A71ACE2228648AC1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesByTypeAxis" xlink:label="loc_nrg_PowerGenerationFacilitiesByTypeAxis_01F609B146C6AB9102B1CE222864832A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A5E47C38427ACC69A71ACE2228648AC1" xlink:to="loc_nrg_PowerGenerationFacilitiesByTypeAxis_01F609B146C6AB9102B1CE222864832A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_D320CA93DB9B47B1C40BCE222864186D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_01F609B146C6AB9102B1CE222864832A" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_D320CA93DB9B47B1C40BCE222864186D_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_D320CA93DB9B47B1C40BCE222864186D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_01F609B146C6AB9102B1CE222864832A" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_D320CA93DB9B47B1C40BCE222864186D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WindFarmsMember" xlink:label="loc_nrg_WindFarmsMember_C79060311AB6606740FBCE222864FD3E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_D320CA93DB9B47B1C40BCE222864186D" xlink:to="loc_nrg_WindFarmsMember_C79060311AB6606740FBCE222864FD3E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_2D28A086E9954BCDC8DDCE2228640FF0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A5E47C38427ACC69A71ACE2228648AC1" xlink:to="loc_dei_LegalEntityAxis_2D28A086E9954BCDC8DDCE2228640FF0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2A8DBACCC6D292A61260CE22286469A4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_2D28A086E9954BCDC8DDCE2228640FF0" xlink:to="loc_dei_EntityDomain_2A8DBACCC6D292A61260CE22286469A4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2A8DBACCC6D292A61260CE22286469A4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_2D28A086E9954BCDC8DDCE2228640FF0" xlink:to="loc_dei_EntityDomain_2A8DBACCC6D292A61260CE22286469A4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PeriodAxis" xlink:label="loc_nrg_PeriodAxis_16D54294AE6818E44D45CE222864F479" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A5E47C38427ACC69A71ACE2228648AC1" xlink:to="loc_nrg_PeriodAxis_16D54294AE6818E44D45CE222864F479" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PeriodDomain" xlink:label="loc_nrg_PeriodDomain_349CB524C29A6BC4CEBDCE222864BD56_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PeriodAxis_16D54294AE6818E44D45CE222864F479" xlink:to="loc_nrg_PeriodDomain_349CB524C29A6BC4CEBDCE222864BD56_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PeriodDomain" xlink:label="loc_nrg_PeriodDomain_349CB524C29A6BC4CEBDCE222864BD56" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PeriodAxis_16D54294AE6818E44D45CE222864F479" xlink:to="loc_nrg_PeriodDomain_349CB524C29A6BC4CEBDCE222864BD56" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PostFlipPointMember" xlink:label="loc_nrg_PostFlipPointMember_F517E2A357EA0573A3BDCE222864E127" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PeriodDomain_349CB524C29A6BC4CEBDCE222864BD56" xlink:to="loc_nrg_PostFlipPointMember_F517E2A357EA0573A3BDCE222864E127" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PreFlipPointMember" xlink:label="loc_nrg_PreFlipPointMember_53435625551632A92066CE222864E502" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PeriodDomain_349CB524C29A6BC4CEBDCE222864BD56" xlink:to="loc_nrg_PreFlipPointMember_53435625551632A92066CE222864E502" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PredeterminedDateThroughFlipPointIfFlipHasNotOccuredMember" xlink:label="loc_nrg_PredeterminedDateThroughFlipPointIfFlipHasNotOccuredMember_ED1C780267077C37C36BCE2228649D2A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PeriodDomain_349CB524C29A6BC4CEBDCE222864BD56" xlink:to="loc_nrg_PredeterminedDateThroughFlipPointIfFlipHasNotOccuredMember_ED1C780267077C37C36BCE2228649D2A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsByNameAxis" xlink:label="loc_us-gaap_OtherOwnershipInterestsByNameAxis_4B648F91B1566D8A4846CE2228642A6E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A5E47C38427ACC69A71ACE2228648AC1" xlink:to="loc_us-gaap_OtherOwnershipInterestsByNameAxis_4B648F91B1566D8A4846CE2228642A6E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsNameDomain" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_FA0BBD3D62634D7B6AE1CE2228649940_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_4B648F91B1566D8A4846CE2228642A6E" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_FA0BBD3D62634D7B6AE1CE2228649940_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsNameDomain" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_FA0BBD3D62634D7B6AE1CE2228649940" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_4B648F91B1566D8A4846CE2228642A6E" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_FA0BBD3D62634D7B6AE1CE2228649940" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_FinancialInstitutionsMember" xlink:label="loc_nrg_FinancialInstitutionsMember_D44A78DAE8B71C7A251CCE2228640CEA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherOwnershipInterestsNameDomain_FA0BBD3D62634D7B6AE1CE2228649940" xlink:to="loc_nrg_FinancialInstitutionsMember_D44A78DAE8B71C7A251CCE2228640CEA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_864288BAEC8C8B1EA60DCE2228641835" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A5E47C38427ACC69A71ACE2228648AC1" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_864288BAEC8C8B1EA60DCE2228641835" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_95C006D9DE71ECBD92B2CE22286447A2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_864288BAEC8C8B1EA60DCE2228641835" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_95C006D9DE71ECBD92B2CE22286447A2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_95C006D9DE71ECBD92B2CE22286447A2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_864288BAEC8C8B1EA60DCE2228641835" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_95C006D9DE71ECBD92B2CE22286447A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_9997345ADA482030CC94CE2228640B70" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_95C006D9DE71ECBD92B2CE22286447A2" xlink:to="loc_us-gaap_SubsequentEventMember_9997345ADA482030CC94CE2228640B70" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5100014DD05DD8EBE6B1CE222864BFAD" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A5E47C38427ACC69A71ACE2228648AC1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5100014DD05DD8EBE6B1CE222864BFAD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24F10ABD3562FDE432E8CE222864CAEB_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5100014DD05DD8EBE6B1CE222864BFAD" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24F10ABD3562FDE432E8CE222864CAEB_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24F10ABD3562FDE432E8CE222864CAEB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5100014DD05DD8EBE6B1CE222864BFAD" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24F10ABD3562FDE432E8CE222864CAEB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_November2015DropDownAssetsMember" xlink:label="loc_nrg_November2015DropDownAssetsMember_6336F92963BD69DF9E59CE222864555E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24F10ABD3562FDE432E8CE222864CAEB" xlink:to="loc_nrg_November2015DropDownAssetsMember_6336F92963BD69DF9E59CE222864555E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PercentageofCashAvailableforDistributions" xlink:label="loc_nrg_PercentageofCashAvailableforDistributions_0998ED979AD3C474CBD6CE2228641D70" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_nrg_PercentageofCashAvailableforDistributions_0998ED979AD3C474CBD6CE2228641D70" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_FFFBD65F34B46DCA6297CE222864EFDC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_FFFBD65F34B46DCA6297CE222864EFDC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_FC377141A76E12219E73CE2228645EF3" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_FC377141A76E12219E73CE2228645EF3" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital" xlink:label="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_8758DA95F9466C9471F3CE2228648FD4" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_8758DA95F9466C9471F3CE2228648FD4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_9D557D7EA0E4483213F2CE2228648478" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_9D557D7EA0E4483213F2CE2228648478" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses_B129338D28437038D71ECE22286447D2" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses_B129338D28437038D71ECE22286447D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_0EC168A337170A305BA6CE222864BD85" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_0EC168A337170A305BA6CE222864BD85" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_96F2FC4A527260942383CE222864B659" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_96F2FC4A527260942383CE222864B659" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets_858F9963270832E1A3BECE2228649640" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets_858F9963270832E1A3BECE2228649640" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_683959E6B32E5C3584D4CE2228647548" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_683959E6B32E5C3584D4CE2228647548" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_95D8BA67848ABE9D52DECE2228644306" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_95D8BA67848ABE9D52DECE2228644306" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherCurrentandNonCurrentLiabilities" xlink:label="loc_nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherCurrentandNonCurrentLiabilities_A97006434801A24F194ECE2228647A69" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_nrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherCurrentandNonCurrentLiabilities_A97006434801A24F194ECE2228647A69" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_22678C8458B6EBB182F7CE2228642291" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_22678C8458B6EBB182F7CE2228642291" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_5DCF5B82BFEE7F338740CE2228647338" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_5DCF5B82BFEE7F338740CE2228647338" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_DA48B4221DBDC2B0BA3ECE2228643C87" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_DA48B4221DBDC2B0BA3ECE2228643C87" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_B9C0AF4F02FFB8E938A9CE2228649719" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_B9C0AF4F02FFB8E938A9CE2228649719" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionProFormaNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest" xlink:label="loc_nrg_BusinessAcquisitionProFormaNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest_BD6856DE8EE688CDA4AFCE222864437E" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_nrg_BusinessAcquisitionProFormaNetIncomeLossIncludingPortionAttributabletoNoncontrollingInterest_BD6856DE8EE688CDA4AFCE222864437E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaxableIncomeAllocationPreFlip" xlink:label="loc_nrg_TaxableIncomeAllocationPreFlip_EC8ABF0114E4F3E34F08CE22286440E4" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_nrg_TaxableIncomeAllocationPreFlip_EC8ABF0114E4F3E34F08CE22286440E4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaxableIncomeAllocationPostFlip" xlink:label="loc_nrg_TaxableIncomeAllocationPostFlip_8ECA099C0F72C834FB29CE222864A1F7" xlink:type="locator" />
    <definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_nrg_TaxableIncomeAllocationPostFlip_8ECA099C0F72C834FB29CE222864A1F7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NumberOfFacilities" xlink:label="loc_nrg_NumberOfFacilities_F71DDB3DA4CA7BBE5CB6CE222864B94D" xlink:type="locator" />
    <definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_nrg_NumberOfFacilities_F71DDB3DA4CA7BBE5CB6CE222864B94D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_53D43F42B0064E64E757CE2228646B4C" xlink:type="locator" />
    <definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_A9831B637FBD602B144ECE222864861F" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_53D43F42B0064E64E757CE2228646B4C" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/BusinessAcquisitionsBusinessAcquisitionsTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_3F662F6998D9D5C7C21DCE222864898C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_78D64AF9246508E8189ECE222864E0ED" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3F662F6998D9D5C7C21DCE222864898C" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_78D64AF9246508E8189ECE222864E0ED" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_6377E7E67657C24D676BCE222864BC1E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_78D64AF9246508E8189ECE222864E0ED" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_6377E7E67657C24D676BCE222864BC1E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CB6D10F9BA290CB36BFACE222864122E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6377E7E67657C24D676BCE222864BC1E" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CB6D10F9BA290CB36BFACE222864122E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CB6D10F9BA290CB36BFACE222864122E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6377E7E67657C24D676BCE222864BC1E" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CB6D10F9BA290CB36BFACE222864122E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_November2015DropDownAssetsMember" xlink:label="loc_nrg_November2015DropDownAssetsMember_87DA6D44DDD53D1B6FB8CE22286479AE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CB6D10F9BA290CB36BFACE222864122E" xlink:to="loc_nrg_November2015DropDownAssetsMember_87DA6D44DDD53D1B6FB8CE22286479AE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_January2015DropDownAssetsMember" xlink:label="loc_nrg_January2015DropDownAssetsMember_12841C3D4E55DEFBA922CE22286440D4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CB6D10F9BA290CB36BFACE222864122E" xlink:to="loc_nrg_January2015DropDownAssetsMember_12841C3D4E55DEFBA922CE22286440D4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindPortfolioMember" xlink:label="loc_nrg_AltaWindPortfolioMember_DEEF00D6FE3AD31D4E96CE9C69714058" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_CB6D10F9BA290CB36BFACE222864122E" xlink:to="loc_nrg_AltaWindPortfolioMember_DEEF00D6FE3AD31D4E96CE9C69714058" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_A45EA9730273F3EFA7C8CE222873C0C9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3F662F6998D9D5C7C21DCE222864898C" xlink:to="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_A45EA9730273F3EFA7C8CE222873C0C9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_51DFE69BA321325FECA9CE222873D792" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3F662F6998D9D5C7C21DCE222864898C" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_51DFE69BA321325FECA9CE222873D792" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionPurchasePriceTableTextBlock" xlink:label="loc_nrg_BusinessAcquisitionPurchasePriceTableTextBlock_C54B512C5395C7D0810DCE222873A28F" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3F662F6998D9D5C7C21DCE222864898C" xlink:to="loc_nrg_BusinessAcquisitionPurchasePriceTableTextBlock_C54B512C5395C7D0810DCE222873A28F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructure" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructureChangesInCapitalStructureDividendsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPayableLineItems" xlink:label="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPayableTable" xlink:label="loc_us-gaap_DividendsPayableTable_57D811F602F2FD36B5FEAE85BA146E9F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_DividendsPayableTable_57D811F602F2FD36B5FEAE85BA146E9F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_680E4F6F73D764AB6126AE85BA15C82C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DividendsPayableTable_57D811F602F2FD36B5FEAE85BA146E9F" xlink:to="loc_us-gaap_StatementClassOfStockAxis_680E4F6F73D764AB6126AE85BA15C82C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_AC44D5A0F4D1A024D2BDAE85BA15CC36_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_680E4F6F73D764AB6126AE85BA15C82C" xlink:to="loc_us-gaap_ClassOfStockDomain_AC44D5A0F4D1A024D2BDAE85BA15CC36_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_AC44D5A0F4D1A024D2BDAE85BA15CC36" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_680E4F6F73D764AB6126AE85BA15C82C" xlink:to="loc_us-gaap_ClassOfStockDomain_AC44D5A0F4D1A024D2BDAE85BA15CC36" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_482DB5B803165A48D2ADAE85BA16F3BD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_AC44D5A0F4D1A024D2BDAE85BA15CC36" xlink:to="loc_us-gaap_CommonClassAMember_482DB5B803165A48D2ADAE85BA16F3BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_D641CE21601444D12488AE85BA17134F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_D641CE21601444D12488AE85BA17134F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPayableDateDeclaredDayMonthAndYear" xlink:label="loc_us-gaap_DividendsPayableDateDeclaredDayMonthAndYear_1E0AB0724BE8311F4478AE85BA176CBD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_DividendsPayableDateDeclaredDayMonthAndYear_1E0AB0724BE8311F4478AE85BA176CBD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_5B578AA9BD2CCAC0D4A3AE85BA1868E3" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_5B578AA9BD2CCAC0D4A3AE85BA1868E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendPayableDateToBePaidDayMonthAndYear" xlink:label="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_E554709BAA3B56F97A60AE85BA18CA84" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_E554709BAA3B56F97A60AE85BA18CA84" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPayableDateOfRecordDayMonthAndYear" xlink:label="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_CF42DED1EDE0355F3990AE85BA19FF6B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_CF42DED1EDE0355F3990AE85BA19FF6B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_928DF4ADF6E0752821C3AE85BA1941EE" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_928DF4ADF6E0752821C3AE85BA1941EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_C251BAFE8DD7E8484E7DAE85BA1993F4" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_C251BAFE8DD7E8484E7DAE85BA1993F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_A1FCCD0B6D298CC6FDD4AE85BA1AFEEA" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_5B2FA68BF25D33D2106BAE85BA179EEA" xlink:to="loc_us-gaap_PreferredStockValue_A1FCCD0B6D298CC6FDD4AE85BA1AFEEA" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructureChangesInCapitalStructureRecapitalizationAndStockIssuanceDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfCapitalizationEquityLineItems" xlink:label="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfCapitalizationEquityTable" xlink:label="loc_us-gaap_ScheduleOfCapitalizationEquityTable_3C3F449560E854C93A59AEF69FEE1063" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_ScheduleOfCapitalizationEquityTable_3C3F449560E854C93A59AEF69FEE1063" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_1126DE03F56C6BBD1621AEF69FEE5202" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityTable_3C3F449560E854C93A59AEF69FEE1063" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_1126DE03F56C6BBD1621AEF69FEE5202" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9C60DE6A4DEFCAB00B14AEF69FEEF169_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_1126DE03F56C6BBD1621AEF69FEE5202" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9C60DE6A4DEFCAB00B14AEF69FEEF169_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9C60DE6A4DEFCAB00B14AEF69FEEF169" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_1126DE03F56C6BBD1621AEF69FEE5202" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9C60DE6A4DEFCAB00B14AEF69FEEF169" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OverAllotmentOptionMember" xlink:label="loc_us-gaap_OverAllotmentOptionMember_4A351E55976ED128C447AEF69FEE4FAF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9C60DE6A4DEFCAB00B14AEF69FEEF169" xlink:to="loc_us-gaap_OverAllotmentOptionMember_4A351E55976ED128C447AEF69FEE4FAF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_22F03AB29500C1C5F8A7AEF69FEE78F3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityTable_3C3F449560E854C93A59AEF69FEE1063" xlink:to="loc_us-gaap_CounterpartyNameAxis_22F03AB29500C1C5F8A7AEF69FEE78F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_66EB40FEBA8AE2BDF4A2AEF69FF316CF_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CounterpartyNameAxis_22F03AB29500C1C5F8A7AEF69FEE78F3" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_66EB40FEBA8AE2BDF4A2AEF69FF316CF_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_66EB40FEBA8AE2BDF4A2AEF69FF316CF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CounterpartyNameAxis_22F03AB29500C1C5F8A7AEF69FEE78F3" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_66EB40FEBA8AE2BDF4A2AEF69FF316CF" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldMember" xlink:label="loc_nrg_NRGYieldMember_89F47CF0FCEC53AF01BDAEF864C1BF88" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_66EB40FEBA8AE2BDF4A2AEF69FF316CF" xlink:to="loc_nrg_NRGYieldMember_89F47CF0FCEC53AF01BDAEF864C1BF88" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgMember" xlink:label="loc_nrg_NrgMember_0BBB374CE719E2A8F1BCAEF69FF3A174" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_66EB40FEBA8AE2BDF4A2AEF69FF316CF" xlink:to="loc_nrg_NrgMember_0BBB374CE719E2A8F1BCAEF69FF3A174" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgYieldIncMember" xlink:label="loc_nrg_NrgYieldIncMember_B6D81C443A784BE1E689AEF69FF3B926" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_66EB40FEBA8AE2BDF4A2AEF69FF316CF" xlink:to="loc_nrg_NrgYieldIncMember_B6D81C443A784BE1E689AEF69FF3B926" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_B5FF343553256DF8DAEAAEF69FF3F52D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityTable_3C3F449560E854C93A59AEF69FEE1063" xlink:to="loc_dei_LegalEntityAxis_B5FF343553256DF8DAEAAEF69FF3F52D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_A140A7DCA5CE233FE6BCAEF69FF31AAC_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_B5FF343553256DF8DAEAAEF69FF3F52D" xlink:to="loc_dei_EntityDomain_A140A7DCA5CE233FE6BCAEF69FF31AAC_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_A140A7DCA5CE233FE6BCAEF69FF31AAC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_B5FF343553256DF8DAEAAEF69FF3F52D" xlink:to="loc_dei_EntityDomain_A140A7DCA5CE233FE6BCAEF69FF31AAC" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldMember" xlink:label="loc_nrg_NRGYieldMember_DF7B04E386A17306051BAEF7A671ECB0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A140A7DCA5CE233FE6BCAEF69FF31AAC" xlink:to="loc_nrg_NRGYieldMember_DF7B04E386A17306051BAEF7A671ECB0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldLLCMember" xlink:label="loc_nrg_NRGYieldLLCMember_331522844D4507F57279AEF69FF344F1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A140A7DCA5CE233FE6BCAEF69FF31AAC" xlink:to="loc_nrg_NRGYieldLLCMember_331522844D4507F57279AEF69FF344F1" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgYieldIncMember" xlink:label="loc_nrg_NrgYieldIncMember_C5D0B86D54B187D64F8EAEF69FF31001" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A140A7DCA5CE233FE6BCAEF69FF31AAC" xlink:to="loc_nrg_NrgYieldIncMember_C5D0B86D54B187D64F8EAEF69FF31001" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_81645D945FFC68F6CF5BAEF69FF31159" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityTable_3C3F449560E854C93A59AEF69FEE1063" xlink:to="loc_us-gaap_StatementClassOfStockAxis_81645D945FFC68F6CF5BAEF69FF31159" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_F552824335A6E46C9D07AEF69FF35655_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_81645D945FFC68F6CF5BAEF69FF31159" xlink:to="loc_us-gaap_ClassOfStockDomain_F552824335A6E46C9D07AEF69FF35655_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_F552824335A6E46C9D07AEF69FF35655" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_81645D945FFC68F6CF5BAEF69FF31159" xlink:to="loc_us-gaap_ClassOfStockDomain_F552824335A6E46C9D07AEF69FF35655" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaap_CommonClassCMember_E7B8E3DD1B006A27225DAEF69FF4D404" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_F552824335A6E46C9D07AEF69FF35655" xlink:to="loc_us-gaap_CommonClassCMember_E7B8E3DD1B006A27225DAEF69FF4D404" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_5FDD49B82E863D60BE84AEF69FF41ACE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_F552824335A6E46C9D07AEF69FF35655" xlink:to="loc_us-gaap_CommonClassBMember_5FDD49B82E863D60BE84AEF69FF41ACE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CommonClassDMember" xlink:label="loc_nrg_CommonClassDMember_9A09CD14183C5B629DF2AEF69FF4935C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_F552824335A6E46C9D07AEF69FF35655" xlink:to="loc_nrg_CommonClassDMember_9A09CD14183C5B629DF2AEF69FF4935C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_577D3C2E0AA7B4F68E80AEF69FF464B0" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_F552824335A6E46C9D07AEF69FF35655" xlink:to="loc_us-gaap_CommonClassAMember_577D3C2E0AA7B4F68E80AEF69FF464B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockVotingRights" xlink:label="loc_us-gaap_CommonStockVotingRights_18236BAC629C3A34836AAEF69FF4B146" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_CommonStockVotingRights_18236BAC629C3A34836AAEF69FF4B146" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_F70D4EE34AAA0B2CD95AAEF69FF4BB07" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_F70D4EE34AAA0B2CD95AAEF69FF4BB07" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PartnersCapitalAccountUnitsSaleOfUnits" xlink:label="loc_us-gaap_PartnersCapitalAccountUnitsSaleOfUnits_B5260A522CE683B04B3AAEF69FF4C3EF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_PartnersCapitalAccountUnitsSaleOfUnits_B5260A522CE683B04B3AAEF69FF4C3EF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_BD67D43631865ED0BA9DAEF69FF49DB6" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_BD67D43631865ED0BA9DAEF69FF49DB6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_30C6BC5921AC0180C1BBAEF69FF421C4" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_30C6BC5921AC0180C1BBAEF69FF421C4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_44DC7A52AC34E632F7F8AEF69FF415DF" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_44DC7A52AC34E632F7F8AEF69FF415DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions" xlink:label="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_3E3E5D65386E8E60DB9DAEF69FF94778" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_3E3E5D65386E8E60DB9DAEF69FF94778" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_D871C9026B6822594961AEF69FFA9899" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfCapitalizationEquityLineItems_FB45D78A9F893012E0C4AEF69FF4B105" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_D871C9026B6822594961AEF69FFA9899" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructureStockholdersEquityTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_DFFCD18ACB76957D76A7A5288E5E7BC9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:to="loc_us-gaap_StatementTable_DFFCD18ACB76957D76A7A5288E5E7BC9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_9159150D9FFB608E2372A5288E5E0BFC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DFFCD18ACB76957D76A7A5288E5E7BC9" xlink:to="loc_us-gaap_StatementClassOfStockAxis_9159150D9FFB608E2372A5288E5E0BFC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_9159150D9FFB608E2372A5288E5E0BFC" xlink:to="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_9159150D9FFB608E2372A5288E5E0BFC" xlink:to="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_B4652C7EC7308B77F7FBA5288E5E4C71" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734" xlink:to="loc_us-gaap_CommonClassAMember_B4652C7EC7308B77F7FBA5288E5E4C71" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="loc_us-gaap_PreferredStockMember_CF118BD13AF4357A07AEA5288E5EB043" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734" xlink:to="loc_us-gaap_PreferredStockMember_CF118BD13AF4357A07AEA5288E5EB043" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_92C0CCFF98F9DFBCED95A5288E5E5875" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734" xlink:to="loc_us-gaap_CommonClassBMember_92C0CCFF98F9DFBCED95A5288E5E5875" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaap_CommonClassCMember_797C30C3E6DE792AB488A5288E5E6819" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734" xlink:to="loc_us-gaap_CommonClassCMember_797C30C3E6DE792AB488A5288E5E6819" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CommonClassDMember" xlink:label="loc_nrg_CommonClassDMember_C231A17C2C947C80AC88A5288E5ED30B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7103EEDC71D197D6BED5A5288E5E9734" xlink:to="loc_nrg_CommonClassDMember_C231A17C2C947C80AC88A5288E5ED30B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_5647B2C46D7940243370A5288E5E58FD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DFFCD18ACB76957D76A7A5288E5E7BC9" xlink:to="loc_us-gaap_StatementScenarioAxis_5647B2C46D7940243370A5288E5E58FD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_4B18CD5502B9CA370FADA5288E5E2608_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_5647B2C46D7940243370A5288E5E58FD" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_4B18CD5502B9CA370FADA5288E5E2608_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_4B18CD5502B9CA370FADA5288E5E2608" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_5647B2C46D7940243370A5288E5E58FD" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_4B18CD5502B9CA370FADA5288E5E2608" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_4F7F0E5DC54F5700FC34A5288E5EF885" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_4F7F0E5DC54F5700FC34A5288E5EF885" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_9255B8A58DD39DB154C2A5288E5EB011" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_9255B8A58DD39DB154C2A5288E5EB011" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_3DB830FEAE8E316413EBA5288E5ED02E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_3DB830FEAE8E316413EBA5288E5ED02E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_87D4841113C24C297067A5288E5EDFC8" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_87D4841113C24C297067A5288E5EDFC8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_4FF190D7217C256DB21FA5288E5E5CED" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:to="loc_us-gaap_PreferredStockSharesIssued_4FF190D7217C256DB21FA5288E5E5CED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_644EE04BF9E0512D17A0A5288E5E9695" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_644EE04BF9E0512D17A0A5288E5E9695" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_C4AD9E9F9E6BC721DD08A5288E5ECD21" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_70B0EE2A1B9DA559F7B6A5288E5E8650" xlink:to="loc_us-gaap_CommonStockSharesIssued_C4AD9E9F9E6BC721DD08A5288E5ECD21" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_8DDB6449AF406A3A0D36A5288E2F5AD7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_9889E7DB308BAD5FF1CEA5288E1F444E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_8DDB6449AF406A3A0D36A5288E2F5AD7" xlink:to="loc_us-gaap_StatementTable_9889E7DB308BAD5FF1CEA5288E1F444E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_CA688DE3286DBFA9E703A5288E1FF09A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9889E7DB308BAD5FF1CEA5288E1F444E" xlink:to="loc_us-gaap_StatementScenarioAxis_CA688DE3286DBFA9E703A5288E1FF09A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_46DD9C08684CF64102B4A5288E1F2D6D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_CA688DE3286DBFA9E703A5288E1FF09A" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_46DD9C08684CF64102B4A5288E1F2D6D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_46DD9C08684CF64102B4A5288E1F2D6D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_CA688DE3286DBFA9E703A5288E1FF09A" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_46DD9C08684CF64102B4A5288E1F2D6D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_17CED16D02250A5FCCFAA5288E1F5AC5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9889E7DB308BAD5FF1CEA5288E1F444E" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_17CED16D02250A5FCCFAA5288E1F5AC5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_F9742D9C210CF0AA035EA5288E1F9EB9_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_17CED16D02250A5FCCFAA5288E1F5AC5" xlink:to="loc_us-gaap_RelatedPartyDomain_F9742D9C210CF0AA035EA5288E1F9EB9_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_F9742D9C210CF0AA035EA5288E1F9EB9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_17CED16D02250A5FCCFAA5288E1F5AC5" xlink:to="loc_us-gaap_RelatedPartyDomain_F9742D9C210CF0AA035EA5288E1F9EB9" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgMember" xlink:label="loc_nrg_NrgMember_07B847D283C93B7AE90CA5288E1F3DC8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_F9742D9C210CF0AA035EA5288E1F9EB9" xlink:to="loc_nrg_NrgMember_07B847D283C93B7AE90CA5288E1F3DC8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_27D02FFF17D7505EA4D4A5288E2F50E5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8DDB6449AF406A3A0D36A5288E2F5AD7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_27D02FFF17D7505EA4D4A5288E2F50E5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_CCF8211A5699199B6080A5288E2F5C4D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_27D02FFF17D7505EA4D4A5288E2F50E5" xlink:to="loc_us-gaap_ProfitLoss_CCF8211A5699199B6080A5288E2F5C4D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_27D02FFF17D7505EA4D4A5288E2F50E5" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_9D32A6566D3828B15100A5288E2FC204" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_9D32A6566D3828B15100A5288E2FC204" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_180D1BE04546EC4DF24AA5288E2FFA25" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_180D1BE04546EC4DF24AA5288E2FFA25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_11A974776C8FB126EB84A5288E2FB6E1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_11A974776C8FB126EB84A5288E2FB6E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_9F598E3D53A0733DCEBBA5288E2FFFDA" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_9F598E3D53A0733DCEBBA5288E2FFFDA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_EC7923CE9368278B11D1A5288E2FF320" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_EC7923CE9368278B11D1A5288E2FF320" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_63E0C4539C079E557B6FA5288E2FB4DF" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_63E0C4539C079E557B6FA5288E2FB4DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities_58EF7719B14A9043A522A5288E2FAF25" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:to="loc_us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities_58EF7719B14A9043A522A5288E2FAF25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_0870282438A656E98DDFA5288E2F62A4" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_0C2F203D1DE4FA31A015A5288E2F3ACD" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_0870282438A656E98DDFA5288E2F62A4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_B290CC163CA0866657CDA5288E2FB7E5" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_27D02FFF17D7505EA4D4A5288E2F50E5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_B290CC163CA0866657CDA5288E2FB7E5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8DDB6449AF406A3A0D36A5288E2F5AD7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_131657CECAC1AB23F7A2A5288E2F3333" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_131657CECAC1AB23F7A2A5288E2F3333" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AcquisitionofAssetsUnderCommonControl" xlink:label="loc_nrg_AcquisitionofAssetsUnderCommonControl_9AB8F508A9A031CFBEFBA5288E2F5CCC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_nrg_AcquisitionofAssetsUnderCommonControl_9AB8F508A9A031CFBEFBA5288E2F5CCC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_CB947A28A75E3643B857A5288E2F0199" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_CB947A28A75E3643B857A5288E2F0199" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInRestrictedCash" xlink:label="loc_us-gaap_IncreaseDecreaseInRestrictedCash_BD8FD847B2FEE7C1EF5EA5288E2FA228" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_us-gaap_IncreaseDecreaseInRestrictedCash_BD8FD847B2FEE7C1EF5EA5288E2FA228" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForProceedsFromLoansReceivable" xlink:label="loc_us-gaap_PaymentsForProceedsFromLoansReceivable_26F1585C4672DB38BA90A5288E2FB2C1" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_us-gaap_PaymentsForProceedsFromLoansReceivable_26F1585C4672DB38BA90A5288E2FB2C1" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ProceedsFromRenewableEnergyGrants" xlink:label="loc_nrg_ProceedsFromRenewableEnergyGrants_5F251E48B97DF67B371DA5288E2FC947" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_nrg_ProceedsFromRenewableEnergyGrants_5F251E48B97DF67B371DA5288E2FC947" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_B96E5B8083118C169525A5288E2F3AAD" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_B96E5B8083118C169525A5288E2F3AAD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_94B03BC8F7C4112FBA23A5288E2FD5B1" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_94B03BC8F7C4112FBA23A5288E2FD5B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4C09DE20B70A25173AB3A5288E2FD9F9" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7D9AFA0BAA7E9C6DEF15A5288E2F4BE4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4C09DE20B70A25173AB3A5288E2FD9F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8DDB6449AF406A3A0D36A5288E2F5AD7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromMinorityShareholders" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_4D0474690577EB4CB43CA5288E2FFBC1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_4D0474690577EB4CB43CA5288E2FFBC1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromContributionsFromParent" xlink:label="loc_us-gaap_ProceedsFromContributionsFromParent_D1CBA9A568D223B49E7CA5288E2F8773" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_ProceedsFromContributionsFromParent_D1CBA9A568D223B49E7CA5288E2F8773" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsOfCapitalDistribution" xlink:label="loc_us-gaap_PaymentsOfCapitalDistribution_B4399620074478866466A5288E3F65DD" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_PaymentsOfCapitalDistribution_B4399620074478866466A5288E3F65DD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_1E1D48B19D32159DA61EA5288E3FF16A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_1E1D48B19D32159DA61EA5288E3FF16A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="loc_us-gaap_PaymentsOfDividends_A4DF928BE7C4048A3C3DA5288E3F2844" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_PaymentsOfDividends_A4DF928BE7C4048A3C3DA5288E3F2844" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_359A5E1DEB6BCF8BA169A5288E3FEAD3" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_359A5E1DEB6BCF8BA169A5288E3FEAD3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_BEF84BA894CE9802D9F5A5288E3FB4B3" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_BEF84BA894CE9802D9F5A5288E3FB4B3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfDebt" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfDebt_B363330FB11CF1D54DD7A5288E3F93A8" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfDebt_B363330FB11CF1D54DD7A5288E3F93A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_BBDC761C05102262E98FA5288E3FF9CD" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_18703295931B6DD26C96A5288E2F2468" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_BBDC761C05102262E98FA5288E3FF9CD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_64B2B4BC953F4B1EA816A5288E3FAC37" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8DDB6449AF406A3A0D36A5288E2F5AD7" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_64B2B4BC953F4B1EA816A5288E3FAC37" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7874434B08D3B1680874A5288E3F0E47" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8DDB6449AF406A3A0D36A5288E2F5AD7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7874434B08D3B1680874A5288E3F0E47" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_4D71A31100B54C073BCDCE2228C19F8C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_45ED346D3D0CDEAF65B7CE2228C1D43C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4D71A31100B54C073BCDCE2228C19F8C" xlink:to="loc_us-gaap_StatementTable_45ED346D3D0CDEAF65B7CE2228C1D43C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_308C576726B719CACDC7CE2228C13B8D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_45ED346D3D0CDEAF65B7CE2228C1D43C" xlink:to="loc_us-gaap_StatementScenarioAxis_308C576726B719CACDC7CE2228C13B8D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_043B045A0C1A59FC93D8CE2228C18938_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_308C576726B719CACDC7CE2228C13B8D" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_043B045A0C1A59FC93D8CE2228C18938_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_043B045A0C1A59FC93D8CE2228C18938" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_308C576726B719CACDC7CE2228C13B8D" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_043B045A0C1A59FC93D8CE2228C18938" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_EBEB21304F09AFA72F24CE2228C116E8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4D71A31100B54C073BCDCE2228C19F8C" xlink:to="loc_us-gaap_ProfitLoss_EBEB21304F09AFA72F24CE2228C116E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_42A9FAEEE33EEFF6CFB0CE2228C15646" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4D71A31100B54C073BCDCE2228C19F8C" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_42A9FAEEE33EEFF6CFB0CE2228C15646" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8E817B595BB10E7C800CE2228C188B5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_42A9FAEEE33EEFF6CFB0CE2228C15646" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8E817B595BB10E7C800CE2228C188B5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_790EEB52BE1D9A2482D9CE2228C1340C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_42A9FAEEE33EEFF6CFB0CE2228C15646" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_790EEB52BE1D9A2482D9CE2228C1340C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_018C97E7B0C1A7CE2C62CE2228C17820" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_42A9FAEEE33EEFF6CFB0CE2228C15646" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_018C97E7B0C1A7CE2C62CE2228C17820" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LessPreacquisitionnetincomeofAcquiredROFOassets" xlink:label="loc_nrg_LessPreacquisitionnetincomeofAcquiredROFOassets_838F23BF8A864757B9ABCE2228C11C20" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_42A9FAEEE33EEFF6CFB0CE2228C15646" xlink:to="loc_nrg_LessPreacquisitionnetincomeofAcquiredROFOassets_838F23BF8A864757B9ABCE2228C11C20" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_1A159672033FD547CF3FCE2228C13061" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_42A9FAEEE33EEFF6CFB0CE2228C15646" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_1A159672033FD547CF3FCE2228C13061" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_1AF8E2D7EE8F3C5BE68BCE2228C11D39" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_42A9FAEEE33EEFF6CFB0CE2228C15646" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_1AF8E2D7EE8F3C5BE68BCE2228C11D39" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeParenthetical" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfOperations" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_1A8989A82B4C86BDBC9ED2E83C443394" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_StatementTable_1A8989A82B4C86BDBC9ED2E83C443394" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_21671083727111DB3C19D2E83C44746D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1A8989A82B4C86BDBC9ED2E83C443394" xlink:to="loc_us-gaap_StatementClassOfStockAxis_21671083727111DB3C19D2E83C44746D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_AE45AEC4F8EF11E24621D2E83C445FA8_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_21671083727111DB3C19D2E83C44746D" xlink:to="loc_us-gaap_ClassOfStockDomain_AE45AEC4F8EF11E24621D2E83C445FA8_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_AE45AEC4F8EF11E24621D2E83C445FA8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_21671083727111DB3C19D2E83C44746D" xlink:to="loc_us-gaap_ClassOfStockDomain_AE45AEC4F8EF11E24621D2E83C445FA8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_BF7542BF2E8A73EF1C28D2E83C4E128B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_AE45AEC4F8EF11E24621D2E83C445FA8" xlink:to="loc_us-gaap_CommonClassAMember_BF7542BF2E8A73EF1C28D2E83C4E128B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaap_CommonClassCMember_85BA2DE0C04FCBCB4F7FD2E83C4E7DFD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_AE45AEC4F8EF11E24621D2E83C445FA8" xlink:to="loc_us-gaap_CommonClassCMember_85BA2DE0C04FCBCB4F7FD2E83C4E7DFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_D1218C680B7686AE2B8BD2E83C4EA37C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_RevenuesAbstract_D1218C680B7686AE2B8BD2E83C4EA37C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_E94F513F57B31E618673D2E83C4EA383" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_D1218C680B7686AE2B8BD2E83C4EA37C" xlink:to="loc_us-gaap_Revenues_E94F513F57B31E618673D2E83C4EA383" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingCostsAndExpensesAbstract" xlink:label="loc_us-gaap_OperatingCostsAndExpensesAbstract_F866E86002125C5E1061D2E83C4E9E10" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_OperatingCostsAndExpensesAbstract_F866E86002125C5E1061D2E83C4E9E10" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_C4718850DB484D075E05D2E83C4EA028" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_F866E86002125C5E1061D2E83C4E9E10" xlink:to="loc_us-gaap_CostOfRevenue_C4718850DB484D075E05D2E83C4EA028" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_310C3E7A9DFCF9DD8FDAD2E83C4EA20F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_F866E86002125C5E1061D2E83C4E9E10" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_310C3E7A9DFCF9DD8FDAD2E83C4EA20F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_4B5567F1BF4E179648ABD2E83C4EBE6A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_F866E86002125C5E1061D2E83C4E9E10" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_4B5567F1BF4E179648ABD2E83C4EBE6A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_DBC51302A30B142A2989D2E83C4E2FBD" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_F866E86002125C5E1061D2E83C4E9E10" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_DBC51302A30B142A2989D2E83C4E2FBD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_88114D71A8129F25DA29D2E83C4EFEA5" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingCostsAndExpensesAbstract_F866E86002125C5E1061D2E83C4E9E10" xlink:to="loc_us-gaap_CostsAndExpenses_88114D71A8129F25DA29D2E83C4EFEA5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_C91BD97CFD733816D2E8D2E83C4EFB58" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_OperatingIncomeLoss_C91BD97CFD733816D2E8D2E83C4EFB58" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_5A7424D280E7C1882AA2D2E83C4ED344" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_5A7424D280E7C1882AA2D2E83C4ED344" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_3EF45C0071D6593D925AD2E83C4EFF0E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_5A7424D280E7C1882AA2D2E83C4ED344" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_3EF45C0071D6593D925AD2E83C4EFF0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_80ED46EA98637B2B8854D2E83C4EE926" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_5A7424D280E7C1882AA2D2E83C4ED344" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_80ED46EA98637B2B8854D2E83C4EE926" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_F1208ED7E1FB64828601D2E83C4E5F25" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_5A7424D280E7C1882AA2D2E83C4ED344" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_F1208ED7E1FB64828601D2E83C4E5F25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_956DC84342B9993E359CD2E83C4EE194" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_5A7424D280E7C1882AA2D2E83C4ED344" xlink:to="loc_us-gaap_InterestExpense_956DC84342B9993E359CD2E83C4EE194" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_54D4FF68B76793920184D2E83C4E9E22" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_5A7424D280E7C1882AA2D2E83C4ED344" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_54D4FF68B76793920184D2E83C4E9E22" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_EA957BBF05273123EAA8D2E83C4E1ED0" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_EA957BBF05273123EAA8D2E83C4E1ED0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_37403F7C2DAC792619B4D2E83C4E85A6" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_37403F7C2DAC792619B4D2E83C4E85A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_DAECB6182CFA7EC68D55D2E83C4E70C2" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_ProfitLoss_DAECB6182CFA7EC68D55D2E83C4E70C2" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LessPreacquisitionnetincomeofAcquiredROFOassets" xlink:label="loc_nrg_LessPreacquisitionnetincomeofAcquiredROFOassets_962F8A4C6199B2553464D2E83C4E79D5" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_nrg_LessPreacquisitionnetincomeofAcquiredROFOassets_962F8A4C6199B2553464D2E83C4E79D5" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NetIncomeexcludingpreacquisitionnetincomeofAcquiredROFOassets" xlink:label="loc_nrg_NetIncomeexcludingpreacquisitionnetincomeofAcquiredROFOassets_83E25DCD6D67CB76797FD2E83C4E1199" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_nrg_NetIncomeexcludingpreacquisitionnetincomeofAcquiredROFOassets_83E25DCD6D67CB76797FD2E83C4E1199" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_11EBE34DAF4FF4D76DCAD2E83C4E5FEB" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_11EBE34DAF4FF4D76DCAD2E83C4E5FEB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_83FC04431B5E0A0275BAD2E83C4EE4E9" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_83FC04431B5E0A0275BAD2E83C4EE4E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_6635CC0DC945DB1E354CD2E83C4EACC9" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_EarningsPerShareAbstract_6635CC0DC945DB1E354CD2E83C4EACC9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_41E14D7BEEBB3ADA04B9D2E83C4E58CB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_6635CC0DC945DB1E354CD2E83C4EACC9" xlink:to="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_41E14D7BEEBB3ADA04B9D2E83C4E58CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_28E55B3C1FB76B17BC80D2E83C4EFA4C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_6635CC0DC945DB1E354CD2E83C4EACC9" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDiluted_28E55B3C1FB76B17BC80D2E83C4EFA4C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_BEE9726F78B3264D1901D2E83C4EE892" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D734649FF2BEFE5E9976D2E83C4E0097" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_BEE9726F78B3264D1901D2E83C4EE892" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/DocumentAndEntityInformation" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_223873C93A3AC5A2E18DD2E83C6CC31D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_308E727E17CAABDACC78D2E83C6C4AF4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_223873C93A3AC5A2E18DD2E83C6CC31D" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_308E727E17CAABDACC78D2E83C6C4AF4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_8D323389B349B23857C9D2E83C6C6961" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_308E727E17CAABDACC78D2E83C6C4AF4" xlink:to="loc_us-gaap_StatementClassOfStockAxis_8D323389B349B23857C9D2E83C6C6961" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_8B96B719EB542DDAF72AD2E83C6CF1D9_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_8D323389B349B23857C9D2E83C6C6961" xlink:to="loc_us-gaap_ClassOfStockDomain_8B96B719EB542DDAF72AD2E83C6CF1D9_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_8B96B719EB542DDAF72AD2E83C6CF1D9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_8D323389B349B23857C9D2E83C6C6961" xlink:to="loc_us-gaap_ClassOfStockDomain_8B96B719EB542DDAF72AD2E83C6CF1D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_BEFD7B3D5E528B9CCCB3D2E83C6C4277" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8B96B719EB542DDAF72AD2E83C6CF1D9" xlink:to="loc_us-gaap_CommonClassAMember_BEFD7B3D5E528B9CCCB3D2E83C6C4277" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaap_CommonClassBMember_A7CFDBFD8926AEC3CD79D2E83C6C4249" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8B96B719EB542DDAF72AD2E83C6CF1D9" xlink:to="loc_us-gaap_CommonClassBMember_A7CFDBFD8926AEC3CD79D2E83C6C4249" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaap_CommonClassCMember_AEE918A7603D0447437BD2E83C6C9F60" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8B96B719EB542DDAF72AD2E83C6CF1D9" xlink:to="loc_us-gaap_CommonClassCMember_AEE918A7603D0447437BD2E83C6C9F60" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CommonClassDMember" xlink:label="loc_nrg_CommonClassDMember_4C68F01A5461DD5242E1D2E83C6C169C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8B96B719EB542DDAF72AD2E83C6CF1D9" xlink:to="loc_nrg_CommonClassDMember_4C68F01A5461DD5242E1D2E83C6C169C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_E20AD9CF8C3F01BFA351D2E83C76E393" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_223873C93A3AC5A2E18DD2E83C6CC31D" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_E20AD9CF8C3F01BFA351D2E83C76E393" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/EarningsPerShare" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/EarningsPerShareDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2279FD7F491BE40AF868CEBD81ADA5D2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_E5CDA9D18CB0B1819594CEBD81AD7724" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2279FD7F491BE40AF868CEBD81ADA5D2" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_E5CDA9D18CB0B1819594CEBD81AD7724" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_387E37C14F9F1F84B174CEBD81AD5F79" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_E5CDA9D18CB0B1819594CEBD81AD7724" xlink:to="loc_us-gaap_DebtInstrumentAxis_387E37C14F9F1F84B174CEBD81AD5F79" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_A7A43319FA217906DA19CEBD81AD5F41_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_387E37C14F9F1F84B174CEBD81AD5F79" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_A7A43319FA217906DA19CEBD81AD5F41_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_A7A43319FA217906DA19CEBD81AD5F41" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_387E37C14F9F1F84B174CEBD81AD5F79" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_A7A43319FA217906DA19CEBD81AD5F41" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_A3.5ConvertibleNotesdue2019Member" xlink:label="loc_nrg_A3.5ConvertibleNotesdue2019Member_35FD65991D9A8B1E2474CEBD81ADD5D1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_A7A43319FA217906DA19CEBD81AD5F41" xlink:to="loc_nrg_A3.5ConvertibleNotesdue2019Member_35FD65991D9A8B1E2474CEBD81ADD5D1" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_A3.25ConvertibleNotesdue2020Member" xlink:label="loc_nrg_A3.25ConvertibleNotesdue2020Member_99F000C759B925466292CEBD81ADBF7F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_A7A43319FA217906DA19CEBD81AD5F41" xlink:to="loc_nrg_A3.25ConvertibleNotesdue2020Member_99F000C759B925466292CEBD81ADBF7F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_F4883D8686D447D9288CCEBD81ADF147" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_E5CDA9D18CB0B1819594CEBD81AD7724" xlink:to="loc_us-gaap_StatementClassOfStockAxis_F4883D8686D447D9288CCEBD81ADF147" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_AB6422A625E85DEA578FCEBD81ADE16C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_F4883D8686D447D9288CCEBD81ADF147" xlink:to="loc_us-gaap_ClassOfStockDomain_AB6422A625E85DEA578FCEBD81ADE16C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_AB6422A625E85DEA578FCEBD81ADE16C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_F4883D8686D447D9288CCEBD81ADF147" xlink:to="loc_us-gaap_ClassOfStockDomain_AB6422A625E85DEA578FCEBD81ADE16C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_C65949F61CC2F10F2955CEBD81AD5F7D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_AB6422A625E85DEA578FCEBD81ADE16C" xlink:to="loc_us-gaap_CommonClassAMember_C65949F61CC2F10F2955CEBD81AD5F7D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaap_CommonClassCMember_5BEA7B9F9A2213BD92A9CEBD81ADA43D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_AB6422A625E85DEA578FCEBD81ADE16C" xlink:to="loc_us-gaap_CommonClassCMember_5BEA7B9F9A2213BD92A9CEBD81ADA43D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_91F59B5AD77CB3D4A74FCEBD81AD0E35" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_E5CDA9D18CB0B1819594CEBD81AD7724" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_91F59B5AD77CB3D4A74FCEBD81AD0E35" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0CC4CFDB287B9BB74D02CEBD81ADE51D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_91F59B5AD77CB3D4A74FCEBD81AD0E35" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0CC4CFDB287B9BB74D02CEBD81ADE51D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0CC4CFDB287B9BB74D02CEBD81ADE51D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_91F59B5AD77CB3D4A74FCEBD81AD0E35" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_0CC4CFDB287B9BB74D02CEBD81ADE51D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_D911DE2926B839BAA331CEBD81AD7A8E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2279FD7F491BE40AF868CEBD81ADA5D2" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_D911DE2926B839BAA331CEBD81AD7A8E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/EarningsPerShareTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstruments" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsBalanceSheetGroupingDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_EE2C07B82DFC8618C232AD2FBD9697C5" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_A6CFAD9623E098973FBDAD2FBD9528DB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_EE2C07B82DFC8618C232AD2FBD9697C5" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_A6CFAD9623E098973FBDAD2FBD9528DB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_2C6EAF2D20F6A2C347CCAD2FBD96908A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_A6CFAD9623E098973FBDAD2FBD9528DB" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_2C6EAF2D20F6A2C347CCAD2FBD96908A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_A9B6AE967CFA440B6683AD2FBD96F967_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_2C6EAF2D20F6A2C347CCAD2FBD96908A" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_A9B6AE967CFA440B6683AD2FBD96F967_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_A9B6AE967CFA440B6683AD2FBD96F967" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_2C6EAF2D20F6A2C347CCAD2FBD96908A" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_A9B6AE967CFA440B6683AD2FBD96F967" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_0BDE95485587E446FC34AD2FBE4AFB73" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_A9B6AE967CFA440B6683AD2FBD96F967" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_0BDE95485587E446FC34AD2FBE4AFB73" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_039407ECB36FF8B1E3AAAD2FBE71B597" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_A9B6AE967CFA440B6683AD2FBD96F967" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_039407ECB36FF8B1E3AAAD2FBE71B597" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NotesReceivableNet" xlink:label="loc_us-gaap_NotesReceivableNet_19AF56651790DDCA5517AD2FBDE4823D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_EE2C07B82DFC8618C232AD2FBD9697C5" xlink:to="loc_us-gaap_NotesReceivableNet_19AF56651790DDCA5517AD2FBDE4823D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_C50F9D538C457474B3E2AD2FBE09E970" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_EE2C07B82DFC8618C232AD2FBD9697C5" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_C50F9D538C457474B3E2AD2FBE09E970" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsCreditRiskAndDerivativeFvMeasurementsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsRecurringFairValueDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_033AC74C37A5542DEF45A4E703FE51EE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_55B984C5CFE8CE424D72A4E703FE15A5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_033AC74C37A5542DEF45A4E703FE51EE" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_55B984C5CFE8CE424D72A4E703FE15A5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_46C6FA84F67463621843A4E703FE1E81" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_55B984C5CFE8CE424D72A4E703FE15A5" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_46C6FA84F67463621843A4E703FE1E81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_933A4AA63D6E4040A665A4E703FE7BC6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_46C6FA84F67463621843A4E703FE1E81" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_933A4AA63D6E4040A665A4E703FE7BC6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_933A4AA63D6E4040A665A4E703FE7BC6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_46C6FA84F67463621843A4E703FE1E81" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_933A4AA63D6E4040A665A4E703FE7BC6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_83C88D53650108F85609A4E703FE0B14" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_933A4AA63D6E4040A665A4E703FE7BC6" xlink:to="loc_us-gaap_CommodityContractMember_83C88D53650108F85609A4E703FE0B14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestRateContractMember" xlink:label="loc_us-gaap_InterestRateContractMember_363752860EAACDBC714DA4E703FED251" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_933A4AA63D6E4040A665A4E703FE7BC6" xlink:to="loc_us-gaap_InterestRateContractMember_363752860EAACDBC714DA4E703FED251" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6A6E75A2EB3625EC7300A4E703FE92CD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_55B984C5CFE8CE424D72A4E703FE15A5" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6A6E75A2EB3625EC7300A4E703FE92CD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_DB3B4FA4FEB8637D7686A4E703FEF843_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6A6E75A2EB3625EC7300A4E703FE92CD" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_DB3B4FA4FEB8637D7686A4E703FEF843_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_DB3B4FA4FEB8637D7686A4E703FEF843" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6A6E75A2EB3625EC7300A4E703FE92CD" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_DB3B4FA4FEB8637D7686A4E703FEF843" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_194302957EC8713EDBD8A4E703FE414F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_DB3B4FA4FEB8637D7686A4E703FEF843" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_194302957EC8713EDBD8A4E703FE414F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6E19653716F5B149F2FCA4E703FE5689" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_55B984C5CFE8CE424D72A4E703FE15A5" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6E19653716F5B149F2FCA4E703FE5689" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25DE7A626D73CD988660A4E703FE53CA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6E19653716F5B149F2FCA4E703FE5689" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25DE7A626D73CD988660A4E703FE53CA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25DE7A626D73CD988660A4E703FE53CA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6E19653716F5B149F2FCA4E703FE5689" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25DE7A626D73CD988660A4E703FE53CA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_93FC17BA112CC75C7E83A4E703FE17A2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25DE7A626D73CD988660A4E703FE53CA" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_93FC17BA112CC75C7E83A4E703FE17A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_5E3C74BFF8419EC425DCA4E703FE8CA6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25DE7A626D73CD988660A4E703FE53CA" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_5E3C74BFF8419EC425DCA4E703FE8CA6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_052A8A56AEAE9B1B819BA4E703FE6546" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25DE7A626D73CD988660A4E703FE53CA" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_052A8A56AEAE9B1B819BA4E703FE6546" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_19344F3068701710ADE1A4E703FE62C8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_033AC74C37A5542DEF45A4E703FE51EE" xlink:to="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_19344F3068701710ADE1A4E703FE62C8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_DC0D322DBEFFED73EAD1A4E703FE328B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_033AC74C37A5542DEF45A4E703FE51EE" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_DC0D322DBEFFED73EAD1A4E703FE328B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_5AEC05F523C5E3FD104FA4E703FEDB3B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_033AC74C37A5542DEF45A4E703FE51EE" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_5AEC05F523C5E3FD104FA4E703FEDB3B" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/IncomeTaxes" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/IncomeTaxesProvisionDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_71A5FDE651FA5565463BFAA78B2EF4FB" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxContingencyTable" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_B060B8A978CAFD0A7F56FAA78B2EAF4A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_71A5FDE651FA5565463BFAA78B2EF4FB" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_B060B8A978CAFD0A7F56FAA78B2EAF4A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_2F0FBA764415C5A5AA76FAA78B2EB00F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_B060B8A978CAFD0A7F56FAA78B2EAF4A" xlink:to="loc_dei_LegalEntityAxis_2F0FBA764415C5A5AA76FAA78B2EB00F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_1BF4D23733C831582368FAA78B2E6F30_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_2F0FBA764415C5A5AA76FAA78B2EB00F" xlink:to="loc_dei_EntityDomain_1BF4D23733C831582368FAA78B2E6F30_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_1BF4D23733C831582368FAA78B2E6F30" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_2F0FBA764415C5A5AA76FAA78B2EB00F" xlink:to="loc_dei_EntityDomain_1BF4D23733C831582368FAA78B2E6F30" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldLLCMember" xlink:label="loc_nrg_NRGYieldLLCMember_218204907882836ED018FAA78B2E7826" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_1BF4D23733C831582368FAA78B2E6F30" xlink:to="loc_nrg_NRGYieldLLCMember_218204907882836ED018FAA78B2E7826" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_AD854884514F0D1CA507FAA78B2EC5F4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_71A5FDE651FA5565463BFAA78B2EF4FB" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_AD854884514F0D1CA507FAA78B2EC5F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_94B6064CE32EC057EBABFAA78B2F81A2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_AD854884514F0D1CA507FAA78B2EC5F4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_94B6064CE32EC057EBABFAA78B2F81A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_0DA4FFE1913A96143CABFAA78B2F3B1E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_AD854884514F0D1CA507FAA78B2EC5F4" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_0DA4FFE1913A96143CABFAA78B2F3B1E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_81C053E80BF56CF6712DFAA78B2FE873" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_AD854884514F0D1CA507FAA78B2EC5F4" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_81C053E80BF56CF6712DFAA78B2FE873" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_D0594DB2719BDEDA0058FAA78B2F9C0A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_71A5FDE651FA5565463BFAA78B2EF4FB" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_D0594DB2719BDEDA0058FAA78B2F9C0A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_32B3A6B6630D0AB380CCFAA78B2FB81F" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_71A5FDE651FA5565463BFAA78B2EF4FB" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_32B3A6B6630D0AB380CCFAA78B2FB81F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/IncomeTaxesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/LongTermDebt" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/LongTermDebtLongTermDebtAltaAvenalwestHoldingsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesByTypeAxis" xlink:label="loc_nrg_PowerGenerationFacilitiesByTypeAxis_BDD9A034060E99C08539A51481D96E73" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:to="loc_nrg_PowerGenerationFacilitiesByTypeAxis_BDD9A034060E99C08539A51481D96E73" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_A3C755221B82F1BFF04EA51481D9E1FC_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_BDD9A034060E99C08539A51481D96E73" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_A3C755221B82F1BFF04EA51481D9E1FC_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_A3C755221B82F1BFF04EA51481D9E1FC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_BDD9A034060E99C08539A51481D96E73" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_A3C755221B82F1BFF04EA51481D9E1FC" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_UtilityScaleSolarMember" xlink:label="loc_nrg_UtilityScaleSolarMember_D942AEAA634FECF5CE9AA51481D9FF08" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_A3C755221B82F1BFF04EA51481D9E1FC" xlink:to="loc_nrg_UtilityScaleSolarMember_D942AEAA634FECF5CE9AA51481D9FF08" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DebtInstrumentPeriodAxis" xlink:label="loc_nrg_DebtInstrumentPeriodAxis_9CDD899A266CDE439729A51481D998EE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:to="loc_nrg_DebtInstrumentPeriodAxis_9CDD899A266CDE439729A51481D998EE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DebtInstrumentPeriodDomain" xlink:label="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_DebtInstrumentPeriodAxis_9CDD899A266CDE439729A51481D998EE" xlink:to="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DebtInstrumentPeriodDomain" xlink:label="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_DebtInstrumentPeriodAxis_9CDD899A266CDE439729A51481D998EE" xlink:to="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_September222010toMarch182015Member" xlink:label="loc_nrg_September222010toMarch182015Member_48353D8C6DF6C32AB10BA51481D9B01A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219" xlink:to="loc_nrg_September222010toMarch182015Member_48353D8C6DF6C32AB10BA51481D9B01A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_March182015toMarch172022Member" xlink:label="loc_nrg_March182015toMarch172022Member_CE19A409FBE6D3FB4205A51481D9F570" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219" xlink:to="loc_nrg_March182015toMarch172022Member_CE19A409FBE6D3FB4205A51481D9F570" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_March182022toMarch172027Member" xlink:label="loc_nrg_March182022toMarch172027Member_F92328D93F5C112633F9A51481D9F958" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219" xlink:to="loc_nrg_March182022toMarch172027Member_F92328D93F5C112633F9A51481D9F958" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_March182027throughMaturityMember" xlink:label="loc_nrg_March182027throughMaturityMember_A2A116D1DF8774F4E6CFA51481DAE159" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219" xlink:to="loc_nrg_March182027throughMaturityMember_A2A116D1DF8774F4E6CFA51481DAE159" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_September12017toAugust312020Member" xlink:label="loc_nrg_September12017toAugust312020Member_F3967F086ED85C996A0EA51481DAD4BE" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219" xlink:to="loc_nrg_September12017toAugust312020Member_F3967F086ED85C996A0EA51481DAD4BE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_September12020throughmaturityMember" xlink:label="loc_nrg_September12020throughmaturityMember_AE4CF0850EEF49340456A51481DAD45D" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_93C6F73BE5B38DAA2A22A51481D99219" xlink:to="loc_nrg_September12020throughmaturityMember_AE4CF0850EEF49340456A51481DAD45D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_FD139040B2D7596548E6A51481DA66FC" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_FD139040B2D7596548E6A51481DA66FC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_D2ECCC51823936E0B7E0A51481DAAF92_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_FD139040B2D7596548E6A51481DA66FC" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_D2ECCC51823936E0B7E0A51481DAAF92_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_D2ECCC51823936E0B7E0A51481DAAF92" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_FD139040B2D7596548E6A51481DA66FC" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_D2ECCC51823936E0B7E0A51481DAAF92" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AvenalMember" xlink:label="loc_nrg_AvenalMember_E0DCC82CF56605D2B401A51481DACE7F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_D2ECCC51823936E0B7E0A51481DAAF92" xlink:to="loc_nrg_AvenalMember_E0DCC82CF56605D2B401A51481DACE7F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_CD330628E78046C48ED4A51481DAE46F" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_CD330628E78046C48ED4A51481DAE46F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_2ABEC93662F1CA447E46A51481DA72FC_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_CD330628E78046C48ED4A51481DAE46F" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_2ABEC93662F1CA447E46A51481DA72FC_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_2ABEC93662F1CA447E46A51481DA72FC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_CD330628E78046C48ED4A51481DAE46F" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_2ABEC93662F1CA447E46A51481DA72FC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_A1A22C9B4C065F27037AA51481DA25CB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_2ABEC93662F1CA447E46A51481DA72FC" xlink:to="loc_us-gaap_InterestRateSwapMember_A1A22C9B4C065F27037AA51481DA25CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsByNameAxis" xlink:label="loc_us-gaap_OtherOwnershipInterestsByNameAxis_70E5A13F1CCC4AA32BB5A51481DA7F38" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:to="loc_us-gaap_OtherOwnershipInterestsByNameAxis_70E5A13F1CCC4AA32BB5A51481DA7F38" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsNameDomain" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_6AB5601CDFC7FF9E4BCCA51481DA6A0E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_70E5A13F1CCC4AA32BB5A51481DA7F38" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_6AB5601CDFC7FF9E4BCCA51481DA6A0E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsNameDomain" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_6AB5601CDFC7FF9E4BCCA51481DA6A0E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_70E5A13F1CCC4AA32BB5A51481DA7F38" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_6AB5601CDFC7FF9E4BCCA51481DA6A0E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_FinancialInstitutionsMember" xlink:label="loc_nrg_FinancialInstitutionsMember_6204E0682B21A25C524CA51481DBA71B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherOwnershipInterestsNameDomain_6AB5601CDFC7FF9E4BCCA51481DA6A0E" xlink:to="loc_nrg_FinancialInstitutionsMember_6204E0682B21A25C524CA51481DBA71B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_7FD2FE0B2A9B782E12A8A51481DB342A" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:to="loc_dei_LegalEntityAxis_7FD2FE0B2A9B782E12A8A51481DB342A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_F344E47FB2EB65D54A9CA51481DB6E77_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_7FD2FE0B2A9B782E12A8A51481DB342A" xlink:to="loc_dei_EntityDomain_F344E47FB2EB65D54A9CA51481DB6E77_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_F344E47FB2EB65D54A9CA51481DB6E77" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_7FD2FE0B2A9B782E12A8A51481DB342A" xlink:to="loc_dei_EntityDomain_F344E47FB2EB65D54A9CA51481DB6E77" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AvenalMember" xlink:label="loc_nrg_AvenalMember_84575C6E52F2DF9A4812A51481DB57E9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_F344E47FB2EB65D54A9CA51481DB6E77" xlink:to="loc_nrg_AvenalMember_84575C6E52F2DF9A4812A51481DB57E9" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaXandXITEHoldcoMember" xlink:label="loc_nrg_AltaXandXITEHoldcoMember_0BB64F69EF3CBAAADE85A51481DBC65D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_F344E47FB2EB65D54A9CA51481DB6E77" xlink:to="loc_nrg_AltaXandXITEHoldcoMember_0BB64F69EF3CBAAADE85A51481DBC65D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_5CCC0F7BEBC35571BBBDA51481DBBA48" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_5CCC0F7BEBC35571BBBDA51481DBBA48" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9D8111458A505AF9D584A51481DB4752_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5CCC0F7BEBC35571BBBDA51481DBBA48" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9D8111458A505AF9D584A51481DB4752_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9D8111458A505AF9D584A51481DB4752" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5CCC0F7BEBC35571BBBDA51481DBBA48" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9D8111458A505AF9D584A51481DB4752" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WorkingCapitalFacilityMember" xlink:label="loc_nrg_WorkingCapitalFacilityMember_160852B8A79B9BC20EDEA51481DBF74D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_9D8111458A505AF9D584A51481DB4752" xlink:to="loc_nrg_WorkingCapitalFacilityMember_160852B8A79B9BC20EDEA51481DBF74D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_EE441F8CCA547B48510FA51481DB19DE" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4F93BDD64BF4BD148143A51481D9C4A7" xlink:to="loc_us-gaap_DebtInstrumentAxis_EE441F8CCA547B48510FA51481DB19DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_DA525FAB8E94B2EC7D13A51481DB0E82_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_EE441F8CCA547B48510FA51481DB19DE" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_DA525FAB8E94B2EC7D13A51481DB0E82_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_DA525FAB8E94B2EC7D13A51481DB0E82" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_EE441F8CCA547B48510FA51481DB19DE" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_DA525FAB8E94B2EC7D13A51481DB0E82" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WestHoldingsCreditAgreementdue2023TrancheAMember" xlink:label="loc_nrg_WestHoldingsCreditAgreementdue2023TrancheAMember_EF67B6BBC8820BB8713DA51481DBD3A0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DA525FAB8E94B2EC7D13A51481DB0E82" xlink:to="loc_nrg_WestHoldingsCreditAgreementdue2023TrancheAMember_EF67B6BBC8820BB8713DA51481DBD3A0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindXandAltaWindXIdue2020Member" xlink:label="loc_nrg_AltaWindXandAltaWindXIdue2020Member_35064273BAECD9008D3AA51481DB9CC1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DA525FAB8E94B2EC7D13A51481DB0E82" xlink:to="loc_nrg_AltaWindXandAltaWindXIdue2020Member_35064273BAECD9008D3AA51481DB9CC1" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WestHoldingsCreditAgreementdue2023TrancheBMember" xlink:label="loc_nrg_WestHoldingsCreditAgreementdue2023TrancheBMember_03A27FD20C058423A060A51481DB9263" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DA525FAB8E94B2EC7D13A51481DB0E82" xlink:to="loc_nrg_WestHoldingsCreditAgreementdue2023TrancheBMember_03A27FD20C058423A060A51481DB9263" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WestHoldingsCreditAgreementMember" xlink:label="loc_nrg_WestHoldingsCreditAgreementMember_435A174205BAB0C11285A51481DB50C9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_DA525FAB8E94B2EC7D13A51481DB0E82" xlink:to="loc_nrg_WestHoldingsCreditAgreementMember_435A174205BAB0C11285A51481DB50C9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_D7A76B6E5EAC4655C672A51481DC6D42" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_D7A76B6E5EAC4655C672A51481DC6D42" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromMinorityShareholders" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_D6991C79FF5C68C21830A51481DC4FF1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_D6991C79FF5C68C21830A51481DC4FF1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ExtinguishmentOfDebtAmount" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_18D61AB16DEDAFB1A1C3A51481DCB640" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_18D61AB16DEDAFB1A1C3A51481DCB640" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_9305676FA3C3DB57D78BA51481DC733C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_9305676FA3C3DB57D78BA51481DC733C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_DFAFCC1DD44A7A8D8378A51481DCCEE5" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_DFAFCC1DD44A7A8D8378A51481DCCEE5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts" xlink:label="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_D28E0577B450F692763DA51481DC2A93" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_D28E0577B450F692763DA51481DC2A93" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_FE03F22A44F907FF85B5A51481DC1C9E" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_FE03F22A44F907FF85B5A51481DC1C9E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_C4CFCD986066068B4868A517863E00BA" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_C4CFCD986066068B4868A517863E00BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_32DB153B85FD9FDF43ECA51481DCD3E8" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_32DB153B85FD9FDF43ECA51481DCD3E8" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CreditFacilityMaximumBorrowingCapacityAmendment" xlink:label="loc_nrg_CreditFacilityMaximumBorrowingCapacityAmendment_053DADF43BE109099EE3A51481DCB540" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_nrg_CreditFacilityMaximumBorrowingCapacityAmendment_053DADF43BE109099EE3A51481DCB540" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_332AF817C319103478F9A51481DCB1B5" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3541A332A278C3C45518A51481DB5928" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_332AF817C319103478F9A51481DCB1B5" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/LongTermDebtLongTermDebtCorporateDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_04493F1DFAC27DC141EACEBD81CC246B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_DebtInstrumentTable_04493F1DFAC27DC141EACEBD81CC246B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_7112293FDCB0CE6654A0CF61F976C3CD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_04493F1DFAC27DC141EACEBD81CC246B" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_7112293FDCB0CE6654A0CF61F976C3CD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_AD15C58CA3D2636FFC5BCF61F97CACC7_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_7112293FDCB0CE6654A0CF61F976C3CD" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_AD15C58CA3D2636FFC5BCF61F97CACC7_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_AD15C58CA3D2636FFC5BCF61F97CACC7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_7112293FDCB0CE6654A0CF61F976C3CD" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_AD15C58CA3D2636FFC5BCF61F97CACC7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_0408135679A92FFF12BBCF622308783C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_AD15C58CA3D2636FFC5BCF61F97CACC7" xlink:to="loc_us-gaap_SubsequentEventMember_0408135679A92FFF12BBCF622308783C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_2FBFE0ECB59D01D4F0DBCEBD81CC1B4D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_04493F1DFAC27DC141EACEBD81CC246B" xlink:to="loc_us-gaap_StatementScenarioAxis_2FBFE0ECB59D01D4F0DBCEBD81CC1B4D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_67B027498C2BCE703EF1CEBD81CC13C0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_2FBFE0ECB59D01D4F0DBCEBD81CC1B4D" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_67B027498C2BCE703EF1CEBD81CC13C0_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_67B027498C2BCE703EF1CEBD81CC13C0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_2FBFE0ECB59D01D4F0DBCEBD81CC1B4D" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_67B027498C2BCE703EF1CEBD81CC13C0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioPreviouslyReportedMember" xlink:label="loc_us-gaap_ScenarioPreviouslyReportedMember_B43A424554D83F8CC2A0CEBD81CC4E0E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_67B027498C2BCE703EF1CEBD81CC13C0" xlink:to="loc_us-gaap_ScenarioPreviouslyReportedMember_B43A424554D83F8CC2A0CEBD81CC4E0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_10683C33BEBBE6FEDFF5CEBD81CCE0D8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_04493F1DFAC27DC141EACEBD81CC246B" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_10683C33BEBBE6FEDFF5CEBD81CCE0D8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_22EB29C5345194AA9EEACEBD81CC7C39_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_10683C33BEBBE6FEDFF5CEBD81CCE0D8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_22EB29C5345194AA9EEACEBD81CC7C39_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_22EB29C5345194AA9EEACEBD81CC7C39" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_10683C33BEBBE6FEDFF5CEBD81CCE0D8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_22EB29C5345194AA9EEACEBD81CC7C39" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_667952727571D2AF8F27CEBD81CCA15C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_22EB29C5345194AA9EEACEBD81CC7C39" xlink:to="loc_us-gaap_LetterOfCreditMember_667952727571D2AF8F27CEBD81CCA15C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_668D546EFFDD84E911EFCEBD81CC2E15" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_04493F1DFAC27DC141EACEBD81CC246B" xlink:to="loc_us-gaap_DebtInstrumentAxis_668D546EFFDD84E911EFCEBD81CC2E15" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_58AFB358B2FD53B6B556CEBD81CC2510_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_668D546EFFDD84E911EFCEBD81CC2E15" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_58AFB358B2FD53B6B556CEBD81CC2510_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_58AFB358B2FD53B6B556CEBD81CC2510" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_668D546EFFDD84E911EFCEBD81CC2E15" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_58AFB358B2FD53B6B556CEBD81CC2510" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_A3.5ConvertibleNotesdue2019Member" xlink:label="loc_nrg_A3.5ConvertibleNotesdue2019Member_FF0C37008B6476F470BACEBD81CC481A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_58AFB358B2FD53B6B556CEBD81CC2510" xlink:to="loc_nrg_A3.5ConvertibleNotesdue2019Member_FF0C37008B6476F470BACEBD81CC481A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldRevolvingCreditFacilityMember" xlink:label="loc_nrg_NRGYieldRevolvingCreditFacilityMember_57BE8166B92F5A7B6B48CEBD81CC5B08" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_58AFB358B2FD53B6B556CEBD81CC2510" xlink:to="loc_nrg_NRGYieldRevolvingCreditFacilityMember_57BE8166B92F5A7B6B48CEBD81CC5B08" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_A3.25ConvertibleNotesdue2020Member" xlink:label="loc_nrg_A3.25ConvertibleNotesdue2020Member_7AAE707B161AEA76804DCEBD81CC0F42" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_58AFB358B2FD53B6B556CEBD81CC2510" xlink:to="loc_nrg_A3.25ConvertibleNotesdue2020Member_7AAE707B161AEA76804DCEBD81CC0F42" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_961F92505CCFFE9C6439CEBD81CCF66B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_961F92505CCFFE9C6439CEBD81CCF66B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_9A3E84B40C35082D062BCEBD81CC8D42" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_9A3E84B40C35082D062BCEBD81CC8D42" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1CEEBBFF6A6D2A8DD4EDCEBD81CCFCCF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1CEEBBFF6A6D2A8DD4EDCEBD81CCFCCF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_ACFE8347575DBBDAE2D8CEBD81CCB280" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_ACFE8347575DBBDAE2D8CEBD81CCB280" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_2C464DC1FF6B578955FACEBD81CC1574" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_2C464DC1FF6B578955FACEBD81CC1574" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_4F6869995A741BB2F3DECF619E2D571E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_4F6869995A741BB2F3DECF619E2D571E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConvertibleDebt" xlink:label="loc_us-gaap_ConvertibleDebt_6658B8320EC03B2DB4EBCEBD81CCD13A" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_ConvertibleDebt_6658B8320EC03B2DB4EBCEBD81CCD13A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_7C4CAA5DBC7F035F50F3CEBD81CCD2C3" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_7C4CAA5DBC7F035F50F3CEBD81CCD2C3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_FF5F4CBCF210C751BE1FCEBD81CC8F27" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_FF5F4CBCF210C751BE1FCEBD81CC8F27" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_830E18D5A86803C4754DCEBD81CCF4C1" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FBA8BC08270BA14BC785CEBD81CC0AB1" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_830E18D5A86803C4754DCEBD81CCF4C1" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/LongTermDebtLongTermDebtDebtTableDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_02567ACB8C329F2532B6B4503B46E75C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_DebtInstrumentTable_02567ACB8C329F2532B6B4503B46E75C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_11B905684C7732B0B8ABB4503B46D05F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_02567ACB8C329F2532B6B4503B46E75C" xlink:to="loc_us-gaap_RangeAxis_11B905684C7732B0B8ABB4503B46D05F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_96B1442D4B4484823E3EB4503B4688C5_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_11B905684C7732B0B8ABB4503B46D05F" xlink:to="loc_us-gaap_RangeMember_96B1442D4B4484823E3EB4503B4688C5_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_96B1442D4B4484823E3EB4503B4688C5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_11B905684C7732B0B8ABB4503B46D05F" xlink:to="loc_us-gaap_RangeMember_96B1442D4B4484823E3EB4503B4688C5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_DE584603E91344210A7CB4503B464E2F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_96B1442D4B4484823E3EB4503B4688C5" xlink:to="loc_us-gaap_MinimumMember_DE584603E91344210A7CB4503B464E2F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_3DA8F133EEC01E5E6976B4503B46A2EA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_96B1442D4B4484823E3EB4503B4688C5" xlink:to="loc_us-gaap_MaximumMember_3DA8F133EEC01E5E6976B4503B46A2EA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_28DCD37E4CC6AB8DB3BAB4503B46313A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_02567ACB8C329F2532B6B4503B46E75C" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_28DCD37E4CC6AB8DB3BAB4503B46313A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_6DFCA2F47F08BBD8FB81B4503B4691F2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_28DCD37E4CC6AB8DB3BAB4503B46313A" xlink:to="loc_us-gaap_RelatedPartyDomain_6DFCA2F47F08BBD8FB81B4503B4691F2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_6DFCA2F47F08BBD8FB81B4503B4691F2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_28DCD37E4CC6AB8DB3BAB4503B46313A" xlink:to="loc_us-gaap_RelatedPartyDomain_6DFCA2F47F08BBD8FB81B4503B4691F2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_A59796FF6F240BCBC239B4503B4674E0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_02567ACB8C329F2532B6B4503B46E75C" xlink:to="loc_us-gaap_DebtInstrumentAxis_A59796FF6F240BCBC239B4503B4674E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_A59796FF6F240BCBC239B4503B4674E0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_A59796FF6F240BCBC239B4503B4674E0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_A5.375SeniorNotesduein2024Member" xlink:label="loc_nrg_A5.375SeniorNotesduein2024Member_25E907FF9833D68F5133B4503B46FEC0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_A5.375SeniorNotesduein2024Member_25E907FF9833D68F5133B4503B46FEC0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_A3.5ConvertibleNotesdue2019Member" xlink:label="loc_nrg_A3.5ConvertibleNotesdue2019Member_6BF054F3AB18289D6E9FB4503B4630E8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_A3.5ConvertibleNotesdue2019Member_6BF054F3AB18289D6E9FB4503B4630E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_E6F69A33EDF65AC27C6DB4503B46CFF0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_E6F69A33EDF65AC27C6DB4503B46CFF0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_A3.25ConvertibleNotesdue2020Member" xlink:label="loc_nrg_A3.25ConvertibleNotesdue2020Member_C2084C419643A15C4663B4503B46B2F6" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_A3.25ConvertibleNotesdue2020Member_C2084C419643A15C4663B4503B46B2F6" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindIleasefinancingarrangementdue2034Member" xlink:label="loc_nrg_AltaWindIleasefinancingarrangementdue2034Member_53C460BE3872C173599EB4503B4651EB" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaWindIleasefinancingarrangementdue2034Member_53C460BE3872C173599EB4503B4651EB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindIIleasefinancingarrangementdue2034Member" xlink:label="loc_nrg_AltaWindIIleasefinancingarrangementdue2034Member_034B23679543FB0CF9CAB4503B462FCB" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaWindIIleasefinancingarrangementdue2034Member_034B23679543FB0CF9CAB4503B462FCB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindIIIleasefinancingarrangementdue2034Member" xlink:label="loc_nrg_AltaWindIIIleasefinancingarrangementdue2034Member_306357D3A4CB58B9692FB4503B4641EB" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaWindIIIleasefinancingarrangementdue2034Member_306357D3A4CB58B9692FB4503B4641EB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindIVleasefinancingarrangementdue2034Member" xlink:label="loc_nrg_AltaWindIVleasefinancingarrangementdue2034Member_70DECAC51CE62660972AB4503B460972" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaWindIVleasefinancingarrangementdue2034Member_70DECAC51CE62660972AB4503B460972" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindVleasefinancingarrangementdue2035Member" xlink:label="loc_nrg_AltaWindVleasefinancingarrangementdue2035Member_3D6E376B310C40C507A4B4503B469F22" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaWindVleasefinancingarrangementdue2035Member_3D6E376B310C40C507A4B4503B469F22" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindXdue2020Member" xlink:label="loc_nrg_AltaWindXdue2020Member_ABA67A54E298545B3347B4503B4616F1" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaWindXdue2020Member_ABA67A54E298545B3347B4503B4616F1" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindXIdue2020Member" xlink:label="loc_nrg_AltaWindXIdue2020Member_A8F1C253F387DCC19F05B4503B461A2C" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaWindXIdue2020Member_A8F1C253F387DCC19F05B4503B461A2C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaRealtyInvestmentsdue2031Member" xlink:label="loc_nrg_AltaRealtyInvestmentsdue2031Member_020068BA9AF7E39F0D6CB4503B463D48" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaRealtyInvestmentsdue2031Member_020068BA9AF7E39F0D6CB4503B463D48" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaWindAssetManagementdue2031Member" xlink:label="loc_nrg_AltaWindAssetManagementdue2031Member_023E215345E90DFA0A8FB4503B466019" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AltaWindAssetManagementdue2031Member_023E215345E90DFA0A8FB4503B466019" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WestHoldingsCreditAgreementMember" xlink:label="loc_nrg_WestHoldingsCreditAgreementMember_D9B0D1EE055314321A03B4503B463ABF" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_WestHoldingsCreditAgreementMember_D9B0D1EE055314321A03B4503B463ABF" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WestHoldingsCreditAgreementdue2023TrancheAMember" xlink:label="loc_nrg_WestHoldingsCreditAgreementdue2023TrancheAMember_691016D5DF136B04EFAAB4503B468417" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_WestHoldingsCreditAgreementdue2023TrancheAMember_691016D5DF136B04EFAAB4503B468417" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MarshLandingTermLoanFacilityMember" xlink:label="loc_nrg_MarshLandingTermLoanFacilityMember_E1127E2E98B178213A67B4503B461525" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_MarshLandingTermLoanFacilityMember_E1127E2E98B178213A67B4503B461525" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WalnutCreekEnergyLLCduein2023Member" xlink:label="loc_nrg_WalnutCreekEnergyLLCduein2023Member_1A4D0CC0EFDF3334E34CB4503B46DCAA" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_WalnutCreekEnergyLLCduein2023Member_1A4D0CC0EFDF3334E34CB4503B46DCAA" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TapestryWindLLCduein2021Member" xlink:label="loc_nrg_TapestryWindLLCduein2021Member_D7B0C01FCD0685FCBF7EB4503B465E04" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_TapestryWindLLCduein2021Member_D7B0C01FCD0685FCBF7EB4503B465E04" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesMember" xlink:label="loc_nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesMember_9D2A256EA05B1336DFDFB4503B462DC0" xlink:type="locator" />
    <definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesMember_9D2A256EA05B1336DFDFB4503B462DC0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LaredoRidgeWindLLCduein2026Member" xlink:label="loc_nrg_LaredoRidgeWindLLCduein2026Member_BCBF2CD0E748A787B2E7B4503B463B90" xlink:type="locator" />
    <definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_LaredoRidgeWindLLCduein2026Member_BCBF2CD0E748A787B2E7B4503B463B90" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BorregoMember" xlink:label="loc_nrg_BorregoMember_2485EC9347F4C716C733B4503B461DC0" xlink:type="locator" />
    <definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_BorregoMember_2485EC9347F4C716C733B4503B461DC0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SouthTrentFinancingAgreementMember" xlink:label="loc_nrg_SouthTrentFinancingAgreementMember_1538E5B5B7A88CFFB175B4503B46C1EB" xlink:type="locator" />
    <definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_SouthTrentFinancingAgreementMember_1538E5B5B7A88CFFB175B4503B46C1EB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AvraValleyFinancingAgreementMember" xlink:label="loc_nrg_AvraValleyFinancingAgreementMember_1D1C2023D21FBEB97F72B4503B46B659" xlink:type="locator" />
    <definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AvraValleyFinancingAgreementMember_1D1C2023D21FBEB97F72B4503B46B659" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_HighDesertFacilityMember" xlink:label="loc_nrg_HighDesertFacilityMember_D712E0FBE3738747D818B4503B46CE25" xlink:type="locator" />
    <definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_HighDesertFacilityMember_D712E0FBE3738747D818B4503B46CE25" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WCEPHoldingsLLCduein2023Member" xlink:label="loc_nrg_WCEPHoldingsLLCduein2023Member_CCD22267BE20D6966141B4503B468EFB" xlink:type="locator" />
    <definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_WCEPHoldingsLLCduein2023Member_CCD22267BE20D6966141B4503B468EFB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_RoadrunnerFinancingAgreementMember" xlink:label="loc_nrg_RoadrunnerFinancingAgreementMember_0E680AB9F68FC41030C4B4503B46FB15" xlink:type="locator" />
    <definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_RoadrunnerFinancingAgreementMember_0E680AB9F68FC41030C4B4503B46FB15" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_KansasSouthFacilitydue2031Member" xlink:label="loc_nrg_KansasSouthFacilitydue2031Member_23DA62F7092A59BA5F8BB4503B46F752" xlink:type="locator" />
    <definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_KansasSouthFacilitydue2031Member_23DA62F7092A59BA5F8BB4503B46F752" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_KansasSouthMember" xlink:label="loc_nrg_KansasSouthMember_B82AB0C08A136B59A60EB4503B469AFB" xlink:type="locator" />
    <definitionArc order="28" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_KansasSouthMember_B82AB0C08A136B59A60EB4503B469AFB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgSolarBlytheLlcCreditAgreementDue2028Member" xlink:label="loc_nrg_NrgSolarBlytheLlcCreditAgreementDue2028Member_8EBF09548563F01147D6B4503B65164D" xlink:type="locator" />
    <definitionArc order="29" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_NrgSolarBlytheLlcCreditAgreementDue2028Member_8EBF09548563F01147D6B4503B65164D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PFMGFinancingAgreementMember" xlink:label="loc_nrg_PFMGFinancingAgreementMember_9732C703C9347020B608B4503B65DAED" xlink:type="locator" />
    <definitionArc order="30" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_PFMGFinancingAgreementMember_9732C703C9347020B608B4503B65DAED" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PFMGDGSolarProjectsMember" xlink:label="loc_nrg_PFMGDGSolarProjectsMember_67BEB2E93569B0A925CFB4503B65F6C4" xlink:type="locator" />
    <definitionArc order="31" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_PFMGDGSolarProjectsMember_67BEB2E93569B0A925CFB4503B65F6C4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGEnergyCenterPrincetonLLCdue2017Member" xlink:label="loc_nrg_NRGEnergyCenterPrincetonLLCdue2017Member_A5EDE1942E58A21A9538B4503B65C6CB" xlink:type="locator" />
    <definitionArc order="32" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_NRGEnergyCenterPrincetonLLCdue2017Member_A5EDE1942E58A21A9538B4503B65C6CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProjectMember" xlink:label="loc_us-gaap_ProjectMember_5F3BED9ACA0F6F9F59D5B4503B65AED4" xlink:type="locator" />
    <definitionArc order="33" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_us-gaap_ProjectMember_5F3BED9ACA0F6F9F59D5B4503B65AED4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WestHoldingsCreditAgreementdue2023TrancheBMember" xlink:label="loc_nrg_WestHoldingsCreditAgreementdue2023TrancheBMember_4A347D5BE79413A10268B4503B65BB05" xlink:type="locator" />
    <definitionArc order="34" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_WestHoldingsCreditAgreementdue2023TrancheBMember_4A347D5BE79413A10268B4503B65BB05" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MarshLandingTrancheAdueDecember2017Member" xlink:label="loc_nrg_MarshLandingTrancheAdueDecember2017Member_9B6010DFE7868CEA5684B4503B65F3CC" xlink:type="locator" />
    <definitionArc order="35" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_MarshLandingTrancheAdueDecember2017Member_9B6010DFE7868CEA5684B4503B65F3CC" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MarshLandingTrancheBdue2023Member" xlink:label="loc_nrg_MarshLandingTrancheBdue2023Member_16F26B88C437BB783903B4503B65E95E" xlink:type="locator" />
    <definitionArc order="36" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_MarshLandingTrancheBdue2023Member_16F26B88C437BB783903B4503B65E95E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AlpineFinancingAgreementDue2022Member" xlink:label="loc_nrg_AlpineFinancingAgreementDue2022Member_61D0BFEFF7721E0D53ABB4503B6537FA" xlink:type="locator" />
    <definitionArc order="37" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_AlpineFinancingAgreementDue2022Member_61D0BFEFF7721E0D53ABB4503B6537FA" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesDue2017Member" xlink:label="loc_nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesDue2017Member_02C9EE7D9EB199555709B4503B655B13" xlink:type="locator" />
    <definitionArc order="38" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesDue2017Member_02C9EE7D9EB199555709B4503B655B13" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesDue2025Member" xlink:label="loc_nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesDue2025Member_457973B402DB41A9E7D3B4503B65DD74" xlink:type="locator" />
    <definitionArc order="39" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_NrgEnergyCenterMinneapolisLlcSeniorSecuredNotesDue2025Member_457973B402DB41A9E7D3B4503B65DD74" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BorregoFinancingAgreementDue2024Member" xlink:label="loc_nrg_BorregoFinancingAgreementDue2024Member_23B74E569A1420DDD239B4503B65EF77" xlink:type="locator" />
    <definitionArc order="40" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_BorregoFinancingAgreementDue2024Member_23B74E569A1420DDD239B4503B65EF77" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BorregoFinancingAgreementDue2038Member" xlink:label="loc_nrg_BorregoFinancingAgreementDue2038Member_E2F2B63B2137FA383C1AB4503B65CCBD" xlink:type="locator" />
    <definitionArc order="41" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_BorregoFinancingAgreementDue2038Member_E2F2B63B2137FA383C1AB4503B65CCBD" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_HighDesertFacilityDue2033Member" xlink:label="loc_nrg_HighDesertFacilityDue2033Member_4420494BD86E72EF7565B4503B655A5D" xlink:type="locator" />
    <definitionArc order="42" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_HighDesertFacilityDue2033Member_4420494BD86E72EF7565B4503B655A5D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TAHighDesertdue2023Member" xlink:label="loc_nrg_TAHighDesertdue2023Member_A1720A4F6FD623B7017EB4503B65F87F" xlink:type="locator" />
    <definitionArc order="43" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_F2B06003D200050F49B0B4503B46DD77" xlink:to="loc_nrg_TAHighDesertdue2023Member_A1720A4F6FD623B7017EB4503B65F87F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SeniorNotes" xlink:label="loc_us-gaap_SeniorNotes_10017044436C98ABC1E4B4503B6518ED" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_SeniorNotes_10017044436C98ABC1E4B4503B6518ED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_C994D1098B066D66E6F5B4503B65ED82" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_LongTermDebt_C994D1098B066D66E6F5B4503B65ED82" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_AD73438B9680398F47D7B4503B658953" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_AD73438B9680398F47D7B4503B658953" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_C92D71462813B044B081B4503B7595F3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_LongTermDebtCurrent_C92D71462813B044B081B4503B7595F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_14575E1040D6819EA82BB4503B75BE6A" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_14575E1040D6819EA82BB4503B75BE6A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_6AE477530B8CA6B6DE77B4503B756FAD" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_6AE477530B8CA6B6DE77B4503B756FAD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_49F6711F31CE22596385B4503B75D3ED" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_49F6711F31CE22596385B4503B75D3ED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_6E1517EE42A0F4564D01B4503B75DD8E" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_71D3876646F2D3FE2BB3B4503B65652C" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_6E1517EE42A0F4564D01B4503B75DD8E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/LongTermDebtLongTermDebtJanuary2015DropDownsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_0CAC3B087B73F6F4A4ECCEBD81BD4CD1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:to="loc_us-gaap_CounterpartyNameAxis_0CAC3B087B73F6F4A4ECCEBD81BD4CD1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_BB00F322AC3474CECA5BCEBD81BDD758_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CounterpartyNameAxis_0CAC3B087B73F6F4A4ECCEBD81BD4CD1" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_BB00F322AC3474CECA5BCEBD81BDD758_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_BB00F322AC3474CECA5BCEBD81BDD758" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CounterpartyNameAxis_0CAC3B087B73F6F4A4ECCEBD81BD4CD1" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_BB00F322AC3474CECA5BCEBD81BDD758" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WCEPHoldingsLLCMember" xlink:label="loc_nrg_WCEPHoldingsLLCMember_79833E79E75132B4E53DCEBD81BD6581" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_BB00F322AC3474CECA5BCEBD81BDD758" xlink:to="loc_nrg_WCEPHoldingsLLCMember_79833E79E75132B4E53DCEBD81BD6581" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_11B6B160081F79EE7320CEBD81BD7513" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:to="loc_us-gaap_RangeAxis_11B6B160081F79EE7320CEBD81BD7513" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_D267E12D2F0A48C9E8C8CEBD81BD54A4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_11B6B160081F79EE7320CEBD81BD7513" xlink:to="loc_us-gaap_RangeMember_D267E12D2F0A48C9E8C8CEBD81BD54A4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_D267E12D2F0A48C9E8C8CEBD81BD54A4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_11B6B160081F79EE7320CEBD81BD7513" xlink:to="loc_us-gaap_RangeMember_D267E12D2F0A48C9E8C8CEBD81BD54A4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_96CCF16948A1849FD5DFCEBD81BDB879" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_D267E12D2F0A48C9E8C8CEBD81BD54A4" xlink:to="loc_us-gaap_MinimumMember_96CCF16948A1849FD5DFCEBD81BDB879" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_4CB813AF3B1EE887B0F1CEBD81BDCE51" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_D267E12D2F0A48C9E8C8CEBD81BD54A4" xlink:to="loc_us-gaap_MaximumMember_4CB813AF3B1EE887B0F1CEBD81BDCE51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_4E095E19DD9BB5A571E4CEBD81BDCCB3" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_4E095E19DD9BB5A571E4CEBD81BDCCB3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_D871852FB2A7914BA4FCCEBD81BDE575_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4E095E19DD9BB5A571E4CEBD81BDCCB3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_D871852FB2A7914BA4FCCEBD81BDE575_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_D871852FB2A7914BA4FCCEBD81BDE575" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4E095E19DD9BB5A571E4CEBD81BDCCB3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_D871852FB2A7914BA4FCCEBD81BDE575" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_F568566D05F91ABCE216CEBD81BDD751" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_D871852FB2A7914BA4FCCEBD81BDE575" xlink:to="loc_us-gaap_InterestRateSwapMember_F568566D05F91ABCE216CEBD81BDD751" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_0C5E40A8EC6130023914CEBD81BDA7A0" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:to="loc_dei_LegalEntityAxis_0C5E40A8EC6130023914CEBD81BDA7A0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_C61B63632006FC6390EACEBD81BD6BA0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0C5E40A8EC6130023914CEBD81BDA7A0" xlink:to="loc_dei_EntityDomain_C61B63632006FC6390EACEBD81BD6BA0_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_C61B63632006FC6390EACEBD81BD6BA0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0C5E40A8EC6130023914CEBD81BDA7A0" xlink:to="loc_dei_EntityDomain_C61B63632006FC6390EACEBD81BD6BA0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGWindLLCMember" xlink:label="loc_nrg_NRGWindLLCMember_2E28E439BCB035A2244CCEBD81BD9D6F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_C61B63632006FC6390EACEBD81BD6BA0" xlink:to="loc_nrg_NRGWindLLCMember_2E28E439BCB035A2244CCEBD81BD9D6F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LaredoRidgeMember" xlink:label="loc_nrg_LaredoRidgeMember_66C159C6E17B3F3E7D55CEBD81BDF3B4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_C61B63632006FC6390EACEBD81BD6BA0" xlink:to="loc_nrg_LaredoRidgeMember_66C159C6E17B3F3E7D55CEBD81BDF3B4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WCEPHoldingsLLCMember" xlink:label="loc_nrg_WCEPHoldingsLLCMember_BD15F04DE51FF24739F6CEBD81BD3C2A" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_C61B63632006FC6390EACEBD81BD6BA0" xlink:to="loc_nrg_WCEPHoldingsLLCMember_BD15F04DE51FF24739F6CEBD81BD3C2A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WalnutCreekMember" xlink:label="loc_nrg_WalnutCreekMember_49110092E9BD814A7C78CEBD81BD9941" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_C61B63632006FC6390EACEBD81BD6BA0" xlink:to="loc_nrg_WalnutCreekMember_49110092E9BD814A7C78CEBD81BD9941" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DebtInstrumentPeriodAxis" xlink:label="loc_nrg_DebtInstrumentPeriodAxis_D59687AD20EFD0CE5F0CCEBD81BDEFDD" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:to="loc_nrg_DebtInstrumentPeriodAxis_D59687AD20EFD0CE5F0CCEBD81BDEFDD" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DebtInstrumentPeriodDomain" xlink:label="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_DebtInstrumentPeriodAxis_D59687AD20EFD0CE5F0CCEBD81BDEFDD" xlink:to="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DebtInstrumentPeriodDomain" xlink:label="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_DebtInstrumentPeriodAxis_D59687AD20EFD0CE5F0CCEBD81BDEFDD" xlink:to="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_December172014toDecember312018Member" xlink:label="loc_nrg_December172014toDecember312018Member_10CF020274056EB4DA18CEBD81BD2F7D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:to="loc_nrg_December172014toDecember312018Member_10CF020274056EB4DA18CEBD81BD2F7D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_January12019toDecember312023Member" xlink:label="loc_nrg_January12019toDecember312023Member_78D001251B97E83394E3CEBD81BDE04A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:to="loc_nrg_January12019toDecember312023Member_78D001251B97E83394E3CEBD81BDE04A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_January12024toMarch312028Member" xlink:label="loc_nrg_January12024toMarch312028Member_ABB356CF217C3D9E4247CEBD81BD442C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:to="loc_nrg_January12024toMarch312028Member_ABB356CF217C3D9E4247CEBD81BD442C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_November122014toDecember202018Member" xlink:label="loc_nrg_November122014toDecember202018Member_FFA978C4544141441FC3CEBD81BD1A24" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:to="loc_nrg_November122014toDecember202018Member_FFA978C4544141441FC3CEBD81BD1A24" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_December212018toDecember312021Member" xlink:label="loc_nrg_December212018toDecember312021Member_AAA9ED2C592644FF0B4DCEBD81BDD3B7" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:to="loc_nrg_December212018toDecember312021Member_AAA9ED2C592644FF0B4DCEBD81BDD3B7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_October212014toSeptember302018Member" xlink:label="loc_nrg_October212014toSeptember302018Member_2019A6985F05EF64AC7FCEBD81BD61D7" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:to="loc_nrg_October212014toSeptember302018Member_2019A6985F05EF64AC7FCEBD81BD61D7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_October12018toSeptember302022Member" xlink:label="loc_nrg_October12018toSeptember302022Member_F23FFA2E4894C4CEE8BBCEBD81BD3239" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:to="loc_nrg_October12018toSeptember302022Member_F23FFA2E4894C4CEE8BBCEBD81BD3239" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_October12022toMay312023Member" xlink:label="loc_nrg_October12022toMay312023Member_B8B9C347F1A4D492A47FCEBD81BD92BD" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_DebtInstrumentPeriodDomain_74DA2A47B62FD2876509CEBD81BD10DE" xlink:to="loc_nrg_October12022toMay312023Member_B8B9C347F1A4D492A47FCEBD81BD92BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_329F6C94A8B59755804BCEBD81BD7654" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_329F6C94A8B59755804BCEBD81BD7654" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ECDB10DF14DABAD8EBDBCEBD81BD500A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_329F6C94A8B59755804BCEBD81BD7654" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ECDB10DF14DABAD8EBDBCEBD81BD500A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ECDB10DF14DABAD8EBDBCEBD81BD500A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_329F6C94A8B59755804BCEBD81BD7654" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ECDB10DF14DABAD8EBDBCEBD81BD500A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CashGrantLoanMember" xlink:label="loc_nrg_CashGrantLoanMember_A667A51F35CD54194A0ACEBD81BD317C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ECDB10DF14DABAD8EBDBCEBD81BD500A" xlink:to="loc_nrg_CashGrantLoanMember_A667A51F35CD54194A0ACEBD81BD317C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WorkingCapitalFacilityMember" xlink:label="loc_nrg_WorkingCapitalFacilityMember_7CA626A31F333D185F64CEBD81BD759F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ECDB10DF14DABAD8EBDBCEBD81BD500A" xlink:to="loc_nrg_WorkingCapitalFacilityMember_7CA626A31F333D185F64CEBD81BD759F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_C2B45E492ABD6C1F07D3CEBD81BDE959" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ECDB10DF14DABAD8EBDBCEBD81BD500A" xlink:to="loc_us-gaap_LetterOfCreditMember_C2B45E492ABD6C1F07D3CEBD81BDE959" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_14CE2BFF243197296D5BCEBD81BDA429" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_13857DC3636DE4403331CEBD81BD2F16" xlink:to="loc_us-gaap_DebtInstrumentAxis_14CE2BFF243197296D5BCEBD81BDA429" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B7A0DE67C0D3670F3120CEBD81BD92E6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_14CE2BFF243197296D5BCEBD81BDA429" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B7A0DE67C0D3670F3120CEBD81BD92E6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B7A0DE67C0D3670F3120CEBD81BD92E6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_14CE2BFF243197296D5BCEBD81BDA429" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B7A0DE67C0D3670F3120CEBD81BD92E6" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LaredoRidgeWindLLCduein2026Member" xlink:label="loc_nrg_LaredoRidgeWindLLCduein2026Member_CC7852F473C3403630BBCEBD81BDEF03" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B7A0DE67C0D3670F3120CEBD81BD92E6" xlink:to="loc_nrg_LaredoRidgeWindLLCduein2026Member_CC7852F473C3403630BBCEBD81BDEF03" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TapestryWindLLCduein2021Member" xlink:label="loc_nrg_TapestryWindLLCduein2021Member_0A5ACB41FBFCF7C1608BCEBD81BDFC62" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B7A0DE67C0D3670F3120CEBD81BD92E6" xlink:to="loc_nrg_TapestryWindLLCduein2021Member_0A5ACB41FBFCF7C1608BCEBD81BDFC62" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WalnutCreekEnergyLLCduein2023Member" xlink:label="loc_nrg_WalnutCreekEnergyLLCduein2023Member_D0536F39D30CF2B7F65ACEBD81BDED61" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B7A0DE67C0D3670F3120CEBD81BD92E6" xlink:to="loc_nrg_WalnutCreekEnergyLLCduein2023Member_D0536F39D30CF2B7F65ACEBD81BDED61" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WCEPHoldingsLLCduein2023Member" xlink:label="loc_nrg_WCEPHoldingsLLCduein2023Member_6525FB47CDF4BB0590DACEBD81BD83AD" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B7A0DE67C0D3670F3120CEBD81BD92E6" xlink:to="loc_nrg_WCEPHoldingsLLCduein2023Member_6525FB47CDF4BB0590DACEBD81BD83AD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_742B22F7FB60F5F5F077CEBD81BD1245" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_LongTermDebt_742B22F7FB60F5F5F077CEBD81BD1245" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9D403B089B35C0356B03CEBD81BDA3D4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9D403B089B35C0356B03CEBD81BDA3D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_49C0B7624EC9B485AB90CEBD81BD60C7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_49C0B7624EC9B485AB90CEBD81BD60C7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CreditFacilityMaximumBorrowingCapacityAmendment" xlink:label="loc_nrg_CreditFacilityMaximumBorrowingCapacityAmendment_18499049E82B4922C9EDCEBD81BD772F" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_nrg_CreditFacilityMaximumBorrowingCapacityAmendment_18499049E82B4922C9EDCEBD81BD772F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_A1D96F15A83594F00A73CEBD81BDF579" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_A1D96F15A83594F00A73CEBD81BDF579" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_94665959FE0DD42B3001CEBD81BD5CAA" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_94665959FE0DD42B3001CEBD81BD5CAA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_579083CE8AF92B7A172CCEBD81BD68F8" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_579083CE8AF92B7A172CCEBD81BD68F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid" xlink:label="loc_us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid_B82C28BCA453FA625AE1CEBD81BD58CA" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid_B82C28BCA453FA625AE1CEBD81BD58CA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtIssuanceCosts" xlink:label="loc_us-gaap_DebtIssuanceCosts_CD4F3C77EA1710CF9401CEBD81BD6B00" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_DebtIssuanceCosts_CD4F3C77EA1710CF9401CEBD81BD6B00" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_F632DC1D8E819F82DC3DCEBD81BD0CE6" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_F632DC1D8E819F82DC3DCEBD81BD0CE6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_A2C0E4F1379A1DDBAC81CEBD81BDF293" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_A2C0E4F1379A1DDBAC81CEBD81BDF293" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PercentageOfDebtHedgedByInterestRateDerivatives" xlink:label="loc_us-gaap_PercentageOfDebtHedgedByInterestRateDerivatives_834137652A35E06C1CC7CEBD81BDEE85" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_PercentageOfDebtHedgedByInterestRateDerivatives_834137652A35E06C1CC7CEBD81BDEE85" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFixedInterestRate" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_48DB7D253306CDDD5E0DCEBD81BD3A44" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_48DB7D253306CDDD5E0DCEBD81BD3A44" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeForwardInterestRate" xlink:label="loc_us-gaap_DerivativeForwardInterestRate_51E78578E2C111925FECCEBD81BDAC8E" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_DerivativeForwardInterestRate_51E78578E2C111925FECCEBD81BDAC8E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="loc_us-gaap_RepaymentsOfDebt_84B04362434C2169E522CEBD81BDD4BE" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_63B746532F7E0111CE73CEBD81BD8A77" xlink:to="loc_us-gaap_RepaymentsOfDebt_84B04362434C2169E522CEBD81BDD4BE" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/LongTermDebtTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/NatureOfBusiness" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/NatureOfBusinessDetails" xlink:type="extended">
    <loc xlink:href="nrg-20150930.xsd#nrg_BasisofPresentationLineItems" xlink:label="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:type="locator" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NatureOfBusinessTable" xlink:label="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_05AE834E5D8BA2057891CE2228935FB5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:to="loc_us-gaap_StatementClassOfStockAxis_05AE834E5D8BA2057891CE2228935FB5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_11D94831A7201124C40CCE2228935DF2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_05AE834E5D8BA2057891CE2228935FB5" xlink:to="loc_us-gaap_ClassOfStockDomain_11D94831A7201124C40CCE2228935DF2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_11D94831A7201124C40CCE2228935DF2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_05AE834E5D8BA2057891CE2228935FB5" xlink:to="loc_us-gaap_ClassOfStockDomain_11D94831A7201124C40CCE2228935DF2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_65B6045F0FEA33A922B4CE22289323C6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_11D94831A7201124C40CCE2228935DF2" xlink:to="loc_us-gaap_CommonClassAMember_65B6045F0FEA33A922B4CE22289323C6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaap_CommonClassCMember_0B89D05738A929ABA58BCE222893EDCC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_11D94831A7201124C40CCE2228935DF2" xlink:to="loc_us-gaap_CommonClassCMember_0B89D05738A929ABA58BCE222893EDCC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermContractForPurchaseOfElectricPowerAxis" xlink:label="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerAxis_5D7C0B9C8A8A1CACF0B6CE222893D1A6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:to="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerAxis_5D7C0B9C8A8A1CACF0B6CE222893D1A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermContractForPurchaseOfElectricPowerDomain" xlink:label="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerDomain_188400D4D3434B8D70B6CE222893AB43_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerAxis_5D7C0B9C8A8A1CACF0B6CE222893D1A6" xlink:to="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerDomain_188400D4D3434B8D70B6CE222893AB43_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermContractForPurchaseOfElectricPowerDomain" xlink:label="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerDomain_188400D4D3434B8D70B6CE222893AB43" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerAxis_5D7C0B9C8A8A1CACF0B6CE222893D1A6" xlink:to="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerDomain_188400D4D3434B8D70B6CE222893AB43" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SouthernCaliforniaEdisonMember" xlink:label="loc_nrg_SouthernCaliforniaEdisonMember_4F967B34B8AD93782F6FCE222893E29D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerDomain_188400D4D3434B8D70B6CE222893AB43" xlink:to="loc_nrg_SouthernCaliforniaEdisonMember_4F967B34B8AD93782F6FCE222893E29D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PacificGasandElectricMember" xlink:label="loc_nrg_PacificGasandElectricMember_2095EFA449AB6722D896CE22289308B8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermContractForPurchaseOfElectricPowerDomain_188400D4D3434B8D70B6CE222893AB43" xlink:to="loc_nrg_PacificGasandElectricMember_2095EFA449AB6722D896CE22289308B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_61BC8F62C3FAD29EF172CE22289364B1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_61BC8F62C3FAD29EF172CE22289364B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_A81918D661C6E0420DC8CE2228937D5A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_61BC8F62C3FAD29EF172CE22289364B1" xlink:to="loc_us-gaap_RelatedPartyDomain_A81918D661C6E0420DC8CE2228937D5A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_A81918D661C6E0420DC8CE2228937D5A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_61BC8F62C3FAD29EF172CE22289364B1" xlink:to="loc_us-gaap_RelatedPartyDomain_A81918D661C6E0420DC8CE2228937D5A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgMember" xlink:label="loc_nrg_NrgMember_080954FD55B5577CB79ACE2228931B85" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_A81918D661C6E0420DC8CE2228937D5A" xlink:to="loc_nrg_NrgMember_080954FD55B5577CB79ACE2228931B85" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9EA1C47CA6A2E17AF870CE22289342F3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9EA1C47CA6A2E17AF870CE22289342F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C213413F0FEE1ADFB21CCE222893FEE3_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9EA1C47CA6A2E17AF870CE22289342F3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C213413F0FEE1ADFB21CCE222893FEE3_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C213413F0FEE1ADFB21CCE222893FEE3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9EA1C47CA6A2E17AF870CE22289342F3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C213413F0FEE1ADFB21CCE222893FEE3" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_June2014DropDownAssetsMember" xlink:label="loc_nrg_June2014DropDownAssetsMember_223A26A32A211EB9BC9BCE222893D8BA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C213413F0FEE1ADFB21CCE222893FEE3" xlink:to="loc_nrg_June2014DropDownAssetsMember_223A26A32A211EB9BC9BCE222893D8BA" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_January2015DropDownAssetsMember" xlink:label="loc_nrg_January2015DropDownAssetsMember_1EF4E0C163B363FFE12CCE222893DBC4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_C213413F0FEE1ADFB21CCE222893FEE3" xlink:to="loc_nrg_January2015DropDownAssetsMember_1EF4E0C163B363FFE12CCE222893DBC4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_924BA465586A6B2579FBCE222893E3E9" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:to="loc_dei_LegalEntityAxis_924BA465586A6B2579FBCE222893E3E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_924BA465586A6B2579FBCE222893E3E9" xlink:to="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_924BA465586A6B2579FBCE222893E3E9" xlink:to="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldMember" xlink:label="loc_nrg_NRGYieldMember_9A5C7F244802185B3528CE222893A637" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_NRGYieldMember_9A5C7F244802185B3528CE222893A637" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgYieldIncMember" xlink:label="loc_nrg_NrgYieldIncMember_55EBA58479F7848B9697CE22289373E6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_NrgYieldIncMember_55EBA58479F7848B9697CE22289373E6" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldLLCMember" xlink:label="loc_nrg_NRGYieldLLCMember_D688863DE5617B0FE33DCE222893E350" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_NRGYieldLLCMember_D688863DE5617B0FE33DCE222893E350" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgMember" xlink:label="loc_nrg_NrgMember_AF0C5CEDCE1B8ED48637CE2228930AF8" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_NrgMember_AF0C5CEDCE1B8ED48637CE2228930AF8" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_GenConnMiddletownMember" xlink:label="loc_nrg_GenConnMiddletownMember_26445F5F247EA1B68D91CE222893F522" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_GenConnMiddletownMember_26445F5F247EA1B68D91CE222893F522" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_GenConnDevonMember" xlink:label="loc_nrg_GenConnDevonMember_2175047DD833D110FC96CE22289362EC" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_GenConnDevonMember_2175047DD833D110FC96CE22289362EC" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MarshLandingMember" xlink:label="loc_nrg_MarshLandingMember_091C5880A4DBEC52B4F8CE222893F284" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_MarshLandingMember_091C5880A4DBEC52B4F8CE222893F284" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ElSegundoMember" xlink:label="loc_nrg_ElSegundoMember_C9D39369CB95AE70AC43CE222893FF0E" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_ElSegundoMember_C9D39369CB95AE70AC43CE222893FF0E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WalnutCreekMember" xlink:label="loc_nrg_WalnutCreekMember_B721F8EAC54F9FEF09ACCE22289383F2" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_WalnutCreekMember_B721F8EAC54F9FEF09ACCE22289383F2" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AlpineMember" xlink:label="loc_nrg_AlpineMember_ED2BFFB1E8876D7BC10CCE222893F8C7" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AlpineMember_ED2BFFB1E8876D7BC10CCE222893F8C7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AvenalMember" xlink:label="loc_nrg_AvenalMember_D3614B5E2B568BC904C8CE222893697D" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AvenalMember_D3614B5E2B568BC904C8CE222893697D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AvraValleyMember" xlink:label="loc_nrg_AvraValleyMember_9B30E28B1D1126D61574CE222893972F" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AvraValleyMember_9B30E28B1D1126D61574CE222893972F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgSolarBlytheLlcMember" xlink:label="loc_nrg_NrgSolarBlytheLlcMember_6C75632AD5C5A06129B7CE2228939726" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_NrgSolarBlytheLlcMember_6C75632AD5C5A06129B7CE2228939726" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BorregoMember" xlink:label="loc_nrg_BorregoMember_14AA063411D2C0279D9ECE2228938FE8" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_BorregoMember_14AA063411D2C0279D9ECE2228938FE8" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgSolarRoadrunnerLlcMember" xlink:label="loc_nrg_NrgSolarRoadrunnerLlcMember_E1B526917E64B0D4F164CE22289303BF" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_NrgSolarRoadrunnerLlcMember_E1B526917E64B0D4F164CE22289303BF" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CvsrMember" xlink:label="loc_nrg_CvsrMember_D94F88EA2733F47D2E0CCE2228939AE7" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_CvsrMember_D94F88EA2733F47D2E0CCE2228939AE7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_KansasSouthMember" xlink:label="loc_nrg_KansasSouthMember_9177294DF43C4F0D350DCE2228933F7D" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_KansasSouthMember_9177294DF43C4F0D350DCE2228933F7D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaHighDesertLlcMember" xlink:label="loc_nrg_TaHighDesertLlcMember_176FBAE5B6191C084F81CE222893735A" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_TaHighDesertLlcMember_176FBAE5B6191C084F81CE222893735A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DesertSunlightMember" xlink:label="loc_nrg_DesertSunlightMember_D3DE8644B1F9E867208ECE2228937659" xlink:type="locator" />
    <definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_DesertSunlightMember_D3DE8644B1F9E867208ECE2228937659" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AZDGSolarProjectsMember" xlink:label="loc_nrg_AZDGSolarProjectsMember_2A2B2D37B36962C907B3CE2228936CAB" xlink:type="locator" />
    <definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AZDGSolarProjectsMember_2A2B2D37B36962C907B3CE2228936CAB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PFMGDGSolarProjectsMember" xlink:label="loc_nrg_PFMGDGSolarProjectsMember_2CC4805B10DCA24CE218CE222893587F" xlink:type="locator" />
    <definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_PFMGDGSolarProjectsMember_2CC4805B10DCA24CE218CE222893587F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaIMember" xlink:label="loc_nrg_AltaIMember_D189985903A047C9C758CE222893DF31" xlink:type="locator" />
    <definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AltaIMember_D189985903A047C9C758CE222893DF31" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaIIMember" xlink:label="loc_nrg_AltaIIMember_B907169B6489B2DEEBC2CE222893D5E8" xlink:type="locator" />
    <definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AltaIIMember_B907169B6489B2DEEBC2CE222893D5E8" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaIIIMember" xlink:label="loc_nrg_AltaIIIMember_B9224BE228D11CE6A600CE2228938CD3" xlink:type="locator" />
    <definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AltaIIIMember_B9224BE228D11CE6A600CE2228938CD3" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaIVMember" xlink:label="loc_nrg_AltaIVMember_C476976E173CB349B9CDCE222893961D" xlink:type="locator" />
    <definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AltaIVMember_C476976E173CB349B9CDCE222893961D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaVMember" xlink:label="loc_nrg_AltaVMember_AD2D29134313B0BF5F7ACE2228931966" xlink:type="locator" />
    <definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AltaVMember_AD2D29134313B0BF5F7ACE2228931966" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaXMember" xlink:label="loc_nrg_AltaXMember_8D0A5ABF4A2D46DDC776CE2228939E0B" xlink:type="locator" />
    <definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AltaXMember_8D0A5ABF4A2D46DDC776CE2228939E0B" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaXIMember" xlink:label="loc_nrg_AltaXIMember_4C61911601BE42AF991DCE2228938BE4" xlink:type="locator" />
    <definitionArc order="28" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_AltaXIMember_4C61911601BE42AF991DCE2228938BE4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SouthTrentHoldingLlcMember" xlink:label="loc_nrg_SouthTrentHoldingLlcMember_AE195D607E18B7F9E98BCE2228931FA4" xlink:type="locator" />
    <definitionArc order="29" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_SouthTrentHoldingLlcMember_AE195D607E18B7F9E98BCE2228931FA4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LaredoRidgeMember" xlink:label="loc_nrg_LaredoRidgeMember_52EBC111CEA6BDA5B9C9CE2228937B95" xlink:type="locator" />
    <definitionArc order="30" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_LaredoRidgeMember_52EBC111CEA6BDA5B9C9CE2228937B95" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TalogaMember" xlink:label="loc_nrg_TalogaMember_684CBCA1366883ECB3E3CE2228938C4E" xlink:type="locator" />
    <definitionArc order="31" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_TalogaMember_684CBCA1366883ECB3E3CE2228938C4E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PinnacleMember" xlink:label="loc_nrg_PinnacleMember_212D1454C8968300D2D7CE22289365AF" xlink:type="locator" />
    <definitionArc order="32" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_PinnacleMember_212D1454C8968300D2D7CE22289365AF" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BuffaloBearMember" xlink:label="loc_nrg_BuffaloBearMember_211700EBD3E65AFA6579CE222893750E" xlink:type="locator" />
    <definitionArc order="33" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_BuffaloBearMember_211700EBD3E65AFA6579CE222893750E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SpringCanyonIIMember" xlink:label="loc_nrg_SpringCanyonIIMember_A8AA0242AA9F20849600CE222893F19C" xlink:type="locator" />
    <definitionArc order="34" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_SpringCanyonIIMember_A8AA0242AA9F20849600CE222893F19C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SpringCanyonIIIMember" xlink:label="loc_nrg_SpringCanyonIIIMember_BDF246EE1FB3CE377B00CE222893BC32" xlink:type="locator" />
    <definitionArc order="35" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5603173C311884A1781CE2228934728" xlink:to="loc_nrg_SpringCanyonIIIMember_BDF246EE1FB3CE377B00CE222893BC32" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_D0B0250A80A6F7798379CE22289387FA" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:to="loc_us-gaap_CounterpartyNameAxis_D0B0250A80A6F7798379CE22289387FA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_255905AC639FD3F4CCE8CE2228930130_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CounterpartyNameAxis_D0B0250A80A6F7798379CE22289387FA" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_255905AC639FD3F4CCE8CE2228930130_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_255905AC639FD3F4CCE8CE2228930130" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CounterpartyNameAxis_D0B0250A80A6F7798379CE22289387FA" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_255905AC639FD3F4CCE8CE2228930130" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldMember" xlink:label="loc_nrg_NRGYieldMember_0815D96218F949EC3E1BCE921E0A5EDD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_255905AC639FD3F4CCE8CE2228930130" xlink:to="loc_nrg_NRGYieldMember_0815D96218F949EC3E1BCE921E0A5EDD" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgYieldIncMember" xlink:label="loc_nrg_NrgYieldIncMember_F486AB868C834DE61A6BCE222893DC15" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_255905AC639FD3F4CCE8CE2228930130" xlink:to="loc_nrg_NrgYieldIncMember_F486AB868C834DE61A6BCE222893DC15" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgMember" xlink:label="loc_nrg_NrgMember_F04F333C2AA1AE997BEBCE2228939E94" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_255905AC639FD3F4CCE8CE2228930130" xlink:to="loc_nrg_NrgMember_F04F333C2AA1AE997BEBCE2228939E94" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldLLCMember" xlink:label="loc_nrg_NRGYieldLLCMember_5A3D1A8C376E89C3F4CECE22289371CC" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_255905AC639FD3F4CCE8CE2228930130" xlink:to="loc_nrg_NRGYieldLLCMember_5A3D1A8C376E89C3F4CECE22289371CC" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesByTypeAxis" xlink:label="loc_nrg_PowerGenerationFacilitiesByTypeAxis_2BD4C19FAFA47E40928ECE2228930B4C" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_NatureOfBusinessTable_2A00E56464C9644FF46FCE222893EA7A" xlink:to="loc_nrg_PowerGenerationFacilitiesByTypeAxis_2BD4C19FAFA47E40928ECE2228930B4C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_2BD4C19FAFA47E40928ECE2228930B4C" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_2BD4C19FAFA47E40928ECE2228930B4C" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ConventionalGenerationMember" xlink:label="loc_nrg_ConventionalGenerationMember_E4FF1B9671322553ADD4CE222893D2C3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672" xlink:to="loc_nrg_ConventionalGenerationMember_E4FF1B9671322553ADD4CE222893D2C3" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_UtilityScaleSolarMember" xlink:label="loc_nrg_UtilityScaleSolarMember_08E3A3CF73FD165C83F1CE2228937290" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672" xlink:to="loc_nrg_UtilityScaleSolarMember_08E3A3CF73FD165C83F1CE2228937290" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DistributedSolarMember" xlink:label="loc_nrg_DistributedSolarMember_384F7EB397A8FD131251CE222893D91E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672" xlink:to="loc_nrg_DistributedSolarMember_384F7EB397A8FD131251CE222893D91E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WindFarmsMember" xlink:label="loc_nrg_WindFarmsMember_9738992296A4632CAE22CE222893A4DD" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672" xlink:to="loc_nrg_WindFarmsMember_9738992296A4632CAE22CE222893A4DD" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ThermalMember" xlink:label="loc_nrg_ThermalMember_6E79EBF638C8B4D9EF25CE22289302B4" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_2FE3D432574668852BF2CE2228931672" xlink:to="loc_nrg_ThermalMember_6E79EBF638C8B4D9EF25CE22289302B4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction" xlink:label="loc_us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction_9C6286FFCC8DFFB55761CE222893F90E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction_9C6286FFCC8DFFB55761CE222893F90E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_08EBEE81C7B02EEA26F1CE2228938498" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_08EBEE81C7B02EEA26F1CE2228938498" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_6181016BEC4BECFF1C69CE2228938AB4" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_6181016BEC4BECFF1C69CE2228938AB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PartnersCapitalAccountUnitsSaleOfUnits" xlink:label="loc_us-gaap_PartnersCapitalAccountUnitsSaleOfUnits_226B81BE5C370E788158CE222893F620" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_PartnersCapitalAccountUnitsSaleOfUnits_226B81BE5C370E788158CE222893F620" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersVotingInterest" xlink:label="loc_nrg_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersVotingInterest_2F08DBD022234C1743A9CE22289386EF" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_nrg_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersVotingInterest_2F08DBD022234C1743A9CE22289386EF" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MegawattsThermalEquivalentAvailableUnderrighttouseProvisions" xlink:label="loc_nrg_MegawattsThermalEquivalentAvailableUnderrighttouseProvisions_C462884891347C4EEBD3CE222893B1AF" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_nrg_MegawattsThermalEquivalentAvailableUnderrighttouseProvisions_C462884891347C4EEBD3CE222893B1AF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_38DD3275C413A7E9C21FCE222893556C" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_38DD3275C413A7E9C21FCE222893556C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_38686AF0220BC8F1937ACE222893159F" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_38686AF0220BC8F1937ACE222893159F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PercentageOfOwnership" xlink:label="loc_nrg_PercentageOfOwnership_CECB808ADECF7410FDF6CE22289368E6" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_nrg_PercentageOfOwnership_CECB808ADECF7410FDF6CE22289368E6" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_4BB0E0E1EF8E8BD4C292CE2228937F46" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_4BB0E0E1EF8E8BD4C292CE2228937F46" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SteamAndChilledWaterCapacityMegawattsThermalEquivalent" xlink:label="loc_nrg_SteamAndChilledWaterCapacityMegawattsThermalEquivalent_DAA85C8872F28CD912EACE2228932426" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_nrg_SteamAndChilledWaterCapacityMegawattsThermalEquivalent_DAA85C8872F28CD912EACE2228932426" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_69EF9252EE1315CDC575CE2228937E71" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_69EF9252EE1315CDC575CE2228937E71" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_5D280E2F26B8B55A1C74CE2228932D9D" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_5D280E2F26B8B55A1C74CE2228932D9D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_34DE10490E691E7C62B5CE222893E451" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_34DE10490E691E7C62B5CE222893E451" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital" xlink:label="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_C33811F4886D01B4740ACE2228936B4D" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_BasisofPresentationLineItems_F841A10224DBCCEDEE08CE22289370D1" xlink:to="loc_nrg_BusinessAcquisitionConsiderationTransferredWorkingCapital_C33811F4886D01B4740ACE2228936B4D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/NatureOfBusinessNatureOfBusinessTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/PropertyPlantAndEquipment" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/PropertyPlantAndEquipmentDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_87DF1472386521F238DD041585B9E3C9" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_3460C76C3D5C8AE8952F041585B9B5A7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_87DF1472386521F238DD041585B9E3C9" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_3460C76C3D5C8AE8952F041585B9B5A7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_890C0533688EAD3967DB041585B9C75D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_3460C76C3D5C8AE8952F041585B9B5A7" xlink:to="loc_us-gaap_RangeAxis_890C0533688EAD3967DB041585B9C75D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_9D8EA2DCDA097321DE66041585B959B0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_890C0533688EAD3967DB041585B9C75D" xlink:to="loc_us-gaap_RangeMember_9D8EA2DCDA097321DE66041585B959B0_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_9D8EA2DCDA097321DE66041585B959B0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_890C0533688EAD3967DB041585B9C75D" xlink:to="loc_us-gaap_RangeMember_9D8EA2DCDA097321DE66041585B959B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_B8F3F0D4E372E882C5D4041585B9F404" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_9D8EA2DCDA097321DE66041585B959B0" xlink:to="loc_us-gaap_MinimumMember_B8F3F0D4E372E882C5D4041585B9F404" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_BCF60ACFA0229A64AD5A041585B9C7DE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_9D8EA2DCDA097321DE66041585B959B0" xlink:to="loc_us-gaap_MaximumMember_BCF60ACFA0229A64AD5A041585B9C7DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B23EE16E91ED01E5B1C8041585B9B989" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_3460C76C3D5C8AE8952F041585B9B5A7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B23EE16E91ED01E5B1C8041585B9B989" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_963950A2FABD8814A1AB041585B993A1_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B23EE16E91ED01E5B1C8041585B9B989" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_963950A2FABD8814A1AB041585B993A1_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_963950A2FABD8814A1AB041585B993A1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_B23EE16E91ED01E5B1C8041585B9B989" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_963950A2FABD8814A1AB041585B993A1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SupportEquipmentAndFacilitiesMember" xlink:label="loc_us-gaap_SupportEquipmentAndFacilitiesMember_12365AF885FD7DC28818041585B90C58" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_963950A2FABD8814A1AB041585B993A1" xlink:to="loc_us-gaap_SupportEquipmentAndFacilitiesMember_12365AF885FD7DC28818041585B90C58" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LandAndLandImprovementsMember" xlink:label="loc_us-gaap_LandAndLandImprovementsMember_19164C7E49C649EC824A041585B93ED7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_963950A2FABD8814A1AB041585B993A1" xlink:to="loc_us-gaap_LandAndLandImprovementsMember_19164C7E49C649EC824A041585B93ED7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_56CCFCDFAFE9E8D962B0041585B9FB3D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_87DF1472386521F238DD041585B9E3C9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_56CCFCDFAFE9E8D962B0041585B9FB3D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_2BF8CB8B098ED16B03DB041585B9AEC7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_87DF1472386521F238DD041585B9E3C9" xlink:to="loc_us-gaap_ConstructionInProgressGross_2BF8CB8B098ED16B03DB041585B9AEC7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_99D121D89851F404A281041585B9970E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_87DF1472386521F238DD041585B9E3C9" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_99D121D89851F404A281041585B9970E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_56B429B34A4E77CBA1B8041585B9B210" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_87DF1472386521F238DD041585B9E3C9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_56B429B34A4E77CBA1B8041585B9B210" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_122E4FC4332E3CC809A5041585B954D6" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_87DF1472386521F238DD041585B9E3C9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_122E4FC4332E3CC809A5041585B954D6" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/PropertyPlantAndEquipmentTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/RelatedPartyTransactions" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_2D007431637A6F6B985BCA769091809B" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0641DF323990E31465E5CA76908F0862" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2D007431637A6F6B985BCA769091809B" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0641DF323990E31465E5CA76908F0862" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_0A94309DEA9C021535D0CA76908FAAC2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0641DF323990E31465E5CA76908F0862" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_0A94309DEA9C021535D0CA76908FAAC2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_407F2BFB3C1395447472CA76908FE810_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_0A94309DEA9C021535D0CA76908FAAC2" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_407F2BFB3C1395447472CA76908FE810_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_407F2BFB3C1395447472CA76908FE810" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_0A94309DEA9C021535D0CA76908FAAC2" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_407F2BFB3C1395447472CA76908FE810" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_56BEF0F54C08AE4EC05CCA7690901787" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_407F2BFB3C1395447472CA76908FE810" xlink:to="loc_us-gaap_SubsequentEventMember_56BEF0F54C08AE4EC05CCA7690901787" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_FAF29115615D129A73C9CA769090B667" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0641DF323990E31465E5CA76908F0862" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_FAF29115615D129A73C9CA769090B667" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_C8046D3DA5CCB29B73ABCA76909083A5_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_FAF29115615D129A73C9CA769090B667" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_C8046D3DA5CCB29B73ABCA76909083A5_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_C8046D3DA5CCB29B73ABCA76909083A5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_FAF29115615D129A73C9CA769090B667" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_C8046D3DA5CCB29B73ABCA76909083A5" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGElSegundoOperationsInc.Member" xlink:label="loc_nrg_NRGElSegundoOperationsInc.Member_FFEEA76C85809F012B1DCA7690901CB4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_C8046D3DA5CCB29B73ABCA76909083A5" xlink:to="loc_nrg_NRGElSegundoOperationsInc.Member_FFEEA76C85809F012B1DCA7690901CB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_F6344B64DECE41C8CD6FCA769090C28E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0641DF323990E31465E5CA76908F0862" xlink:to="loc_us-gaap_InvestmentTypeAxis_F6344B64DECE41C8CD6FCA769090C28E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_DC615E5501C675F1DEF8CA7690903A4B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_F6344B64DECE41C8CD6FCA769090C28E" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_DC615E5501C675F1DEF8CA7690903A4B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_DC615E5501C675F1DEF8CA7690903A4B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_F6344B64DECE41C8CD6FCA769090C28E" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_DC615E5501C675F1DEF8CA7690903A4B" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaxEquityFinancedPortfolioofLeasesMember" xlink:label="loc_nrg_TaxEquityFinancedPortfolioofLeasesMember_2F03C3644C24048B14D1CA769090DD96" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_DC615E5501C675F1DEF8CA7690903A4B" xlink:to="loc_nrg_TaxEquityFinancedPortfolioofLeasesMember_2F03C3644C24048B14D1CA769090DD96" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_C2080AEFE9E3511B41ADCA7690903913" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0641DF323990E31465E5CA76908F0862" xlink:to="loc_dei_LegalEntityAxis_C2080AEFE9E3511B41ADCA7690903913" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_C2080AEFE9E3511B41ADCA7690903913" xlink:to="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_C2080AEFE9E3511B41ADCA7690903913" xlink:to="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGYieldMember" xlink:label="loc_nrg_NRGYieldMember_B02EEE8A84A60C2E77A5CA769090A2AD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:to="loc_nrg_NRGYieldMember_B02EEE8A84A60C2E77A5CA769090A2AD" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgYieldIncMember" xlink:label="loc_nrg_NrgYieldIncMember_354C1EA374B023916245CA7690906898" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:to="loc_nrg_NrgYieldIncMember_354C1EA374B023916245CA7690906898" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ThermalMember" xlink:label="loc_nrg_ThermalMember_C2FFA006D06D20F7942CCA769090A7B7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:to="loc_nrg_ThermalMember_C2FFA006D06D20F7942CCA769090A7B7" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_MarshLandingMember" xlink:label="loc_nrg_MarshLandingMember_F3B575BE00893AEAB00FCA76909195C2" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:to="loc_nrg_MarshLandingMember_F3B575BE00893AEAB00FCA76909195C2" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ElSegundoMember" xlink:label="loc_nrg_ElSegundoMember_968C579F23A86EA99F92CA7690915AAE" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:to="loc_nrg_ElSegundoMember_968C579F23A86EA99F92CA7690915AAE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_GenConnEnergyLlcMember" xlink:label="loc_nrg_GenConnEnergyLlcMember_3099978D0FC8B4F1F522CA769091DB26" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:to="loc_nrg_GenConnEnergyLlcMember_3099978D0FC8B4F1F522CA769091DB26" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_CvsrMember" xlink:label="loc_nrg_CvsrMember_1F93763A512CE2429C3CCA769091F598" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_D5690C948BB2949DB9FDCA7690906674" xlink:to="loc_nrg_CvsrMember_1F93763A512CE2429C3CCA769091F598" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_55C46109F26FB1255BBECA7690915B54" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0641DF323990E31465E5CA76908F0862" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_55C46109F26FB1255BBECA7690915B54" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_8868C94DFBAAA6CC2F7BCA769091DABB_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_55C46109F26FB1255BBECA7690915B54" xlink:to="loc_us-gaap_RelatedPartyDomain_8868C94DFBAAA6CC2F7BCA769091DABB_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_8868C94DFBAAA6CC2F7BCA769091DABB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_55C46109F26FB1255BBECA7690915B54" xlink:to="loc_us-gaap_RelatedPartyDomain_8868C94DFBAAA6CC2F7BCA769091DABB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_GenOnEnergyServicesLLCMember" xlink:label="loc_nrg_GenOnEnergyServicesLLCMember_862E8A360BBB9FEA8FD9CA7690914523" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_8868C94DFBAAA6CC2F7BCA769091DABB" xlink:to="loc_nrg_GenOnEnergyServicesLLCMember_862E8A360BBB9FEA8FD9CA7690914523" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGElSegundoOperationsInc.Member" xlink:label="loc_nrg_NRGElSegundoOperationsInc.Member_4FC0B495FA2FD0B53419CA76909129DF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_8868C94DFBAAA6CC2F7BCA769091DABB" xlink:to="loc_nrg_NRGElSegundoOperationsInc.Member_4FC0B495FA2FD0B53419CA76909129DF" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NrgMember" xlink:label="loc_nrg_NrgMember_71F9EDCC9B8F202F4771CA7690918D16" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_8868C94DFBAAA6CC2F7BCA769091DABB" xlink:to="loc_nrg_NrgMember_71F9EDCC9B8F202F4771CA7690918D16" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGEnergyServicesLLCMember" xlink:label="loc_nrg_NRGEnergyServicesLLCMember_A5BDC8F262A9219C1821CA7690912433" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_8868C94DFBAAA6CC2F7BCA769091DABB" xlink:to="loc_nrg_NRGEnergyServicesLLCMember_A5BDC8F262A9219C1821CA7690912433" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_48C7922DFE184674F680CA769091705D" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0641DF323990E31465E5CA76908F0862" xlink:to="loc_us-gaap_StatementScenarioAxis_48C7922DFE184674F680CA769091705D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_80F62CEAA2E7774AEB38CA7690914961_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_48C7922DFE184674F680CA769091705D" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_80F62CEAA2E7774AEB38CA7690914961_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_80F62CEAA2E7774AEB38CA7690914961" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_48C7922DFE184674F680CA769091705D" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_80F62CEAA2E7774AEB38CA7690914961" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioPlanMember" xlink:label="loc_us-gaap_ScenarioPlanMember_08317207E7F98DF3BD32CA7690912FAB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_80F62CEAA2E7774AEB38CA7690914961" xlink:to="loc_us-gaap_ScenarioPlanMember_08317207E7F98DF3BD32CA7690912FAB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ServiceManagementCosts" xlink:label="loc_us-gaap_ServiceManagementCosts_7E71831111ABB058A121CA7690919A30" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2D007431637A6F6B985BCA769091809B" xlink:to="loc_us-gaap_ServiceManagementCosts_7E71831111ABB058A121CA7690919A30" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ServiceManagementCostsFeeIncrease" xlink:label="loc_nrg_ServiceManagementCostsFeeIncrease_35F7D138202E7006ECA0CA769092C628" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2D007431637A6F6B985BCA769091809B" xlink:to="loc_nrg_ServiceManagementCostsFeeIncrease_35F7D138202E7006ECA0CA769092C628" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_BFD74858885ECA8720CECA769092CFD6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2D007431637A6F6B985BCA769091809B" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_BFD74858885ECA8720CECA769092CFD6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty" xlink:label="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_CA02C98F223F001A398BCA7690923689" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2D007431637A6F6B985BCA769091809B" xlink:to="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_CA02C98F223F001A398BCA7690923689" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DueToAffiliateCurrentAndNoncurrent" xlink:label="loc_us-gaap_DueToAffiliateCurrentAndNoncurrent_BC67D29829BB6B191E0CCA769092AD1C" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2D007431637A6F6B985BCA769091809B" xlink:to="loc_us-gaap_DueToAffiliateCurrentAndNoncurrent_BC67D29829BB6B191E0CCA769092AD1C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfRelatedPartyDebt" xlink:label="loc_us-gaap_RepaymentsOfRelatedPartyDebt_F7B37C7122876875DB19CA7690922BCC" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2D007431637A6F6B985BCA769091809B" xlink:to="loc_us-gaap_RepaymentsOfRelatedPartyDebt_F7B37C7122876875DB19CA7690922BCC" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/SegmentReporting" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/SegmentReportingDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_9794F3677E84C8A61A1ED2D45DF46BE3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_9794F3677E84C8A61A1ED2D45DF46BE3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_DE73F7BA9485AE20F436D2D45DF4DEB8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_9794F3677E84C8A61A1ED2D45DF46BE3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_DE73F7BA9485AE20F436D2D45DF4DEB8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_8B7A9D61CB03A79ABD13D2D45DF45C46_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_DE73F7BA9485AE20F436D2D45DF4DEB8" xlink:to="loc_us-gaap_SegmentDomain_8B7A9D61CB03A79ABD13D2D45DF45C46_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_8B7A9D61CB03A79ABD13D2D45DF45C46" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_DE73F7BA9485AE20F436D2D45DF4DEB8" xlink:to="loc_us-gaap_SegmentDomain_8B7A9D61CB03A79ABD13D2D45DF45C46" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ConventionalGenerationMember" xlink:label="loc_nrg_ConventionalGenerationMember_7E233A4093516629634DD2D45DF55ADF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8B7A9D61CB03A79ABD13D2D45DF45C46" xlink:to="loc_nrg_ConventionalGenerationMember_7E233A4093516629634DD2D45DF55ADF" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_RenewablesMember" xlink:label="loc_nrg_RenewablesMember_67E7120AE295808AAAD3D2D45DF5FEF8" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8B7A9D61CB03A79ABD13D2D45DF45C46" xlink:to="loc_nrg_RenewablesMember_67E7120AE295808AAAD3D2D45DF5FEF8" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ThermalMember" xlink:label="loc_nrg_ThermalMember_43EAF276D3300EE50931D2D45DF5C77D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8B7A9D61CB03A79ABD13D2D45DF45C46" xlink:to="loc_nrg_ThermalMember_43EAF276D3300EE50931D2D45DF5C77D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateMember" xlink:label="loc_us-gaap_CorporateMember_62BDDACD1225C658F7B0D2D45DF5285C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8B7A9D61CB03A79ABD13D2D45DF45C46" xlink:to="loc_us-gaap_CorporateMember_62BDDACD1225C658F7B0D2D45DF5285C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_3DC471727072EE4DBF44D2D45DF5D48F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_Revenues_3DC471727072EE4DBF44D2D45DF5D48F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_40B91AC48396F1A475CBD2D45DF5ABE5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_OperatingExpenses_40B91AC48396F1A475CBD2D45DF5ABE5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_828E161FE027FCBAB05AD2D45DF514A8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_828E161FE027FCBAB05AD2D45DF514A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_3BC3FC83739C5B04EBF8D2D45DF5D165" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_3BC3FC83739C5B04EBF8D2D45DF5D165" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_68713C7D4A2134A47A37D2D45DF5C9FB" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_68713C7D4A2134A47A37D2D45DF5C9FB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_274EAF6D5164FE3AC35AD2D45DF5078E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_OperatingIncomeLoss_274EAF6D5164FE3AC35AD2D45DF5078E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_1BF0415C5391DA5486F7D2D45DF53D11" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_1BF0415C5391DA5486F7D2D45DF53D11" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_CE119245FCCC40B1BBB9D2D45DF52FF5" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_CE119245FCCC40B1BBB9D2D45DF52FF5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_C948A65D0DCC0120352DD2D45DF6D6F4" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_C948A65D0DCC0120352DD2D45DF6D6F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_025369BB2F9DC365509DD2D45DF65DE0" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_InterestExpense_025369BB2F9DC365509DD2D45DF65DE0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8C36AA0C8B5818B9E1A4D2D45DF6257C" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8C36AA0C8B5818B9E1A4D2D45DF6257C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_0794F7738ED38EB1A1EAD2D45DF699D3" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_0794F7738ED38EB1A1EAD2D45DF699D3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_EDE0470A23B6F9841343D2D45DF6347F" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_ProfitLoss_EDE0470A23B6F9841343D2D45DF6347F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_E64211F0AB7F47C8CA55D2D45DF6A044" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_184D91E3BF168020BBFAD2D45DF52773" xlink:to="loc_us-gaap_Assets_E64211F0AB7F47C8CA55D2D45DF6A044" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/SegmentReportingSegmentReportingPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/SegmentReportingTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:type="extended">
    <loc xlink:href="nrg-20150930.xsd#nrg_SummaryOfSignificantAccountingPoliciesLineItems" xlink:label="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:type="locator" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SummaryofSignificantAccountingPoliciesTable" xlink:label="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_3D017D0F90E0A633E5F79CC672DCDFE1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:to="loc_us-gaap_StatementClassOfStockAxis_3D017D0F90E0A633E5F79CC672DCDFE1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_AEAF5C466B49913E1CF39CC6745F7A0A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3D017D0F90E0A633E5F79CC672DCDFE1" xlink:to="loc_us-gaap_ClassOfStockDomain_AEAF5C466B49913E1CF39CC6745F7A0A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_AEAF5C466B49913E1CF39CC6745F7A0A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3D017D0F90E0A633E5F79CC672DCDFE1" xlink:to="loc_us-gaap_ClassOfStockDomain_AEAF5C466B49913E1CF39CC6745F7A0A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaap_CommonClassAMember_8496A843583D6BF444ED9CC673E5916A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_AEAF5C466B49913E1CF39CC6745F7A0A" xlink:to="loc_us-gaap_CommonClassAMember_8496A843583D6BF444ED9CC673E5916A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesByTypeAxis" xlink:label="loc_nrg_PowerGenerationFacilitiesByTypeAxis_1D5CE3D222FC2B57AADF9CC65B435A2D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:to="loc_nrg_PowerGenerationFacilitiesByTypeAxis_1D5CE3D222FC2B57AADF9CC65B435A2D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_019888FEDEED8070C3EA9CC65B43BD40_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_1D5CE3D222FC2B57AADF9CC65B435A2D" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_019888FEDEED8070C3EA9CC65B43BD40_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_019888FEDEED8070C3EA9CC65B43BD40" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_1D5CE3D222FC2B57AADF9CC65B435A2D" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_019888FEDEED8070C3EA9CC65B43BD40" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WindFarmsMember" xlink:label="loc_nrg_WindFarmsMember_FF08C3C5C4BA847B6FB59CC65B43AD96" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_019888FEDEED8070C3EA9CC65B43BD40" xlink:to="loc_nrg_WindFarmsMember_FF08C3C5C4BA847B6FB59CC65B43AD96" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_53CCE02F5F7FD07C4B3A9CC65B438A52" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:to="loc_dei_LegalEntityAxis_53CCE02F5F7FD07C4B3A9CC65B438A52" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_552A31D97DE30F3A8AC19CC65B4384FD_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_53CCE02F5F7FD07C4B3A9CC65B438A52" xlink:to="loc_dei_EntityDomain_552A31D97DE30F3A8AC19CC65B4384FD_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_552A31D97DE30F3A8AC19CC65B4384FD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_53CCE02F5F7FD07C4B3A9CC65B438A52" xlink:to="loc_dei_EntityDomain_552A31D97DE30F3A8AC19CC65B4384FD" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaXandXITEHoldcoMember" xlink:label="loc_nrg_AltaXandXITEHoldcoMember_4AEC1E8046BD4A9ED67B9CC65B43C3CE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_552A31D97DE30F3A8AC19CC65B4384FD" xlink:to="loc_nrg_AltaXandXITEHoldcoMember_4AEC1E8046BD4A9ED67B9CC65B43C3CE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SpringCanyonMember" xlink:label="loc_nrg_SpringCanyonMember_574619501ACE7C26C67E9CC65B437838" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_552A31D97DE30F3A8AC19CC65B4384FD" xlink:to="loc_nrg_SpringCanyonMember_574619501ACE7C26C67E9CC65B437838" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsByNameAxis" xlink:label="loc_us-gaap_OtherOwnershipInterestsByNameAxis_CBC5CD26481034DA375D9CC65B4348F7" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:to="loc_us-gaap_OtherOwnershipInterestsByNameAxis_CBC5CD26481034DA375D9CC65B4348F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsNameDomain" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_243E0BA0F477FE9288FA9CC65B436DAE_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_CBC5CD26481034DA375D9CC65B4348F7" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_243E0BA0F477FE9288FA9CC65B436DAE_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsNameDomain" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_243E0BA0F477FE9288FA9CC65B436DAE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_CBC5CD26481034DA375D9CC65B4348F7" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_243E0BA0F477FE9288FA9CC65B436DAE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_FinancialInstitutionsMember" xlink:label="loc_nrg_FinancialInstitutionsMember_4507B73F407E2C317D5D9CC65B534F76" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherOwnershipInterestsNameDomain_243E0BA0F477FE9288FA9CC65B436DAE" xlink:to="loc_nrg_FinancialInstitutionsMember_4507B73F407E2C317D5D9CC65B534F76" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_718695C66A68A5ACBB509CC65B53A294" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_718695C66A68A5ACBB509CC65B53A294" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_C807BF783956BEE0E2739CC65B53F4A4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_718695C66A68A5ACBB509CC65B53A294" xlink:to="loc_us-gaap_EquityComponentDomain_C807BF783956BEE0E2739CC65B53F4A4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_C807BF783956BEE0E2739CC65B53F4A4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_718695C66A68A5ACBB509CC65B53A294" xlink:to="loc_us-gaap_EquityComponentDomain_C807BF783956BEE0E2739CC65B53F4A4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_FE0110812B45665056879CC65B53027D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C807BF783956BEE0E2739CC65B53F4A4" xlink:to="loc_us-gaap_NoncontrollingInterestMember_FE0110812B45665056879CC65B53027D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_37ADB7F1F793949A506B9CC65B535715" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:to="loc_us-gaap_StatementScenarioAxis_37ADB7F1F793949A506B9CC65B535715" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_AD69DC56AEB80ADA66459CC65B53ECFA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_37ADB7F1F793949A506B9CC65B535715" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_AD69DC56AEB80ADA66459CC65B53ECFA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_AD69DC56AEB80ADA66459CC65B53ECFA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_37ADB7F1F793949A506B9CC65B535715" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_AD69DC56AEB80ADA66459CC65B53ECFA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioPreviouslyReportedMember" xlink:label="loc_us-gaap_ScenarioPreviouslyReportedMember_ECC86A5BD22896DDA98C9CC65B53DB28" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_AD69DC56AEB80ADA66459CC65B53ECFA" xlink:to="loc_us-gaap_ScenarioPreviouslyReportedMember_ECC86A5BD22896DDA98C9CC65B53DB28" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScenarioPlanMember" xlink:label="loc_us-gaap_ScenarioPlanMember_E829DF9FA3FC6FAC99B69CC65B5303F9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_AD69DC56AEB80ADA66459CC65B53ECFA" xlink:to="loc_us-gaap_ScenarioPlanMember_E829DF9FA3FC6FAC99B69CC65B5303F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9E1B3C647743AF74B92F9CC65B53ABAE" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nrg_SummaryofSignificantAccountingPoliciesTable_147838BDDBEAB583F0989CC65B43E433" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9E1B3C647743AF74B92F9CC65B53ABAE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FF4F37959F1B96C8A20D9CC65B53ECF6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9E1B3C647743AF74B92F9CC65B53ABAE" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FF4F37959F1B96C8A20D9CC65B53ECF6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FF4F37959F1B96C8A20D9CC65B53ECF6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9E1B3C647743AF74B92F9CC65B53ABAE" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FF4F37959F1B96C8A20D9CC65B53ECF6" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SpringCanyonMember" xlink:label="loc_nrg_SpringCanyonMember_B4FAC8C4336A42831E699CC65B53D516" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FF4F37959F1B96C8A20D9CC65B53ECF6" xlink:to="loc_nrg_SpringCanyonMember_B4FAC8C4336A42831E699CC65B53D516" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_January2015DropDownAssetsMember" xlink:label="loc_nrg_January2015DropDownAssetsMember_E6AC2AB08F3F037D0AA29CC65B53E77B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FF4F37959F1B96C8A20D9CC65B53ECF6" xlink:to="loc_nrg_January2015DropDownAssetsMember_E6AC2AB08F3F037D0AA29CC65B53E77B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_AC2A0F0A2472F8B665509CC65B535F80" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_MinorityInterest_AC2A0F0A2472F8B665509CC65B535F80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_1C4E39FE81E3B845F1919CC65B53D928" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_1C4E39FE81E3B845F1919CC65B53D928" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromMinorityShareholders" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_55454A09122B87CDF6939CC65B632531" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_55454A09122B87CDF6939CC65B632531" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_46BAC42B39E8CE979C109CC65B633892" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_46BAC42B39E8CE979C109CC65B633892" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_F1CDDA6ACBC75FEB98ED9CC65B633936" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_F1CDDA6ACBC75FEB98ED9CC65B633936" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_Noncashadjustmenttononcontrollinginterest" xlink:label="loc_nrg_Noncashadjustmenttononcontrollinginterest_8E1EAACE323C6CF395949CC65B636BFD" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_nrg_Noncashadjustmenttononcontrollinginterest_8E1EAACE323C6CF395949CC65B636BFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_5FE60926B28E1ACEEC019CC65B632135" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_5FE60926B28E1ACEEC019CC65B632135" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PercentageOfOwnership" xlink:label="loc_nrg_PercentageOfOwnership_D253EFCFFBDA2D530A4A9CC65B63CB46" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_nrg_PercentageOfOwnership_D253EFCFFBDA2D530A4A9CC65B63CB46" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_03466931140A9A0744DC9CC65B63F65B" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_03466931140A9A0744DC9CC65B63F65B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses_6F36C24D92EE099E97C29CC65B63D1D8" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses_6F36C24D92EE099E97C29CC65B63D1D8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1_4524F38054425CAA738D9CC65B63B434" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1_4524F38054425CAA738D9CC65B63B434" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPayableDateDeclaredDayMonthAndYear" xlink:label="loc_us-gaap_DividendsPayableDateDeclaredDayMonthAndYear_183F9A5FD0F7CD051A139CC65B63AEE5" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_DividendsPayableDateDeclaredDayMonthAndYear_183F9A5FD0F7CD051A139CC65B63AEE5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_3A6706D57405B5EE6FFE9CC65B63E6CF" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_3A6706D57405B5EE6FFE9CC65B63E6CF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendPayableDateToBePaidDayMonthAndYear" xlink:label="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_71A509319716C3B78A339CC65B635873" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_71A509319716C3B78A339CC65B635873" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DividendsPayableDateOfRecordDayMonthAndYear" xlink:label="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_97AC420E338DE3061A5C9CC65B638B6A" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_97AC420E338DE3061A5C9CC65B638B6A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_D70120A5E08DCF1BE4C99CC65B63958F" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_D70120A5E08DCF1BE4C99CC65B63958F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_8275DC20CABEBD083DF39CC65B638999" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_8275DC20CABEBD083DF39CC65B638999" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D890855E9665070577E79CC65B631341" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_SummaryOfSignificantAccountingPoliciesLineItems_18496F7199E501AC36F99CC65B530B15" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D890855E9665070577E79CC65B631341" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntities" xlink:type="extended" />
  <definitionLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4F76B4DB22F5262B548ACEBC27CA18E3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_2BC2A36317523A7ABC72CEBC27C45F04" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4F76B4DB22F5262B548ACEBC27CA18E3" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_2BC2A36317523A7ABC72CEBC27C45F04" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_FE2BD15D34E7244343D0CEBC27C4598F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_2BC2A36317523A7ABC72CEBC27C45F04" xlink:to="loc_dei_LegalEntityAxis_FE2BD15D34E7244343D0CEBC27C4598F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_1929CF84CB6E4F31C6A2CEBC27C94225_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_FE2BD15D34E7244343D0CEBC27C4598F" xlink:to="loc_dei_EntityDomain_1929CF84CB6E4F31C6A2CEBC27C94225_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_1929CF84CB6E4F31C6A2CEBC27C94225" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_FE2BD15D34E7244343D0CEBC27C4598F" xlink:to="loc_dei_EntityDomain_1929CF84CB6E4F31C6A2CEBC27C94225" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaXandXITEHoldcoMember" xlink:label="loc_nrg_AltaXandXITEHoldcoMember_F87DC2F13DB8FBAF34D2CEBC27C9951A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_1929CF84CB6E4F31C6A2CEBC27C94225" xlink:to="loc_nrg_AltaXandXITEHoldcoMember_F87DC2F13DB8FBAF34D2CEBC27C9951A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2CD3E314D177AA9FCA3FCEBC27CAF89E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_2BC2A36317523A7ABC72CEBC27C45F04" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2CD3E314D177AA9FCA3FCEBC27CAF89E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_8C3941C4F70F410C4B44CEBC27CAFD98_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2CD3E314D177AA9FCA3FCEBC27CAF89E" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_8C3941C4F70F410C4B44CEBC27CAFD98_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_8C3941C4F70F410C4B44CEBC27CAFD98" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2CD3E314D177AA9FCA3FCEBC27CAF89E" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_8C3941C4F70F410C4B44CEBC27CAFD98" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGDGPVHoldcoMember" xlink:label="loc_nrg_NRGDGPVHoldcoMember_6B6EE9E66276B5409C20CEBC27CA0C8D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_8C3941C4F70F410C4B44CEBC27CAFD98" xlink:to="loc_nrg_NRGDGPVHoldcoMember_6B6EE9E66276B5409C20CEBC27CA0C8D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGRPVHoldcoMember" xlink:label="loc_nrg_NRGRPVHoldcoMember_DD0B3A3C628508ADBE0ECEBC27CADB58" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_8C3941C4F70F410C4B44CEBC27CAFD98" xlink:to="loc_nrg_NRGRPVHoldcoMember_DD0B3A3C628508ADBE0ECEBC27CADB58" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_GceHoldingLlcMember" xlink:label="loc_nrg_GceHoldingLlcMember_E29BE3174ACAF6FBEA73CEBC27CA5FDA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_8C3941C4F70F410C4B44CEBC27CAFD98" xlink:to="loc_nrg_GceHoldingLlcMember_E29BE3174ACAF6FBEA73CEBC27CA5FDA" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DesertSunlightMember" xlink:label="loc_nrg_DesertSunlightMember_9297D8E42CEADC022CB9CEBC27CACBEE" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_8C3941C4F70F410C4B44CEBC27CAFD98" xlink:to="loc_nrg_DesertSunlightMember_9297D8E42CEADC022CB9CEBC27CACBEE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTextBlock" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock_CB2CF6B9007AAD843C14CEBC27CAA632" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4F76B4DB22F5262B548ACEBC27CA18E3" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTextBlock_CB2CF6B9007AAD843C14CEBC27CAA632" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentsTextBlock" xlink:label="loc_us-gaap_EquityMethodInvestmentsTextBlock_59DAAF8E43B488D66944CEBC27CAE1CC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4F76B4DB22F5262B548ACEBC27CA18E3" xlink:to="loc_us-gaap_EquityMethodInvestmentsTextBlock_59DAAF8E43B488D66944CEBC27CAE1CC" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesAltaTeHoldcoDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3A9E467A795CE6E09E85CEBC285ECE09" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3A9E467A795CE6E09E85CEBC285ECE09" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PeriodAxis" xlink:label="loc_nrg_PeriodAxis_5DC920874046D5853CA6CEBC285E247F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3A9E467A795CE6E09E85CEBC285ECE09" xlink:to="loc_nrg_PeriodAxis_5DC920874046D5853CA6CEBC285E247F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PeriodDomain" xlink:label="loc_nrg_PeriodDomain_DF1B9620B53AF38D996ECEBC285E5230_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PeriodAxis_5DC920874046D5853CA6CEBC285E247F" xlink:to="loc_nrg_PeriodDomain_DF1B9620B53AF38D996ECEBC285E5230_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PeriodDomain" xlink:label="loc_nrg_PeriodDomain_DF1B9620B53AF38D996ECEBC285E5230" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PeriodAxis_5DC920874046D5853CA6CEBC285E247F" xlink:to="loc_nrg_PeriodDomain_DF1B9620B53AF38D996ECEBC285E5230" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_FirstYearMember" xlink:label="loc_nrg_FirstYearMember_2FBF7EF938E68849FCACCEBC285E393A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PeriodDomain_DF1B9620B53AF38D996ECEBC285E5230" xlink:to="loc_nrg_FirstYearMember_2FBF7EF938E68849FCACCEBC285E393A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SecondYearthroughFlipPointMember" xlink:label="loc_nrg_SecondYearthroughFlipPointMember_213EB5B8EE32B77C3349CEBC285E5C3E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PeriodDomain_DF1B9620B53AF38D996ECEBC285E5230" xlink:to="loc_nrg_SecondYearthroughFlipPointMember_213EB5B8EE32B77C3349CEBC285E5C3E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PostFlipPointMember" xlink:label="loc_nrg_PostFlipPointMember_450167E9AD665C8E2C84CEBC285EE0C1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PeriodDomain_DF1B9620B53AF38D996ECEBC285E5230" xlink:to="loc_nrg_PostFlipPointMember_450167E9AD665C8E2C84CEBC285EE0C1" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PredeterminedDateThroughFlipPointIfFlipHasNotOccuredMember" xlink:label="loc_nrg_PredeterminedDateThroughFlipPointIfFlipHasNotOccuredMember_B06C428FC49F045E16B4CEBC285ED42A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PeriodDomain_DF1B9620B53AF38D996ECEBC285E5230" xlink:to="loc_nrg_PredeterminedDateThroughFlipPointIfFlipHasNotOccuredMember_B06C428FC49F045E16B4CEBC285ED42A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_BC7DC142D40BCA2D3147CEBC285EEBB4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3A9E467A795CE6E09E85CEBC285ECE09" xlink:to="loc_dei_LegalEntityAxis_BC7DC142D40BCA2D3147CEBC285EEBB4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2669635D9D3AF81F0178CEBC285E6D07_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_BC7DC142D40BCA2D3147CEBC285EEBB4" xlink:to="loc_dei_EntityDomain_2669635D9D3AF81F0178CEBC285E6D07_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_2669635D9D3AF81F0178CEBC285E6D07" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_BC7DC142D40BCA2D3147CEBC285EEBB4" xlink:to="loc_dei_EntityDomain_2669635D9D3AF81F0178CEBC285E6D07" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_AltaXandXITEHoldcoMember" xlink:label="loc_nrg_AltaXandXITEHoldcoMember_EBDDE6F3150F801A3ED0CEBC285ED89A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2669635D9D3AF81F0178CEBC285E6D07" xlink:to="loc_nrg_AltaXandXITEHoldcoMember_EBDDE6F3150F801A3ED0CEBC285ED89A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsByNameAxis" xlink:label="loc_us-gaap_OtherOwnershipInterestsByNameAxis_CF32F3F3BC1668E626CECEBC285E1CCA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3A9E467A795CE6E09E85CEBC285ECE09" xlink:to="loc_us-gaap_OtherOwnershipInterestsByNameAxis_CF32F3F3BC1668E626CECEBC285E1CCA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsNameDomain" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_5501ADDF547446C75809CEBC285EE70D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_CF32F3F3BC1668E626CECEBC285E1CCA" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_5501ADDF547446C75809CEBC285EE70D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherOwnershipInterestsNameDomain" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_5501ADDF547446C75809CEBC285EE70D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_CF32F3F3BC1668E626CECEBC285E1CCA" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_5501ADDF547446C75809CEBC285EE70D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_FinancialInstitutionsMember" xlink:label="loc_nrg_FinancialInstitutionsMember_3167A0A77FF3F3ED22A7CEBC285EFA1B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherOwnershipInterestsNameDomain_5501ADDF547446C75809CEBC285EE70D" xlink:to="loc_nrg_FinancialInstitutionsMember_3167A0A77FF3F3ED22A7CEBC285EFA1B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_FF61AD7EAF97D952124FCEBC285EC1A1" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3A9E467A795CE6E09E85CEBC285ECE09" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_FF61AD7EAF97D952124FCEBC285EC1A1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_A2DF080FF52D797CD76BCEBC285E674B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_FF61AD7EAF97D952124FCEBC285EC1A1" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_A2DF080FF52D797CD76BCEBC285E674B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_A2DF080FF52D797CD76BCEBC285E674B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_FF61AD7EAF97D952124FCEBC285EC1A1" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_A2DF080FF52D797CD76BCEBC285E674B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_8F6093D09CB7550A6966CEBC285E7670" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3A9E467A795CE6E09E85CEBC285ECE09" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_8F6093D09CB7550A6966CEBC285E7670" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_60F5438B17BFFF3297E8CEBC285E6C99_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_8F6093D09CB7550A6966CEBC285E7670" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_60F5438B17BFFF3297E8CEBC285E6C99_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_60F5438B17BFFF3297E8CEBC285E6C99" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_8F6093D09CB7550A6966CEBC285E7670" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_60F5438B17BFFF3297E8CEBC285E6C99" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssets" xlink:label="loc_us-gaap_OtherAssets_0B1350A0DCF48AB5C57FCEBC285E9CF0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_OtherAssets_0B1350A0DCF48AB5C57FCEBC285E9CF0" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaxableIncomeAllocationPreFlip" xlink:label="loc_nrg_TaxableIncomeAllocationPreFlip_8FC8B04BA3E9101E3D57CEBC285E7789" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_nrg_TaxableIncomeAllocationPreFlip_8FC8B04BA3E9101E3D57CEBC285E7789" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaxableIncomeAllocationPostFlip" xlink:label="loc_nrg_TaxableIncomeAllocationPostFlip_07194990F82CBB4BCC64CEBC285E9D60" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_nrg_TaxableIncomeAllocationPostFlip_07194990F82CBB4BCC64CEBC285E9D60" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PercentageofCashAvailableforDistributions" xlink:label="loc_nrg_PercentageofCashAvailableforDistributions_B58335DB188336A5597DCEBC285E107A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_nrg_PercentageofCashAvailableforDistributions_B58335DB188336A5597DCEBC285E107A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromMinorityShareholders" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_37C0A800266B6AF46AF0CEBC285ECE64" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_37C0A800266B6AF46AF0CEBC285ECE64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_DB3D902970EB07DCBA96CEBC285EDF59" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_DB3D902970EB07DCBA96CEBC285EDF59" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1BE537AF55C568AF3B31CEBC285EF6EE" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1BE537AF55C568AF3B31CEBC285EF6EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_3CC23A10F90DEC175C67CEBC285EA766" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_Assets_3CC23A10F90DEC175C67CEBC285EA766" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_3FF8F5AA3E2B5993125ACEBC285E9155" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_Liabilities_3FF8F5AA3E2B5993125ACEBC285E9155" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NoncontrollingInterestInVariableInterestEntity" xlink:label="loc_us-gaap_NoncontrollingInterestInVariableInterestEntity_7B65759754AC93DE19BDCEBC285EA698" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_NoncontrollingInterestInVariableInterestEntity_7B65759754AC93DE19BDCEBC285EA698" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsNet" xlink:label="loc_us-gaap_AssetsNet_319057589EF4C2B2899CCEBC285E3893" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_41D66DB71072B17F1511CEBC285EF84E" xlink:to="loc_us-gaap_AssetsNet_319057589EF4C2B2899CCEBC285E3893" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesDesertSunlightDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5C49D2BE3236ADFA7521CEBC2AA6022E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5C49D2BE3236ADFA7521CEBC2AA6022E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_289801642108619510CFCEBC2AA6A44C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5C49D2BE3236ADFA7521CEBC2AA6022E" xlink:to="loc_us-gaap_CounterpartyNameAxis_289801642108619510CFCEBC2AA6A44C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_0DDE221D72F3C9B5A837CEBC2AA6F98A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CounterpartyNameAxis_289801642108619510CFCEBC2AA6A44C" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_0DDE221D72F3C9B5A837CEBC2AA6F98A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_0DDE221D72F3C9B5A837CEBC2AA6F98A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CounterpartyNameAxis_289801642108619510CFCEBC2AA6A44C" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_0DDE221D72F3C9B5A837CEBC2AA6F98A" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PacificGasandElectricMember" xlink:label="loc_nrg_PacificGasandElectricMember_D5C519357AD6CE90A51DCEBC2AA67504" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_0DDE221D72F3C9B5A837CEBC2AA6F98A" xlink:to="loc_nrg_PacificGasandElectricMember_D5C519357AD6CE90A51DCEBC2AA67504" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_SouthernCaliforniaEdisonMember" xlink:label="loc_nrg_SouthernCaliforniaEdisonMember_9FA7DB20EC79B1CACA20CEBC2AA6242B" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_0DDE221D72F3C9B5A837CEBC2AA6F98A" xlink:to="loc_nrg_SouthernCaliforniaEdisonMember_9FA7DB20EC79B1CACA20CEBC2AA6242B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D487C412126927B4B62ECEBC2AA6E34A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5C49D2BE3236ADFA7521CEBC2AA6022E" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D487C412126927B4B62ECEBC2AA6E34A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_49C3E1018AE67AF22B10CEBC2AA6140B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D487C412126927B4B62ECEBC2AA6E34A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_49C3E1018AE67AF22B10CEBC2AA6140B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_49C3E1018AE67AF22B10CEBC2AA6140B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D487C412126927B4B62ECEBC2AA6E34A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_49C3E1018AE67AF22B10CEBC2AA6140B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SupplyCommitmentArrangementMember" xlink:label="loc_us-gaap_SupplyCommitmentArrangementMember_75E7736C7CFDBBA33A90CEBC2AA60AC5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_49C3E1018AE67AF22B10CEBC2AA6140B" xlink:to="loc_us-gaap_SupplyCommitmentArrangementMember_75E7736C7CFDBBA33A90CEBC2AA60AC5" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesByTypeAxis" xlink:label="loc_nrg_PowerGenerationFacilitiesByTypeAxis_4BEE8EFD07EB6A757A8FCEBC2AA6EB9F" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5C49D2BE3236ADFA7521CEBC2AA6022E" xlink:to="loc_nrg_PowerGenerationFacilitiesByTypeAxis_4BEE8EFD07EB6A757A8FCEBC2AA6EB9F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_36A3E89DEED5EB762680CEBC2AA66D04_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_4BEE8EFD07EB6A757A8FCEBC2AA6EB9F" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_36A3E89DEED5EB762680CEBC2AA66D04_default" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationFacilitiesTypeDomain" xlink:label="loc_nrg_PowerGenerationFacilitiesTypeDomain_36A3E89DEED5EB762680CEBC2AA66D04" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_nrg_PowerGenerationFacilitiesByTypeAxis_4BEE8EFD07EB6A757A8FCEBC2AA6EB9F" xlink:to="loc_nrg_PowerGenerationFacilitiesTypeDomain_36A3E89DEED5EB762680CEBC2AA66D04" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_UtilityScaleSolarMember" xlink:label="loc_nrg_UtilityScaleSolarMember_659F328CB2E6A3AAE3A2CEBC2AA63A80" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nrg_PowerGenerationFacilitiesTypeDomain_36A3E89DEED5EB762680CEBC2AA66D04" xlink:to="loc_nrg_UtilityScaleSolarMember_659F328CB2E6A3AAE3A2CEBC2AA63A80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2CD1BFF11EAB60860EE2CEBC2AA61D78" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5C49D2BE3236ADFA7521CEBC2AA6022E" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2CD1BFF11EAB60860EE2CEBC2AA61D78" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_FF7752F4146CC5DED7BCCEBC2AA6C7F1_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2CD1BFF11EAB60860EE2CEBC2AA61D78" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_FF7752F4146CC5DED7BCCEBC2AA6C7F1_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_FF7752F4146CC5DED7BCCEBC2AA6C7F1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2CD1BFF11EAB60860EE2CEBC2AA61D78" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_FF7752F4146CC5DED7BCCEBC2AA6C7F1" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_DesertSunlightMember" xlink:label="loc_nrg_DesertSunlightMember_D33F9E09A281C363DF6DCEBC2AA6A5FC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_FF7752F4146CC5DED7BCCEBC2AA6C7F1" xlink:to="loc_nrg_DesertSunlightMember_D33F9E09A281C363DF6DCEBC2AA6A5FC" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PercentageOfOwnership" xlink:label="loc_nrg_PercentageOfOwnership_FE38F962DA79B6FCA508CEBC2AA6B8A4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_nrg_PercentageOfOwnership_FE38F962DA79B6FCA508CEBC2AA6B8A4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_85E952E3171694BB4D97CEBC2AA63F62" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_AssetsCurrent_85E952E3171694BB4D97CEBC2AA63F62" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_FB766E28BC5FA1519B72CEBC2AA6A681" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_Revenues_FB766E28BC5FA1519B72CEBC2AA6A681" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_0BE188B0775BA8044721CEBC2AA6C01B" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_OperatingIncomeLoss_0BE188B0775BA8044721CEBC2AA6C01B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_35B0440DF59C02AE1863CEBC2AA654AA" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_ProfitLoss_35B0440DF59C02AE1863CEBC2AA654AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaap_AssetsNoncurrent_7DF0FBC35B712D81476BCEBC2AA68C70" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_AssetsNoncurrent_7DF0FBC35B712D81476BCEBC2AA68C70" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_56CD550F403469EB2D62CEBC2AA63A31" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_LiabilitiesCurrent_56CD550F403469EB2D62CEBC2AA63A31" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_CD9EDFDEB0CF3DD4F1B8CEBC2AA65B7B" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_CD9EDFDEB0CF3DD4F1B8CEBC2AA65B7B" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NumberOfFacilities" xlink:label="loc_nrg_NumberOfFacilities_D7739B15EB59B9176949CEBC2AA6D903" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_nrg_NumberOfFacilities_D7739B15EB59B9176949CEBC2AA6D903" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_ABF5D14F70D936C7B391CEBC2AA64E4D" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_ABF5D14F70D936C7B391CEBC2AA64E4D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_4AB432C42A8B6571B724CEBC2AA6DF23" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_4AB432C42A8B6571B724CEBC2AA6DF23" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaap_EquityMethodInvestments_1809E10C81DE4D28B677CEBC2AA6782E" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_8380D01EFE4D3C531632CEBC2AA691A3" xlink:to="loc_us-gaap_EquityMethodInvestments_1809E10C81DE4D28B677CEBC2AA6782E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesDgpvDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_D441FB95441A2BC7D26DCEBC27F36F18" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_4FADC0F90626490E6BC8CEBC27F2417B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_D441FB95441A2BC7D26DCEBC27F36F18" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_4FADC0F90626490E6BC8CEBC27F2417B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_4DDE2C64EA08B381F873CEBC27F285C9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_4FADC0F90626490E6BC8CEBC27F2417B" xlink:to="loc_us-gaap_RangeAxis_4DDE2C64EA08B381F873CEBC27F285C9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_03D66B1843A71038E04BCEBC27F2BB9C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_4DDE2C64EA08B381F873CEBC27F285C9" xlink:to="loc_us-gaap_RangeMember_03D66B1843A71038E04BCEBC27F2BB9C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_03D66B1843A71038E04BCEBC27F2BB9C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_4DDE2C64EA08B381F873CEBC27F285C9" xlink:to="loc_us-gaap_RangeMember_03D66B1843A71038E04BCEBC27F2BB9C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_D77D786E3E5FA05E1B86CEBC27F2841B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_03D66B1843A71038E04BCEBC27F2BB9C" xlink:to="loc_us-gaap_MaximumMember_D77D786E3E5FA05E1B86CEBC27F2841B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_84C886B892DDBF32407ACEBC27F2BDB3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_4FADC0F90626490E6BC8CEBC27F2417B" xlink:to="loc_us-gaap_InvestmentTypeAxis_84C886B892DDBF32407ACEBC27F2BDB3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_C5F64FAE5C4747D83FD0CEBC27F2D430_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_84C886B892DDBF32407ACEBC27F2BDB3" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_C5F64FAE5C4747D83FD0CEBC27F2D430_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_C5F64FAE5C4747D83FD0CEBC27F2D430" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_84C886B892DDBF32407ACEBC27F2BDB3" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_C5F64FAE5C4747D83FD0CEBC27F2D430" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaxEquityFinancedPortfolioofLeasesCommercialPVMember" xlink:label="loc_nrg_TaxEquityFinancedPortfolioofLeasesCommercialPVMember_E5905A1E62B81252A2C4CEBC27F26CCB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_C5F64FAE5C4747D83FD0CEBC27F2D430" xlink:to="loc_nrg_TaxEquityFinancedPortfolioofLeasesCommercialPVMember_E5905A1E62B81252A2C4CEBC27F26CCB" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaxEquityFinancedPortfolioofLeasesCommunitySolarMember" xlink:label="loc_nrg_TaxEquityFinancedPortfolioofLeasesCommunitySolarMember_FDEEE81CF86DB6BC5A66CEBC27F22C51" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_C5F64FAE5C4747D83FD0CEBC27F2D430" xlink:to="loc_nrg_TaxEquityFinancedPortfolioofLeasesCommunitySolarMember_FDEEE81CF86DB6BC5A66CEBC27F22C51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_AA068F8488641A19FFCFCEBC27F22D2F" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_4FADC0F90626490E6BC8CEBC27F2417B" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_AA068F8488641A19FFCFCEBC27F22D2F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_12FD9A0D525A700F69B6CEBC27F2254F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_AA068F8488641A19FFCFCEBC27F22D2F" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_12FD9A0D525A700F69B6CEBC27F2254F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_12FD9A0D525A700F69B6CEBC27F2254F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_AA068F8488641A19FFCFCEBC27F22D2F" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_12FD9A0D525A700F69B6CEBC27F2254F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGDGPVHoldcoMember" xlink:label="loc_nrg_NRGDGPVHoldcoMember_3879C09135CD2139073BCEBC27F2D4BA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_12FD9A0D525A700F69B6CEBC27F2254F" xlink:to="loc_nrg_NRGDGPVHoldcoMember_3879C09135CD2139073BCEBC27F2D4BA" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGDGPVFund1Member" xlink:label="loc_nrg_NRGDGPVFund1Member_82B81C1BF9BF6F4ADAF6CEC213FB97FA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_12FD9A0D525A700F69B6CEBC27F2254F" xlink:to="loc_nrg_NRGDGPVFund1Member_82B81C1BF9BF6F4ADAF6CEC213FB97FA" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGDGPVFund2Member" xlink:label="loc_nrg_NRGDGPVFund2Member_17FE45AB2E8C97C30BDCCEBC27F235BE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_12FD9A0D525A700F69B6CEBC27F2254F" xlink:to="loc_nrg_NRGDGPVFund2Member_17FE45AB2E8C97C30BDCCEBC27F235BE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NumberofSolarLeasesinPortfolio" xlink:label="loc_nrg_NumberofSolarLeasesinPortfolio_ACBC9BE4A9B3529356E7CEBC27F3DE5F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_D441FB95441A2BC7D26DCEBC27F36F18" xlink:to="loc_nrg_NumberofSolarLeasesinPortfolio_ACBC9BE4A9B3529356E7CEBC27F3DE5F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_80A0315ECAB0B5BA8BC7CEBC27F34A40" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_D441FB95441A2BC7D26DCEBC27F36F18" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_80A0315ECAB0B5BA8BC7CEBC27F34A40" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DueToAffiliateCurrentAndNoncurrent" xlink:label="loc_us-gaap_DueToAffiliateCurrentAndNoncurrent_1BFD3D28D8038298B784CEBC27F381A2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_D441FB95441A2BC7D26DCEBC27F36F18" xlink:to="loc_us-gaap_DueToAffiliateCurrentAndNoncurrent_1BFD3D28D8038298B784CEBC27F381A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaap_EquityMethodInvestments_8D51DD62A5CF07D10940CEBC27F34A6D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_D441FB95441A2BC7D26DCEBC27F36F18" xlink:to="loc_us-gaap_EquityMethodInvestments_8D51DD62A5CF07D10940CEBC27F34A6D" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_A85F2A00EF8066DFCF3DCEBC27F3D035" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_D441FB95441A2BC7D26DCEBC27F36F18" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_A85F2A00EF8066DFCF3DCEBC27F3D035" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_RemainingLeaseTerm" xlink:label="loc_nrg_RemainingLeaseTerm_673DE6752079CB8AA953CEBC27F3B512" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_D441FB95441A2BC7D26DCEBC27F36F18" xlink:to="loc_nrg_RemainingLeaseTerm_673DE6752079CB8AA953CEBC27F3B512" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesGenconnDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_93F6725E7673DF71DD84CEBC286E93CD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_93F6725E7673DF71DD84CEBC286E93CD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_A2FBFC7BB497CA7565FACEBC286EEB2A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_93F6725E7673DF71DD84CEBC286E93CD" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_A2FBFC7BB497CA7565FACEBC286EEB2A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_CD46D79CF4A671E7A820CEBC286E405E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_A2FBFC7BB497CA7565FACEBC286EEB2A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_CD46D79CF4A671E7A820CEBC286E405E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_CD46D79CF4A671E7A820CEBC286E405E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_A2FBFC7BB497CA7565FACEBC286EEB2A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_CD46D79CF4A671E7A820CEBC286E405E" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_FixedRateNotesMember" xlink:label="loc_nrg_FixedRateNotesMember_6039B91ED983EED87E86CEBC286EC6BF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_CD46D79CF4A671E7A820CEBC286E405E" xlink:to="loc_nrg_FixedRateNotesMember_6039B91ED983EED87E86CEBC286EC6BF" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_WorkingCapitalFacilityMember" xlink:label="loc_nrg_WorkingCapitalFacilityMember_42B3595B21B0B5222D36CEBC286EBA63" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_CD46D79CF4A671E7A820CEBC286E405E" xlink:to="loc_nrg_WorkingCapitalFacilityMember_42B3595B21B0B5222D36CEBC286EBA63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_1F0953D24CC4B14DEDC9CEBC286E43D7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_93F6725E7673DF71DD84CEBC286E93CD" xlink:to="loc_dei_LegalEntityAxis_1F0953D24CC4B14DEDC9CEBC286E43D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_F460BB64D60E67946682CEBC286E548F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1F0953D24CC4B14DEDC9CEBC286E43D7" xlink:to="loc_dei_EntityDomain_F460BB64D60E67946682CEBC286E548F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_F460BB64D60E67946682CEBC286E548F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1F0953D24CC4B14DEDC9CEBC286E43D7" xlink:to="loc_dei_EntityDomain_F460BB64D60E67946682CEBC286E548F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_GenConnEnergyLlcMember" xlink:label="loc_nrg_GenConnEnergyLlcMember_A34DC471618AA3DCE95FCEBC286E100A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_F460BB64D60E67946682CEBC286E548F" xlink:to="loc_nrg_GenConnEnergyLlcMember_A34DC471618AA3DCE95FCEBC286E100A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_0620F27425FEB8231F67CEBC286E363C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_93F6725E7673DF71DD84CEBC286E93CD" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_0620F27425FEB8231F67CEBC286E363C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_F310AA756CDB6D1EF94ECEBC287D7A97_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_0620F27425FEB8231F67CEBC286E363C" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_F310AA756CDB6D1EF94ECEBC287D7A97_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_F310AA756CDB6D1EF94ECEBC287D7A97" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_0620F27425FEB8231F67CEBC286E363C" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_F310AA756CDB6D1EF94ECEBC287D7A97" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_GceHoldingLlcMember" xlink:label="loc_nrg_GceHoldingLlcMember_E41C36B2EC271B50FFA8CEBC287D5910" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_F310AA756CDB6D1EF94ECEBC287D7A97" xlink:to="loc_nrg_GceHoldingLlcMember_E41C36B2EC271B50FFA8CEBC287D5910" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_8F9AF92A4CB2B670E390CEBC287D11BB" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_93F6725E7673DF71DD84CEBC286E93CD" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_8F9AF92A4CB2B670E390CEBC287D11BB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_ACF3358115FC98DCB8D7CEBC287D6395_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_8F9AF92A4CB2B670E390CEBC287D11BB" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_ACF3358115FC98DCB8D7CEBC287D6395_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_ACF3358115FC98DCB8D7CEBC287D6395" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_8F9AF92A4CB2B670E390CEBC287D11BB" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_ACF3358115FC98DCB8D7CEBC287D6395" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_B1EFD388410745F4B212CEBC287D638D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_Revenues_B1EFD388410745F4B212CEBC287D638D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_D9EE634F40C76023EEEDCEBC287DE046" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_OperatingIncomeLoss_D9EE634F40C76023EEEDCEBC287DE046" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_C9A49E3A0F3A16648FECCEBC287DD174" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_ProfitLoss_C9A49E3A0F3A16648FECCEBC287DD174" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_E520ED2217FAD895C8F0CEBC287D0795" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_E520ED2217FAD895C8F0CEBC287D0795" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_ACE3540D28158B1F8DA7CECD5104588F" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_ACE3540D28158B1F8DA7CECD5104588F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationUnitsNumber" xlink:label="loc_nrg_PowerGenerationUnitsNumber_7AF9102E73096D2CD2E5CEBC287D7756" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_nrg_PowerGenerationUnitsNumber_7AF9102E73096D2CD2E5CEBC287D7756" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_DA2F9837B6E28CA2958ACEBC287D0729" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_DA2F9837B6E28CA2958ACEBC287D0729" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaap_EquityMethodInvestments_848AF978EFC7E1B96B2ECEBC287D58B1" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_EquityMethodInvestments_848AF978EFC7E1B96B2ECEBC287D58B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2D722E28246166927FF0CEBC287DECD2" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2D722E28246166927FF0CEBC287DECD2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_96B2D589A99357EC65DBCEBC287D4457" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_96B2D589A99357EC65DBCEBC287D4457" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_C55E881D6BA4AA546063CEBC287DB7EE" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_LongTermDebt_C55E881D6BA4AA546063CEBC287DB7EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_199C21ADF4B3A5037E06CEBC287D553A" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_199C21ADF4B3A5037E06CEBC287D553A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_B9095CB7A3205E4F33D3CEBC287DE220" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_AssetsCurrent_B9095CB7A3205E4F33D3CEBC287DE220" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaap_AssetsNoncurrent_CEF86818280AC1186E51CEBC287DDB89" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_AssetsNoncurrent_CEF86818280AC1186E51CEBC287DDB89" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_9A7ADA45D764F19FB7CFCEBC287D8986" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_LiabilitiesCurrent_9A7ADA45D764F19FB7CFCEBC287D8986" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_ADDD150A4305A4D3C322CEBC287D38C6" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_E8590AB98011A049C29ECEBC287DB54D" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_ADDD150A4305A4D3C322CEBC287D38C6" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesVariableInterestEntitiesRpvDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9DEED0B17E2BE066B7FC993CFE92C765" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_EBCAEA4EE9A61A3D4E43993CFE916D74" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9DEED0B17E2BE066B7FC993CFE92C765" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_EBCAEA4EE9A61A3D4E43993CFE916D74" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_A3FC80621EE78CBDCE33993CFE914DE8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_EBCAEA4EE9A61A3D4E43993CFE916D74" xlink:to="loc_us-gaap_RangeAxis_A3FC80621EE78CBDCE33993CFE914DE8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_460EA7405E0475429528993CFE9140F2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_A3FC80621EE78CBDCE33993CFE914DE8" xlink:to="loc_us-gaap_RangeMember_460EA7405E0475429528993CFE9140F2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_460EA7405E0475429528993CFE9140F2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_A3FC80621EE78CBDCE33993CFE914DE8" xlink:to="loc_us-gaap_RangeMember_460EA7405E0475429528993CFE9140F2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_CA42D6E0C044B923C523993CFE91D114" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_460EA7405E0475429528993CFE9140F2" xlink:to="loc_us-gaap_MinimumMember_CA42D6E0C044B923C523993CFE91D114" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_4D1375238C5C136A4A7A993CFE9155F1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_460EA7405E0475429528993CFE9140F2" xlink:to="loc_us-gaap_MaximumMember_4D1375238C5C136A4A7A993CFE9155F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_C03EF390C5FF257A0D7A993CFE9129E4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_EBCAEA4EE9A61A3D4E43993CFE916D74" xlink:to="loc_us-gaap_InvestmentTypeAxis_C03EF390C5FF257A0D7A993CFE9129E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_633243572105F32364AE993CFE91DF9F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_C03EF390C5FF257A0D7A993CFE9129E4" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_633243572105F32364AE993CFE91DF9F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_633243572105F32364AE993CFE91DF9F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_C03EF390C5FF257A0D7A993CFE9129E4" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_633243572105F32364AE993CFE91DF9F" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_ExistingPortfolioofLeasesMember" xlink:label="loc_nrg_ExistingPortfolioofLeasesMember_32BADE7744AAA8F967E2993CFE9139BE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_633243572105F32364AE993CFE91DF9F" xlink:to="loc_nrg_ExistingPortfolioofLeasesMember_32BADE7744AAA8F967E2993CFE9139BE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_TaxEquityFinancedPortfolioofLeasesMember" xlink:label="loc_nrg_TaxEquityFinancedPortfolioofLeasesMember_B2FA192B888A85A2E680993CFE919267" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_633243572105F32364AE993CFE91DF9F" xlink:to="loc_nrg_TaxEquityFinancedPortfolioofLeasesMember_B2FA192B888A85A2E680993CFE919267" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_8F5B0E40AB3295B70F5D993CFE92B1C7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_EBCAEA4EE9A61A3D4E43993CFE916D74" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_8F5B0E40AB3295B70F5D993CFE92B1C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_3D216C77FCA928079CCB993CFE922772_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_8F5B0E40AB3295B70F5D993CFE92B1C7" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_3D216C77FCA928079CCB993CFE922772_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_3D216C77FCA928079CCB993CFE922772" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_8F5B0E40AB3295B70F5D993CFE92B1C7" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_3D216C77FCA928079CCB993CFE922772" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NRGRPVHoldcoMember" xlink:label="loc_nrg_NRGRPVHoldcoMember_B6D74F403B7E8404CFA5993CFE9270D9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_3D216C77FCA928079CCB993CFE922772" xlink:to="loc_nrg_NRGRPVHoldcoMember_B6D74F403B7E8404CFA5993CFE9270D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_A7C6917C366FF9543788993CFE927924" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_EBCAEA4EE9A61A3D4E43993CFE916D74" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_A7C6917C366FF9543788993CFE927924" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_3194B09771CFA3545185993CFE928B7C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_A7C6917C366FF9543788993CFE927924" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_3194B09771CFA3545185993CFE928B7C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_3194B09771CFA3545185993CFE928B7C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_A7C6917C366FF9543788993CFE927924" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_3194B09771CFA3545185993CFE928B7C" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_NumberofSolarLeasesinPortfolio" xlink:label="loc_nrg_NumberofSolarLeasesinPortfolio_1EE12567B94B6315F0B2993CFE9286E4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9DEED0B17E2BE066B7FC993CFE92C765" xlink:to="loc_nrg_NumberofSolarLeasesinPortfolio_1EE12567B94B6315F0B2993CFE9286E4" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_PowerGenerationCapacityMegawatts" xlink:label="loc_nrg_PowerGenerationCapacityMegawatts_3D33524FE5CBAB0D190E993CFE9268BE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9DEED0B17E2BE066B7FC993CFE92C765" xlink:to="loc_nrg_PowerGenerationCapacityMegawatts_3D33524FE5CBAB0D190E993CFE9268BE" xlink:type="arc" />
    <loc xlink:href="nrg-20150930.xsd#nrg_RemainingLeaseTerm" xlink:label="loc_nrg_RemainingLeaseTerm_9A5ABC61770CE71FB8E1993CFE926F95" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9DEED0B17E2BE066B7FC993CFE92C765" xlink:to="loc_nrg_RemainingLeaseTerm_9A5ABC61770CE71FB8E1993CFE926F95" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaap_EquityMethodInvestments_74AB536999AB33A87776993CFE92FEE6" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9DEED0B17E2BE066B7FC993CFE92C765" xlink:to="loc_us-gaap_EquityMethodInvestments_74AB536999AB33A87776993CFE92FEE6" xlink:type="arc" />
  </definitionLink>
</linkbase>





