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  <xsd:element id="pnw_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeGainLossDeferredAsRegulatoryAssetOrLiability" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeGainLossDeferredAsRegulatoryAssetOrLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_FilingWithArizonaCorporationCommissionMember" name="FilingWithArizonaCorporationCommissionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_FinancialAssurancesAbstract" name="FinancialAssurancesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_ForwardComponentOfPSARate" name="ForwardComponentOfPSARate" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_FourCornersCoalReclamationMember" name="FourCornersCoalReclamationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_FourCornersCostDeferralMember" name="FourCornersCostDeferralMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_FourCornersMember" name="FourCornersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_FourCornersUnits4And5Member" name="FourCornersUnits4And5Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_GainContingencyNewClaimsFiledNumber" name="GainContingencyNewClaimsFiledNumber" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_GainContingencyNumberofSettlementAgreementTimePeriods" name="GainContingencyNumberofSettlementAgreementTimePeriods" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_GainonDispositionofPropertyPlantEquipment" name="GainonDispositionofPropertyPlantEquipment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pnw_GrossAssetsFairValueDisclosure" name="GrossAssetsFairValueDisclosure" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pnw_HistoricalComponentOfPSARate" name="HistoricalComponentOfPSARate" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization" name="IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_IncreaseinAmountofAdjustmentRepresentingProratedSalesLosses" name="IncreaseinAmountofAdjustmentRepresentingProratedSalesLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_InvestmentsAndOtherAssetsAbstract" name="InvestmentsAndOtherAssetsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_LettersofCreditExpiringin2017Member" name="LettersofCreditExpiringin2017Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity" name="LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pnw_LineOfCreditFacilityNumberOfAgreements" name="LineOfCreditFacilityNumberOfAgreements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_LossContingencyAssessmentShare" name="LossContingencyAssessmentShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_LossContingencyCoalSeveranceSurtaxPenaltyAndInterest" name="LossContingencyCoalSeveranceSurtaxPenaltyAndInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_LossContingencyPartialPaymentofAssessment" name="LossContingencyPartialPaymentofAssessment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_LossonDispositionofPropertyPlantEquipment" name="LossonDispositionofPropertyPlantEquipment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_LostFixedCostRecoveryMechanismsMember" name="LostFixedCostRecoveryMechanismsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_LostFixedCostRecoveryMember" name="LostFixedCostRecoveryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies" name="MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_MaximumAssessmentPerReactorForEachNuclearIncident" name="MaximumAssessmentPerReactorForEachNuclearIncident" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_MaximumAvailableNuclearLiabilityInsurance" name="MaximumAvailableNuclearLiabilityInsurance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_MaximumInsuranceCoveragePerIncident" name="MaximumInsuranceCoveragePerIncident" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_MaximumPotentialRetrospectiveAssessmentPerIncident" name="MaximumPotentialRetrospectiveAssessmentPerIncident" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_MeadPhoenixtransmissionlineCIACMember" name="MeadPhoenixtransmissionlineCIACMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_MercuryandAirToxicStandardsMember" name="MercuryandAirToxicStandardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_MiscellaneousOtherNonoperatingExpense" name="MiscellaneousOtherNonoperatingExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_MiscellaneousOtherNonoperatingIncome" name="MiscellaneousOtherNonoperatingIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_NaturalGasContractsMember" name="NaturalGasContractsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_NaturalGasTollingLetterOfCreditMember" name="NaturalGasTollingLetterOfCreditMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_NavajoGeneratingStationMember" name="NavajoGeneratingStationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_NetMeteringMember" name="NetMeteringMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_NewMexicoTaxMatterMember" name="NewMexicoTaxMatterMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue" name="NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pnw_NonoperatingCosts" name="NonoperatingCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_NonoperatingIncomeTaxExpenseBenefit" name="NonoperatingIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pnw_NumberOfLettersOfCreditExpiring" name="NumberOfLettersOfCreditExpiring" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_NumberOfVIELessorTrusts" name="NumberOfVIELessorTrusts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pnw_OffsettingAssetsAndLiabilitiesLineItems" name="OffsettingAssetsAndLiabilitiesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_OffsettingAssetsAndLiabilitiesTable" name="OffsettingAssetsAndLiabilitiesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_OffsettingDerivativeAssetsLiabilitiesNetAbstract" name="OffsettingDerivativeAssetsLiabilitiesNetAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_OpenAccessTransmissionTariffMember" name="OpenAccessTransmissionTariffMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_OperatingIncomeTaxExpenseBenefit" name="OperatingIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_OptionModelValuationTechniqueMember" name="OptionModelValuationTechniqueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_OtherRegulatoryLiabilitiesMember" name="OtherRegulatoryLiabilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PSARate" name="PSARate" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PSARateInPriorYears" name="PSARateInPriorYears" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_PensionMember" name="PensionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PercentageOfShareOfCostOfControl" name="PercentageOfShareOfCostOfControl" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PercentageOfUnrealizedGainsAndLossesOnCertainDerivativesDeferredForFutureRateTreatment" name="PercentageOfUnrealizedGainsAndLossesOnCertainDerivativesDeferredForFutureRateTreatment" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers" name="PeriodToProvideCollateralAssuranceBasedOnRatingTriggers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PowerOutageCapacityofTransmissionLinethatTrippedoutofService" name="PowerOutageCapacityofTransmissionLinethatTrippedoutofService" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PowerOutageNumberOfCustomersLosingService" name="PowerOutageNumberOfCustomersLosingService" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PowerOutagePeriodOverWhichGenerationAndTransmissionResourcesWereLost" name="PowerOutagePeriodOverWhichGenerationAndTransmissionResourcesWereLost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_PowerSupplyAdjustorMember" name="PowerSupplyAdjustorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops" name="PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis" name="PublicUtilitiesRegulatoryRegulatoryMattersAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_PublicUtilitiesRegulatoryRegulatoryMattersDomain" name="PublicUtilitiesRegulatoryRegulatoryMattersDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity" name="PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity" nillable="true" substitutionGroup="xbrli:item" type="num:powerItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarNumberofCustomers" name="PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarNumberofCustomers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_PublicUtilityOrderCommonStockholdersEquityRatio" name="PublicUtilityOrderCommonStockholdersEquityRatio" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_PublicUtilityOrderDividendRestrictionsShareholderEquity" name="PublicUtilityOrderDividendRestrictionsShareholderEquity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pnw_PublicUtilityProgramAxis" name="PublicUtilityProgramAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_PublicUtilityProgramDomain" name="PublicUtilityProgramDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateBenefitsPreservationInitiativeNumberofSignaturesRequired" name="RateBenefitsPreservationInitiativeNumberofSignaturesRequired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterApprovedBudget" name="RateMatterApprovedBudget" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill" name="RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterBaseFuelRateCurrent" name="RateMatterBaseFuelRateCurrent" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterCapPercentageOfRetailRevenue" name="RateMatterCapPercentageOfRetailRevenue" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_RateMatterChargeOnFutureCustomersWhoInstallRooftopSolarPanels" name="RateMatterChargeOnFutureCustomersWhoInstallRooftopSolarPanels" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterEstimatedMonthlyCollectionDueToChargeOnFutureCustomersWhoInstallRooftopSolarPanels" name="RateMatterEstimatedMonthlyCollectionDueToChargeOnFutureCustomersWhoInstallRooftopSolarPanels" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterFindingsPeriod" name="RateMatterFindingsPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost" name="RateMatterFixedCostRecoverablePerNonResidentialPowerLost" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost" name="RateMatterFixedCostRecoverablePerResidentialPowerLost" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterNumberofResourceSavingsProjects" name="RateMatterNumberofResourceSavingsProjects" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_RateMatterPlanTerm" name="RateMatterPlanTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterProcessPeriod" name="RateMatterProcessPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RateMatterProposedBudget" name="RateMatterProposedBudget" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pnw_RateMattersIncreaseInCostRecovery" name="RateMattersIncreaseInCostRecovery" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_RegionalHazeRulesMember" name="RegionalHazeRulesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent" name="RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pnw_RegulatoryAssetNetBookValue" name="RegulatoryAssetNetBookValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pnw_RegulatoryAssetNoncurrentAmortizationPeriod" name="RegulatoryAssetNoncurrentAmortizationPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent" name="RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pnw_RegulatoryMattersTextBlock" name="RegulatoryMattersTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram" name="RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_RetailRateCaseFilingMember" name="RetailRateCaseFilingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_RetiredPowerPlantCostsMember" name="RetiredPowerPlantCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_RevolvingCreditFacilitiesMaturingin2020and2019Member" name="RevolvingCreditFacilitiesMaturingin2020and2019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_RevolvingCreditFacilityMaturingMay2019Member" name="RevolvingCreditFacilityMaturingMay2019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_RevolvingCreditFacilityMaturingSeptember2020Member" name="RevolvingCreditFacilityMaturingSeptember2020Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_SaleLeasebackTransactionLeasePeriod" name="SaleLeasebackTransactionLeasePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod" name="SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_SaleLeasebackTransactionPeriod2016Through2023Member" name="SaleLeasebackTransactionPeriod2016Through2023Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_SaleLeasebackTransactionPeriod2024Through2033Member" name="SaleLeasebackTransactionPeriod2024Through2033Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_SaleLeasebackTransactionPeriodAxis" name="SaleLeasebackTransactionPeriodAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_SaleLeasebackTransactionPeriodDomain" name="SaleLeasebackTransactionPeriodDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_SaleLeasebackTransactionPeriodThrough2023Member" name="SaleLeasebackTransactionPeriodThrough2023Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_SaleLeasebackTransactionPeriodThrough2033Member" name="SaleLeasebackTransactionPeriodThrough2033Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_ScheduleOfCommitmentsAndContingenciesTable" name="ScheduleOfCommitmentsAndContingenciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_ScheduleOfDeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityTableTextBlock" name="ScheduleOfDeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_ScheduleOfDerivativeCreditRiskRelatedContingentFeaturesTableTextBlock" name="ScheduleOfDerivativeCreditRiskRelatedContingentFeaturesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock" name="ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_SettlementAgreementBaseFuelRateProposed" name="SettlementAgreementBaseFuelRateProposed" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_SettlementAgreementCurrentSharingProvisionOfFuelAndPurchasedPowerCostsElimination" name="SettlementAgreementCurrentSharingProvisionOfFuelAndPurchasedPowerCostsElimination" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_SettlementAgreementFuelRelatedBaseRateDecrease" name="SettlementAgreementFuelRelatedBaseRateDecrease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pnw_SettlementAgreementModificationsToEISCostRecovery" name="SettlementAgreementModificationsToEISCostRecovery" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pnw_SettlementAgreementNonFuelBaseRateIncrease" name="SettlementAgreementNonFuelBaseRateIncrease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pnw_SettlementAgreementPercentageOfDeferralOfPropertyTaxesIfArizonaPropertyTaxRatesDecrease" name="SettlementAgreementPercentageOfDeferralOfPropertyTaxesIfArizonaPropertyTaxRatesDecrease" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_SettlementAgreementPercentageOfDeferralOfPropertyTaxesIfArizonaPropertyTaxRatesIncreaseYearOne" name="SettlementAgreementPercentageOfDeferralOfPropertyTaxesIfArizonaPropertyTaxRatesIncreaseYearOne" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_SettlementAgreementPercentageOfDeferralOfPropertyTaxesIfArizonaPropertyTaxRatesIncreaseYearThreeAndThereafter" name="SettlementAgreementPercentageOfDeferralOfPropertyTaxesIfArizonaPropertyTaxRatesIncreaseYearThreeAndThereafter" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_SettlementAgreementPercentageOfDeferralOfPropertyTaxesIfArizonaPropertyTaxRatesIncreaseYearTwo" name="SettlementAgreementPercentageOfDeferralOfPropertyTaxesIfArizonaPropertyTaxRatesIncreaseYearTwo" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates" name="SettlementAgreementTransferOfCostRecoveryToBaseRates" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pnw_SettlementagreementACCapprovedrateadjustmentannualizedcustomerimpact" name="SettlementagreementACCapprovedrateadjustmentannualizedcustomerimpact" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pnw_ShareholderEquityAndLongTermDebtAndCurrentMaturities" name="ShareholderEquityAndLongTermDebtAndCurrentMaturities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pnw_SouthernCaliforniaEdisonCompanyMember" name="SouthernCaliforniaEdisonCompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_SpentNuclearFuelMember" name="SpentNuclearFuelMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_SundanceMaintenanceMember" name="SundanceMaintenanceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_TaxExpenseOfMedicareSubsidyMember" name="TaxExpenseOfMedicareSubsidyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_TermLoanFacilityMaturingApril222019Member" name="TermLoanFacilityMaturingApril222019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_TermLoanMember" name="TermLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_TotalDeferredDebits" name="TotalDeferredDebits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pnw_TotalInvestmentsAndOtherAssets" name="TotalInvestmentsAndOtherAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pnw_TransitionComponentofPSARate" name="TransitionComponentofPSARate" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_TransmissionCostAdjustorMember" name="TransmissionCostAdjustorMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_TransmissionTerminationAgreementNetReceiptDueToNegotiationOfAlternateArrangement" name="TransmissionTerminationAgreementNetReceiptDueToNegotiationOfAlternateArrangement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_TransmissionVegetationManagementMember" name="TransmissionVegetationManagementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_USCommingledFundsMember" name="USCommingledFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember" name="UnitedStatesFederalEnergyRegulatoryCommissionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_VariableInterestEntitiesAbstract" name="VariableInterestEntitiesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount" name="VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount" name="VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_YearOfCasesDomain" name="YearOfCasesDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pnw_YearOfRateCasesAxis" name="YearOfRateCasesAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
</xsd:schema>


