0000764622false12/312021Q20000007286false12/312021Q20000764622pnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-3000007646222021-01-012021-06-30xbrli:shares00007646222021-07-290000764622pnw:ArizonaPublicServiceCompanyMember2021-07-29iso4217:USD00007646222021-04-012021-06-3000007646222020-04-012020-06-3000007646222020-01-012020-06-30iso4217:USDxbrli:shares00007646222021-06-3000007646222020-12-3100007646222019-12-3100007646222020-06-300000764622us-gaap:CommonStockMember2021-03-310000764622us-gaap:TreasuryStockMember2021-03-310000764622us-gaap:RetainedEarningsMember2021-03-310000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000764622us-gaap:NoncontrollingInterestMember2021-03-3100007646222021-03-310000764622us-gaap:RetainedEarningsMember2021-04-012021-06-300000764622us-gaap:NoncontrollingInterestMember2021-04-012021-06-300000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000764622us-gaap:CommonStockMember2021-04-012021-06-300000764622us-gaap:TreasuryStockMember2021-04-012021-06-300000764622us-gaap:CommonStockMember2021-06-300000764622us-gaap:TreasuryStockMember2021-06-300000764622us-gaap:RetainedEarningsMember2021-06-300000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000764622us-gaap:NoncontrollingInterestMember2021-06-300000764622us-gaap:CommonStockMember2020-03-310000764622us-gaap:TreasuryStockMember2020-03-310000764622us-gaap:RetainedEarningsMember2020-03-310000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-03-310000764622us-gaap:NoncontrollingInterestMember2020-03-3100007646222020-03-310000764622us-gaap:RetainedEarningsMember2020-04-012020-06-300000764622us-gaap:NoncontrollingInterestMember2020-04-012020-06-300000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-04-012020-06-300000764622us-gaap:CommonStockMember2020-04-012020-06-300000764622us-gaap:TreasuryStockMember2020-04-012020-06-300000764622us-gaap:CommonStockMember2020-06-300000764622us-gaap:TreasuryStockMember2020-06-300000764622us-gaap:RetainedEarningsMember2020-06-300000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-300000764622us-gaap:NoncontrollingInterestMember2020-06-300000764622us-gaap:CommonStockMember2020-12-310000764622us-gaap:TreasuryStockMember2020-12-310000764622us-gaap:RetainedEarningsMember2020-12-310000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000764622us-gaap:NoncontrollingInterestMember2020-12-310000764622us-gaap:RetainedEarningsMember2021-01-012021-06-300000764622us-gaap:NoncontrollingInterestMember2021-01-012021-06-300000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-06-300000764622us-gaap:CommonStockMember2021-01-012021-06-300000764622us-gaap:TreasuryStockMember2021-01-012021-06-300000764622us-gaap:CommonStockMember2019-12-310000764622us-gaap:TreasuryStockMember2019-12-310000764622us-gaap:RetainedEarningsMember2019-12-310000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000764622us-gaap:NoncontrollingInterestMember2019-12-310000764622us-gaap:RetainedEarningsMember2020-01-012020-06-300000764622us-gaap:NoncontrollingInterestMember2020-01-012020-06-300000764622us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-06-300000764622us-gaap:CommonStockMember2020-01-012020-06-300000764622us-gaap:TreasuryStockMember2020-01-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMember2021-04-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMember2020-04-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMember2020-01-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:ArizonaPublicServiceCompanyMember2020-12-310000764622pnw:ArizonaPublicServiceCompanyMember2019-12-310000764622pnw:ArizonaPublicServiceCompanyMember2020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:CommonStockMember2021-03-310000764622us-gaap:AdditionalPaidInCapitalMemberpnw:ArizonaPublicServiceCompanyMember2021-03-310000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2021-03-310000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2021-03-310000764622pnw:ArizonaPublicServiceCompanyMember2021-03-310000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2021-04-012021-06-300000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2021-04-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:CommonStockMember2021-06-300000764622us-gaap:AdditionalPaidInCapitalMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:CommonStockMember2020-03-310000764622us-gaap:AdditionalPaidInCapitalMemberpnw:ArizonaPublicServiceCompanyMember2020-03-310000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2020-03-310000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-03-310000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2020-03-310000764622pnw:ArizonaPublicServiceCompanyMember2020-03-310000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2020-04-012020-06-300000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2020-04-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-04-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:CommonStockMember2020-06-300000764622us-gaap:AdditionalPaidInCapitalMemberpnw:ArizonaPublicServiceCompanyMember2020-06-300000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-300000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:CommonStockMember2020-12-310000764622us-gaap:AdditionalPaidInCapitalMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:CommonStockMember2019-12-310000764622us-gaap:AdditionalPaidInCapitalMemberpnw:ArizonaPublicServiceCompanyMember2019-12-310000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2019-12-310000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2019-12-310000764622us-gaap:RetainedEarningsMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-06-300000764622us-gaap:NoncontrollingInterestMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-06-300000764622pnw:RetailResidentialMemberpnw:ElectricServiceMember2021-04-012021-06-300000764622pnw:RetailResidentialMemberpnw:ElectricServiceMember2020-04-012020-06-300000764622pnw:RetailResidentialMemberpnw:ElectricServiceMember2021-01-012021-06-300000764622pnw:RetailResidentialMemberpnw:ElectricServiceMember2020-01-012020-06-300000764622pnw:RetailNonResidentialMemberpnw:ElectricServiceMember2021-04-012021-06-300000764622pnw:RetailNonResidentialMemberpnw:ElectricServiceMember2020-04-012020-06-300000764622pnw:RetailNonResidentialMemberpnw:ElectricServiceMember2021-01-012021-06-300000764622pnw:RetailNonResidentialMemberpnw:ElectricServiceMember2020-01-012020-06-300000764622pnw:WholesaleMemberpnw:ElectricServiceMember2021-04-012021-06-300000764622pnw:WholesaleMemberpnw:ElectricServiceMember2020-04-012020-06-300000764622pnw:WholesaleMemberpnw:ElectricServiceMember2021-01-012021-06-300000764622pnw:WholesaleMemberpnw:ElectricServiceMember2020-01-012020-06-300000764622pnw:TransmissionServicesMember2021-04-012021-06-300000764622pnw:TransmissionServicesMember2020-04-012020-06-300000764622pnw:TransmissionServicesMember2021-01-012021-06-300000764622pnw:TransmissionServicesMember2020-01-012020-06-300000764622pnw:OtherServicesMember2021-04-012021-06-300000764622pnw:OtherServicesMember2020-04-012020-06-300000764622pnw:OtherServicesMember2021-01-012021-06-300000764622pnw:OtherServicesMember2020-01-012020-06-300000764622pnw:ElectricandTransmissionServiceMember2021-04-012021-06-300000764622pnw:ElectricandTransmissionServiceMember2021-01-012021-06-300000764622pnw:ElectricandTransmissionServiceMember2020-04-012020-06-300000764622pnw:ElectricandTransmissionServiceMember2020-01-012020-06-3000007646222020-01-012020-12-310000764622srt:ParentCompanyMemberpnw:TermLoanMember2020-05-040000764622srt:ParentCompanyMemberpnw:TermLoanMember2020-05-05xbrli:pure0000764622srt:ParentCompanyMemberpnw:TermLoanMember2021-01-012021-06-300000764622pnw:TermLoanMember2020-12-230000764622us-gaap:RevolvingCreditFacilityMembersrt:ParentCompanyMemberpnw:RevolvingCreditFacilityMaturingJuly2023Member2021-05-270000764622us-gaap:RevolvingCreditFacilityMembersrt:ParentCompanyMemberpnw:RevolvingCreditFacilityMaturingMay2026Member2021-06-300000764622srt:ParentCompanyMemberpnw:RevolvingCreditFacilityMaturingMay2026Memberus-gaap:LetterOfCreditMember2021-06-300000764622us-gaap:CommercialPaperMembersrt:ParentCompanyMemberpnw:RevolvingCreditFacilityMaturingMay2026Member2021-06-30pnw:Facility0000764622us-gaap:RevolvingCreditFacilityMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RevolvingCreditFacilityMaturingin2022and2023Member2021-05-270000764622pnw:RevolvingCreditFacilityMaturingJune2022Memberus-gaap:RevolvingCreditFacilityMemberpnw:ArizonaPublicServiceCompanyMember2021-05-270000764622us-gaap:RevolvingCreditFacilityMemberpnw:RevolvingCreditFacilityMaturingJuly2023Memberpnw:ArizonaPublicServiceCompanyMember2021-05-270000764622us-gaap:RevolvingCreditFacilityMemberpnw:RevolvingCreditFacilityMaturingMay2026Memberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:RevolvingCreditFacilityMemberpnw:RevolvingCreditFacilityMaturingMay2026FacilityOneMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:RevolvingCreditFacilityMemberpnw:RevolvingCreditFacilityMaturingMay2026FacilityTwoMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:CommercialPaperMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:RevolvingCreditFacilityMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RevolvingCreditFacilityMaturingin2022and2023Member2021-06-300000764622us-gaap:LetterOfCreditMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RevolvingCreditFacilityMaturingin2022and2023Member2021-06-300000764622us-gaap:CommercialPaperMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RevolvingCreditFacilityMaturingin2022and2023Member2021-06-3000007646222020-12-170000764622pnw:ArizonaPublicServiceCompanyMember2020-12-170000764622srt:ParentCompanyMember2021-06-300000764622srt:ParentCompanyMember2020-12-310000764622us-gaap:DamageFromFireExplosionOrOtherHazardMemberpnw:ArizonaPublicServiceCompanyMember2021-01-212021-01-210000764622us-gaap:DamageFromFireExplosionOrOtherHazardMemberpnw:ArizonaPublicServiceCompanyMember2021-01-210000764622pnw:ArizonaPublicServiceCompanyMember2021-02-012021-02-280000764622pnw:ArizonaPublicServiceCompanyMember2020-05-050000764622pnw:ArizonaPublicServiceCompanyMember2020-12-012020-12-310000764622srt:MinimumMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2019-10-312019-10-310000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2019-10-312019-10-310000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2019-10-312019-10-310000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2019-06-302019-06-300000764622pnw:ArizonaPublicServiceCompanyMember2019-10-312019-10-310000764622pnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2019-10-312019-10-31iso4217:USDutr:kWhutr:GW0000764622pnw:ArizonaCorporationCommissionMember2020-10-020000764622pnw:ResidentialUtilityConsumerOfficeMember2020-10-020000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2020-10-022020-10-020000764622pnw:ArizonaCorporationCommissionMember2020-11-060000764622pnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMember2020-11-060000764622pnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMember2020-11-062020-11-060000764622pnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMemberpnw:NavajoNationEconomicDevelopmentOrganizationMember2020-11-060000764622pnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMemberpnw:NavajoNationEconomicDevelopmentOrganizationMember2020-11-062020-11-060000764622pnw:NavajoNationElectrificationProjectsMemberpnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMember2020-11-060000764622pnw:ArizonaCorporationCommissionMemberpnw:NavajoNationTransmissionRevenueSharingMemberpnw:CoalCommunityTransitionPlanMember2020-11-060000764622pnw:NavajoCountyCommunitiesChollaPowerPlantClosureMemberpnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMember2020-11-060000764622pnw:NavajoCountyCommunitiesChollaPowerPlantClosureMemberpnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMember2020-11-062020-11-060000764622pnw:NavajoNationGenerationStationMemberpnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMember2020-11-060000764622pnw:ArizonaCorporationCommissionMemberpnw:CoalCommunityTransitionPlanMember2020-12-310000764622pnw:ArizonaCorporationCommissionMember2020-12-040000764622pnw:ResidentialUtilityConsumerOfficeMember2020-12-040000764622us-gaap:SubsequentEventMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2021-08-020000764622us-gaap:SubsequentEventMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:CoalCommunityTransitionPlanMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMemberpnw:NavajoNationEconomicDevelopmentOrganizationMember2021-08-020000764622us-gaap:SubsequentEventMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:CoalCommunityTransitionPlanMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMemberpnw:NavajoNationEconomicDevelopmentOrganizationMember2021-08-022021-08-020000764622us-gaap:SubsequentEventMemberpnw:NavajoCountyCommunitiesChollaPowerPlantClosureMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:CoalCommunityTransitionPlanMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2021-08-020000764622us-gaap:SubsequentEventMemberpnw:NavajoCountyCommunitiesChollaPowerPlantClosureMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:CoalCommunityTransitionPlanMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2021-08-022021-08-020000764622pnw:NavajoNationHopiTribeMemberus-gaap:SubsequentEventMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:CoalCommunityTransitionPlanMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2021-08-020000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2017-03-272017-03-270000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMemberpnw:AZSunProgramPhase2Member2017-03-272017-03-270000764622srt:MinimumMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMember2017-03-272017-03-270000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:RetailRateCaseFilingwithArizonaCorporationCommissionMembersrt:MaximumMember2017-03-272017-03-270000764622pnw:ArizonaRenewableEnergyStandardAndTariffMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:ArizonaRenewableEnergyStandardandTariff2018Memberpnw:SolarCommunitiesMember2017-11-202017-11-200000764622srt:MinimumMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaRenewableEnergyStandardandTariff2018Memberpnw:ArizonaPublicServiceCompanyMemberpnw:SolarCommunitiesMember2017-11-202017-11-200000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaRenewableEnergyStandardandTariff2018Memberpnw:ArizonaPublicServiceCompanyMembersrt:MaximumMemberpnw:SolarCommunitiesMember2017-11-202017-11-200000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:ArizonaRenewableEnergyStandardandTariff2018Member2019-07-010000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:ArizonaRenewableEnergyStandardandTariff2018Member2020-07-010000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:ArizonaRenewableEnergyStandardandTariff2018Member2021-06-072021-06-070000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:ArizonaRenewableEnergyStandardandTariff2018Member2021-07-010000764622pnw:DemandSideManagementAdjustorCharge2018Memberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2017-09-010000764622pnw:DemandSideManagementAdjustorCharge2018Memberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2017-11-140000764622pnw:DemandSideManagementAdjustorCharge2019Memberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2018-12-310000764622pnw:DemandSideManagementAdjustorCharge2020Memberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2019-12-310000764622pnw:DemandSideManagementAdjustorCharge2020Memberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2020-05-150000764622pnw:DemandSideManagementAdjustorCharge2021Memberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2020-12-310000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2019-12-310000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2021-01-012021-06-300000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2020-01-012020-06-300000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2021-06-300000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2020-06-300000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2019-02-012019-02-010000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2018-02-012018-02-010000764622pnw:CostRecoveryMechanismsMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2019-02-012019-02-010000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2020-02-012020-02-010000764622pnw:CostRecoveryMechanismsMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2020-02-012020-02-010000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2021-02-012021-02-010000764622pnw:CostRecoveryMechanismsMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2021-02-012021-02-010000764622pnw:ArizonaPublicServiceCompanyMember2021-03-012021-03-310000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2021-04-012021-04-010000764622srt:ScenarioForecastMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2021-11-012021-11-01pnw:agreement0000764622pnw:CostRecoveryMechanismsMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMemberpnw:PowerSupplyAdjustorMember2019-03-150000764622pnw:ArizonaPublicServiceCompanyMemberpnw:EnvironmentalImprovementSurchargeMemberpnw:UnitedStatesFederalEnergyRegulatoryCommissionMember2021-02-012021-02-010000764622pnw:OpenAccessTransmissionTariffMemberpnw:ArizonaPublicServiceCompanyMemberpnw:UnitedStatesFederalEnergyRegulatoryCommissionMember2019-06-012019-06-010000764622pnw:OpenAccessTransmissionTariffMemberpnw:ArizonaPublicServiceCompanyMemberpnw:UnitedStatesFederalEnergyRegulatoryCommissionMember2020-06-012020-06-010000764622pnw:OpenAccessTransmissionTariffMemberpnw:ArizonaPublicServiceCompanyMemberpnw:UnitedStatesFederalEnergyRegulatoryCommissionMember2021-06-012021-06-010000764622pnw:ArizonaPublicServiceCompanyMemberpnw:LostFixedCostRecoveryMechanismsMember2017-01-012017-12-310000764622pnw:ArizonaPublicServiceCompanyMemberpnw:LostFixedCostRecoveryMechanismsMember2021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberpnw:LostFixedCostRecoveryMechanismsMember2018-02-152018-02-150000764622pnw:ArizonaPublicServiceCompanyMemberpnw:LostFixedCostRecoveryMechanismsMember2019-02-152019-02-150000764622pnw:ArizonaPublicServiceCompanyMemberpnw:LostFixedCostRecoveryMechanismsMember2020-02-142020-02-140000764622pnw:ArizonaPublicServiceCompanyMemberpnw:LostFixedCostRecoveryMechanismsMember2021-02-152021-02-150000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2018-01-082018-01-080000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2018-08-132018-08-130000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2019-04-102019-04-100000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2019-10-292019-10-290000764622pnw:NetMeteringMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2017-09-012017-09-010000764622pnw:NetMeteringMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2019-05-012019-05-010000764622pnw:NetMeteringMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2020-05-012020-05-010000764622pnw:NetMeteringMembersrt:ScenarioForecastMemberpnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2021-10-012021-10-01pnw:program0000764622pnw:ArizonaCorporationCommissionMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-12-31utr:MWpnw:Customer00007646222019-11-1400007646222019-11-142019-11-1400007646222020-08-202020-08-2000007646222020-08-200000764622pnw:A2017SettlementAgreementAndItsCustomerEducationAndOutreachPlanMemberpnw:ArizonaPublicServiceCompanyMember2021-02-222021-02-220000764622pnw:FourCornersUnits4And5Memberpnw:ArizonaPublicServiceCompanyMemberpnw:SouthernCaliforniaEdisonCompanyMember2018-04-012018-04-300000764622pnw:FourCornersUnits4And5Memberpnw:ArizonaPublicServiceCompanyMemberpnw:SouthernCaliforniaEdisonCompanyMember2018-09-012018-09-300000764622us-gaap:SubsequentEventMemberpnw:FourCornersUnits4And5Memberpnw:ArizonaPublicServiceCompanyMemberpnw:SouthernCaliforniaEdisonCompanyMember2021-08-022021-08-020000764622pnw:FourCornersUnits4And5Memberpnw:ArizonaPublicServiceCompanyMemberpnw:SouthernCaliforniaEdisonCompanyMember2021-06-302021-06-300000764622pnw:FourCornersUnits4And5Memberpnw:ArizonaPublicServiceCompanyMemberpnw:SouthernCaliforniaEdisonCompanyMember2021-06-300000764622pnw:RetiredPowerPlantCostsMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberpnw:NavajoPlantMember2021-06-300000764622pnw:NavajoPlantCoalReclamationRegulatoryAssetMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:PensionMember2021-06-300000764622pnw:PensionMember2020-12-310000764622pnw:DeferredFuelandPurchasedPowerMember2021-06-300000764622pnw:DeferredFuelandPurchasedPowerMember2020-12-310000764622us-gaap:DeferredIncomeTaxChargesMember2021-06-300000764622us-gaap:DeferredIncomeTaxChargesMember2020-12-310000764622pnw:RetiredPowerPlantCostsMember2021-06-300000764622pnw:RetiredPowerPlantCostsMember2020-12-310000764622pnw:OctotilloDeferralMember2021-06-300000764622pnw:OctotilloDeferralMember2020-12-310000764622pnw:SCRDeferralMember2021-06-300000764622pnw:SCRDeferralMember2020-12-310000764622pnw:DeferredPropertyTaxesMember2021-06-300000764622pnw:DeferredPropertyTaxesMember2020-12-310000764622pnw:LostFixedCostRecoveryMember2021-06-300000764622pnw:LostFixedCostRecoveryMember2020-12-310000764622pnw:DeferredCompensationMember2021-06-300000764622pnw:DeferredCompensationMember2020-12-310000764622pnw:FourCornersCostDeferralMember2021-06-300000764622pnw:FourCornersCostDeferralMember2020-12-310000764622us-gaap:InvestmentCreditMember2021-06-300000764622us-gaap:InvestmentCreditMember2020-12-310000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2021-06-300000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310000764622pnw:CoalReclamationMember2021-06-300000764622pnw:CoalReclamationMember2020-12-310000764622us-gaap:LossOnReacquiredDebtMember2021-06-300000764622us-gaap:LossOnReacquiredDebtMember2020-12-310000764622pnw:MeadPhoenixtransmissionlineCIACMember2021-06-300000764622pnw:MeadPhoenixtransmissionlineCIACMember2020-12-310000764622pnw:TaxExpenseAdjustorMechanismMember2021-06-300000764622pnw:TaxExpenseAdjustorMechanismMember2020-12-310000764622pnw:DemandSideManagementMember2021-06-300000764622pnw:DemandSideManagementMember2020-12-310000764622pnw:TaxExpenseOfMedicareSubsidyMember2021-06-300000764622pnw:TaxExpenseOfMedicareSubsidyMember2020-12-310000764622pnw:TransmissionCostAdjustorMember2021-06-300000764622pnw:TransmissionCostAdjustorMember2020-12-310000764622pnw:DeferredFuelAndPurchasedPowerMTMCostsMember2021-06-300000764622pnw:DeferredFuelAndPurchasedPowerMTMCostsMember2020-12-310000764622pnw:PSAInterestMember2021-06-300000764622pnw:PSAInterestMember2020-12-310000764622us-gaap:OtherRegulatoryAssetsLiabilitiesMember2021-06-300000764622us-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-12-310000764622pnw:TaxCutsandJobsActof2017ExcessDeferredIncomeTaxesMemberpnw:ArizonaCorporationCommissionMember2021-06-300000764622pnw:TaxCutsandJobsActof2017ExcessDeferredIncomeTaxesMemberpnw:ArizonaCorporationCommissionMember2020-12-310000764622pnw:TaxCutsandJobsActof2017ExcessDeferredIncomeTaxesMemberpnw:UnitedStatesFederalEnergyRegulatoryCommissionMember2021-06-300000764622pnw:TaxCutsandJobsActof2017ExcessDeferredIncomeTaxesMemberpnw:UnitedStatesFederalEnergyRegulatoryCommissionMember2020-12-310000764622us-gaap:AssetRetirementObligationCostsMember2021-06-300000764622us-gaap:AssetRetirementObligationCostsMember2020-12-310000764622us-gaap:PostretirementBenefitCostsMember2021-06-300000764622us-gaap:PostretirementBenefitCostsMember2020-12-310000764622us-gaap:RemovalCostsMember2021-06-300000764622us-gaap:RemovalCostsMember2020-12-310000764622pnw:DeferredFuelAndPurchasedPowerMTMCostsMember2021-06-300000764622pnw:DeferredFuelAndPurchasedPowerMTMCostsMember2020-12-310000764622us-gaap:DeferredIncomeTaxChargesMember2021-06-300000764622us-gaap:DeferredIncomeTaxChargesMember2020-12-310000764622pnw:FourCornersCoalReclamationMember2021-06-300000764622pnw:FourCornersCoalReclamationMember2020-12-310000764622us-gaap:InvestmentCreditMember2021-06-300000764622us-gaap:InvestmentCreditMember2020-12-310000764622pnw:SpentNuclearFuelMember2021-06-300000764622pnw:SpentNuclearFuelMember2020-12-310000764622us-gaap:RenewableEnergyProgramMember2021-06-300000764622us-gaap:RenewableEnergyProgramMember2020-12-310000764622pnw:DeferredPropertyTaxesMember2021-06-300000764622pnw:DeferredPropertyTaxesMember2020-12-310000764622pnw:DemandSideManagementMember2021-06-300000764622pnw:DemandSideManagementMember2020-12-310000764622pnw:SundanceMaintenanceMember2021-06-300000764622pnw:SundanceMaintenanceMember2020-12-310000764622pnw:FERCTransmissionTrueUpMember2021-06-300000764622pnw:FERCTransmissionTrueUpMember2020-12-310000764622pnw:TransmissionCostAdjustorMember2021-06-300000764622pnw:TransmissionCostAdjustorMember2020-12-310000764622pnw:TaxExpenseAdjustorMechanismMember2021-06-300000764622pnw:TaxExpenseAdjustorMechanismMember2020-12-310000764622pnw:DeferredGainsonUtilityPropertyMember2021-06-300000764622pnw:DeferredGainsonUtilityPropertyMember2020-12-310000764622pnw:ActiveUnionMedicalTrustMember2021-06-300000764622pnw:ActiveUnionMedicalTrustMember2020-12-310000764622pnw:OtherRegulatoryLiabilitiesMember2021-06-300000764622pnw:OtherRegulatoryLiabilitiesMember2020-12-310000764622srt:ScenarioForecastMemberpnw:TaxExpenseAdjustorMechanismMember2021-12-310000764622us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-042021-01-040000764622us-gaap:PensionPlansDefinedBenefitMember2021-01-042021-01-040000764622us-gaap:PensionPlansDefinedBenefitMember2021-04-012021-06-300000764622us-gaap:PensionPlansDefinedBenefitMember2020-04-012020-06-300000764622us-gaap:PensionPlansDefinedBenefitMember2021-01-012021-06-300000764622us-gaap:PensionPlansDefinedBenefitMember2020-01-012020-06-300000764622us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-04-012021-06-300000764622us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-04-012020-06-300000764622us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-06-300000764622us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-06-300000764622us-gaap:PensionPlansDefinedBenefitMember2021-06-30pnw:Trust0000764622pnw:ArizonaPublicServiceCompanyMember1986-12-31pnw:Lease0000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMemberpnw:SaleLeasebackTransactionPeriodThrough2023Member2021-01-012021-06-300000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:SaleLeasebackTransactionPeriodThrough2033Memberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:SaleLeasebackTransactionPeriod2021Through2033Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:SaleLeasebackTransactionPeriod2021Through2033Memberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMembersrt:MaximumMember2021-01-012021-06-300000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMember2021-04-012021-06-300000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMember2020-04-012020-06-300000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-06-300000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberpnw:ArizonaPublicServiceCompanyMember2020-12-31utr:GWh0000764622us-gaap:CommodityContractMember2021-03-312021-03-310000764622us-gaap:CommodityContractMember2020-12-312020-12-31utr:Bcf0000764622us-gaap:CommodityContractMemberus-gaap:CostOfSalesMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-04-012021-06-300000764622us-gaap:CommodityContractMemberus-gaap:CostOfSalesMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-04-012020-06-300000764622us-gaap:CommodityContractMemberus-gaap:CostOfSalesMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-01-012021-06-300000764622us-gaap:CommodityContractMemberus-gaap:CostOfSalesMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-01-012020-06-300000764622us-gaap:CommodityContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-01-012020-06-300000764622us-gaap:CommodityContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-04-012021-06-300000764622us-gaap:CommodityContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-01-012021-06-300000764622us-gaap:CommodityContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-04-012020-06-300000764622us-gaap:CommodityContractMemberus-gaap:NondesignatedMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000764622us-gaap:CommodityContractMemberus-gaap:NondesignatedMemberus-gaap:CostOfSalesMember2020-04-012020-06-300000764622us-gaap:CommodityContractMemberus-gaap:NondesignatedMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000764622us-gaap:CommodityContractMemberus-gaap:NondesignatedMemberus-gaap:CostOfSalesMember2020-01-012020-06-300000764622us-gaap:CommodityContractMemberus-gaap:OtherAssetsMember2021-06-300000764622us-gaap:OtherInvestmentsMemberus-gaap:CommodityContractMember2021-06-300000764622us-gaap:CommodityContractMember2021-06-300000764622us-gaap:OtherLiabilitiesMemberus-gaap:CommodityContractMember2021-06-300000764622us-gaap:CommodityContractMemberpnw:DeferredCreditsMember2021-06-300000764622us-gaap:CommodityContractMemberus-gaap:OtherAssetsMember2020-12-310000764622us-gaap:OtherInvestmentsMemberus-gaap:CommodityContractMember2020-12-310000764622us-gaap:CommodityContractMember2020-12-310000764622us-gaap:OtherLiabilitiesMemberus-gaap:CommodityContractMember2020-12-310000764622us-gaap:CommodityContractMemberpnw:DeferredCreditsMember2020-12-310000764622pnw:RiskManagementAssetsMemberus-gaap:CreditConcentrationRiskMemberpnw:TwoCounterpartiesMember2021-06-302021-06-300000764622pnw:RiskManagementAssetsMemberus-gaap:CreditConcentrationRiskMember2021-06-30pnw:claim0000764622pnw:ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMemberpnw:ArizonaPublicServiceCompanyMember2011-07-012018-06-30pnw:time_period0000764622pnw:ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMember2011-07-012018-06-300000764622pnw:ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMemberpnw:ArizonaPublicServiceCompanyMember2020-11-022020-11-020000764622pnw:ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMember2019-10-312019-10-310000764622pnw:ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMemberpnw:ArizonaPublicServiceCompanyMember2019-10-312019-10-310000764622pnw:ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMember2021-03-152021-03-150000764622pnw:ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMemberpnw:ArizonaPublicServiceCompanyMember2021-03-152021-03-15pnw:power_plant0000764622us-gaap:PublicUtilitiesInventoryFuelMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberpnw:ContaminatedGroundwaterWellsMember2021-01-012021-06-30pnw:Defendant0000764622pnw:ArizonaPublicServiceCompanyMemberpnw:ContaminatedGroundwaterWellsMember2013-08-062013-08-06pnw:plaintiff0000764622pnw:ArizonaPublicServiceCompanyMemberpnw:ContaminatedGroundwaterWellsMember2016-12-162016-12-160000764622us-gaap:SettledLitigationMemberpnw:ArizonaPublicServiceCompanyMemberpnw:ContaminatedGroundwaterWellsMember2018-04-052018-04-050000764622pnw:ArizonaPublicServiceCompanyMemberpnw:ContaminatedGroundwaterWellsMember2018-04-052018-04-050000764622pnw:FourCornersUnits4And5Memberpnw:RegionalHazeRulesMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:NaturalGasTollingLetterOfCreditMemberpnw:FourCornersUnits4And5Memberpnw:RegionalHazeRulesMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:FourCornersUnits4And5Memberpnw:RegionalHazeRulesMemberpnw:ArizonaPublicServiceCompanyMemberpnw:FourCornersMember2021-01-012021-06-300000764622pnw:CoalCombustionWasteMemberpnw:ArizonaPublicServiceCompanyMemberpnw:FourCornersMember2021-01-012021-06-300000764622srt:MinimumMemberpnw:CoalCombustionWasteMemberpnw:ArizonaPublicServiceCompanyMemberpnw:ChollaMember2021-01-012021-06-300000764622pnw:CoalCombustionWasteMemberpnw:ArizonaPublicServiceCompanyMemberpnw:NavajoGeneratingStationMember2021-01-012021-06-300000764622pnw:ChollaandFourCornersMembersrt:MinimumMemberpnw:CoalCombustionWasteMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:ChollaandFourCornersMemberpnw:CoalCombustionWasteMemberpnw:ArizonaPublicServiceCompanyMembersrt:MaximumMember2021-01-012021-06-300000764622pnw:A4CAcquisitionLLCMemberpnw:FourCornersMember2016-07-062016-07-060000764622pnw:FourCornersMemberpnw:NavajoTransitionalEnergyCompanyLLCMember2016-07-062016-07-060000764622pnw:FourCornersMemberpnw:NavajoTransitionalEnergyCompanyLLCMember2018-07-032018-07-030000764622pnw:A4CAcquisitionLLCMemberpnw:FourCornersMember2021-06-300000764622pnw:FourCornersMemberpnw:CoalSupplyAgreementArbitrationMemberpnw:NavajoTransitionalEnergyCompanyLLCMember2016-07-062016-07-060000764622pnw:A4CAcquisitionLLCMemberpnw:FourCornersMemberpnw:CoalSupplyAgreementArbitrationMember2021-06-300000764622pnw:LettersofCreditExpiringin2020Memberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:SuretyBondsExpiringin2020Memberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:SCRDeferralMember2021-04-012021-06-300000764622pnw:SCRDeferralMember2020-04-012020-06-300000764622pnw:SCRDeferralMember2021-01-012021-06-300000764622pnw:SCRDeferralMember2020-01-012020-06-300000764622pnw:OctotilloDeferralMember2021-04-012021-06-300000764622pnw:OctotilloDeferralMember2020-04-012020-06-300000764622pnw:OctotilloDeferralMember2021-01-012021-06-300000764622pnw:OctotilloDeferralMember2020-01-012020-06-300000764622pnw:SCRDeferralMemberpnw:ArizonaPublicServiceCompanyMember2021-04-012021-06-300000764622pnw:SCRDeferralMemberpnw:ArizonaPublicServiceCompanyMember2020-04-012020-06-300000764622pnw:SCRDeferralMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:SCRDeferralMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-06-300000764622pnw:OctotilloDeferralMemberpnw:ArizonaPublicServiceCompanyMember2021-04-012021-06-300000764622pnw:OctotilloDeferralMemberpnw:ArizonaPublicServiceCompanyMember2020-04-012020-06-300000764622pnw:OctotilloDeferralMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:OctotilloDeferralMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-06-300000764622us-gaap:FairValueInputsLevel1Member2021-06-300000764622us-gaap:FairValueInputsLevel2Member2021-06-300000764622us-gaap:FairValueInputsLevel3Member2021-06-300000764622us-gaap:FairValueInputsLevel1Memberus-gaap:EquitySecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel2Memberus-gaap:EquitySecuritiesMember2021-06-300000764622us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000764622us-gaap:EquitySecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel1Memberpnw:USCommingledFundsMember2021-06-300000764622us-gaap:FairValueInputsLevel2Memberpnw:USCommingledFundsMember2021-06-300000764622us-gaap:FairValueInputsLevel3Memberpnw:USCommingledFundsMember2021-06-300000764622us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberpnw:USCommingledFundsMember2021-06-300000764622pnw:USCommingledFundsMember2021-06-300000764622us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasurySecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasurySecuritiesMember2021-06-300000764622us-gaap:USTreasurySecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel1Memberus-gaap:CorporateDebtSecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2021-06-300000764622us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000764622us-gaap:CorporateDebtSecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel1Memberus-gaap:MortgageBackedSecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2021-06-300000764622us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000764622us-gaap:MortgageBackedSecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-06-300000764622us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-06-300000764622us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000764622us-gaap:USStatesAndPoliticalSubdivisionsMember2021-06-300000764622us-gaap:FairValueInputsLevel1Memberus-gaap:OtherDebtSecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel2Memberus-gaap:OtherDebtSecuritiesMember2021-06-300000764622us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000764622us-gaap:OtherDebtSecuritiesMember2021-06-300000764622us-gaap:FairValueInputsLevel1Member2020-12-310000764622us-gaap:FairValueInputsLevel2Member2020-12-310000764622us-gaap:FairValueInputsLevel3Member2020-12-310000764622us-gaap:FairValueInputsLevel1Memberus-gaap:EquitySecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel2Memberus-gaap:EquitySecuritiesMember2020-12-310000764622us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000764622us-gaap:EquitySecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel1Memberpnw:USCommingledFundsMember2020-12-310000764622us-gaap:FairValueInputsLevel2Memberpnw:USCommingledFundsMember2020-12-310000764622us-gaap:FairValueInputsLevel3Memberpnw:USCommingledFundsMember2020-12-310000764622us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberpnw:USCommingledFundsMember2020-12-310000764622pnw:USCommingledFundsMember2020-12-310000764622us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasurySecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasurySecuritiesMember2020-12-310000764622us-gaap:USTreasurySecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel1Memberus-gaap:CorporateDebtSecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2020-12-310000764622us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000764622us-gaap:CorporateDebtSecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel1Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000764622us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000764622us-gaap:MortgageBackedSecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000764622us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000764622us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000764622us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000764622us-gaap:FairValueInputsLevel1Memberus-gaap:OtherDebtSecuritiesMember2020-12-310000764622us-gaap:FairValueInputsLevel2Memberus-gaap:OtherDebtSecuritiesMember2020-12-310000764622us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000764622us-gaap:OtherDebtSecuritiesMember2020-12-310000764622pnw:ArizonaPublicServiceCompanyMember2020-01-012020-12-310000764622pnw:ArizonaPublicServiceCompanyMember2019-01-012019-12-3100007646222021-01-042021-01-040000764622us-gaap:EquitySecuritiesMemberpnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:EquitySecuritiesMemberpnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2021-06-300000764622us-gaap:EquitySecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:EquitySecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622us-gaap:FixedIncomeSecuritiesMemberpnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:FixedIncomeSecuritiesMemberpnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2021-06-300000764622us-gaap:FixedIncomeSecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:FixedIncomeSecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:OtherReceivablesfromBrokerDealersandClearingMemberpnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:OtherReceivablesfromBrokerDealersandClearingMemberpnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2021-06-300000764622pnw:OtherReceivablesfromBrokerDealersandClearingMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:OtherReceivablesfromBrokerDealersandClearingMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2021-06-300000764622us-gaap:EquitySecuritiesMemberpnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622us-gaap:EquitySecuritiesMemberpnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2020-12-310000764622us-gaap:EquitySecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622us-gaap:EquitySecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-12-310000764622us-gaap:FixedIncomeSecuritiesMemberpnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622us-gaap:FixedIncomeSecuritiesMemberpnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2020-12-310000764622us-gaap:FixedIncomeSecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622us-gaap:FixedIncomeSecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-12-310000764622pnw:OtherReceivablesfromBrokerDealersandClearingMemberpnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622pnw:OtherReceivablesfromBrokerDealersandClearingMemberpnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2020-12-310000764622pnw:OtherReceivablesfromBrokerDealersandClearingMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622pnw:OtherReceivablesfromBrokerDealersandClearingMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-12-310000764622pnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622pnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2020-12-310000764622pnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2021-04-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2021-04-012021-06-300000764622pnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2020-04-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2020-04-012020-06-300000764622pnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2021-01-012021-06-300000764622pnw:NuclearDecommissioningTrustsMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberpnw:OtherSpecialUseFundsMember2020-01-012020-06-300000764622pnw:CoalReclamationEscrowAccountsMemberus-gaap:FixedIncomeSecuritiesMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:FixedIncomeSecuritiesMemberpnw:ActiveUnionMedicalTrustMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-03-310000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-03-310000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-04-012021-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-04-012021-06-300000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-06-300000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-03-310000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-03-310000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-04-012020-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-04-012020-06-300000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-06-300000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-12-310000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-01-012021-06-300000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2019-12-310000764622us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-01-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-03-310000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2021-03-310000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-04-012021-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2021-04-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-03-310000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2020-03-310000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-04-012020-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2020-04-012020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2020-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2020-12-310000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2021-01-012021-06-300000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2019-12-310000764622pnw:ArizonaPublicServiceCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-06-300000764622us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMemberpnw:ArizonaPublicServiceCompanyMember2020-01-012020-06-3000007646222017-01-012017-12-310000764622us-gaap:DomesticCountryMember2020-01-012020-03-310000764622us-gaap:DomesticCountryMember2020-01-012020-06-300000764622us-gaap:DomesticCountryMember2021-01-012021-06-300000764622pnw:PurchasedPowerLeaseContractsMember2021-04-012021-06-300000764622pnw:LandPropertyandEquipmentLeasesMember2021-04-012021-06-300000764622pnw:PurchasedPowerLeaseContractsMember2020-04-012020-06-300000764622pnw:LandPropertyandEquipmentLeasesMember2020-04-012020-06-300000764622pnw:PurchasedPowerLeaseContractsMember2021-01-012021-06-300000764622pnw:LandPropertyandEquipmentLeasesMember2021-01-012021-06-300000764622pnw:PurchasedPowerLeaseContractsMember2020-01-012020-06-300000764622pnw:LandPropertyandEquipmentLeasesMember2020-01-012020-06-300000764622pnw:PurchasedPowerLeaseContractsMember2021-06-300000764622pnw:LandPropertyandEquipmentLeasesMember2021-06-300000764622pnw:ChollaMember2021-01-012021-06-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

 

FORM 10-Q

 

(Mark One)

 

☒			QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 

For the quarterly period ended June 30, 2021

 

OR

 

 

Securities registered pursuant to Section 12(b) of the Act:

Title of each class			Trading Symbol(s)			Name of each exchange on which registered
Common Stock			PNW			The New York Stock Exchange

Indicate by check mark whether each registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

 

PINNACLE WEST CAPITAL CORPORATION

Yes

☒

No

☐

ARIZONA PUBLIC SERVICE COMPANY

Yes

☒

No

☐

 

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

PINNACLE WEST CAPITAL CORPORATION

Yes

☒

No

☐

ARIZONA PUBLIC SERVICE COMPANY

Yes

☒

No

☐

 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company.  See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether each registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

 

Arizona Public Service Company meets the conditions set forth in General Instruction H(1)(a) and (b) of Form 10-Q and is therefore filing this form with the reduced disclosure format allowed under that General Instruction.

TABLE OF CONTENTS

									Page
Forward-Looking Statements									2
Part I									4
Item 1.			Financial Statements						4
			Pinnacle West Capital Corporation						5
			Arizona Public Service Company						12
Item 2.			Management’s Discussion and Analysis of Financial Condition and Results of Operations						74
Item 3.			Quantitative and Qualitative Disclosures About Market Risk						100
Item 4.			Controls and Procedures						100
Part II									101
Item 1.			Legal Proceedings						101
Item 1A.			Risk Factors						101
Item 5.			Other Information						101
Item 6.			Exhibits						102
Signatures									105

 

This combined Form 10-Q is separately provided by Pinnacle West Capital Corporation (“Pinnacle West”) and Arizona Public Service Company (“APS”).  Any use of the words “Company,” “we,” and “our” refer to Pinnacle West.  Each registrant is providing on its own behalf all of the information contained in this Form 10-Q that relates to such registrant and, where required, its subsidiaries.  Except as stated in the preceding sentence, neither registrant is providing any information that does not relate to such registrant, and therefore makes no representation as to any such information.  The information required with respect to each company is set forth within the applicable items.  Item 1 of this report includes Condensed Consolidated Financial Statements of Pinnacle West and Condensed Consolidated Financial Statements of APS.  Item 1 also includes Combined Notes to Condensed Consolidated Financial Statements.

FORWARD-LOOKING STATEMENTS

    This document contains forward-looking statements based on current expectations.  These forward-looking statements are often identified by words such as “estimate,” “predict,” “may,” “believe,” “plan,” “expect,” “require,” “intend,” “assume,” “project,” “anticipate,” “goal,” “seek,” “strategy,” “likely,” “should,” “will,” “could,” and similar words.  Because actual results may differ materially from expectations, we caution readers not to place undue reliance on these statements.  A number of factors could cause future results to differ materially from historical results, or from outcomes currently expected or sought by Pinnacle West or APS.  In addition to the Risk Factors described in Part I, Item 1A of the Pinnacle West/APS Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (“2020 Form 10-K”), Part II, Item 1A of this report and in Part I, Item 2 — “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of this report, these factors include, but are not limited to:

•the potential effects of the continued Coronavirus (“COVID-19”) pandemic, including, but not limited to, demand for energy, economic growth, our employees and contractors, supply chain, expenses, capital markets, capital projects, operations and maintenance activities, uncollectable accounts, liquidity, cash flows or other unpredictable events;

•our ability to manage capital expenditures and operations and maintenance costs while maintaining reliability and customer service levels;

•variations in demand for electricity, including those due to weather, seasonality, the general economy or social conditions, customer and sales growth (or decline), the effects of energy conservation measures and distributed generation, and technological advancements;

•power plant and transmission system performance and outages;

•competition in retail and wholesale power markets;

•regulatory and judicial decisions, developments and proceedings;

•new legislation, ballot initiatives and regulation, including those relating to environmental requirements, regulatory and energy policy, nuclear plant operations and potential deregulation of retail electric markets;

•fuel and water supply availability;

•our ability to achieve timely and adequate rate recovery of our costs through our rates and adjustor recovery mechanisms, including returns on and of debt and equity capital investment;

•our ability to meet renewable energy and energy efficiency mandates and recover related costs;

•the ability of APS to achieve its clean energy goals (including a goal by 2050 of 100% clean, carbon-free electricity) and, if these goals are achieved, the impact of such achievement on APS, its customers, and its business, financial condition and results of operations;

•risks inherent in the operation of nuclear facilities, including spent fuel disposal uncertainty;

•current and future economic conditions in Arizona, including in real estate markets;

•the direct or indirect effect on our facilities or business from cybersecurity threats or intrusions, data security breaches, terrorist attack, physical attack, severe storms, droughts, or other catastrophic events, such as fires, explosions, pandemic health events, or similar occurrences;

•the development of new technologies which may affect electric sales or delivery;

•the cost of debt and equity capital and the ability to access capital markets when required;

•environmental, economic and other concerns surrounding coal-fired generation, including regulation of greenhouse gas emissions;

•volatile fuel and purchased power costs;

•the investment performance of the assets of our nuclear decommissioning trust, pension, and other postretirement benefit plans and the resulting impact on future funding requirements;

•the liquidity of wholesale power markets and the use of derivative contracts in our business;

•potential shortfalls in insurance coverage;

•new accounting requirements or new interpretations of existing requirements;

•generation, transmission and distribution facility and system conditions and operating costs;

•the ability to meet the anticipated future need for additional generation and associated transmission facilities in our region;

•the willingness or ability of our counterparties, power plant participants and power plant landowners to meet contractual or other obligations or extend the rights for continued power plant operations; and

•restrictions on dividends or other provisions in our credit agreements and Arizona Corporation Commission (“ACC”) orders. 

These and other factors are discussed in the Risk Factors described in Part I, Item 1A of our 2020 Form 10-K, Part II, Item 1A of this report, and in Part I, Item 2 — “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of this report, which readers should review carefully before placing any reliance on our financial statements or disclosures.  Neither Pinnacle West nor APS assumes any obligation to update these statements, even if our internal estimates change, except as required by law.