0000783325--12-312023FYfalse336.006.00http://fasb.org/us-gaap/2023#OtherAssetsNoncurrenthttp://fasb.org/us-gaap/2023#OtherAssetsNoncurrenthttp://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentNethttp://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentNethttp://fasb.org/us-gaap/2023#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2023#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrenthttp://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrenthttp://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligationsCurrenthttp://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligationsCurrenthttp://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligationshttp://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligationshttp://fasb.org/us-gaap/2023#OtherAssetsCurrenthttp://fasb.org/us-gaap/2023#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2023#OtherAssetsCurrenthttp://fasb.org/us-gaap/2023#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrenthttp://fasb.org/us-gaap/2023#OtherLiabilitiesNoncurrenthttp://fasb.org/us-gaap/2023#OtherAssetsNoncurrenthttp://fasb.org/us-gaap/2023#OtherAssetsNoncurrenthttp://fasb.org/us-gaap/2023#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2023#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2023#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2023#Revenueshttp://fasb.org/us-gaap/2023#Revenueshttp://fasb.org/us-gaap/2023#Revenues0.330.150.600.150.250.50http://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpensehttp://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpensehttp://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpense00007833252023-01-012023-12-3100007833252023-06-30iso4217:USD00007833252024-01-31xbrli:shares00007833252022-01-012022-12-3100007833252021-01-012021-12-31iso4217:USDxbrli:shares00007833252023-12-3100007833252022-12-310000783325us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2023-12-310000783325us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2022-12-310000783325wec:SapphireSkyWindEnergyLLCMember2023-01-012023-12-310000783325wec:SamsonIMember2023-01-012023-12-310000783325wec:ThunderheadWindEnergyLLCMember2022-01-012022-12-3100007833252021-12-3100007833252020-12-310000783325us-gaap:CommonStockMember2020-12-310000783325us-gaap:AdditionalPaidInCapitalMember2020-12-310000783325us-gaap:RetainedEarningsMember2020-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000783325us-gaap:ParentMember2020-12-310000783325us-gaap:PreferredStockMember2020-12-310000783325us-gaap:NoncontrollingInterestMember2020-12-310000783325us-gaap:CommonStockMember2021-01-012021-12-310000783325us-gaap:AdditionalPaidInCapitalMember2021-01-012021-12-310000783325us-gaap:RetainedEarningsMember2021-01-012021-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-12-310000783325us-gaap:ParentMember2021-01-012021-12-310000783325us-gaap:PreferredStockMember2021-01-012021-12-310000783325us-gaap:NoncontrollingInterestMember2021-01-012021-12-310000783325us-gaap:CommonStockMember2021-12-310000783325us-gaap:AdditionalPaidInCapitalMember2021-12-310000783325us-gaap:RetainedEarningsMember2021-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000783325us-gaap:ParentMember2021-12-310000783325us-gaap:PreferredStockMember2021-12-310000783325us-gaap:NoncontrollingInterestMember2021-12-310000783325us-gaap:CommonStockMember2022-01-012022-12-310000783325us-gaap:AdditionalPaidInCapitalMember2022-01-012022-12-310000783325us-gaap:RetainedEarningsMember2022-01-012022-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-12-310000783325us-gaap:ParentMember2022-01-012022-12-310000783325us-gaap:PreferredStockMember2022-01-012022-12-310000783325us-gaap:NoncontrollingInterestMember2022-01-012022-12-310000783325us-gaap:CommonStockMember2022-12-310000783325us-gaap:AdditionalPaidInCapitalMember2022-12-310000783325us-gaap:RetainedEarningsMember2022-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-310000783325us-gaap:ParentMember2022-12-310000783325us-gaap:PreferredStockMember2022-12-310000783325us-gaap:NoncontrollingInterestMember2022-12-310000783325us-gaap:CommonStockMember2023-01-012023-12-310000783325us-gaap:AdditionalPaidInCapitalMember2023-01-012023-12-310000783325us-gaap:RetainedEarningsMember2023-01-012023-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-12-310000783325us-gaap:ParentMember2023-01-012023-12-310000783325us-gaap:PreferredStockMember2023-01-012023-12-310000783325us-gaap:NoncontrollingInterestMember2023-01-012023-12-310000783325us-gaap:CommonStockMember2023-12-310000783325us-gaap:AdditionalPaidInCapitalMember2023-12-310000783325us-gaap:RetainedEarningsMember2023-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-12-310000783325us-gaap:ParentMember2023-12-310000783325us-gaap:PreferredStockMember2023-12-310000783325us-gaap:NoncontrollingInterestMember2023-12-310000783325wec:ElectricOperationsMember2023-12-31wec:customer0000783325wec:NaturalGasOperationsMember2023-12-310000783325wec:ATCMember2023-12-31xbrli:pure0000783325wec:ATCHoldcoLLCMember2023-12-310000783325wec:TotalRetailCustomersMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-12-31wec:performance_obligations0000783325wec:WholesalecustomerMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-12-31wec:contract0000783325us-gaap:ElectricityUsRegulatedMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMember2023-01-012023-12-310000783325wec:MERCApplianceServiceRevenueMembersrt:MaximumMember2023-12-310000783325wec:OthernonutilityrevenuesMember2023-01-012023-12-310000783325wec:WePowerrevenuesMember2023-01-012023-12-310000783325wec:WePowerrevenuesMember2022-01-012022-12-310000783325wec:WePowerrevenuesMember2021-01-012021-12-31iso4217:USDutr:MMBTU0000783325wec:WisconsinElectricPowerCompanyMember2023-01-012023-12-310000783325wec:WisconsinElectricPowerCompanyMember2022-01-012022-12-310000783325wec:WisconsinElectricPowerCompanyMember2021-01-012021-12-310000783325wec:WisconsinPublicServiceCorporationMember2023-01-012023-12-310000783325wec:WisconsinPublicServiceCorporationMember2022-01-012022-12-310000783325wec:WisconsinPublicServiceCorporationMember2021-01-012021-12-310000783325wec:WisconsinGasLLCMember2023-01-012023-12-310000783325wec:WisconsinGasLLCMember2022-01-012022-12-310000783325wec:WisconsinGasLLCMember2021-01-012021-12-310000783325wec:ThePeoplesGasLightAndCokeCompanyMember2023-01-012023-12-310000783325wec:ThePeoplesGasLightAndCokeCompanyMember2022-01-012022-12-310000783325wec:ThePeoplesGasLightAndCokeCompanyMember2021-01-012021-12-310000783325wec:NorthShoreGasCompanyMember2023-01-012023-12-310000783325wec:NorthShoreGasCompanyMember2022-01-012022-12-310000783325wec:NorthShoreGasCompanyMember2021-01-012021-12-310000783325wec:MinnesotaEnergyResourcesCorporationMember2023-01-012023-12-310000783325wec:MinnesotaEnergyResourcesCorporationMember2022-01-012022-12-310000783325wec:MinnesotaEnergyResourcesCorporationMember2021-01-012021-12-310000783325wec:MGUMember2023-01-012023-12-310000783325wec:MGUMember2022-01-012022-12-310000783325wec:MGUMember2021-01-012021-12-310000783325wec:UpperMichiganEnergyResourcesCorporationMember2023-01-012023-12-310000783325wec:UpperMichiganEnergyResourcesCorporationMember2022-01-012022-12-310000783325wec:UpperMichiganEnergyResourcesCorporationMember2021-01-012021-12-310000783325srt:MinimumMemberwec:PWGSMember2023-12-310000783325srt:MaximumMemberwec:PWGSMember2023-12-310000783325wec:ERGSMembersrt:MinimumMember2023-12-310000783325wec:ERGSMembersrt:MaximumMember2023-12-310000783325us-gaap:ElectricGenerationEquipmentMembersrt:MaximumMember2023-12-310000783325us-gaap:ElectricGenerationTransmissionAndDistributionEquipmentMembersrt:MaximumMember2023-12-310000783325srt:MinimumMemberus-gaap:SoftwareAndSoftwareDevelopmentCostsMember2023-12-310000783325srt:MaximumMemberus-gaap:SoftwareAndSoftwareDevelopmentCostsMember2023-12-310000783325wec:RetailOperationsMemberwec:WisconsinPublicServiceCorporationMember2023-01-012023-12-310000783325wec:RetailOperationsMemberwec:WisconsinElectricPowerCompanyMember2023-01-012023-12-310000783325wec:RetailOperationsMemberwec:WisconsinGasMember2023-01-012023-12-310000783325wec:RetailOperationsMemberwec:WBSMember2023-01-012023-12-310000783325wec:RetailOperationsMemberwec:UpperMichiganEnergyResourcesCorporationMember2023-01-012023-12-310000783325wec:WholesaleOperationsMemberwec:WisconsinElectricPowerCompanyMember2023-01-012023-12-310000783325wec:WholesaleOperationsMemberwec:WisconsinPublicServiceCorporationMember2023-01-012023-12-310000783325wec:WisconsinGasMember2023-01-012023-12-310000783325wec:WisconsinGasMember2022-01-012022-12-310000783325wec:WisconsinGasMember2021-01-012021-12-310000783325wec:WBSMember2023-01-012023-12-310000783325wec:WBSMember2022-01-012022-12-310000783325wec:WBSMember2021-01-012021-12-310000783325wec:OthersubsidiariesMember2023-01-012023-12-310000783325wec:OthersubsidiariesMember2022-01-012022-12-310000783325wec:OthersubsidiariesMember2021-01-012021-12-3100007833252021-05-060000783325us-gaap:EmployeeStockOptionMember2023-01-012023-12-310000783325us-gaap:EmployeeStockOptionMember2023-12-310000783325us-gaap:EmployeeStockOptionMember2022-01-012022-12-310000783325us-gaap:EmployeeStockOptionMember2021-01-012021-12-310000783325us-gaap:RestrictedStockMembersrt:ManagementMember2023-01-012023-12-310000783325us-gaap:RestrictedStockMembersrt:DirectorMember2023-01-012023-12-310000783325us-gaap:PerformanceSharesMember2023-01-012023-12-310000783325wec:PerformanceUnitsGrantedPriorTo2023Membersrt:MinimumMemberus-gaap:PerformanceSharesMember2023-01-012023-12-310000783325wec:PerformanceUnitsGrantedPriorTo2023Memberus-gaap:PerformanceSharesMembersrt:MaximumMember2023-01-012023-12-310000783325wec:PerformanceUnitsGrantedPriorTo2023Memberus-gaap:PerformanceSharesMember2023-01-012023-12-310000783325wec:PerformanceUnitsGrantedAfterJanuary12023Memberus-gaap:PerformanceSharesMember2023-01-012023-12-310000783325wec:PerformanceUnitsGrantedAfterJanuary12023Memberus-gaap:PerformanceSharesMembersrt:MaximumMember2023-01-012023-12-310000783325us-gaap:EmployeeStockOptionMember2023-01-012023-12-310000783325us-gaap:EmployeeStockOptionMember2022-01-012022-12-310000783325us-gaap:EmployeeStockOptionMember2021-01-012021-12-310000783325us-gaap:CustomerConcentrationRiskMember2023-01-012023-12-310000783325us-gaap:CustomerConcentrationRiskMemberus-gaap:SalesRevenueNetMemberus-gaap:FairValueConcentrationOfRiskAllFinancialInstrumentsMember2023-01-012023-12-310000783325wec:WestRiversideEnergyCenterMemberwec:WisconsinElectricPowerCompanyMember2023-06-30utr:MW0000783325wec:WestRiversideEnergyCenterMemberwec:WisconsinElectricPowerCompanyMember2023-06-012023-06-300000783325wec:WestRiversideEnergyCenterMemberwec:WisconsinElectricPowerCompanyMember2023-09-300000783325wec:WestRiversideEnergyCenterMemberwec:WisconsinElectricPowerCompanyMember2023-09-012023-09-300000783325wec:WPSMemberwec:RedBarnWindParkMember2023-04-300000783325wec:WPSMemberwec:RedBarnWindParkMember2023-04-012023-04-300000783325wec:WisconsinElectricPowerCompanyAndWisconsinPublicServiceCorporationMemberwec:WhitewaterCogenerationFacilityMember2023-01-310000783325wec:WisconsinElectricPowerCompanyAndWisconsinPublicServiceCorporationMemberwec:WhitewaterCogenerationFacilityMember2023-01-012023-01-310000783325wec:SamsonIMemberwec:WECInfrastructureLLCMember2023-02-280000783325wec:SamsonIMemberwec:WECInfrastructureLLCMember2023-02-012023-02-280000783325wec:SamsonIMemberwec:WECInfrastructureLLCMemberus-gaap:SubsequentEventMember2024-01-310000783325wec:SamsonIMemberwec:WECInfrastructureLLCMember2023-01-012023-12-310000783325wec:WECInfrastructureLLCMemberwec:SapphireSkyWindEnergyLLCMember2023-02-280000783325wec:WECInfrastructureLLCMemberwec:SapphireSkyWindEnergyLLCMember2023-02-012023-02-280000783325wec:WECInfrastructureLLCMemberwec:SapphireSkyWindEnergyLLCMember2023-01-012023-12-310000783325wec:WECInfrastructureLLCMemberwec:MapleFlatsMember2022-10-310000783325wec:WECInfrastructureLLCMemberwec:MapleFlatsMember2022-10-012022-10-310000783325wec:WECInfrastructureLLCMemberwec:ThunderheadWindEnergyLLCMember2022-09-300000783325wec:WECInfrastructureLLCMemberwec:ThunderheadWindEnergyLLCMember2022-09-012022-09-300000783325wec:WECInfrastructureLLCMemberwec:ThunderheadWindEnergyLLCMember2023-01-012023-12-310000783325wec:WECInfrastructureLLCMemberwec:JayhawkWindLLCMember2021-02-280000783325wec:WECInfrastructureLLCMemberwec:JayhawkWindLLCMember2021-02-012021-02-280000783325wec:WECInfrastructureLLCMemberwec:JayhawkWindLLCMember2022-12-310000783325wec:WECInfrastructureLLCMemberwec:JayhawkWindLLCMember2023-01-012023-12-310000783325wec:WisconsinElectricPowerCompanyMember2023-06-012023-06-30utr:acre0000783325wec:ThePeoplesGasLightAndCokeCompanyMember2022-05-012022-05-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMembersrt:ConsolidationEliminationsMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMembersrt:ConsolidationEliminationsMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:PublicUtilitiesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:PublicUtilitiesMembersrt:ConsolidationEliminationsMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:PublicUtilitiesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:OthernonutilityrevenuesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OthernonutilityrevenuesMembersrt:ConsolidationEliminationsMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OthernonutilityrevenuesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMembersrt:ConsolidationEliminationsMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:WisconsinMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberwec:OtheroperatingrevenuesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:PublicUtilityMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:NonUtilityEnergyInfrastructureMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310000783325wec:OtheroperatingrevenuesMembersrt:ConsolidationEliminationsMember2023-01-012023-12-310000783325wec:OtheroperatingrevenuesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:WisconsinMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:PublicUtilityMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310000783325srt:ConsolidationEliminationsMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:ElectricityUsRegulatedMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMembersrt:ConsolidationEliminationsMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMembersrt:ConsolidationEliminationsMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:PublicUtilitiesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:PublicUtilitiesMembersrt:ConsolidationEliminationsMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:PublicUtilitiesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:OthernonutilityrevenuesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OthernonutilityrevenuesMembersrt:ConsolidationEliminationsMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OthernonutilityrevenuesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMembersrt:ConsolidationEliminationsMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:WisconsinMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberwec:OtheroperatingrevenuesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:PublicUtilityMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:NonUtilityEnergyInfrastructureMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310000783325wec:OtheroperatingrevenuesMembersrt:ConsolidationEliminationsMember2022-01-012022-12-310000783325wec:OtheroperatingrevenuesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:WisconsinMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:PublicUtilityMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310000783325srt:ConsolidationEliminationsMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:ElectricityUsRegulatedMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:CorporateAndOtherMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMembersrt:ConsolidationEliminationsMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMembersrt:ConsolidationEliminationsMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:PublicUtilitiesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberus-gaap:CorporateAndOtherMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:PublicUtilitiesMembersrt:ConsolidationEliminationsMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:PublicUtilitiesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:OthernonutilityrevenuesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:OthernonutilityrevenuesMemberus-gaap:CorporateAndOtherMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OthernonutilityrevenuesMembersrt:ConsolidationEliminationsMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OthernonutilityrevenuesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMembersrt:ConsolidationEliminationsMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:WisconsinMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberwec:OtheroperatingrevenuesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:PublicUtilityMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberwec:NonUtilityEnergyInfrastructureMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtheroperatingrevenuesMemberus-gaap:CorporateAndOtherMember2021-01-012021-12-310000783325wec:OtheroperatingrevenuesMembersrt:ConsolidationEliminationsMember2021-01-012021-12-310000783325wec:OtheroperatingrevenuesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:WisconsinMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:PublicUtilityMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2021-01-012021-12-310000783325srt:ConsolidationEliminationsMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:SmallcommercialandindustrialMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:SmallcommercialandindustrialMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:SmallcommercialandindustrialMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:LargecommercialandindustrialcustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:LargecommercialandindustrialcustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:LargecommercialandindustrialcustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OtherretailcustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OtherretailcustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OtherretailcustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:WholesalecustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:WholesalecustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:WholesalecustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:ResaleCustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:ResaleCustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:ResaleCustomersMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberwec:DowntownMilwaukeeSteamCustomersMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberwec:DowntownMilwaukeeSteamCustomersMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberwec:DowntownMilwaukeeSteamCustomersMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMemberwec:TransportationcustomersMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMemberwec:TransportationcustomersMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:ResidentialcustomerMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TotalRetailCustomersMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMemberwec:TransportationcustomersMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:TransportationcustomersMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:WisconsinMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:NaturalGasUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:AlternativeEnergyMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:AlternativeEnergyMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:AlternativeEnergyMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:WePowerrevenuesMemberwec:OthernonutilityrevenuesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:WePowerrevenuesMemberwec:OthernonutilityrevenuesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:WePowerrevenuesMemberwec:OthernonutilityrevenuesMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMembernaics:ZZ811412wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMembernaics:ZZ811412wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMembernaics:ZZ811412wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMember2021-01-012021-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OtherMemberwec:OthernonutilityrevenuesMember2023-01-012023-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OtherMemberwec:OthernonutilityrevenuesMember2022-01-012022-12-310000783325us-gaap:RevenueFromContractWithCustomerMemberwec:OtherMemberwec:OthernonutilityrevenuesMember2021-01-012021-12-310000783325wec:OtheroperatingrevenuesMemberwec:LatepaymentchargesMember2023-01-012023-12-310000783325wec:OtheroperatingrevenuesMemberwec:LatepaymentchargesMember2022-01-012022-12-310000783325wec:OtheroperatingrevenuesMemberwec:LatepaymentchargesMember2021-01-012021-12-310000783325wec:OtheroperatingrevenuesMemberwec:AlternativerevenuesutilityMember2023-01-012023-12-310000783325wec:OtheroperatingrevenuesMemberwec:AlternativerevenuesutilityMember2022-01-012022-12-310000783325wec:OtheroperatingrevenuesMemberwec:AlternativerevenuesutilityMember2021-01-012021-12-310000783325wec:OtheroperatingrevenuesMemberwec:LeasesMember2023-01-012023-12-310000783325wec:OtheroperatingrevenuesMemberwec:LeasesMember2022-01-012022-12-310000783325wec:OtheroperatingrevenuesMemberwec:LeasesMember2021-01-012021-12-310000783325wec:WisconsinMemberus-gaap:PublicUtilitiesMember2023-12-310000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2023-12-310000783325us-gaap:PublicUtilitiesMemberwec:OtherStatesMember2023-12-310000783325us-gaap:PublicUtilitiesMember2023-12-310000783325wec:NonUtilityEnergyInfrastructureMember2023-12-310000783325us-gaap:CorporateAndOtherMember2023-12-310000783325wec:WisconsinMemberus-gaap:PublicUtilitiesMember2022-12-310000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2022-12-310000783325us-gaap:PublicUtilitiesMemberwec:OtherStatesMember2022-12-310000783325us-gaap:PublicUtilitiesMember2022-12-310000783325wec:NonUtilityEnergyInfrastructureMember2022-12-310000783325us-gaap:CorporateAndOtherMember2022-12-310000783325wec:WisconsinMemberus-gaap:PublicUtilitiesMember2023-01-012023-12-310000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2023-01-012023-12-310000783325us-gaap:PublicUtilitiesMemberwec:OtherStatesMember2023-01-012023-12-310000783325wec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2023-01-012023-12-310000783325wec:IllinoisMemberwec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMember2023-01-012023-12-310000783325wec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2023-01-012023-12-310000783325wec:UncollectibleExpenseMember2023-01-012023-12-310000783325wec:WisconsinMemberus-gaap:PublicUtilitiesMember2021-12-310000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2021-12-310000783325us-gaap:PublicUtilitiesMemberwec:OtherStatesMember2021-12-310000783325wec:WisconsinMemberus-gaap:PublicUtilitiesMember2022-01-012022-12-310000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2022-01-012022-12-310000783325us-gaap:PublicUtilitiesMemberwec:OtherStatesMember2022-01-012022-12-310000783325wec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2022-01-012022-12-310000783325wec:IllinoisMemberwec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMember2022-01-012022-12-310000783325wec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2022-01-012022-12-310000783325wec:UncollectibleExpenseMember2022-01-012022-12-310000783325wec:WisconsinMemberus-gaap:PublicUtilitiesMember2020-12-310000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2020-12-310000783325us-gaap:PublicUtilitiesMemberwec:OtherStatesMember2020-12-310000783325wec:WisconsinMemberus-gaap:PublicUtilitiesMember2021-01-012021-12-310000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2021-01-012021-12-310000783325us-gaap:PublicUtilitiesMemberwec:OtherStatesMember2021-01-012021-12-310000783325wec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2021-01-012021-12-310000783325wec:IllinoisMemberwec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMember2021-01-012021-12-310000783325wec:UncollectibleExpenseMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2021-01-012021-12-310000783325wec:UncollectibleExpenseMember2021-01-012021-12-310000783325us-gaap:PensionAndOtherPostretirementPlansCostsMember2023-12-310000783325us-gaap:PensionAndOtherPostretirementPlansCostsMember2022-12-310000783325us-gaap:StrandedCostsMember2023-12-310000783325us-gaap:StrandedCostsMember2022-12-310000783325us-gaap:EnvironmentalRestorationCostsMember2023-12-310000783325us-gaap:EnvironmentalRestorationCostsMember2022-12-310000783325us-gaap:DeferredIncomeTaxChargesMember2023-12-310000783325us-gaap:DeferredIncomeTaxChargesMember2022-12-310000783325us-gaap:AssetRetirementObligationCostsMember2023-12-310000783325us-gaap:AssetRetirementObligationCostsMember2022-12-310000783325us-gaap:DeferredDerivativeGainLossMember2023-12-310000783325us-gaap:DeferredDerivativeGainLossMember2022-12-310000783325wec:UncollectibleExpenseMember2023-12-310000783325wec:UncollectibleExpenseMember2022-12-310000783325wec:SystemSupportResourceMember2023-12-310000783325wec:SystemSupportResourceMember2022-12-310000783325wec:SecuritizationCostsMember2023-12-310000783325wec:SecuritizationCostsMember2022-12-310000783325wec:BluewaterStorageCostsMember2023-12-310000783325wec:BluewaterStorageCostsMember2022-12-310000783325wec:EnergyEfficiencyProgramsMember2023-12-310000783325wec:EnergyEfficiencyProgramsMember2022-12-310000783325wec:EnergyCostsRecoverableThroughRateAdjustmentsMember2023-12-310000783325wec:EnergyCostsRecoverableThroughRateAdjustmentsMember2022-12-310000783325us-gaap:AssetRecoverableGasCostsMember2023-12-310000783325us-gaap:AssetRecoverableGasCostsMember2022-12-310000783325us-gaap:OtherRegulatoryAssetsLiabilitiesMember2023-12-310000783325us-gaap:OtherRegulatoryAssetsLiabilitiesMember2022-12-310000783325us-gaap:EnvironmentalRestorationCostsMember2023-01-012023-12-310000783325wec:SystemSupportResourceMember2020-01-010000783325us-gaap:AssetRecoverableGasCostsMember2021-09-300000783325us-gaap:DeferredIncomeTaxChargesMember2023-12-310000783325us-gaap:DeferredIncomeTaxChargesMember2022-12-310000783325us-gaap:RemovalCostsMember2023-12-310000783325us-gaap:RemovalCostsMember2022-12-310000783325us-gaap:PensionAndOtherPostretirementPlansCostsMember2023-12-310000783325us-gaap:PensionAndOtherPostretirementPlansCostsMember2022-12-310000783325wec:EnergyCostsRefundableThroughRateAdjustmentsMember2023-12-310000783325wec:EnergyCostsRefundableThroughRateAdjustmentsMember2022-12-310000783325wec:ElectricTransmissionCostsMember2023-12-310000783325wec:ElectricTransmissionCostsMember2022-12-310000783325wec:UncollectibleExpenseMember2023-12-310000783325wec:UncollectibleExpenseMember2022-12-310000783325us-gaap:DeferredDerivativeGainLossMember2023-12-310000783325us-gaap:DeferredDerivativeGainLossMember2022-12-310000783325wec:EnergyEfficiencyProgramsMember2023-12-310000783325wec:EnergyEfficiencyProgramsMember2022-12-310000783325wec:DecouplingMember2023-12-310000783325wec:DecouplingMember2022-12-310000783325us-gaap:OtherRegulatoryAssetsLiabilitiesMember2023-12-310000783325us-gaap:OtherRegulatoryAssetsLiabilitiesMember2022-12-310000783325wec:PleasantPrairiePowerPlantMember2023-12-310000783325wec:PleasantPrairiePowerPlantMemberwec:SecuritizationCostsMember2021-05-310000783325wec:PresqueIslePowerPlantPIPPMember2023-12-310000783325wec:PulliamPowerPlantMember2023-12-310000783325wec:EdgewaterUnit4Member2023-12-310000783325us-gaap:ElectricGenerationEquipmentMemberus-gaap:RegulatedOperationMember2023-12-310000783325us-gaap:ElectricGenerationEquipmentMemberus-gaap:RegulatedOperationMember2022-12-310000783325us-gaap:ElectricDistributionMemberus-gaap:RegulatedOperationMember2023-12-310000783325us-gaap:ElectricDistributionMemberus-gaap:RegulatedOperationMember2022-12-310000783325wec:NaturalGasStorageTransportationandDistributionMemberus-gaap:RegulatedOperationMember2023-12-310000783325wec:NaturalGasStorageTransportationandDistributionMemberus-gaap:RegulatedOperationMember2022-12-310000783325wec:PropertyplantandequipmenttobeabandonedMemberus-gaap:RegulatedOperationMember2023-12-310000783325wec:PropertyplantandequipmenttobeabandonedMemberus-gaap:RegulatedOperationMember2022-12-310000783325us-gaap:PropertyPlantAndEquipmentOtherTypesMemberus-gaap:RegulatedOperationMember2023-12-310000783325us-gaap:PropertyPlantAndEquipmentOtherTypesMemberus-gaap:RegulatedOperationMember2022-12-310000783325us-gaap:RegulatedOperationMember2023-12-310000783325us-gaap:RegulatedOperationMember2022-12-310000783325us-gaap:UnregulatedOperationMemberwec:WePowerGeneratingFacilitiesMember2023-12-310000783325us-gaap:UnregulatedOperationMemberwec:WePowerGeneratingFacilitiesMember2022-12-310000783325wec:RenewableGenerationMemberus-gaap:UnregulatedOperationMember2023-12-310000783325wec:RenewableGenerationMemberus-gaap:UnregulatedOperationMember2022-12-310000783325wec:NaturalGasStorageEquipmentMemberus-gaap:UnregulatedOperationMember2023-12-310000783325wec:NaturalGasStorageEquipmentMemberus-gaap:UnregulatedOperationMember2022-12-310000783325us-gaap:UnregulatedOperationMemberwec:NonUtilityEnergyInfrastructureMember2023-12-310000783325us-gaap:UnregulatedOperationMemberwec:NonUtilityEnergyInfrastructureMember2022-12-310000783325wec:CorporateServicesEquipmentMemberus-gaap:UnregulatedOperationMember2023-12-310000783325wec:CorporateServicesEquipmentMemberus-gaap:UnregulatedOperationMember2022-12-310000783325us-gaap:UnregulatedOperationMemberus-gaap:PropertyPlantAndEquipmentOtherTypesMember2023-12-310000783325us-gaap:UnregulatedOperationMemberus-gaap:PropertyPlantAndEquipmentOtherTypesMember2022-12-310000783325us-gaap:UnregulatedOperationMember2023-12-310000783325us-gaap:UnregulatedOperationMember2022-12-310000783325wec:OCPPGeneratingUnits58Memberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325wec:ColumbiaEnergyCenterUnits1And2Memberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:ThePeoplesGasLightAndCokeCompanyMember2023-11-012023-11-300000783325wec:NorthShoreGasCompanyMember2023-11-012023-11-300000783325wec:PGLAndNSGMember2023-11-012023-11-300000783325us-gaap:ElectricGenerationEquipmentMemberwec:SamsonISolarEnergyCenterLLCMember2023-01-012023-12-310000783325us-gaap:ElectricGenerationEquipmentMemberwec:SamsonISolarEnergyCenterLLCMember2023-12-310000783325us-gaap:BuildingMemberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325wec:ElmRoadGeneratingStationUnits1And2Memberwec:WePowerLLCMember2023-12-310000783325wec:Weston4Memberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:ColumbiaEnergyCenterUnits1And2Memberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:ForwardWindEnergyCenterMemberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:TwoCreeksSolarParkMemberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:BadgerHollowSolarParkIMemberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:RedBarnWindParkMemberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:WestRiversideEnergyCenterMemberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325wec:BadgerHollowSolarParkIIMemberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325wec:KoshkonongSolarParkMemberwec:WisconsinElectricPowerCompanyAndWisconsinPublicServiceCorporationMember2023-12-310000783325wec:WisconsinElectricPowerCompanyAndWisconsinPublicServiceCorporationMemberwec:ParisSolarBatteryParkMember2023-12-310000783325wec:WisconsinElectricPowerCompanyAndWisconsinPublicServiceCorporationMemberwec:DarienSolarBatteryParkMember2023-12-310000783325wec:WisconsinSegmentMember2023-12-310000783325wec:WisconsinSegmentMember2022-12-310000783325wec:IllinoisMember2023-12-310000783325wec:IllinoisMember2022-12-310000783325wec:OtherStatesMember2023-12-310000783325wec:OtherStatesMember2022-12-3100007833252023-07-012023-09-300000783325us-gaap:OperatingAndBroadcastRightsMember2023-01-012023-12-310000783325wec:MGUMemberus-gaap:TrademarksAndTradeNamesMember2023-12-310000783325wec:WECInfrastructureLLCMemberus-gaap:CustomerContractsMember2023-12-310000783325wec:WECInfrastructureLLCMemberus-gaap:CustomerContractsMember2022-12-310000783325wec:WECInfrastructureLLCMemberus-gaap:SwapMember2023-12-310000783325wec:WECInfrastructureLLCMemberus-gaap:SwapMember2022-12-310000783325wec:WECInfrastructureLLCMemberus-gaap:ServiceAgreementsMember2023-12-310000783325wec:WECInfrastructureLLCMemberus-gaap:ServiceAgreementsMember2022-12-310000783325wec:WECInfrastructureLLCMember2023-12-310000783325wec:WECInfrastructureLLCMember2022-12-310000783325us-gaap:CustomerContractsMemberwec:BloomingGroveWindEnergyCenterLLCTatankaRidgeWindLLCJayhawkWindLLCThunderheadWindEnergyLLCSamsonISolarEnergyCenterLLCAndSapphireSkyWindEnergyLLCMember2023-01-012023-12-310000783325wec:UpstreamWindEnergyLLCMemberus-gaap:SwapMember2023-12-310000783325wec:UpstreamWindEnergyLLCMemberus-gaap:SwapMember2023-01-012023-12-310000783325wec:TatankaRidgeWindLLCAndBishopHillEnergyIIILLCMemberus-gaap:ServiceAgreementsMember2023-01-012023-12-310000783325us-gaap:SalesMember2023-12-310000783325us-gaap:OperatingExpenseMember2023-12-310000783325us-gaap:RestrictedStockMember2023-01-012023-12-310000783325us-gaap:RestrictedStockMember2022-01-012022-12-310000783325us-gaap:RestrictedStockMember2021-01-012021-12-310000783325us-gaap:PerformanceSharesMember2022-01-012022-12-310000783325us-gaap:PerformanceSharesMember2021-01-012021-12-310000783325us-gaap:EmployeeStockOptionMember2022-12-310000783325us-gaap:EmployeeStockOptionMemberus-gaap:SubsequentEventMember2024-01-012024-03-310000783325us-gaap:RestrictedStockMember2022-12-310000783325us-gaap:RestrictedStockMember2023-12-310000783325us-gaap:RestrictedStockMemberus-gaap:SubsequentEventMember2024-01-012024-03-310000783325us-gaap:PerformanceSharesMember2023-12-310000783325us-gaap:PerformanceSharesMemberus-gaap:SubsequentEventMember2024-01-012024-03-310000783325wec:PublicServiceCommissionofWisconsinMembersrt:MinimumMemberwec:WisconsinGasLLCMember2023-01-012023-12-310000783325wec:PublicServiceCommissionofWisconsinMembersrt:MinimumMemberwec:WisconsinPublicServiceCorporationMember2023-01-012023-12-310000783325wec:PublicServiceCommissionofWisconsinMembersrt:MinimumMemberwec:WisconsinElectricPowerCompanyMember2023-01-012023-12-310000783325wec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMember2023-01-012023-12-310000783325wec:Commonstockequitytototalcapitalizationislessthan25Membersrt:MaximumMemberwec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMember2023-12-310000783325srt:MaximumMemberwec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMemberwec:Commonstockequitytototalcapitalizationislessthan20Member2023-12-310000783325wec:Commonstockequitytototalcapitalizationislessthan25Memberwec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMember2023-01-012023-12-310000783325wec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMemberwec:Commonstockequitytototalcapitalizationislessthan20Member2023-01-012023-12-310000783325wec:Commonstockequitytototalcapitalizationislessthan25Membersrt:MaximumMemberwec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMember2023-01-012023-12-310000783325srt:MaximumMemberwec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMemberwec:Commonstockequitytototalcapitalizationislessthan20Member2023-01-012023-12-310000783325wec:Commonstockequitytototalcapitalizationislessthan25Membersrt:MinimumMemberwec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMember2023-01-012023-12-310000783325wec:ATCHoldingLLCMember2023-01-012023-12-310000783325wec:BluewaterGasStorageLLCMember2023-01-012023-12-310000783325wec:WECIWindHoldingIIMember2023-12-310000783325wec:WECIWindHoldingIMember2023-12-310000783325wec:WECIWindHoldingIMember2023-01-012023-12-310000783325wec:WECIWindHoldingIIMember2023-01-012023-12-310000783325srt:ParentCompanyMember2023-12-31wec:period0000783325srt:ParentCompanyMember2023-01-012023-12-3100007833252023-01-192023-01-1900007833252023-04-202023-04-2000007833252023-07-202023-07-2000007833252023-10-192023-10-190000783325us-gaap:SubsequentEventMember2024-01-182024-01-180000783325srt:MinimumMemberus-gaap:SubsequentEventMember2024-01-182024-01-180000783325srt:MaximumMemberus-gaap:SubsequentEventMember2024-01-182024-01-180000783325srt:ParentCompanyMemberwec:WEC0.01parvaluePreferredStockMember2023-12-310000783325srt:ParentCompanyMemberwec:WEC0.01parvaluePreferredStockMember2022-12-310000783325wec:SixPerCentPreferredStockMemberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325wec:SixPerCentPreferredStockMemberwec:WisconsinElectricPowerCompanyMember2022-12-310000783325wec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMember2022-12-310000783325wec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMember2023-12-310000783325wec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock360SeriesRedeemableMember2022-01-012022-12-310000783325wec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock25ParValueAuthorized5000000SharesNoneOutstandingMember2022-12-310000783325wec:WisconsinElectricPowerCompanyMemberwec:SerialPreferredStock25ParValueAuthorized5000000SharesNoneOutstandingMember2023-12-310000783325wec:A100parvaluePreferredStockWPSMemberwec:WisconsinPublicServiceCorporationMember2022-12-310000783325wec:A100parvaluePreferredStockWPSMemberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:A100parvalueCumulativePreferredStockPGLMemberwec:ThePeoplesGasLightAndCokeCompanyMember2023-12-310000783325wec:A100parvalueCumulativePreferredStockPGLMemberwec:ThePeoplesGasLightAndCokeCompanyMember2022-12-310000783325wec:NorthShoreGasCompanyMemberwec:A100parvalueCumulativePreferredStockNSGMember2022-12-310000783325wec:NorthShoreGasCompanyMemberwec:A100parvalueCumulativePreferredStockNSGMember2023-12-310000783325wec:SixPerCentPreferredStockMemberwec:WisconsinElectricPowerCompanyMember2023-01-012023-12-310000783325wec:SixPerCentPreferredStockMemberwec:WisconsinElectricPowerCompanyMember2022-01-012022-12-310000783325us-gaap:CommercialPaperMember2023-12-310000783325us-gaap:CommercialPaperMember2022-12-310000783325us-gaap:LoansPayableMember2023-12-310000783325us-gaap:LoansPayableMember2022-12-310000783325us-gaap:CommercialPaperMember2023-01-012023-12-310000783325srt:ParentCompanyMemberus-gaap:RevolvingCreditFacilityMember2023-12-310000783325srt:ParentCompanyMemberwec:CreditFacilityMaturingOctober2024Member2023-12-310000783325us-gaap:RevolvingCreditFacilityMemberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325us-gaap:RevolvingCreditFacilityMemberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325us-gaap:RevolvingCreditFacilityMemberwec:WisconsinGasMember2023-12-310000783325us-gaap:RevolvingCreditFacilityMemberwec:ThePeoplesGasLightAndCokeCompanyMember2023-12-310000783325us-gaap:LetterOfCreditMember2023-12-31wec:extension0000783325us-gaap:RevolvingCreditFacilityMemberwec:WisconsinElectricPowerCompanyMember2023-01-012023-12-310000783325us-gaap:RevolvingCreditFacilityMemberwec:ThePeoplesGasLightAndCokeCompanyMember2023-01-012023-12-310000783325srt:ParentCompanyMemberus-gaap:RevolvingCreditFacilityMember2023-01-012023-12-310000783325us-gaap:RevolvingCreditFacilityMemberwec:WisconsinPublicServiceCorporationMember2023-01-012023-12-310000783325us-gaap:RevolvingCreditFacilityMemberwec:WisconsinGasMember2023-01-012023-12-310000783325srt:ParentCompanyMember2022-12-310000783325srt:ParentCompanyMemberwec:FloatingRateWECEnergyGroupJuniorNotesDue2067Member2023-12-310000783325srt:ParentCompanyMemberwec:FloatingRateWECEnergyGroupJuniorNotesDue2067Member2022-12-310000783325wec:WisconsinElectricPowerCompanyMember2023-12-310000783325wec:WisconsinElectricPowerCompanyMember2022-12-310000783325wec:WEPCoEnvironmentalTrustFinanceILLCMember2023-12-310000783325wec:WEPCoEnvironmentalTrustFinanceILLCMember2022-12-310000783325wec:WisconsinPublicServiceCorporationMember2023-12-310000783325wec:WisconsinPublicServiceCorporationMember2022-12-310000783325wec:WisconsinGasLLCMember2023-12-310000783325wec:WisconsinGasLLCMember2022-12-310000783325wec:IntegrysHoldingIncMemberwec:A600IntegrysHoldingIncJuniorNotesDue2073Member2023-12-310000783325wec:IntegrysHoldingIncMemberwec:A600IntegrysHoldingIncJuniorNotesDue2073Member2022-12-310000783325wec:ThePeoplesGasLightAndCokeCompanyMember2023-12-310000783325wec:ThePeoplesGasLightAndCokeCompanyMember2022-12-310000783325wec:NorthShoreGasCompanyMember2023-12-310000783325wec:NorthShoreGasCompanyMember2022-12-310000783325wec:MinnesotaEnergyResourcesCorporationMember2023-12-310000783325wec:MinnesotaEnergyResourcesCorporationMember2022-12-310000783325wec:MGUMember2023-12-310000783325wec:MGUMember2022-12-310000783325wec:UpperMichiganEnergyResourcesCorporationMember2023-12-310000783325wec:UpperMichiganEnergyResourcesCorporationMember2022-12-310000783325wec:BluewaterGasStorageLLCMember2023-12-310000783325wec:BluewaterGasStorageLLCMember2022-12-310000783325wec:ATCHoldingLLCMember2023-12-310000783325wec:ATCHoldingLLCMember2022-12-310000783325wec:WePowerLLCMember2023-12-310000783325wec:WePowerLLCMember2022-12-310000783325wec:WisconsinEnergyCapitalCorporationMember2023-12-310000783325wec:WisconsinEnergyCapitalCorporationMember2022-12-310000783325wec:WECIWindHoldingIMember2022-12-310000783325wec:WECIWindHoldingIIMember2022-12-310000783325wec:JayhawkWindLLCMember2023-12-310000783325wec:JayhawkWindLLCMember2022-12-310000783325srt:ParentCompanyMemberwec:A620WECEnergyGroupUnsecuredSeniorNotesDue2033Member2023-12-310000783325wec:CollateralizedFirstMortgageBondsMemberwec:ThePeoplesGasLightAndCokeCompanyMember2023-12-310000783325srt:ParentCompanyMemberwec:FloatingRateWECEnergyGroupJuniorNotesDue2067Member2023-08-150000783325srt:ParentCompanyMemberwec:FloatingRateWECEnergyGroupJuniorNotesDue2067Member2023-08-152023-08-150000783325srt:ParentCompanyMemberwec:WEC475SeniorNotesDueJanuary92026Member2023-01-012023-01-310000783325srt:ParentCompanyMemberwec:WEC475SeniorNotesDueJanuary92026Member2023-01-310000783325srt:ParentCompanyMemberwec:WEC475450MSeniorNotesDueJanuary152028Member2023-01-012023-01-310000783325srt:ParentCompanyMemberwec:WEC475450MSeniorNotesDueJanuary152028Member2023-01-310000783325srt:ParentCompanyMemberwec:WEC475SeniorNotesDueJanuary92026Member2023-04-012023-04-300000783325srt:ParentCompanyMemberwec:WEC475SeniorNotesDueJanuary92026Member2023-04-300000783325srt:ParentCompanyMemberwec:WEC560SeniorNotesDueSeptember122026Member2023-09-012023-09-300000783325srt:ParentCompanyMemberwec:WEC560SeniorNotesDueSeptember122026Member2023-09-300000783325srt:ParentCompanyMemberwec:WEC055SeniorNotesDueSeptember152023Member2023-09-012023-09-300000783325srt:ParentCompanyMemberwec:WEC055SeniorNotesDueSeptember152023Member2023-09-300000783325srt:ParentCompanyMemberwec:FloatingRateWECEnergyGroupJuniorNotesDue2067Memberus-gaap:SubsequentEventMember2024-01-262024-02-070000783325srt:ParentCompanyMemberwec:FloatingRateWECEnergyGroupJuniorNotesDue2067Memberus-gaap:SubsequentEventMember2024-02-070000783325wec:A600IntegrysHoldingIncJuniorNotesDue2073Memberwec:IntegrysHoldingMember2023-03-012023-03-310000783325wec:A600IntegrysHoldingIncJuniorNotesDue2073Memberwec:IntegrysHoldingMember2023-03-310000783325wec:A600IntegrysHoldingIncJuniorNotesDue2073Memberwec:IntegrysHoldingMember2023-08-012023-08-310000783325wec:A600IntegrysHoldingIncJuniorNotesDue2073Memberwec:IntegrysHoldingMember2023-08-310000783325wec:A582PGLSeriesNNNBondsDue2029Memberwec:ThePeoplesGasLightAndCokeCompanyMember2023-11-012023-11-300000783325wec:A582PGLSeriesNNNBondsDue2029Memberwec:ThePeoplesGasLightAndCokeCompanyMember2023-11-300000783325wec:A582NSGSeriesTBondsDue2029Memberwec:NorthShoreGasCompanyMember2023-11-012023-11-300000783325wec:A582NSGSeriesTBondsDue2029Memberwec:NorthShoreGasCompanyMember2023-11-300000783325srt:ParentCompanyMemberwec:WEC0.80600MSeniorNotesDueMarch2024Member2023-12-310000783325wec:WisconsinGasLLCMemberwec:A2.38WGDebenturesDueNovember2024Member2023-12-310000783325wec:A2.64PGLBondsDueNovember2024Memberwec:ThePeoplesGasLightAndCokeCompanyMember2023-12-310000783325wec:A2.05WEDebenturesDueDecember2024Memberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325wec:WEPCoEnvironmentalTrustBonds1578Due2035Memberwec:WEPCoEnvironmentalTrustFinanceILLCMember2023-12-310000783325wec:A376BluewaterGasStorageSeniorLLCNotesDue2047Memberwec:BluewaterGasStorageLLCMember2023-12-310000783325wec:WePowerLLCMemberwec:A491WePowerLLCSubsidiariesNotesDue2005Through2030Member2023-12-310000783325wec:WePowerLLCMemberwec:A5209WePowerLLCSubsidiariesNoteDue2010Through2030Member2023-12-310000783325wec:WePowerLLCMemberwec:A4673WePowerLLCSubsidiariesNotesDue2011Through2031Member2023-12-310000783325wec:WePowerLLCMemberwec:A600WePowerLLCSubsidiariesNotesDue2008Through2033Member2023-12-310000783325wec:A275WECIWindHoldingILLCSeniorNotesDue2032Memberwec:WECIWindHoldingIMember2023-12-310000783325wec:A638WECIWindHoldingIILLCSeniorNotesDue2031Memberwec:WECIWindHoldingIIMember2022-12-310000783325wec:A638WECIWindHoldingIILLCSeniorNotesDue2031Memberwec:WECIWindHoldingIIMember2023-12-310000783325wec:LandLeaseUtilitySolarGenerationMember2023-01-012023-12-31wec:renewal_terms0000783325wec:LandLeaseUtilitySolarGenerationMember2023-12-310000783325wec:PowerPurchaseContractMember2022-01-012022-05-310000783325wec:PowerPurchaseContractMember2022-05-310000783325wec:PowerPurchaseContractMember2023-12-310000783325wec:PowerPurchaseContractMember2022-12-310000783325wec:LandLeaseUtilitySolarGenerationMember2022-12-310000783325wec:OtherFinanceLeaseMember2023-12-310000783325wec:OtherFinanceLeaseMember2022-12-310000783325wec:Rate2018And2019Memberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-01-012022-12-310000783325wec:Rate2018And2019Memberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2021-01-012021-12-310000783325wec:Rate2018And2019Memberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2023-01-012023-12-310000783325wec:Rates2020and2021Memberwec:ElectricRateRequestMemberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2020-01-010000783325wec:Rates2020and2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2020-01-010000783325wec:Rates2020and2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2023-01-012023-12-310000783325wec:Rates2020and2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2021-01-012021-12-310000783325wec:Rates2020and2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-01-012022-12-310000783325us-gaap:DomesticCountryMember2023-12-310000783325us-gaap:StateAndLocalJurisdictionMember2023-12-310000783325us-gaap:DomesticCountryMember2022-12-310000783325us-gaap:StateAndLocalJurisdictionMember2022-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwec:CommodityContractNaturalGasMember2023-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwec:CommodityContractNaturalGasMember2023-12-310000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2023-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2023-12-310000783325wec:CommodityContractFinancialTransmissionRightsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325wec:CommodityContractFinancialTransmissionRightsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325wec:CommodityContractFinancialTransmissionRightsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310000783325wec:CommodityContractFinancialTransmissionRightsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310000783325us-gaap:FairValueMeasurementsRecurringMember2023-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwec:CommodityContractNaturalGasMember2022-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwec:CommodityContractNaturalGasMember2022-12-310000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2022-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2022-12-310000783325wec:CommodityContractFinancialTransmissionRightsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325wec:CommodityContractFinancialTransmissionRightsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325wec:CommodityContractFinancialTransmissionRightsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000783325wec:CommodityContractFinancialTransmissionRightsMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000783325us-gaap:FairValueMeasurementsRecurringMember2022-12-310000783325us-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310000783325us-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310000783325us-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310000783325us-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310000783325us-gaap:DesignatedAsHedgingInstrumentMember2022-12-31wec:Instruments0000783325us-gaap:DesignatedAsHedgingInstrumentMember2023-12-310000783325wec:CommodityContractNaturalGasMember2023-12-310000783325wec:CommodityContractNaturalGasMember2022-12-310000783325wec:CommodityContractFinancialTransmissionRightsMember2023-12-310000783325wec:CommodityContractFinancialTransmissionRightsMember2022-12-310000783325us-gaap:CoalContractMember2023-12-310000783325us-gaap:CoalContractMember2022-12-310000783325us-gaap:PublicUtilitiesMember2022-01-012022-12-310000783325us-gaap:PublicUtilitiesMember2023-01-012023-12-310000783325us-gaap:PublicUtilitiesMember2021-01-012021-12-310000783325wec:NonUtilityEnergyInfrastructureMember2023-01-012023-12-310000783325wec:NonUtilityEnergyInfrastructureMember2022-01-012022-12-310000783325wec:NonUtilityEnergyInfrastructureMember2021-01-012021-12-310000783325wec:CommodityContractNaturalGasMember2023-01-012023-12-31utr:MMBTU0000783325wec:CommodityContractNaturalGasMember2022-01-012022-12-310000783325wec:CommodityContractNaturalGasMember2021-01-012021-12-310000783325wec:CommodityContractFinancialTransmissionRightsMember2023-01-012023-12-31utr:MWh0000783325wec:CommodityContractFinancialTransmissionRightsMember2022-01-012022-12-310000783325wec:CommodityContractFinancialTransmissionRightsMember2021-01-012021-12-310000783325srt:ParentCompanyMemberus-gaap:InterestRateSwapMember2021-11-15wec:number_of_interest_rate_swaps0000783325srt:ParentCompanyMemberwec:FloatingRateWECEnergyGroupJuniorNotesDue2067Member2021-11-150000783325us-gaap:StandbyLettersOfCreditMember2023-12-310000783325us-gaap:SuretyBondMember2023-12-310000783325us-gaap:GuaranteeTypeOtherMember2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMember2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMember2021-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000783325us-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310000783325us-gaap:PensionPlansDefinedBenefitMember2022-01-012022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-12-310000783325us-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberwec:BenefitobligationassumptionsMember2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberwec:BenefitobligationassumptionsMember2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberwec:BenefitobligationassumptionsMember2021-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:BenefitobligationassumptionsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:BenefitobligationassumptionsMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:BenefitobligationassumptionsMember2021-12-310000783325us-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310000783325wec:PensionAndOtherPostretirementPlansCostMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:PensionAndOtherPostretirementPlansCostMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Pre65Memberwec:BenefitobligationassumptionsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Pre65Memberwec:BenefitobligationassumptionsMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Pre65Memberwec:BenefitobligationassumptionsMember2023-01-012023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Pre65Memberwec:BenefitobligationassumptionsMember2022-01-012022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:BenefitobligationassumptionsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:BenefitobligationassumptionsMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:BenefitobligationassumptionsMember2023-01-012023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:BenefitobligationassumptionsMember2022-01-012022-12-310000783325wec:NetperiodicbenefitcostassumptionsMemberus-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310000783325wec:NetperiodicbenefitcostassumptionsMemberus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-12-310000783325wec:NetperiodicbenefitcostassumptionsMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMember2023-01-012023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMember2022-01-012022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMember2021-01-012021-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMemberwec:Pre65Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMemberwec:Pre65Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMemberwec:Pre65Member2021-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMemberwec:Pre65Member2023-01-012023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMemberwec:Pre65Member2022-01-012022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMemberwec:Pre65Member2021-01-012021-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:NetperiodicbenefitcostassumptionsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:NetperiodicbenefitcostassumptionsMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:NetperiodicbenefitcostassumptionsMember2021-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:NetperiodicbenefitcostassumptionsMember2023-01-012023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:NetperiodicbenefitcostassumptionsMember2022-01-012022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Post65Memberwec:NetperiodicbenefitcostassumptionsMember2021-01-012021-12-310000783325wec:NetperiodicbenefitcostassumptionsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:SubsequentEventMember2024-01-012024-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:NetperiodicbenefitcostassumptionsMemberus-gaap:SubsequentEventMember2024-01-012024-12-310000783325us-gaap:DefinedBenefitPlanEquitySecuritiesMemberwec:WisconsinEnergyMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:DefinedBenefitPlanDebtSecurityMemberwec:WisconsinEnergyMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325wec:WisconsinEnergyMemberwec:PrivateEquityandRealEstateMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:DefinedBenefitPlanEquitySecuritiesMemberwec:IntegrysHoldingIncMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:DefinedBenefitPlanDebtSecurityMemberwec:IntegrysHoldingIncMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325wec:IntegrysHoldingIncMemberwec:PrivateEquityandRealEstateMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberwec:WisconsinEnergyMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMemberwec:WisconsinEnergyMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:WisconsinEnergyMemberwec:RealEstateInvestmentsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberwec:IntegrysHoldingIncMemberwec:Largesttrust2Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Largesttrust1Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberwec:IntegrysHoldingIncMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMemberwec:IntegrysHoldingIncMemberwec:Largesttrust2Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Largesttrust1Memberus-gaap:DefinedBenefitPlanDebtSecurityMemberwec:IntegrysHoldingIncMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:Largesttrust1Memberwec:IntegrysHoldingIncMemberwec:RealEstateInvestmentsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:IntegrysHoldingIncMemberwec:Largesttrust2Memberwec:RealEstateInvestmentsMember2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2023-12-310000783325us-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel3Member2023-12-310000783325us-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel3Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2023-12-310000783325us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2023-12-310000783325us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel12And3Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberwec:DebtSecurityGovernmentandCorporateNonUSMember2023-12-310000783325us-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberwec:DebtSecurityGovernmentandCorporateNonUSMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel12And3Memberwec:DebtSecurityGovernmentandCorporateNonUSMember2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2023-12-310000783325us-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel12And3Member2023-12-310000783325us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310000783325us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FixedIncomeSecuritiesMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FixedIncomeSecuritiesMember2023-12-310000783325us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2023-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherInvestmentsMember2023-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2022-12-310000783325us-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesUsMember2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel3Member2022-12-310000783325us-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMemberus-gaap:FairValueInputsLevel3Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2022-12-310000783325us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:USTreasurySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2022-12-310000783325us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel12And3Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberwec:DebtSecurityGovernmentandCorporateNonUSMember2022-12-310000783325us-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberwec:DebtSecurityGovernmentandCorporateNonUSMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberwec:DebtSecurityGovernmentandCorporateNonUSMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel12And3Memberwec:DebtSecurityGovernmentandCorporateNonUSMember2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2022-12-310000783325us-gaap:FairValueInputsLevel12And3Memberus-gaap:PensionPlansDefinedBenefitMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel12And3Member2022-12-310000783325us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000783325us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FixedIncomeSecuritiesMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FixedIncomeSecuritiesMember2022-12-310000783325us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2022-12-310000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:OtherInvestmentsMember2022-12-31wec:memberwec:vote0000783325wec:ATCMember2022-12-310000783325wec:ATCHoldcoLLCMember2022-12-310000783325wec:TransmissionAffiliatesMember2022-12-310000783325wec:ATCMember2023-01-012023-12-310000783325wec:ATCHoldcoLLCMember2023-01-012023-12-310000783325wec:TransmissionAffiliatesMember2023-01-012023-12-310000783325wec:TransmissionAffiliatesMember2023-12-310000783325wec:ATCMember2021-12-310000783325wec:ATCHoldcoLLCMember2021-12-310000783325wec:TransmissionAffiliatesMember2021-12-310000783325wec:ATCMember2022-01-012022-12-310000783325wec:ATCHoldcoLLCMember2022-01-012022-12-310000783325wec:TransmissionAffiliatesMember2022-01-012022-12-310000783325wec:ATCMember2020-12-310000783325wec:ATCHoldcoLLCMember2020-12-310000783325wec:TransmissionAffiliatesMember2020-12-310000783325wec:ATCMember2021-01-012021-12-310000783325wec:ATCHoldcoLLCMember2021-01-012021-12-310000783325wec:TransmissionAffiliatesMember2021-01-012021-12-310000783325wec:ATCMember2023-01-012023-12-310000783325wec:ATCMember2022-01-012022-12-310000783325wec:ATCMember2021-01-012021-12-310000783325wec:ATCMember2023-12-310000783325wec:ATCMember2022-12-31wec:numberOfSegments0000783325wec:ElectricTransmissionSegmentMemberwec:ATCMember2023-12-310000783325wec:ATCHoldcoLLCMemberwec:ElectricTransmissionSegmentMember2023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:ExternalRevenuesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMemberwec:ExternalRevenuesMember2023-01-012023-12-310000783325us-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMemberwec:ExternalRevenuesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:ExternalRevenuesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMemberwec:ExternalRevenuesMember2023-01-012023-12-310000783325us-gaap:IntersegmentEliminationMemberwec:ExternalRevenuesMember2023-01-012023-12-310000783325wec:ExternalRevenuesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:IntersegmentTransactionsMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMemberwec:IntersegmentTransactionsMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:IntersegmentTransactionsMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:IntersegmentTransactionsMemberus-gaap:CorporateAndOtherMember2023-01-012023-12-310000783325us-gaap:IntersegmentEliminationMemberwec:IntersegmentTransactionsMember2023-01-012023-12-310000783325wec:IntersegmentTransactionsMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMember2023-01-012023-12-310000783325us-gaap:IntersegmentEliminationMember2023-01-012023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2023-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMember2023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2023-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMember2023-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2023-12-310000783325us-gaap:IntersegmentEliminationMember2023-12-310000783325us-gaap:IntersegmentEliminationMemberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:ExternalRevenuesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMemberwec:ExternalRevenuesMember2022-01-012022-12-310000783325us-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMemberwec:ExternalRevenuesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:ExternalRevenuesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMemberwec:ExternalRevenuesMember2022-01-012022-12-310000783325us-gaap:IntersegmentEliminationMemberwec:ExternalRevenuesMember2022-01-012022-12-310000783325wec:ExternalRevenuesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:IntersegmentTransactionsMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMemberwec:IntersegmentTransactionsMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:IntersegmentTransactionsMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:IntersegmentTransactionsMemberus-gaap:CorporateAndOtherMember2022-01-012022-12-310000783325us-gaap:IntersegmentEliminationMemberwec:IntersegmentTransactionsMember2022-01-012022-12-310000783325wec:IntersegmentTransactionsMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMember2022-01-012022-12-310000783325us-gaap:IntersegmentEliminationMember2022-01-012022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2022-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMember2022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2022-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMember2022-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2022-12-310000783325us-gaap:IntersegmentEliminationMember2022-12-310000783325us-gaap:IntersegmentEliminationMemberwec:WisconsinElectricPowerCompanyMember2022-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:ExternalRevenuesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMemberwec:ExternalRevenuesMember2021-01-012021-12-310000783325us-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMemberwec:ExternalRevenuesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:ExternalRevenuesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMemberwec:ExternalRevenuesMember2021-01-012021-12-310000783325us-gaap:IntersegmentEliminationMemberwec:ExternalRevenuesMember2021-01-012021-12-310000783325wec:ExternalRevenuesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:IntersegmentTransactionsMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMemberwec:IntersegmentTransactionsMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMemberwec:IntersegmentTransactionsMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:IntersegmentTransactionsMemberus-gaap:CorporateAndOtherMember2021-01-012021-12-310000783325us-gaap:IntersegmentEliminationMemberwec:IntersegmentTransactionsMember2021-01-012021-12-310000783325wec:IntersegmentTransactionsMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMember2021-01-012021-12-310000783325us-gaap:IntersegmentEliminationMember2021-01-012021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMember2021-12-310000783325us-gaap:OperatingSegmentsMemberwec:IllinoisMemberus-gaap:PublicUtilitiesMember2021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:PublicUtilitiesMemberwec:OtherStatesMember2021-12-310000783325us-gaap:PublicUtilitiesMember2021-12-310000783325us-gaap:OperatingSegmentsMemberwec:ElectricTransmissionSegmentMember2021-12-310000783325us-gaap:OperatingSegmentsMemberwec:NonUtilityEnergyInfrastructureMember2021-12-310000783325us-gaap:OperatingSegmentsMemberus-gaap:CorporateAndOtherMember2021-12-310000783325us-gaap:IntersegmentEliminationMember2021-12-310000783325us-gaap:IntersegmentEliminationMemberwec:WisconsinElectricPowerCompanyMember2021-12-310000783325us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-11-012020-11-300000783325wec:PowerPurchaseCommitmentMember2022-05-310000783325wec:PowerPurchaseCommitmentMember2023-01-010000783325wec:NuclearMemberus-gaap:ElectricityUsRegulatedMember2023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:CoalSupplyAndTransportationMember2023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:PurchasedPowerMember2023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:OtherCommitmentMember2023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:NaturalGasSupplyAndTransportationMember2023-12-310000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:ElectricityUsRegulatedMemberwec:PurchasedPowerMember2023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:NaturalGasStorageandTransportationMemberwec:NonUtilityEnergyInfrastructureMember2023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:CrossStateAirPollutionRuleMembersrt:MaximumMember2023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:MercuryAndAirToxicsStandardsMember2023-04-012023-04-300000783325us-gaap:ElectricityUsRegulatedMembersrt:MinimumMemberwec:NationalAmbientAirQualityStandardsMember2023-08-012023-08-310000783325us-gaap:ElectricityUsRegulatedMemberwec:NationalAmbientAirQualityStandardsMembersrt:MaximumMember2023-08-012023-08-310000783325us-gaap:ElectricityUsRegulatedMemberwec:NationalAmbientAirQualityStandardsMember2023-10-012023-10-31wec:Statesutr:M0000783325us-gaap:ElectricityUsRegulatedMemberwec:NationalAmbientAirQualityStandardsMember2020-12-012020-12-31wec:micrograms0000783325us-gaap:ElectricityUsRegulatedMembersrt:MinimumMemberwec:NationalAmbientAirQualityStandardsMember2023-01-012023-01-310000783325us-gaap:ElectricityUsRegulatedMemberwec:NationalAmbientAirQualityStandardsMembersrt:MaximumMember2023-01-012023-01-310000783325us-gaap:ElectricityUsRegulatedMemberwec:NationalAmbientAirQualityStandardsMembersrt:MaximumMemberus-gaap:SubsequentEventMember2024-02-070000783325us-gaap:ElectricityUsRegulatedMemberwec:ClimateChangeMember2023-05-012023-05-310000783325us-gaap:ElectricityUsRegulatedMemberwec:ClimateChangeMember2023-05-310000783325us-gaap:ElectricityUsRegulatedMembersrt:MaximumMemberwec:ClimateChangeMember2023-05-310000783325us-gaap:ElectricityUsRegulatedMemberwec:ClimateChangeMember2023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:ClimateChangeMember2023-01-012023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:ClimateChangeMember2021-05-012021-05-310000783325us-gaap:ElectricityUsRegulatedMemberwec:CleanWaterActCoolingWaterIntakeStructureRuleMember2023-01-012023-12-31wec:generating_units0000783325us-gaap:ElectricityUsRegulatedMemberwec:SteamElectricEffluentGuidelinesMember2023-01-012023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:SteamElectricEffluentGuidelinesMember2023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:SteamElectricEffluentGuidelinesMemberwec:WisconsinElectricPowerCompanyMemberwec:OCPPUnits7And8OwnedByWEMember2021-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:ElmRoadGeneratingStationMemberwec:SteamElectricEffluentGuidelinesMemberwec:WisconsinElectricPowerCompanyMember2021-12-310000783325wec:Weston3Memberus-gaap:ElectricityUsRegulatedMemberwec:SteamElectricEffluentGuidelinesMemberwec:WisconsinPublicServiceCorporationMember2023-06-300000783325us-gaap:ElectricityUsRegulatedMemberwec:ElmRoadGeneratingStationMemberwec:SteamElectricEffluentGuidelinesMemberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:ManufacturedGasPlantRemediationMemberus-gaap:EnvironmentalRestorationCostsMember2023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:ManufacturedGasPlantRemediationMemberus-gaap:EnvironmentalRestorationCostsMember2022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:ManufacturedGasPlantRemediationMember2023-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:ManufacturedGasPlantRemediationMember2022-12-310000783325stpr:WIus-gaap:ElectricityUsRegulatedMemberwec:RenewablesEfficiencyAndConservationMember2023-12-310000783325stpr:WIus-gaap:ElectricityUsRegulatedMemberwec:RenewablesEfficiencyAndConservationMemberwec:WisconsinElectricPowerCompanyMember2023-12-310000783325stpr:WIus-gaap:ElectricityUsRegulatedMemberwec:RenewablesEfficiencyAndConservationMemberwec:WisconsinPublicServiceCorporationMember2023-12-310000783325stpr:WIus-gaap:ElectricityUsRegulatedMemberwec:RenewablesEfficiencyAndConservationMember2023-01-012023-12-310000783325us-gaap:ElectricityUsRegulatedMemberstpr:MIwec:RenewablesEfficiencyAndConservationMember2023-12-310000783325us-gaap:ElectricityUsRegulatedMemberstpr:MIwec:RenewablesEfficiencyAndConservationMember2023-11-30wec:Years0000783325wec:A2024RateCaseReOpenerMember2023-01-012023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:A2024RateCaseReOpenerMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2023-12-202023-12-200000783325us-gaap:ElectricityUsRegulatedMemberwec:A2024RateCaseReOpenerMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2023-12-202023-12-200000783325us-gaap:NaturalGasUsRegulatedMemberwec:A2024RateCaseReOpenerMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2023-12-202023-12-200000783325us-gaap:NaturalGasUsRegulatedMemberwec:A2024RateCaseReOpenerMemberwec:WisconsinGasLLCMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2023-12-202023-12-200000783325wec:A2023And2024RatesMember2023-01-012023-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:A2023And2024RatesMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-12-012022-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:A2023And2024RatesMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2022-12-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:A2023And2024RatesMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-12-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:A2023And2024RatesMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2022-12-012022-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:A2023And2024RatesMemberwec:WisconsinGasLLCMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-12-012022-12-310000783325wec:A2023And2024RatesMemberwec:SteamRateRequestMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-12-012022-12-310000783325wec:A2023And2024RatesMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-12-012022-12-310000783325wec:A2023And2024RatesMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2022-12-012022-12-310000783325wec:A2023And2024RatesMemberwec:WisconsinGasLLCMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-12-012022-12-310000783325wec:A2023And2024RatesMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2022-12-012022-12-310000783325wec:A2022RatesMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2021-09-012021-09-300000783325wec:A2022RatesMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2021-09-30wec:utility0000783325wec:Rates2020and2021Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2020and2021Member2023-01-012023-12-310000783325wec:Rates2020and2021Memberus-gaap:ElectricityUsRegulatedMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2020and2021Memberus-gaap:ElectricityUsRegulatedMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:Rates2020and2021Memberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:Rates2020and2021Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:Rates2020and2021Memberwec:WisconsinGasLLCMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2020and2021Memberwec:SteamRateRequestMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2020and2021Memberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2020and2021Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-012019-12-310000783325wec:Rates2020and2021Memberwec:WisconsinGasLLCMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2020and2021Memberus-gaap:ElectricityUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:Rates2020Memberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:Rates2021Memberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:Rates2020Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-012019-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:Rates2021Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-012019-12-310000783325wec:Rates2020and2021Memberus-gaap:ElectricityUsRegulatedMemberwec:EarningsSharingMechanismsMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-012019-12-310000783325wec:Rates2020and2021Memberus-gaap:ElectricityUsRegulatedMemberwec:EarningsSharingMechanismsMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:Rates2020and2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:Rates2020and2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:Rates2020Memberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:Rates2021Memberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:Rates2020Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:Rates2021Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:WisconsinGasLLCMemberwec:Rates2021Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325us-gaap:NaturalGasUsRegulatedMemberwec:TaxCutsAndJobsActOf2017Memberwec:WisconsinGasLLCMemberwec:Rates2020Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325us-gaap:ElectricityUsRegulatedMemberwec:WEPCoEnvironmentalTrustBonds1578Due2035Memberwec:WEPCoEnvironmentalTrustFinanceILLCMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2021-05-012021-05-310000783325us-gaap:ElectricityUsRegulatedMemberwec:WEPCoEnvironmentalTrustBonds1578Due2035Memberwec:WEPCoEnvironmentalTrustFinanceILLCMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2021-05-310000783325wec:ReACTMemberwec:Rates2020and2021Memberus-gaap:ElectricityUsRegulatedMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2019-12-310000783325wec:A2023RateOrderMemberwec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2023-11-162023-11-160000783325wec:NSGMemberwec:A2023RateOrderMemberwec:IllinoisCommerceCommissionICCMember2023-11-162023-11-160000783325wec:A2023RateOrderMemberwec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2023-11-160000783325wec:NSGMemberwec:A2023RateOrderMemberwec:IllinoisCommerceCommissionICCMember2023-11-160000783325wec:A2023RateOrderMemberwec:IllinoisCommerceCommissionICCMember2023-01-012023-12-310000783325wec:A2023RateOrderMemberwec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2023-01-012023-12-310000783325wec:NSGMemberwec:A2023RateOrderMemberwec:IllinoisCommerceCommissionICCMember2023-01-012023-12-310000783325wec:TPTFARiderMemberwec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2021-12-310000783325wec:NSGMemberwec:A2021RateOrderMemberwec:IllinoisCommerceCommissionICCMember2021-09-012021-09-300000783325wec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2016-01-012022-12-310000783325wec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2023-12-31wec:Assurance0000783325wec:MinnesotaEnergyResourcesCorporationMemberwec:MinnesotaPublicUtilitiesCommissionMPUCMember2022-12-012022-12-310000783325wec:MinnesotaEnergyResourcesCorporationMemberwec:MinnesotaPublicUtilitiesCommissionMPUCMember2023-11-142023-11-140000783325wec:MinnesotaEnergyResourcesCorporationMemberus-gaap:RevenueSubjectToRefundMemberwec:MinnesotaPublicUtilitiesCommissionMPUCMember2023-12-310000783325wec:MGUMemberwec:MichiganPublicServiceCommissionMPSCMember2023-08-302023-08-300000783325wec:MGUMemberwec:MichiganPublicServiceCommissionMPSCMember2020-07-310000783325wec:MGUMemberwec:MichiganPublicServiceCommissionMPSCMember2021-09-012021-09-300000783325wec:EnergyCostsRecoverableThroughRateAdjustmentsMemberwec:WisconsinElectricPowerCompanyMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2021-03-310000783325wec:EnergyCostsRecoverableThroughRateAdjustmentsMemberwec:WisconsinGasLLCMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2021-03-310000783325wec:EnergyCostsRecoverableThroughRateAdjustmentsMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinPublicServiceCorporationMember2021-03-310000783325wec:EnergyCostsRecoverableThroughRateAdjustmentsMemberwec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2021-02-280000783325wec:NSGMemberwec:EnergyCostsRecoverableThroughRateAdjustmentsMemberwec:IllinoisCommerceCommissionICCMember2021-02-280000783325wec:MinnesotaEnergyResourcesCorporationMemberwec:EnergyCostsRecoverableThroughRateAdjustmentsMemberwec:MinnesotaPublicUtilitiesCommissionMPUCMember2021-02-280000783325wec:MinnesotaEnergyResourcesCorporationMemberwec:MinnesotaPublicUtilitiesCommissionMPUCMember2021-08-310000783325wec:MinnesotaEnergyResourcesCorporationMemberwec:EnergyCostsRecoverableThroughRateAdjustmentsMemberwec:MinnesotaPublicUtilitiesCommissionMPUCMember2021-08-310000783325wec:MinnesotaEnergyResourcesCorporationMemberwec:MinnesotaPublicUtilitiesCommissionMPUCMemberus-gaap:AssetRecoverableGasCostsMember2021-08-310000783325wec:MinnesotaEnergyResourcesCorporationMemberwec:MinnesotaPublicUtilitiesCommissionMPUCMemberus-gaap:AssetRecoverableGasCostsMember2022-10-310000783325us-gaap:OtherInvesteesMember2023-01-012023-12-310000783325us-gaap:OtherInvesteesMember2022-01-012022-12-310000783325us-gaap:OtherInvesteesMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:FloatingRateWECEnergyGroupJuniorNotesDue2067Member2023-07-0100007833252023-10-012023-12-310000783325srt:ParentCompanyMember2022-01-012022-12-310000783325srt:ParentCompanyMember2021-01-012021-12-310000783325srt:ParentCompanyMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2023-01-012023-12-310000783325srt:ParentCompanyMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-01-012022-12-310000783325srt:ParentCompanyMemberus-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-01-012021-12-310000783325srt:ParentCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-01-012023-12-310000783325srt:ParentCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-01-012022-12-310000783325srt:ParentCompanyMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-12-310000783325us-gaap:RelatedPartyMembersrt:ParentCompanyMember2023-12-310000783325us-gaap:RelatedPartyMembersrt:ParentCompanyMember2022-12-310000783325srt:ParentCompanyMember2021-12-310000783325srt:ParentCompanyMember2020-12-310000783325srt:ParentCompanyMemberwec:WisconsinElectricPowerCompanyMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:WisconsinElectricPowerCompanyMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:WisconsinElectricPowerCompanyMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:WePowerLLCMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:WePowerLLCMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:WePowerLLCMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:WisconsinGasLLCMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:WisconsinGasLLCMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:WisconsinGasLLCMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:ATCHoldingLLCMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:ATCHoldingLLCMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:ATCHoldingLLCMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:UpperMichiganEnergyResourcesCorporationMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:UpperMichiganEnergyResourcesCorporationMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:UpperMichiganEnergyResourcesCorporationMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:WisparkLLCMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:WisparkLLCMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:WisparkLLCMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:BluewaterMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:BluewaterMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:BluewaterMember2021-01-012021-12-310000783325wec:WECInfrastructureLLCMember2023-01-012023-12-310000783325wec:WECInfrastructureLLCMember2022-01-012022-12-310000783325wec:WECInfrastructureLLCMember2021-01-012021-12-310000783325wec:ATCHoldingLLCMember2021-01-012021-12-310000783325wec:WisparkLLCMember2023-01-012023-12-310000783325wec:WisparkLLCMember2022-01-012022-12-310000783325wec:WisconsinEnergyCapitalCorporationMembersrt:ParentCompanyMemberwec:SupportAgreementRelatedToWECCDebtMember2023-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310000783325srt:ParentCompanyMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310000783325srt:ParentCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310000783325srt:ParentCompanyMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-310000783325srt:ParentCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-310000783325srt:ParentCompanyMemberwec:CommodityTransactionsGuaranteeMember2023-12-310000783325srt:ParentCompanyMemberus-gaap:StandbyLettersOfCreditMember2023-12-310000783325srt:ParentCompanyMemberus-gaap:SuretyBondMember2023-12-310000783325srt:ParentCompanyMemberus-gaap:GuaranteeTypeOtherMember2023-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMember2023-12-310000783325srt:ParentCompanyMemberwec:BluewaterMember2023-12-310000783325srt:ParentCompanyMemberwec:UpperMichiganEnergyResourcesCorporationMember2023-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMember2023-01-012023-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMember2022-01-012022-12-310000783325srt:ParentCompanyMemberwec:WECInfrastructureLLCMember2021-01-012021-12-310000783325srt:ParentCompanyMemberwec:UpperMichiganEnergyResourcesCorporationMember2023-12-310000783325srt:ParentCompanyMemberwec:UpperMichiganEnergyResourcesCorporationMember2022-12-310000783325srt:ParentCompanyMemberwec:WisparkLLCMember2023-12-310000783325srt:ParentCompanyMemberwec:WisparkLLCMember2022-12-310000783325srt:ParentCompanyMemberwec:BluewaterMember2023-12-310000783325srt:ParentCompanyMemberwec:BluewaterMember2022-12-310000783325srt:ParentCompanyMemberwec:IntegrysHoldingIncMember2023-12-310000783325srt:ParentCompanyMemberwec:IntegrysHoldingIncMember2022-12-310000783325wec:WisconsinEnergyCapitalCorporationMembersrt:ParentCompanyMember2023-12-310000783325wec:WisconsinEnergyCapitalCorporationMembersrt:ParentCompanyMember2022-12-310000783325srt:ParentCompanyMemberwec:WBSMember2023-12-310000783325srt:ParentCompanyMemberwec:WBSMember2022-12-31
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM 10-K
(Mark One)
| | | | | |
☒ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
For the fiscal year ended December 31, 2023
OR
| | | | | |
☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
For the transition period from ________________ to ___________________
| | | | | | | | | | | | | | |
Commission File Number | | Registrant; State of Incorporation; Address; and Telephone Number | | IRS Employer Identification No. |
| | | | |
001-09057 | | WEC ENERGY GROUP, INC. | | 39-1391525 |
(A Wisconsin Corporation)
231 West Michigan Street
P.O. Box 1331
Milwaukee, WI 53201
(414) 221-2345
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, $.01 Par Value | | WEC | | New York Stock Exchange |
Securities registered pursuant to Section 12(g) of the Act:
None
Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.
Yes ☒ No ☐
Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.
Yes ☐ No ☒
Indicate by check mark whether the 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.
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 (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).
Yes ☒ No ☐
Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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.
| | | | | | | | | | | | | | | | | | | | |
| Large accelerated filer | ☒ | | Accelerated filer | ☐ | |
| Non-accelerated filer | ☐ | | Smaller reporting company | ☐ |
| | | | Emerging growth company | ☐ |
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 the registrant has filed a report on and attestation to its management’s assessment of
the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C.
7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒
If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐
Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐
Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
Yes ☐ No ☒
The aggregate market value of the common stock of WEC Energy Group, Inc. held by non-affiliates was $27.8 billion based upon the reported closing price of such securities as of June 30, 2023.
Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the latest practicable date (January 31, 2024):
Common Stock, $.01 par value, 315,561,510 shares outstanding
Documents incorporated by reference:
Portions of WEC Energy Group, Inc.'s Definitive Proxy Statement on Schedule 14A for its Annual Meeting of Shareholders, to be held on May 9, 2024, are incorporated by reference into Part III hereof.
WEC ENERGY GROUP, INC.
ANNUAL REPORT ON FORM 10-K
For the Year Ended December 31, 2023
TABLE OF CONTENTS
| | | | | | | | |
2023 Form 10-K | i | WEC Energy Group, Inc. |
| | | | | | | | |
2023 Form 10-K | ii | WEC Energy Group, Inc. |
GLOSSARY OF TERMS AND ABBREVIATIONS
The abbreviations and terms set forth below are used throughout this report and have the meanings assigned to them below:
| | | | | | | | |
Subsidiaries and Affiliates | | |
ATC | | American Transmission Company LLC |
ATC Holdco | | ATC Holdco LLC |
ATC Holding | | ATC Holding LLC |
Bishop Hill III | | Bishop Hill Energy III LLC |
Blooming Grove | | Blooming Grove Wind Energy Center LLC |
Bluewater | | Bluewater Natural Gas Holding, LLC |
Bluewater Gas Storage | | Bluewater Gas Storage, LLC |
Coyote Ridge | | Coyote Ridge Wind, LLC |
Integrys | | Integrys Holding, Inc. |
Jayhawk | | Jayhawk Wind, LLC |
MERC | | Minnesota Energy Resources Corporation |
MGU | | Michigan Gas Utilities Corporation |
NSG | | North Shore Gas Company |
PDL | | WPS Power Development, LLC |
PELLC | | Peoples Energy, LLC |
PGL | | The Peoples Gas Light and Coke Company |
Samson I | | Samson I Solar Energy Center LLC |
Sapphire Sky | | Sapphire Sky Wind Energy LLC |
Tatanka Ridge | | Tatanka Ridge Wind, LLC |
Thunderhead | | Thunderhead Wind Energy LLC |
UMERC | | Upper Michigan Energy Resources Corporation |
Upstream | | Upstream Wind Energy LLC |
WBS | | WEC Business Services LLC |
WE | | Wisconsin Electric Power Company |
We Power | | W.E. Power, LLC |
WEC Energy Group | | WEC Energy Group, Inc. |
WECC | | Wisconsin Energy Capital Corporation |
WECI | | WEC Infrastructure LLC |
WECI Wind Holding I | | WEC Infrastructure Wind Holding I LLC |
WECI Wind Holding II | | WEC Infrastructure Wind Holding II LLC |
WEPCo Environmental Trust | | WEPCo Environmental Trust Finance I, LLC |
WG | | Wisconsin Gas LLC |
Wispark | | Wispark LLC |
Wisvest | | Wisvest LLC |
WPS | | Wisconsin Public Service Corporation |
WRPC | | Wisconsin River Power Company |
| | |
Federal and State Regulatory Agencies |
Army Corps | | United States Army Corps of Engineers |
CBP | | United States Customs and Border Protection Agency |
DOC | | United States Department of Commerce |
EPA | | United States Environmental Protection Agency |
FERC | | Federal Energy Regulatory Commission |
ICC | | Illinois Commerce Commission |
IRS | | United States Internal Revenue Service |
MPSC | | Michigan Public Service Commission |
MPUC | | Minnesota Public Utilities Commission |
PSCW | | Public Service Commission of Wisconsin |
SEC | | Securities and Exchange Commission |
WDNR | | Wisconsin Department of Natural Resources |
| | |
| | |
| | | | | | | | |
2023 Form 10-K | iii | WEC Energy Group, Inc. |
| | | | | | | | |
Accounting Terms |
AFUDC | | Allowance for Funds Used During Construction |
ARO | | Asset Retirement Obligation |
ASC | | Accounting Standards Codification |
ASU | | Accounting Standards Update |
CWIP | | Construction Work in Progress |
FASB | | Financial Accounting Standards Board |
GAAP | | Generally Accepted Accounting Principles |
LIFO | | Last-In, First-Out |
OPEB | | Other Postretirement Employee Benefits |
VIE | | Variable Interest Entity |
| | |
Environmental Terms |
Act 141 | | 2005 Wisconsin Act 141 |
BATW | | Bottom Ash Transport Water |
BTA | | Best Technology Available |
CAA | | Clean Air Act |
CASAC | | Clean Air Scientific Advisory Committee |
CCR | | Coal Combustion Residual |
CO2 | | Carbon Dioxide |
CWA | | Clean Water Act |
ELG | | Steam Electric Effluent Limitation Guidelines |
FGD | | Flue Gas Desulfurization |
GHG | | Greenhouse Gas |
LDC | | Local Natural Gas Distribution Company |
MATS | | Mercury and Air Toxics Standards |
NAAQS | | National Ambient Air Quality Standards |
NOV | | Notice of Violation |
NOx | | Nitrogen Oxide |
NSPS | | New Source Performance Standards |
PCB | | Polychlorinated Biphenyl |
PM | | Particulate Matter |
SO2 | | Sulfur Dioxide |
WOTUS | | Waters of the United States |
WPDES | | Wisconsin Pollutant Discharge Elimination System |
ZLD | | Zero Liquid Discharge |
| | |
Measurements | | |
Bcf | | Billion Cubic Feet |
Dth | | Dekatherm |
lb/MMBtu | | Pound Per Million British Thermal Unit |
MDth | | One Thousand Dekatherms |
MW | | Megawatt |
MWh | | Megawatt-hour |
µg/m3 | | Micrograms Per Cubic Meter |
| | |
Other Terms and Abbreviations |
2007 Junior Notes | | WEC Energy Group, Inc.'s 2007 Junior Subordinated Notes Due 2067 |
AMI | | Advanced Metering Infrastructure |
AOC | | Audit and Oversight Committee of the Board of Directors |
ARR | | Auction Revenue Right |
Badger Hollow I | | Badger Hollow Solar Park I |
Badger Hollow II | | Badger Hollow Solar Park II |
CABO | | Clean and Affordable Buildings Ordinance |
CAO | | Chief Administrative Officer |
| | |
CEO | | Chief Executive Officer |
CFR | | Code of Federal Regulations |
| | | | | | | | |
2023 Form 10-K | iv | WEC Energy Group, Inc. |
| | | | | | | | |
Chicago, IL-IN-WI | | Chicago, Illinois, Indiana, and Wisconsin |
| | |
Compensation Committee | | Compensation Committee of the Board of Directors |
CSIRT | | Cybersecurity Incident Response Team |
| | |
D.C. Circuit Court of Appeals | | United States Court of Appeals for the District of Columbia Circuit |
Darien | | Darien Solar Park |
DER | | Distributed Energy Resource |
DRER | | Dedicated Renewable Energy Resource |
Enterprise Security Director | | Director of Enterprise Security & Compliance |
| | |
ERGS | | Elm Road Generating Station |
ER 1 | | Elm Road Generating Station Unit 1 |
ER 2 | | Elm Road Generating Station Unit 2 |
ERSC | | Enterprise Risk Steering Committee |
ESG Progress Plan | | WEC Energy Group's Capital Investment Plan for Efficiency, Sustainability, and Growth for 2024-2028 |
ETB | | Environmental Trust Bond |
EV | | Electric Vehicle |
Exchange Act | | Securities Exchange Act of 1934, as amended |
Executive Order 13990 | | Executive Order 13990 of January 20, 2021 - Protecting Public Health and the Environment and Restoring Science To Tackle the Climate Crisis |
Forward Wind | | Forward Wind Energy Center |
FTR | | Financial Transmission Right |
GCRM | | Gas Cost Recovery Mechanism |
High Noon | | High Noon Solar Energy Center |
Holding Company Act | | Wisconsin Utility Holding Company Act |
IRA | | Inflation Reduction Act |
IT/OT | | Information Technology and Operational Technology |
ITC | | Investment Tax Credit |
Koshkonong | | Koshkonong Solar Park |
LIBOR | | London Interbank Offered Rate |
LMP | | Locational Marginal Price |
LNG | | Liquefied Natural Gas |
Maple Flats | | Maple Flats Solar Energy Center |
MG&E | | Madison Gas and Electric Company |
MISO | | Midcontinent Independent System Operator, Inc. |
MISO Energy Markets | | MISO Energy and Operating Reserves Market |
MRP | | Main Replacement Program |
NYMEX | | New York Mercantile Exchange |
OCPP | | Oak Creek Power Plant |
Omnibus Stock Incentive Plan | | WEC Energy Group Omnibus Stock Incentive Plan, Amended and Restated, Effective as of May 6, 2021 |
Paris | | Paris Solar-Battery Park |
PHMSA | | Pipeline and Hazardous Materials Safety Administration |
PIPP | | Presque Isle Power Plant |
Point Beach | | Point Beach Nuclear Power Plant |
PPA | | Power Purchase Agreement |
PSB | | Public Service Building |
PTC | | Production Tax Credit |
PUHCA 2005 | | Public Utility Holding Company Act of 2005 |
PWGS | | Port Washington Generating Station |
PWGS 1 | | Port Washington Generating Station Unit 1 |
PWGS 2 | | Port Washington Generating Station Unit 2 |
QIP | | Qualifying Infrastructure Plant |
RCC | | Replacement Capital Covenant (dated May 11, 2007) |
REC | | Renewable Energy Certificate |
Red Barn | | Red Barn Wind Park |
Renegade | | Renegade Solar Energy Center |
RICE | | Reciprocating Internal Combustion Engine |
| | | | | | | | |
2023 Form 10-K | v | WEC Energy Group, Inc. |
| | | | | | | | |
RNG | | Renewable Natural Gas |
ROE | | Return on Equity |
RTO | | Regional Transmission Organization |
S&P | | Standard & Poor's |
SIP | | State Implementation Plan |
SMP | | Safety Modernization Program |
SOFR | | Secured Overnight Financing Rate |
| | |
SPP | | Southwest Power Pool, Inc. |
SSR | | System Support Resource |
Supreme Court | | United States Supreme Court |
Tax Legislation | | Tax Cuts and Jobs Act of 2017 |
TCR | | Transmission Congestion Right |
Tilden | | Tilden Mining Company |
TPTFA | | Third-Party Transaction Fee Adjustment |
Two Creeks | | Two Creeks Solar Park |
UEA | | Uncollectible Expense Adjustment |
UFLPA | | Uyghur Forced Labor Prevention Act |
VAPP | | Valley Power Plant |
West Riverside | | West Riverside Energy Center |
Whitewater | | Whitewater Cogeneration Facility |
WPL | | Wisconsin Power and Light Company |
WRO | | Withhold Release Order |
WUA | | Wisconsin Utilities Association |
| | | | | | | | |
2023 Form 10-K | vi | WEC Energy Group, Inc. |
CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION
In this report, we make statements concerning our expectations, beliefs, plans, objectives, goals, strategies, and future events or performance. These statements are "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act. Readers are cautioned not to place undue reliance on these forward-looking statements. Forward-looking statements may be identified by reference to a future period or periods or by the use of terms such as "anticipates," "believes," "could," "estimates," "expects," "forecasts," "goals," "guidance," "intends," "may," "objectives," "plans," "possible," "potential," "projects," "seeks," "should," "targets," "will," or variations of these terms.
Forward-looking statements include, among other things, statements concerning management's expectations and projections regarding earnings, completion of capital projects, sales and customer growth, rate actions and related filings with regulatory authorities, environmental and other regulations, including associated compliance costs, legal proceedings, dividend payout ratios, effective tax rates, pension and OPEB plans, fuel costs, sources of electric energy supply, coal and natural gas deliveries, remediation costs, climate-related matters, our ESG Progress Plan, liquidity and capital resources, and other matters.
Forward-looking statements are subject to a number of risks and uncertainties that could cause our actual results to differ materially from those expressed or implied in the statements. These risks and uncertainties include those described in Item 1A. Risk Factors and those identified below:
•Factors affecting utility and non-utility energy infrastructure operations such as catastrophic weather-related damage, environmental incidents, unplanned facility outages and repairs and maintenance, and electric transmission or natural gas pipeline system constraints;
•Factors affecting the demand for electricity and natural gas, including political or regulatory developments, varying, adverse, or unusually severe weather conditions, including those caused by climate change, changes in economic conditions, customer growth and declines, commodity prices, energy conservation efforts, and continued adoption of distributed generation by customers;
•The timing, resolution, and impact of rate cases and negotiations, including recovery of deferred and current costs and the ability to earn a reasonable return on investment, and other regulatory decisions impacting our regulated operations;
•The impact of federal, state, and local legislative and/or regulatory changes, including changes in rate-setting policies or procedures, the results of recent rate orders, deregulation and restructuring of the electric and/or natural gas utility industries, transmission or distribution system operation, the approval process for new construction, reliability standards, pipeline integrity and safety standards, allocation of energy assistance, energy efficiency mandates, electrification initiatives and other efforts to reduce the use of natural gas, and tax laws, including those that affect our ability to use PTCs and ITCs, as well as changes in the interpretation and/or enforcement of any laws or regulations by regulatory agencies;
•Federal, state, and local legislative and regulatory changes relating to the environment, including climate change and other environmental regulations impacting generation facilities and renewable energy standards, the enforcement of these laws and regulations, changes in the interpretation of regulations or permit conditions by regulatory agencies, and the recovery of associated remediation and compliance costs;
•The ability to obtain and retain customers, including wholesale customers, due to increased competition in our electric and natural gas markets from retail choice and alternative electric suppliers, and continued industry consolidation;
•The timely completion of capital projects within budgets and the ability to recover the related costs through rates;
•The impact of changing expectations and demands of our customers, regulators, investors, and other stakeholders, including focus on environmental, social, and governance concerns;
•The risk of delays and shortages, and increased costs of equipment, materials, or other resources that are critical to our business operations and corporate strategy, as a result of supply chain disruptions (including disruptions from rail congestion), inflation, and other factors;
| | | | | | | | |
2023 Form 10-K | 1 | WEC Energy Group, Inc. |
•The impact of public health crises, including epidemics and pandemics, on our business functions, financial condition, liquidity, and results of operations;
•Factors affecting the implementation of our CO2 emission and/or methane emission reduction goals and opportunities and actions related to those goals, including related regulatory decisions, the cost of materials, supplies, and labor, technology advances, the feasibility of competing generation projects, and our ability to execute our capital plan;
•The financial and operational feasibility of taking more aggressive action to further reduce GHG emissions in order to limit future global temperature increases;
•The risks associated with inflation and changing commodity prices, including natural gas and electricity;
•The availability and cost of sources of natural gas and other fossil fuels, purchased power, materials needed to operate environmental controls at our electric generating facilities, or water supply due to high demand, shortages, transportation problems, nonperformance by electric energy or natural gas suppliers under existing power purchase or natural gas supply contracts, or other developments;
•Any impacts on the global economy, including from sanctions, and impacts on supply chains and fuel prices, generally, from ongoing, expanding, or escalating regional conflicts, including those in Ukraine, Israel, and parts of the Middle East;
•Changes in credit ratings, interest rates, and our ability to access the capital markets, caused by volatility in the global credit markets, our capitalization structure, and market perceptions of the utility industry, us, or any of our subsidiaries;
•Costs and effects of litigation, administrative proceedings, investigations, settlements, claims, and inquiries;
•The direct or indirect effect on our business resulting from terrorist or other physical attacks and cybersecurity intrusions, as well as the threat of such incidents, including the failure to maintain the security of personally identifiable information, the associated costs to protect our utility assets, technology systems, and personal information, and the costs to notify affected persons to mitigate their information security concerns and to comply with state notification laws;
•Restrictions imposed by various financing arrangements and regulatory requirements on the ability of our subsidiaries to transfer funds to us in the form of cash dividends, loans or advances, that could prevent us from paying our common stock dividends, taxes, and other expenses, and meeting our debt obligations;
•The risk of financial loss, including increases in bad debt expense, associated with the inability of our customers, counterparties, and affiliates to meet their obligations;
•Changes in the creditworthiness of the counterparties with whom we have contractual arrangements, including participants in the energy trading markets and fuel suppliers and transporters;
•The financial performance of ATC and its corresponding contribution to our earnings;
•The investment performance of our employee benefit plan assets, as well as unanticipated changes in related actuarial assumptions, which could impact future funding requirements;
•Factors affecting the employee workforce, including loss of key personnel, internal restructuring, work stoppages, and collective bargaining agreements and negotiations with union employees;
•Advances in technology, and related legislation or regulation supporting the use of that technology, that result in competitive disadvantages and create the potential for impairment of existing assets;
•Risks related to our non-utility renewable energy facilities, including unfavorable weather, changes in the financial performance and/or creditworthiness of counterparties to the off-take agreements, changes in demand based on lower prices for alternative energy sources, the ability to replace expiring PPAs under acceptable terms, risks of rights related to property on which our projects are located but we do not own, the availability of reliable interconnection and electricity grids, and exposure to the rules and procedures of the power markets in which these facilities are located;
| | | | | | | | |
2023 Form 10-K | 2 | WEC Energy Group, Inc. |
•The risk associated with the values of goodwill and other long-lived assets, including intangible assets, and equity method investments, including the current impairment of capital costs in Illinois; and possible future impairments of other assets;
•Potential business strategies to acquire and dispose of assets or businesses, or portions thereof, which cannot be ass