0000783325--12-312020Q3false.330.250.500.5000007833252020-01-012020-09-30xbrli:shares00007833252020-09-30iso4217:USD00007833252020-07-012020-09-3000007833252019-07-012019-09-3000007833252019-01-012019-09-30iso4217:USDxbrli:shares00007833252019-12-310000783325wec:UpstreamWindEnergyLLCMember2019-01-012019-01-3100007833252018-12-3100007833252019-09-300000783325us-gaap:CommonStockMember2019-12-310000783325us-gaap:AdditionalPaidInCapitalMember2019-12-310000783325us-gaap:RetainedEarningsMember2019-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000783325us-gaap:ParentMember2019-12-310000783325us-gaap:PreferredStockMember2019-12-310000783325us-gaap:NoncontrollingInterestMember2019-12-310000783325us-gaap:CommonStockMember2020-01-012020-03-310000783325us-gaap:AdditionalPaidInCapitalMember2020-01-012020-03-310000783325us-gaap:RetainedEarningsMember2020-01-012020-03-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-03-310000783325us-gaap:ParentMember2020-01-012020-03-310000783325us-gaap:PreferredStockMember2020-01-012020-03-310000783325us-gaap:NoncontrollingInterestMember2020-01-012020-03-3100007833252020-01-012020-03-310000783325us-gaap:CommonStockMember2020-03-310000783325us-gaap:AdditionalPaidInCapitalMember2020-03-310000783325us-gaap:RetainedEarningsMember2020-03-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-03-310000783325us-gaap:ParentMember2020-03-310000783325us-gaap:PreferredStockMember2020-03-310000783325us-gaap:NoncontrollingInterestMember2020-03-3100007833252020-03-310000783325us-gaap:CommonStockMember2020-04-012020-06-300000783325us-gaap:AdditionalPaidInCapitalMember2020-04-012020-06-300000783325us-gaap:RetainedEarningsMember2020-04-012020-06-300000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-04-012020-06-300000783325us-gaap:ParentMember2020-04-012020-06-300000783325us-gaap:PreferredStockMember2020-04-012020-06-300000783325us-gaap:NoncontrollingInterestMember2020-04-012020-06-3000007833252020-04-012020-06-300000783325us-gaap:CommonStockMember2020-06-300000783325us-gaap:AdditionalPaidInCapitalMember2020-06-300000783325us-gaap:RetainedEarningsMember2020-06-300000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-300000783325us-gaap:ParentMember2020-06-300000783325us-gaap:PreferredStockMember2020-06-300000783325us-gaap:NoncontrollingInterestMember2020-06-3000007833252020-06-300000783325us-gaap:CommonStockMember2020-07-012020-09-300000783325us-gaap:AdditionalPaidInCapitalMember2020-07-012020-09-300000783325us-gaap:RetainedEarningsMember2020-07-012020-09-300000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000783325us-gaap:ParentMember2020-07-012020-09-300000783325us-gaap:PreferredStockMember2020-07-012020-09-300000783325us-gaap:NoncontrollingInterestMember2020-07-012020-09-300000783325us-gaap:CommonStockMember2020-09-300000783325us-gaap:AdditionalPaidInCapitalMember2020-09-300000783325us-gaap:RetainedEarningsMember2020-09-300000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-09-300000783325us-gaap:ParentMember2020-09-300000783325us-gaap:PreferredStockMember2020-09-300000783325us-gaap:NoncontrollingInterestMember2020-09-300000783325us-gaap:CommonStockMember2018-12-310000783325us-gaap:AdditionalPaidInCapitalMember2018-12-310000783325us-gaap:RetainedEarningsMember2018-12-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310000783325us-gaap:ParentMember2018-12-310000783325us-gaap:PreferredStockMember2018-12-310000783325us-gaap:NoncontrollingInterestMember2018-12-310000783325us-gaap:CommonStockMember2019-01-012019-03-310000783325us-gaap:AdditionalPaidInCapitalMember2019-01-012019-03-310000783325us-gaap:RetainedEarningsMember2019-01-012019-03-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-03-310000783325us-gaap:ParentMember2019-01-012019-03-310000783325us-gaap:PreferredStockMember2019-01-012019-03-310000783325us-gaap:NoncontrollingInterestMember2019-01-012019-03-3100007833252019-01-012019-03-310000783325us-gaap:CommonStockMember2019-03-310000783325us-gaap:AdditionalPaidInCapitalMember2019-03-310000783325us-gaap:RetainedEarningsMember2019-03-310000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-03-310000783325us-gaap:ParentMember2019-03-310000783325us-gaap:PreferredStockMember2019-03-310000783325us-gaap:NoncontrollingInterestMember2019-03-3100007833252019-03-310000783325us-gaap:CommonStockMember2019-04-012019-06-300000783325us-gaap:AdditionalPaidInCapitalMember2019-04-012019-06-300000783325us-gaap:RetainedEarningsMember2019-04-012019-06-300000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-04-012019-06-300000783325us-gaap:ParentMember2019-04-012019-06-300000783325us-gaap:PreferredStockMember2019-04-012019-06-300000783325us-gaap:NoncontrollingInterestMember2019-04-012019-06-3000007833252019-04-012019-06-300000783325us-gaap:CommonStockMember2019-06-300000783325us-gaap:AdditionalPaidInCapitalMember2019-06-300000783325us-gaap:RetainedEarningsMember2019-06-300000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-06-300000783325us-gaap:ParentMember2019-06-300000783325us-gaap:PreferredStockMember2019-06-300000783325us-gaap:NoncontrollingInterestMember2019-06-3000007833252019-06-300000783325us-gaap:CommonStockMember2019-07-012019-09-300000783325us-gaap:AdditionalPaidInCapitalMember2019-07-012019-09-300000783325us-gaap:RetainedEarningsMember2019-07-012019-09-300000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-07-012019-09-300000783325us-gaap:ParentMember2019-07-012019-09-300000783325us-gaap:PreferredStockMember2019-07-012019-09-300000783325us-gaap:NoncontrollingInterestMember2019-07-012019-09-300000783325us-gaap:CommonStockMember2019-09-300000783325us-gaap:AdditionalPaidInCapitalMember2019-09-300000783325us-gaap:RetainedEarningsMember2019-09-300000783325us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-09-300000783325us-gaap:ParentMember2019-09-300000783325us-gaap:PreferredStockMember2019-09-300000783325us-gaap:NoncontrollingInterestMember2019-09-30wec:customer0000783325us-gaap:ElectricityUsRegulatedMember2020-09-300000783325us-gaap:NaturalGasUsRegulatedMember2020-09-30xbrli:pure0000783325wec:TransmissionAffiliateMember2020-09-300000783325wec:TatankaRidgeWindLLCMemberwec:WECInfrastructureLLCMember2020-07-28utr:MW0000783325wec:WECInfrastructureLLCMemberwec:ThunderheadWindEnergyLLCMember2019-08-310000783325wec:WECInfrastructureLLCMemberwec:ThunderheadWindEnergyLLCMember2020-02-190000783325wec:WECInfrastructureLLCMemberwec:ThunderheadWindEnergyLLCMember2019-08-012019-08-310000783325wec:WECInfrastructureLLCMemberwec:UpstreamWindEnergyCenterMember2019-01-310000783325wec:WECInfrastructureLLCMemberwec:UpstreamWindEnergyCenterMember2019-01-012019-01-310000783325wec:WECInfrastructureLLCMemberwec:UpstreamWindEnergyCenterMember2020-04-300000783325wec:WECInfrastructureLLCMemberwec:UpstreamWindEnergyCenterMember2020-01-012020-09-300000783325wec:BloomingGroveWindEnergyCenterMemberwec:WECInfrastructureLLCMember2020-01-270000783325wec:BloomingGroveWindEnergyCenterMemberwec:WECInfrastructureLLCMember2020-02-19wec:solar_projects00007833252019-06-012019-06-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:ElectricityUsRegulatedMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:ElectricityUsRegulatedMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325srt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:IllinoisMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325srt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:WisconsinMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325wec:IllinoisMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325wec:OtherStatesMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325wec:PublicUtilityMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325us-gaap:CorporateAndOtherMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325srt:ConsolidationEliminationsMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325wec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325wec:WisconsinMember2020-07-012020-09-300000783325wec:IllinoisMember2020-07-012020-09-300000783325wec:OtherStatesMember2020-07-012020-09-300000783325wec:PublicUtilityMember2020-07-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMember2020-07-012020-09-300000783325us-gaap:CorporateAndOtherMember2020-07-012020-09-300000783325srt:ConsolidationEliminationsMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:ElectricityUsRegulatedMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:ElectricityUsRegulatedMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325srt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:IllinoisMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325srt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:WisconsinMemberwec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325wec:IllinoisMemberwec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325wec:OtherStatesMemberwec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325wec:PublicUtilityMemberwec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325us-gaap:CorporateAndOtherMemberwec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325srt:ConsolidationEliminationsMemberwec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325wec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325wec:WisconsinMember2019-07-012019-09-300000783325wec:IllinoisMember2019-07-012019-09-300000783325wec:OtherStatesMember2019-07-012019-09-300000783325wec:PublicUtilityMember2019-07-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMember2019-07-012019-09-300000783325us-gaap:CorporateAndOtherMember2019-07-012019-09-300000783325srt:ConsolidationEliminationsMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:ElectricityUsRegulatedMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:ElectricityUsRegulatedMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325srt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:IllinoisMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325srt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:WisconsinMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325wec:IllinoisMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325wec:OtherStatesMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325wec:PublicUtilityMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325us-gaap:CorporateAndOtherMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325srt:ConsolidationEliminationsMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325wec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325wec:WisconsinMember2020-01-012020-09-300000783325wec:IllinoisMember2020-01-012020-09-300000783325wec:OtherStatesMember2020-01-012020-09-300000783325wec:PublicUtilityMember2020-01-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMember2020-01-012020-09-300000783325us-gaap:CorporateAndOtherMember2020-01-012020-09-300000783325srt:ConsolidationEliminationsMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:ElectricityUsRegulatedMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:ElectricityUsRegulatedMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325srt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberus-gaap:PublicUtilitiesMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:IllinoisMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMembersrt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:CorporateAndOtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325srt:ConsolidationEliminationsMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:WisconsinMemberwec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325wec:IllinoisMemberwec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325wec:OtherStatesMemberwec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325wec:PublicUtilityMemberwec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325us-gaap:CorporateAndOtherMemberwec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325srt:ConsolidationEliminationsMemberwec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325wec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325wec:WisconsinMember2019-01-012019-09-300000783325wec:IllinoisMember2019-01-012019-09-300000783325wec:OtherStatesMember2019-01-012019-09-300000783325wec:PublicUtilityMember2019-01-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMember2019-01-012019-09-300000783325us-gaap:CorporateAndOtherMember2019-01-012019-09-300000783325srt:ConsolidationEliminationsMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:SmallcommercialandindustrialMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:SmallcommercialandindustrialMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:SmallcommercialandindustrialMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMemberwec:SmallcommercialandindustrialMember2019-01-012019-09-300000783325wec:LargecommercialandindustrialcustomersMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:LargecommercialandindustrialcustomersMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:LargecommercialandindustrialcustomersMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:LargecommercialandindustrialcustomersMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OtherretailcustomerMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OtherretailcustomerMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OtherretailcustomerMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OtherretailcustomerMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberwec:WholesalecustomerMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberwec:WholesalecustomerMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberwec:WholesalecustomerMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberwec:WholesalecustomerMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:ResaleCustomersMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:ResaleCustomersMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:ResaleCustomersMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:ResaleCustomersMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:DowntownMilwaukeeSteamCustomersMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:DowntownMilwaukeeSteamCustomersMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:DowntownMilwaukeeSteamCustomersMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:DowntownMilwaukeeSteamCustomersMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:WisconsinMemberus-gaap:ElectricityUsRegulatedMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:CommercialandIndustrialCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:CommercialandIndustrialCustomerMemberwec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-07-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:CommercialandIndustrialCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:CommercialandIndustrialCustomerMemberwec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-07-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:CommercialandIndustrialCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:CommercialandIndustrialCustomerMemberwec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2020-01-012020-09-300000783325us-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:ResidentialcustomerMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:CommercialandIndustrialCustomerMemberwec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:CommercialandIndustrialCustomerMemberwec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:CommercialandIndustrialCustomerMemberus-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:TotalRetailCustomersMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberus-gaap:RevenueFromContractWithCustomerMemberwec:TransportationcustomersMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:OtherutilityMemberwec:WisconsinMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:TransferredOverTimeMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:TransferredOverTimeMemberwec:PublicUtilityMemberwec:OtherutilityMemberus-gaap:RevenueFromContractWithCustomerMemberus-gaap:NaturalGasUsRegulatedMember2019-01-012019-09-300000783325us-gaap:AlternativeEnergyMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325us-gaap:AlternativeEnergyMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325us-gaap:AlternativeEnergyMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325us-gaap:AlternativeEnergyMemberwec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:WePowerrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:WePowerrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:WePowerrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:WePowerrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325naics:ZZ811412wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325naics:ZZ811412wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325naics:ZZ811412wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325naics:ZZ811412wec:OthernonutilityrevenuesMemberus-gaap:TransferredOverTimeMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:DistributedrenewablesolarprojectrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:DistributedrenewablesolarprojectrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:DistributedrenewablesolarprojectrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:DistributedrenewablesolarprojectrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:OtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:OtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:OthernonutilityrevenuesMemberwec:OtherMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:OthernonutilityrevenuesMemberwec:OtherMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OthernonutilityrevenuesMember2020-01-012020-09-300000783325wec:WePowerrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2020-07-012020-09-300000783325wec:WePowerrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2020-01-012020-09-300000783325wec:WePowerrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2019-07-012019-09-300000783325wec:WePowerrevenuesMemberus-gaap:RevenueFromContractWithCustomerMember2019-01-012019-09-300000783325wec:OtheroperatingrevenuesMemberwec:LatepaymentchargesMember2020-07-012020-09-300000783325wec:OtheroperatingrevenuesMemberwec:LatepaymentchargesMember2019-07-012019-09-300000783325wec:OtheroperatingrevenuesMemberwec:LatepaymentchargesMember2020-01-012020-09-300000783325wec:OtheroperatingrevenuesMemberwec:LatepaymentchargesMember2019-01-012019-09-300000783325wec:OtheroperatingrevenuesMemberwec:AlternativerevenuesutilityMember2020-07-012020-09-300000783325wec:OtheroperatingrevenuesMemberwec:AlternativerevenuesutilityMember2019-07-012019-09-300000783325wec:OtheroperatingrevenuesMemberwec:AlternativerevenuesutilityMember2020-01-012020-09-300000783325wec:OtheroperatingrevenuesMemberwec:AlternativerevenuesutilityMember2019-01-012019-09-300000783325wec:LeasesMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325wec:LeasesMemberwec:OtheroperatingrevenuesMember2019-07-012019-09-300000783325wec:LeasesMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325wec:LeasesMemberwec:OtheroperatingrevenuesMember2019-01-012019-09-300000783325wec:LatePaymentChargesTransferredToAlternativeRevenuesMemberwec:OtheroperatingrevenuesMember2020-07-012020-09-300000783325wec:LatePaymentChargesTransferredToAlternativeRevenuesMemberwec:OtheroperatingrevenuesMember2020-01-012020-09-300000783325wec:COVID19Member2020-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMember2020-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2020-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMember2020-09-300000783325us-gaap:PublicUtilitiesMember2020-09-300000783325wec:NonUtilityEnergyInfrastructureMember2020-09-300000783325us-gaap:CorporateAndOtherMember2020-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMember2020-06-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2020-06-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMember2020-06-300000783325us-gaap:PublicUtilitiesMember2020-06-300000783325us-gaap:CorporateAndOtherMember2020-06-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMember2019-12-310000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2019-12-310000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMember2019-12-310000783325us-gaap:PublicUtilitiesMember2019-12-310000783325us-gaap:CorporateAndOtherMember2019-12-310000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMember2020-01-012020-09-300000783325us-gaap:PensionAndOtherPostretirementPlansCostsMember2020-09-300000783325us-gaap:PensionAndOtherPostretirementPlansCostsMember2019-12-310000783325us-gaap:StrandedCostsMember2020-09-300000783325us-gaap:StrandedCostsMember2019-12-310000783325us-gaap:EnvironmentalRestorationCostsMember2020-09-300000783325us-gaap:EnvironmentalRestorationCostsMember2019-12-310000783325us-gaap:DeferredIncomeTaxChargesMember2020-09-300000783325us-gaap:DeferredIncomeTaxChargesMember2019-12-310000783325us-gaap:AssetRetirementObligationCostsMember2020-09-300000783325us-gaap:AssetRetirementObligationCostsMember2019-12-310000783325wec:SystemSupportResourceMember2020-09-300000783325wec:SystemSupportResourceMember2019-12-310000783325wec:UncollectibleExpenseMember2020-09-300000783325wec:UncollectibleExpenseMember2019-12-310000783325wec:COVID19Member2020-09-300000783325wec:COVID19Member2019-12-310000783325us-gaap:DeferredDerivativeGainLossMember2020-09-300000783325us-gaap:DeferredDerivativeGainLossMember2019-12-310000783325wec:WePowerGenerationMember2020-09-300000783325wec:WePowerGenerationMember2019-12-310000783325us-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-09-300000783325us-gaap:OtherRegulatoryAssetsLiabilitiesMember2019-12-310000783325us-gaap:DeferredIncomeTaxChargesMember2020-09-300000783325us-gaap:DeferredIncomeTaxChargesMember2019-12-310000783325us-gaap:RemovalCostsMember2020-09-300000783325us-gaap:RemovalCostsMember2019-12-310000783325us-gaap:PensionAndOtherPostretirementPlansCostsMember2020-09-300000783325us-gaap:PensionAndOtherPostretirementPlansCostsMember2019-12-310000783325wec:EnergyCostsRefundableThroughRateAdjustmentsMember2020-09-300000783325wec:EnergyCostsRefundableThroughRateAdjustmentsMember2019-12-310000783325wec:ElectricTransmissionCostsMember2020-09-300000783325wec:ElectricTransmissionCostsMember2019-12-310000783325us-gaap:DeferredDerivativeGainLossMember2020-09-300000783325us-gaap:DeferredDerivativeGainLossMember2019-12-310000783325wec:UncollectibleExpenseMember2020-09-300000783325wec:UncollectibleExpenseMember2019-12-310000783325wec:EarningsSharingMechanismsMember2020-09-300000783325wec:EarningsSharingMechanismsMember2019-12-310000783325wec:DecouplingMember2020-09-300000783325wec:DecouplingMember2019-12-310000783325wec:EnergyEfficiencyProgramCostsMember2020-09-300000783325wec:EnergyEfficiencyProgramCostsMember2019-12-310000783325us-gaap:OtherRegulatoryAssetsLiabilitiesMember2020-09-300000783325us-gaap:OtherRegulatoryAssetsLiabilitiesMember2019-12-310000783325us-gaap:EmployeeStockOptionMember2020-01-012020-09-300000783325us-gaap:RestrictedStockMember2020-01-012020-09-300000783325us-gaap:PerformanceSharesMember2020-01-012020-09-300000783325us-gaap:SubsequentEventMember2020-10-012020-12-310000783325us-gaap:CommercialPaperMember2020-09-300000783325us-gaap:CommercialPaperMember2019-12-310000783325us-gaap:NotesPayableOtherPayablesMember2020-09-300000783325us-gaap:NotesPayableOtherPayablesMember2019-12-310000783325us-gaap:CommercialPaperMember2020-01-012020-09-300000783325us-gaap:NotesPayableOtherPayablesMember2020-03-302020-03-300000783325us-gaap:NotesPayableOtherPayablesMember2020-01-012020-09-300000783325us-gaap:LineOfCreditMembersrt:ParentCompanyMember2020-09-300000783325srt:ParentCompanyMemberus-gaap:RevolvingCreditFacilityMember2020-09-300000783325wec:WisconsinElectricPowerCompanyMemberus-gaap:RevolvingCreditFacilityMember2020-09-300000783325wec:WisconsinPublicServiceCorporationMemberus-gaap:RevolvingCreditFacilityMember2020-09-300000783325us-gaap:RevolvingCreditFacilityMemberwec:WisconsinGasLLCMember2020-09-300000783325us-gaap:RevolvingCreditFacilityMemberwec:ThePeoplesGasLightAndCokeCompanyMember2020-09-300000783325srt:ParentCompanyMemberwec:WECSeniorNotes245Member2020-05-152020-05-150000783325srt:ParentCompanyMemberwec:WECSeniorNotes245Member2020-05-150000783325srt:ParentCompanyMemberwec:WECSeniorNotes55DueSeptember152023Member2020-09-172020-09-170000783325srt:ParentCompanyMemberwec:WECSeniorNotes55DueSeptember152023Member2020-09-170000783325wec:WECSeniorNotes1375DueOctober152027Membersrt:ParentCompanyMemberus-gaap:SubsequentEventMember2020-10-092020-10-090000783325wec:WECSeniorNotes1375DueOctober152027Membersrt:ParentCompanyMemberus-gaap:SubsequentEventMember2020-10-090000783325srt:ParentCompanyMemberwec:WECSeniorNotes180DueOctober152030Memberus-gaap:SubsequentEventMember2020-10-092020-10-090000783325srt:ParentCompanyMemberwec:WECSeniorNotes180DueOctober152030Memberus-gaap:SubsequentEventMember2020-10-090000783325srt:ParentCompanyMemberwec:WECSeniorNotes3375DueJune152021Memberus-gaap:SubsequentEventMember2020-10-092020-10-090000783325srt:ParentCompanyMemberwec:WECSeniorNotes3375DueJune152021Memberus-gaap:SubsequentEventMember2020-10-090000783325wec:WECSeniorNotes31DueMarch82022Membersrt:ParentCompanyMemberus-gaap:SubsequentEventMember2020-10-092020-10-090000783325wec:WECSeniorNotes31DueMarch82022Membersrt:ParentCompanyMemberus-gaap:SubsequentEventMember2020-10-090000783325us-gaap:SubsequentEventMember2020-10-092020-10-090000783325wec:PGLSeriesWWBondsSecured1875Due2023Memberwec:ThePeoplesGasLightAndCokeCompanyMember2020-08-012020-08-010000783325wec:PGLSeriesWWBondsSecured1875Due2023Memberwec:ThePeoplesGasLightAndCokeCompanyMember2020-08-010000783325wec:MERCSeniorNotes2.69dueMay12025Memberwec:MinnesotaEnergyResourcesCorporationMember2020-04-292020-04-290000783325wec:MERCSeniorNotes2.69dueMay12025Memberwec:MinnesotaEnergyResourcesCorporationMember2020-04-290000783325wec:MGUMemberwec:MGUSeniorNotes2.69dueMay12025Member2020-04-292020-04-290000783325wec:MGUMemberwec:MGUSeniorNotes2.69dueMay12025Member2020-04-290000783325wec:BadgerHollowSolarFarmIIMember2020-09-30utr:acre0000783325wec:ElectricRateRequestMemberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Member2019-12-012019-12-310000783325wec:TaxCutsAndJobsActOf2017Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Member2019-12-012019-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwec:CommodityContractNaturalGasMember2020-09-300000783325us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2020-09-300000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2020-09-300000783325us-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2020-09-300000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwec:CommodityContractFinancialTransmissionRightsMember2020-09-300000783325us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractFinancialTransmissionRightsMember2020-09-300000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractFinancialTransmissionRightsMember2020-09-300000783325us-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractFinancialTransmissionRightsMember2020-09-300000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300000783325us-gaap:CoalContractMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000783325us-gaap:CoalContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300000783325us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-09-300000783325us-gaap:FairValueMeasurementsRecurringMember2020-09-300000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:InterestRateSwapMember2020-09-300000783325us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2020-09-300000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2020-09-300000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2020-09-300000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwec:CommodityContractNaturalGasMember2019-12-310000783325us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2019-12-310000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2019-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractNaturalGasMember2019-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwec:CommodityContractFinancialTransmissionRightsMember2019-12-310000783325us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractFinancialTransmissionRightsMember2019-12-310000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractFinancialTransmissionRightsMember2019-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberwec:CommodityContractFinancialTransmissionRightsMember2019-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2019-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000783325us-gaap:CoalContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2019-12-310000783325us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000783325us-gaap:FairValueMeasurementsRecurringMember2019-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:InterestRateSwapMember2019-12-310000783325us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2019-12-310000783325us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2019-12-310000783325us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2019-12-310000783325us-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-300000783325us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300000783325us-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000783325us-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000783325wec:CommodityContractNaturalGasMember2020-09-300000783325wec:CommodityContractNaturalGasMember2019-12-310000783325wec:CommodityContractFinancialTransmissionRightsMember2020-09-300000783325wec:CommodityContractFinancialTransmissionRightsMember2019-12-310000783325us-gaap:CoalContractMember2020-09-300000783325us-gaap:CoalContractMember2019-12-310000783325us-gaap:InterestRateSwapMember2020-09-300000783325us-gaap:InterestRateSwapMember2019-12-31utr:MMBTU0000783325wec:CommodityContractNaturalGasMember2020-07-012020-09-300000783325wec:CommodityContractNaturalGasMember2019-07-012019-09-30utr:MWh0000783325wec:CommodityContractFinancialTransmissionRightsMember2020-07-012020-09-300000783325wec:CommodityContractFinancialTransmissionRightsMember2019-07-012019-09-300000783325wec:CommodityContractNaturalGasMember2020-01-012020-09-300000783325wec:CommodityContractNaturalGasMember2019-01-012019-09-300000783325wec:CommodityContractFinancialTransmissionRightsMember2020-01-012020-09-300000783325wec:CommodityContractFinancialTransmissionRightsMember2019-01-012019-09-30wec:number_of_interest_rate_swaps0000783325srt:ParentCompanyMemberus-gaap:InterestRateSwapMember2020-09-300000783325srt:ParentCompanyMemberwec:WECEnergyGroupJuniorNotesDue2067Member2020-09-300000783325srt:ParentCompanyMemberus-gaap:InterestRateSwapMember2020-07-012020-09-300000783325srt:ParentCompanyMemberus-gaap:InterestRateSwapMember2019-07-012019-09-300000783325srt:ParentCompanyMemberus-gaap:InterestRateSwapMember2020-01-012020-09-300000783325srt:ParentCompanyMemberus-gaap:InterestRateSwapMember2019-01-012019-09-300000783325wec:CommodityTransactionsGuaranteeMember2020-09-300000783325us-gaap:StandbyLettersOfCreditMember2020-09-300000783325us-gaap:SuretyBondMember2020-09-300000783325us-gaap:GuaranteeTypeOtherMember2020-09-300000783325wec:BluewaterMemberwec:CommodityTransactionsGuaranteeMember2020-09-300000783325wec:CommodityTransactionsGuaranteeMemberwec:UpperMichiganEnergyResourcesCorporationMember2020-09-300000783325wec:WECInfrastructureLLCMemberwec:CommodityTransactionsGuaranteeMember2020-09-300000783325us-gaap:IndemnificationGuaranteeMember2020-09-300000783325us-gaap:PensionPlansDefinedBenefitMember2020-07-012020-09-300000783325us-gaap:PensionPlansDefinedBenefitMember2019-07-012019-09-300000783325us-gaap:PensionPlansDefinedBenefitMember2020-01-012020-09-300000783325us-gaap:PensionPlansDefinedBenefitMember2019-01-012019-09-300000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-07-012020-09-300000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-07-012019-09-300000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-09-300000783325us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-09-300000783325us-gaap:PensionPlansDefinedBenefitMember2020-09-300000783325wec:WisconsinSegmentMember2020-09-300000783325wec:IllinoisMember2020-09-300000783325wec:OtherStatesMember2020-09-300000783325wec:ATCHoldcoLLCMember2020-09-300000783325wec:TransmissionAffiliateMember2020-06-300000783325wec:ATCHoldcoLLCMember2020-06-300000783325wec:TransmissionAffiliateMember2020-07-012020-09-300000783325wec:ATCHoldcoLLCMember2020-07-012020-09-300000783325wec:TransmissionAffiliateMember2019-06-300000783325wec:ATCHoldcoLLCMember2019-06-300000783325wec:TransmissionAffiliateMember2019-07-012019-09-300000783325wec:ATCHoldcoLLCMember2019-07-012019-09-300000783325wec:TransmissionAffiliateMember2019-09-300000783325wec:ATCHoldcoLLCMember2019-09-300000783325wec:TransmissionAffiliateMember2019-12-310000783325wec:ATCHoldcoLLCMember2019-12-310000783325wec:TransmissionAffiliateMember2020-01-012020-09-300000783325wec:ATCHoldcoLLCMember2020-01-012020-09-300000783325wec:TransmissionAffiliateMember2018-12-310000783325wec:ATCHoldcoLLCMember2018-12-310000783325wec:TransmissionAffiliateMember2019-01-012019-09-300000783325wec:ATCHoldcoLLCMember2019-01-012019-09-300000783325wec:WisconsinPublicServiceCorporationMember2020-09-30wec:segment0000783325wec:ElectricTransmissionSegmentMemberwec:AmericanTransmissionCompanyLLCMember2020-09-300000783325wec:ElectricTransmissionSegmentMemberwec:ATCHoldcoLLCMember2020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:BishopHillIIIWindEnergyCenterMember2020-09-300000783325wec:CoyoteRidgeWindLLCMemberwec:NonUtilityEnergyInfrastructureMember2020-09-300000783325wec:UpstreamWindEnergyCenterMemberwec:NonUtilityEnergyInfrastructureMember2020-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:ExternalRevenuesMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2020-07-012020-09-300000783325wec:ElectricTransmissionSegmentMemberwec:ExternalRevenuesMember2020-07-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:ExternalRevenuesMember2020-07-012020-09-300000783325wec:ExternalRevenuesMemberus-gaap:CorporateAndOtherMember2020-07-012020-09-300000783325wec:ExternalRevenuesMemberus-gaap:IntersegmentEliminationMember2020-07-012020-09-300000783325wec:ExternalRevenuesMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:IntersegmentTransactionsMember2020-07-012020-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2020-07-012020-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2020-07-012020-09-300000783325wec:ElectricTransmissionSegmentMemberwec:IntersegmentTransactionsMember2020-07-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:IntersegmentTransactionsMember2020-07-012020-09-300000783325us-gaap:CorporateAndOtherMemberwec:IntersegmentTransactionsMember2020-07-012020-09-300000783325us-gaap:IntersegmentEliminationMemberwec:IntersegmentTransactionsMember2020-07-012020-09-300000783325wec:IntersegmentTransactionsMember2020-07-012020-09-300000783325wec:ElectricTransmissionSegmentMember2020-07-012020-09-300000783325us-gaap:IntersegmentEliminationMember2020-07-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:ExternalRevenuesMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2019-07-012019-09-300000783325wec:ElectricTransmissionSegmentMemberwec:ExternalRevenuesMember2019-07-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:ExternalRevenuesMember2019-07-012019-09-300000783325wec:ExternalRevenuesMemberus-gaap:CorporateAndOtherMember2019-07-012019-09-300000783325wec:ExternalRevenuesMemberus-gaap:IntersegmentEliminationMember2019-07-012019-09-300000783325wec:ExternalRevenuesMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:IntersegmentTransactionsMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2019-07-012019-09-300000783325wec:ElectricTransmissionSegmentMemberwec:IntersegmentTransactionsMember2019-07-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:IntersegmentTransactionsMember2019-07-012019-09-300000783325us-gaap:CorporateAndOtherMemberwec:IntersegmentTransactionsMember2019-07-012019-09-300000783325us-gaap:IntersegmentEliminationMemberwec:IntersegmentTransactionsMember2019-07-012019-09-300000783325wec:IntersegmentTransactionsMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMember2019-07-012019-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2019-07-012019-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMember2019-07-012019-09-300000783325wec:ElectricTransmissionSegmentMember2019-07-012019-09-300000783325us-gaap:IntersegmentEliminationMember2019-07-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:ExternalRevenuesMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2020-01-012020-09-300000783325wec:ElectricTransmissionSegmentMemberwec:ExternalRevenuesMember2020-01-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:ExternalRevenuesMember2020-01-012020-09-300000783325wec:ExternalRevenuesMemberus-gaap:CorporateAndOtherMember2020-01-012020-09-300000783325wec:ExternalRevenuesMemberus-gaap:IntersegmentEliminationMember2020-01-012020-09-300000783325wec:ExternalRevenuesMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:IntersegmentTransactionsMember2020-01-012020-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2020-01-012020-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2020-01-012020-09-300000783325wec:ElectricTransmissionSegmentMemberwec:IntersegmentTransactionsMember2020-01-012020-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:IntersegmentTransactionsMember2020-01-012020-09-300000783325us-gaap:CorporateAndOtherMemberwec:IntersegmentTransactionsMember2020-01-012020-09-300000783325us-gaap:IntersegmentEliminationMemberwec:IntersegmentTransactionsMember2020-01-012020-09-300000783325wec:IntersegmentTransactionsMember2020-01-012020-09-300000783325wec:ElectricTransmissionSegmentMember2020-01-012020-09-300000783325us-gaap:IntersegmentEliminationMember2020-01-012020-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:ExternalRevenuesMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:ExternalRevenuesMember2019-01-012019-09-300000783325wec:ElectricTransmissionSegmentMemberwec:ExternalRevenuesMember2019-01-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:ExternalRevenuesMember2019-01-012019-09-300000783325wec:ExternalRevenuesMemberus-gaap:CorporateAndOtherMember2019-01-012019-09-300000783325wec:ExternalRevenuesMemberus-gaap:IntersegmentEliminationMember2019-01-012019-09-300000783325wec:ExternalRevenuesMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMemberwec:IntersegmentTransactionsMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:IntersegmentTransactionsMember2019-01-012019-09-300000783325wec:ElectricTransmissionSegmentMemberwec:IntersegmentTransactionsMember2019-01-012019-09-300000783325wec:NonUtilityEnergyInfrastructureMemberwec:IntersegmentTransactionsMember2019-01-012019-09-300000783325us-gaap:CorporateAndOtherMemberwec:IntersegmentTransactionsMember2019-01-012019-09-300000783325us-gaap:IntersegmentEliminationMemberwec:IntersegmentTransactionsMember2019-01-012019-09-300000783325wec:IntersegmentTransactionsMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMemberwec:WisconsinMember2019-01-012019-09-300000783325wec:IllinoisMemberus-gaap:PublicUtilitiesMember2019-01-012019-09-300000783325wec:OtherStatesMemberus-gaap:PublicUtilitiesMember2019-01-012019-09-300000783325us-gaap:PublicUtilitiesMember2019-01-012019-09-300000783325wec:ElectricTransmissionSegmentMember2019-01-012019-09-300000783325us-gaap:IntersegmentEliminationMember2019-01-012019-09-300000783325wec:AmericanTransmissionCompanyLLCMember2020-09-300000783325wec:AmericanTransmissionCompanyLLCMember2019-12-310000783325wec:ATCHoldcoLLCMember2020-09-300000783325wec:ATCHoldcoLLCMember2019-12-310000783325wec:PowerPurchaseAgreementMember2020-09-300000783325wec:PowerPurchaseAgreementMember2020-01-012020-09-30wec:numberOfRevisions0000783325wec:MercuryandAirToxicsMemberus-gaap:ElectricityUsRegulatedMember2020-05-012020-05-31wec:States0000783325wec:ClimateChangeMemberus-gaap:ElectricityUsRegulatedMember2020-01-012020-09-300000783325wec:ClimateChangeMemberus-gaap:ElectricityUsRegulatedMember2018-01-012019-03-310000783325wec:ClimateChangeMember2020-01-012020-09-300000783325wec:ClimateChangeMemberus-gaap:ElectricityUsRegulatedMember2019-01-012019-12-310000783325wec:ClimateChangeMemberus-gaap:NaturalGasUsRegulatedMember2020-09-30wec:generating_units0000783325wec:SteamElectricEffluentGuidelinesMemberus-gaap:ElectricityUsRegulatedMember2020-09-300000783325wec:SteamElectricEffluentGuidelinesMemberus-gaap:ElectricityUsRegulatedMember2020-01-012020-09-300000783325srt:MaximumMemberwec:SteamElectricEffluentGuidelinesMemberus-gaap:ElectricityUsRegulatedMember2020-01-012020-09-300000783325wec:ManufacturedGasPlantRemediationMemberus-gaap:EnvironmentalRestorationCostsMemberus-gaap:NaturalGasUsRegulatedMember2020-09-300000783325wec:ManufacturedGasPlantRemediationMemberus-gaap:EnvironmentalRestorationCostsMemberus-gaap:NaturalGasUsRegulatedMember2019-12-310000783325wec:ManufacturedGasPlantRemediationMemberus-gaap:NaturalGasUsRegulatedMember2020-09-300000783325wec:ManufacturedGasPlantRemediationMemberus-gaap:NaturalGasUsRegulatedMember2019-12-31wec:order0000783325wec:PublicServiceCommissionOfWisconsinPSCWMember2020-03-242020-03-240000783325wec:COVID19Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2020-09-300000783325wec:IllinoisCommerceCommissionICCMember2020-06-182020-06-180000783325wec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2020-06-182020-06-180000783325wec:IllinoisCommerceCommissionICCMemberwec:NSGMember2020-06-182020-06-180000783325wec:IllinoisCommerceCommissionICCMemberwec:COVID19Member2020-06-182020-06-180000783325wec:IllinoisCommerceCommissionICCMemberwec:COVID19Member2020-09-300000783325wec:MinnesotaPublicUtilitiesCommissionMPUCMember2020-06-182020-06-18wec:utility0000783325wec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Member2019-12-012019-12-310000783325wec:Rates2020Memberwec:ElectricRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:WisconsinPublicServiceCorporationMemberwec:ElectricRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:WisconsinPublicServiceCorporationMemberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinGasLLCMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:SteamRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Memberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:WisconsinPublicServiceCorporationMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Member2019-12-012019-12-310000783325wec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Memberwec:WisconsinGasLLCMember2019-12-012019-12-310000783325wec:Rates2021Memberwec:ElectricRateRequestMemberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:ElectricRateRequestMemberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:WisconsinPublicServiceCorporationMemberwec:ElectricRateRequestMemberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:WisconsinPublicServiceCorporationMemberwec:Rates2021Memberwec:ElectricRateRequestMemberwec:TaxCutsAndJobsActOf2017Memberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:WisconsinPublicServiceCorporationMemberwec:ElectricRateRequestMemberwec:EarningsSharingMechanismsMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Member2019-12-012019-12-310000783325wec:Rates2020Memberwec:TaxCutsAndJobsActOf2017Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:Rates2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:WisconsinPublicServiceCorporationMemberwec:TaxCutsAndJobsActOf2017Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:WisconsinPublicServiceCorporationMemberwec:Rates2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-12-012019-12-310000783325wec:Rates2021Memberwec:TaxCutsAndJobsActOf2017Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinGasLLCMember2019-12-012019-12-310000783325wec:Rates2020Memberwec:TaxCutsAndJobsActOf2017Memberwec:NaturalGasRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinGasLLCMember2019-12-012019-12-310000783325wec:ElectricRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Memberwec:WisconsinElectricPowerCompanyMember2019-12-012019-12-310000783325wec:WisconsinPublicServiceCorporationMemberwec:ElectricRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Member2017-09-012017-09-300000783325wec:WisconsinPublicServiceCorporationMemberwec:ElectricRateRequestMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Member2019-12-012019-12-310000783325wec:WisconsinPublicServiceCorporationMemberwec:ElectricRateRequestMemberwec:ReACTMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rates2020and2021Member2019-12-012019-12-310000783325wec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rate2018And2019Memberwec:WisconsinElectricPowerCompanyMember2017-09-012017-09-300000783325wec:WisconsinPublicServiceCorporationMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rate2018And2019Member2017-09-012017-09-300000783325wec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rate2018And2019Memberwec:WisconsinGasLLCMember2017-09-012017-09-300000783325wec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rate2018And2019Memberwec:WisconsinElectricPowerCompanyMember2018-01-012019-12-310000783325wec:PublicServiceCommissionOfWisconsinPSCWMemberwec:Rate2018And2019Member2017-09-012017-09-30utr:Bcf0000783325wec:LiquefiedNaturalGasFacilitiesMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMember2019-11-010000783325wec:LiquefiedNaturalGasFacilitiesMemberwec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinGasLLCMember2019-11-010000783325wec:LiquefiedNaturalGasFacilitiesMemberwec:PublicServiceCommissionOfWisconsinPSCWMember2019-11-010000783325wec:PublicServiceCommissionOfWisconsinPSCWMemberwec:WisconsinElectricPowerCompanyMemberwec:BadgerHollowSolarFarmIIMember2020-03-010000783325wec:IllinoisCommerceCommissionICCMemberwec:NSGMemberus-gaap:SubsequentEventMember2020-10-152020-10-15wec:Assurance0000783325wec:IllinoisCommerceCommissionICCMemberwec:ThePeoplesGasLightAndCokeCompanyMember2020-09-300000783325wec:MGUMemberwec:MichiganPublicServiceCommissionMPSCMember2020-07-01

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

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

Commission File Number

Registrant; State of Incorporation; Address; and Telephone Number

IRS Employer Identification No.

001-09057

WEC ENERGY GROUP, INC.

39-1391525

Title of Each Class

Trading Symbol(s)

Name of Each Exchange on Which Registered

Common Stock, $.01 Par Value

WEC

New York Stock Exchange

    Yes ☒    No ☐

    Yes ☒    No ☐

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. ☐

    Yes ☐    No ☒

Page

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

1

PART I.

FINANCIAL INFORMATION

3

ITEM 1.

FINANCIAL STATEMENTS (UNAUDITED)

3

Condensed Consolidated Income Statements

3

Condensed Consolidated Statements of Comprehensive Income

4

Condensed Consolidated Balance Sheets

5

Condensed Consolidated Statements of Cash Flows

6

Condensed Consolidated Statements of Equity

7

Notes to Condensed Consolidated Financial Statements

9

Page

Note 1

General Information

9

Note 2

Acquisitions

9

Note 3

Disposition

10

Note 4

Operating Revenues

11

Note 5

Credit Losses

14

Note 6

Regulatory Assets and Liabilities

16

Note 7

Property, Plant, and Equipment

17

Note 8

Common Equity

17

Note 9

Short-Term Debt and Lines of Credit

18

Note 10

Long-Term Debt

18

Note 11

Leases

19

Note 12

Materials, Supplies, and Inventories

20

Note 13

Income Taxes

20

Note 14

Fair Value Measurements

21

Note 15

Derivative Instruments

23

Note 16

Guarantees

25

Note 17

Employee Benefits

26

Note 18

Goodwill

26

Note 19

Investment in Transmission Affiliates

27

Note 20

Segment Information

28

Note 21

Variable Interest Entities

31

Note 22

Commitments and Contingencies

31

Note 23

Supplemental Cash Flow Information

35

Note 24

Regulatory Environment

35

Note 25

New Accounting Pronouncements

40

ITEM 2.

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

41

ITEM 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

74

ITEM 4.

CONTROLS AND PROCEDURES

74

PART II.

OTHER INFORMATION

75

ITEM 1.

LEGAL PROCEEDINGS

75

ITEM 1A.

RISK FACTORS

75

ITEM 6.

EXHIBITS

77

SIGNATURE

78

Subsidiaries and Affiliates
ATC						American Transmission Company LLC
ATC Holdco						ATC Holdco LLC
Bishop Hill III						Bishop Hill Energy III LLC
Bluewater						Bluewater Natural Gas Holding, LLC
Coyote Ridge						Coyote Ridge Wind, LLC
Integrys						Integrys Holding, Inc.
MERC						Minnesota Energy Resources Corporation
MGU						Michigan Gas Utilities Corporation
NSG						North Shore Gas Company
PDL						WPS Power Development, LLC
PGL						The Peoples Gas Light and Coke Company
UMERC						Upper Michigan Energy Resources Corporation
Upstream						Upstream Wind Energy LLC
WE						Wisconsin Electric Power Company
We Power						W.E. Power, LLC
WEC Energy Group						WEC Energy Group, Inc.
WECI						WEC Infrastructure LLC
WG						Wisconsin Gas LLC
WPS						Wisconsin Public Service Corporation
Federal and State Regulatory Agencies
EPA						United States Environmental Protection Agency
FERC						Federal Energy Regulatory Commission
ICC						Illinois Commerce Commission
IEPA						Illinois Environmental Protection Agency
MPSC						Michigan Public Service Commission
MPUC						Minnesota Public Utilities Commission
PSCW						Public Service Commission of Wisconsin
SEC						United States Securities and Exchange Commission
Accounting Terms
AFUDC						Allowance for Funds Used During Construction
ASU						Accounting Standards Update
FASB						Financial Accounting Standards Board
GAAP						United States Generally Accepted Accounting Principles
LIFO						Last-In, First-Out
OPEB						Other Postretirement Employee Benefits
Environmental Terms
ACE						Affordable Clean Energy
BATW						Bottom Ash Transport Water
BSER						Best System of Emission Reduction
BTA						Best Technology Available
CAA						Clean Air Act
CO2						Carbon Dioxide
ELG						Steam Electric Effluent Limitation Guidelines
FGD						Flue Gas Desulfurization
GHG						Greenhouse Gas
GMZ						Groundwater Management Zone

MATS						Mercury and Air Toxics Standards
NOV						Notice of Violation
RTR						Risk and Technology Review
The Combustion Turbine Rule						National Emission Standards for Hazardous Air Pollutants for Stationary Combustion Turbines
VN						Violation Notice
Measurements
Dth						Dekatherm
MW						Megawatt
MWh						Megawatt-hour
Other Terms and Abbreviations
2007 Junior Notes						WEC Energy Group, Inc.'s 2007 Junior Subordinated Notes Due 2067
AG						Attorney General
AMI						Advanced Metering Infrastructure
Badger Hollow I						Badger Hollow Solar Park I
Badger Hollow II						Badger Hollow Solar Park II
Blooming Grove						Blooming Grove Wind Energy Center LLC
CDC						Centers for Disease Control and Prevention
COVID-19						Coronavirus Disease – 2019
D.C. Circuit Court of Appeals						United States Court of Appeals for the District of Columbia Circuit
ERGS						Elm Road Generating Station
Exchange Act						Securities Exchange Act of 1934, as amended
FTR						Financial Transmission Right
GUIC						Gas Utility Infrastructure Cost
LIBOR						London Interbank Offered Rate
LNG						Liquefied Natural Gas
MISO						Midcontinent Independent System Operator, Inc.
OCPP						Oak Creek Power Plant
OC 5						Oak Creek Power Plant Unit 5
OC 6						Oak Creek Power Plant Unit 6
OC 7						Oak Creek Power Plant Unit 7
OC 8						Oak Creek Power Plant Unit 8
PIPP						Presque Isle Power Plant
QIP						Qualifying Infrastructure Plant
ROE						Return on Equity
SMP						Natural Gas System Modernization Program
SPC						COVID-19 Special Purpose Charge
SSR						System Support Resource
Tatanka Ridge						Tatanka Ridge Wind LLC
Tax Legislation						Tax Cuts and Jobs Act of 2017
Thunderhead						Thunderhead Wind Energy LLC
Tilden						Tilden Mining Company
Two Creeks						Two Creeks Solar Park
WHO						World Health Organization

•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, and the feasibility of competing generation projects;

CONDENSED CONSOLIDATED INCOME STATEMENTS (Unaudited)						Three Months Ended												Nine Months Ended
						September 30												September 30
(in millions, except per share amounts)						2020						2019						2020						2019
Operating revenues						$	1,651.0					$	1,608.0					$	5,308.3					$	5,575.6
Operating expenses
Cost of sales						482.8						484.3						1,662.0						1,985.8
Other operation and maintenance						498.7						529.2						1,427.5						1,583.4
Depreciation and amortization						245.0						233.8						726.6						690.1
Property and revenue taxes						54.3						49.8						156.6						148.0
Total operating expenses						1,280.8						1,297.1						3,972.7						4,407.3
Operating income						370.2						310.9						1,335.6						1,168.3
Equity in earnings of transmission affiliates						40.1						38.7						132.8						111.7
Other income, net						25.7						21.8						59.9						76.3
Interest expense						122.0						125.8						375.8						374.3
Other expense						(56.2)						(65.3)						(183.1)						(186.3)
Income before income taxes						314.0						245.6						1,152.5						982.0
Income tax expense						46.9						11.3						190.7						91.5
Net income						267.1						234.3						961.8						890.5
Preferred stock dividends of subsidiary						0.3						0.3						0.9						0.9
Net loss attributed to noncontrolling interests						—						0.3						—						0.5
Net income attributed to common shareholders						$	266.8					$	234.3					$	960.9					$	890.1
Earnings per share
Basic						$	0.85					$	0.74					$	3.05					$	2.82
Diluted						$	0.84					$	0.74					$	3.04					$	2.81
Weighted average common shares outstanding
Basic						315.4						315.4						315.4						315.4
Diluted						316.5						316.8						316.6						316.7

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)						Three Months Ended												Nine Months Ended
						September 30												September 30
(in millions)						2020						2019						2020						2019
Net income						$	267.1					$	234.3					$	961.8					$	890.5
Other comprehensive income (loss), net of tax
Derivatives accounted for as cash flow hedges
Net derivative losses, net of tax benefits of $0.0, $(0.2), $(1.6), and $(1.5), respectively						—						(0.3)						(4.2)						(3.8)
Reclassification of net loss (gains) to net income, net of tax						0.9						(0.2)						1.4						(0.8)
Cash flow hedges, net						0.9						(0.5)						(2.8)						(4.6)
Defined benefit plans
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax						—						—						0.5						0.1
Other comprehensive income (loss), net of tax						0.9						(0.5)						(2.3)						(4.5)
Comprehensive income						268.0						233.8						959.5						886.0
Preferred stock dividends of subsidiary						0.3						0.3						0.9						0.9
Comprehensive loss attributed to noncontrolling interests						—						0.3						—						0.5
Comprehensive income attributed to common shareholders						$	267.7					$	233.8					$	958.6					$	885.6

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (in millions, except share and per share amounts)						September 30, 2020						December 31, 2019
Assets
Current assets
Cash and cash equivalents						$	13.1					$	37.5
Accounts receivable and unbilled revenues, net of reserves of $173.3 and $140.0, respectively						911.8						1,176.5
Materials, supplies, and inventories						573.4						549.8
Prepayments						169.5						261.8
Other						59.4						68.0
Current assets						1,727.2						2,093.6
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $9,308.6 and $8,878.7, respectively						24,551.7						23,620.1
Regulatory assets						3,462.2						3,506.7
Equity investment in transmission affiliates						1,750.4						1,720.8
Goodwill						3,052.8						3,052.8
Other						877.7						957.8
Long-term assets						33,694.8						32,858.2
Total assets						$	35,422.0					$	34,951.8
Liabilities and Equity
Current liabilities
Short-term debt						$	771.0					$	830.8
Current portion of long-term debt						596.2						693.2
Accounts payable						751.3						908.1
Accrued payroll and benefits						173.9						199.8
Other						547.6						550.8
Current liabilities						2,840.0						3,182.7
Long-term liabilities
Long-term debt						11,652.5						11,211.0
Deferred income taxes						3,974.7						3,769.3
Deferred revenue, net						417.8						497.1
Regulatory liabilities						3,939.3						3,992.8
Environmental remediation liabilities						589.4						589.2
Pension and OPEB obligations						320.6						326.2
Other						1,128.6						1,128.9
Long-term liabilities						22,022.9						21,514.5
Commitments and contingencies (Note 22)
Common shareholders' equity
Common stock – $0.01 par value; 325,000,000 shares authorized; 315,434,531 shares outstanding						3.2						3.2
Additional paid in capital						4,163.8						4,186.6
Retained earnings						6,290.1						5,927.7
Accumulated other comprehensive loss						(6.4)						(4.1)
Common shareholders' equity						10,450.7						10,113.4
Preferred stock of subsidiary						30.4						30.4
Noncontrolling interests						78.0						110.8
Total liabilities and equity						$	35,422.0					$	34,951.8

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)						Nine Months Ended
						September 30
(in millions)						2020						2019
Operating activities
Net income						$	961.8					$	890.5
Reconciliation to cash provided by operating activities
Depreciation and amortization						726.6						690.1
Deferred income taxes and investment tax credits, net						152.5						58.8
Contributions and payments related to pension and OPEB plans						(10.1)						(12.1)
Equity income in transmission affiliates, net of distributions						(20.3)						(17.8)
Change in –
Accounts receivable and unbilled revenues, net						262.3						360.2
Materials, supplies, and inventories						(23.6)						(44.9)
Prepayments						92.3						90.7
Other current assets						37.2						19.7
Accounts payable						(178.9)						(192.3)
Other current liabilities						(23.3)						(1.8)
Other, net						(26.8)						(0.4)
Net cash provided by operating activities						1,949.7						1,840.7
Investing activities
Capital expenditures						(1,618.7)						(1,511.5)
Acquisition of Upstream, net of cash and restricted cash acquired of $9.2						—						(268.2)
Capital contributions to transmission affiliates						(15.2)						(37.3)
Proceeds from the sale of assets and businesses						9.8						32.2
Proceeds from the sale of investments held in rabbi trust						17.1						0.2
Reimbursement for ATC's construction costs						—						32.4
Insurance proceeds received for property damage						22.2						—
Proceeds from cash surrender value of life insurance						8.3						9.2
Other, net						13.4						8.5
Net cash used in investing activities						(1,563.1)						(1,734.5)
Financing activities
Exercise of stock options						23.3						66.1
Purchase of common stock						(56.7)						(138.2)
Dividends paid on common stock						(598.5)						(558.4)
Issuance of long-term debt						810.0						1,320.0
Retirement of long-term debt						(482.6)						(106.0)
Issuance of short-term loan						340.0						—
Change in other short-term debt						(399.8)						(753.7)
Purchase of additional ownership interest in Upstream from noncontrolling interest						(31.0)						—
Other, net						(12.4)						(15.5)
Net cash used in financing activities						(407.7)						(185.7)
Net change in cash, cash equivalents, and restricted cash						(21.1)						(79.5)
Cash, cash equivalents, and restricted cash at beginning of period						82.3						146.1
Cash, cash equivalents, and restricted cash at end of period						$	61.2					$	66.6

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited)
						WEC Energy Group Common Shareholders' Equity
(in millions, except per share amounts)						Common Stock						Additional Paid In Capital						Retained Earnings						Accumulated Other Comprehensive Loss						Total Common Shareholders' Equity						Preferred Stock of Subsidiary						Non-controlling Interests						Total Equity
Balance at December 31, 2019						$	3.2					$	4,186.6					$	5,927.7					$	(4.1)					$	10,113.4					$	30.4					$	110.8					$	10,254.6
Net income attributed to common shareholders						—						—						452.5						—						452.5						—						—						452.5
Net loss attributed to noncontrolling interests						—						—						—						—						—						—						(0.2)						(0.2)
Other comprehensive loss						—						—						—						(3.0)						(3.0)						—						—						(3.0)
Common stock dividends of $0.6325 per share						—						—						(199.5)						—						(199.5)						—						—						(199.5)
Exercise of stock options						—						16.0						—						—						16.0						—						—						16.0
Purchase of common stock						—						(40.4)						—						—						(40.4)						—						—						(40.4)
Distributions to noncontrolling interests						—						—						—						—						—						—						(0.5)						(0.5)
Stock-based compensation and other						—						5.1						—						—						5.1						—						—						5.1
Balance at March 31, 2020						$	3.2					$	4,167.3					$	6,180.7					$	(7.1)					$	10,344.1					$	30.4					$	110.1					$	10,484.6
Net income attributed to common shareholders						—						—						241.6						—						241.6						—						—						241.6
Net income attributed to noncontrolling interests						—						—						—						—						—						—						0.2						0.2
Other comprehensive loss						—						—						—						(0.2)						(0.2)						—						—						(0.2)
Common stock dividends of $0.6325 per share						—						—						(199.5)						—						(199.5)						—						—						(199.5)
Exercise of stock options						—						4.3						—						—						4.3						—						—						4.3
Purchase of common stock						—						(9.9)						—						—						(9.9)						—						—						(9.9)
Purchase of additional ownership interest in Upstream from noncontrolling interest						—						—						—						—						—						—						(31.0)						(31.0)
Distributions to noncontrolling interests						—						—						—						—						—						—						(0.7)						(0.7)
Stock-based compensation and other						—						3.3						—						—						3.3						—						—						3.3
Balance at June 30, 2020						$	3.2					$	4,165.0					$	6,222.8					$	(7.3)					$	10,383.7					$	30.4					$	78.6					$	10,492.7
Net income attributed to common shareholders						—						—						266.8						—						266.8						—						—						266.8
Other comprehensive income						—						—						—						0.9						0.9						—						—						0.9
Common stock dividends of $0.6325 per share						—						—						(199.5)						—						(199.5)						—						—						(199.5)
Exercise of stock options						—						3.0						—						—						3.0						—						—						3.0
Purchase of common stock						—						(6.4)						—						—						(6.4)						—						—						(6.4)
Distributions to noncontrolling interests						—						—						—						—						—						—						(0.6)						(0.6)
Stock-based compensation and other						—						2.2						—						—						2.2						—						—						2.2
Balance at September 30, 2020						$	3.2					$	4,163.8					$	6,290.1					$	(6.4)					$	10,450.7					$	30.4					$	78.0					$	10,559.1

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) (continued)
						WEC Energy Group Common Shareholders' Equity
(in millions, except per share amounts)						Common Stock						Additional Paid In Capital						Retained Earnings						Accumulated Other Comprehensive Loss						Total Common Shareholders' Equity						Preferred Stock of Subsidiary						Non-controlling Interests						Total Equity
Balance at December 31, 2018						$	3.2					$	4,250.1					$	5,538.2					$	(2.6)					$	9,788.9					$	30.4					$	23.4					$	9,842.7
Net income attributed to common shareholders						—						—						420.1						—						420.1						—						—						420.1
Other comprehensive loss						—						—						—						(1.4)						(1.4)						—						—						(1.4)
Common stock dividends of $0.59 per share						—						—						(186.2)						—						(186.2)						—						—						(186.2)
Exercise of stock options						—						32.6						—						—						32.6						—						—						32.6
Purchase of common stock						—						(70.7)						—						—						(70.7)						—						—						(70.7)
Acquisition of a noncontrolling interest						—						—						—						—						—						—						69.0						69.0
Capital contributions from noncontrolling interest						—						—						—						—						—						—						4.8						4.8
Stock-based compensation and other						—						1.2						—						—						1.2						—						—						1.2
Balance at March 31, 2019						$	3.2					$	4,213.2					$	5,772.1					$	(4.0)					$	9,984.5					$	30.4					$	97.2					$	10,112.1
Net income attributed to common shareholders						—						—						235.7						—						235.7						—						—						235.7
Net loss attributed to noncontrolling interests						—						—						—						—						—						—						(0.2)						(0.2)
Other comprehensive loss						—						—						—						(2.6)						(2.6)						—						—						(2.6)
Common stock dividends of $0.59 per share						—						—						(186.1)						—						(186.1)						—						—						(186.1)
Exercise of stock options						—						17.5						—						—						17.5						—						—						17.5
Purchase of common stock						—						(35.6)						—						—						(35.6)						—						—						(35.6)
Capital contributions from noncontrolling interest						—						—						—						—						—						—						5.5						5.5
Distributions to noncontrolling interests						—						—						—						—						—						—						(0.9)						(0.9)
Stock-based compensation and other						—						2.8						—						—						2.8						—						0.1						2.9
Balance at June 30, 2019						$	3.2					$	4,197.9					$	5,821.7					$	(6.6)					$	10,016.2					$	30.4					$	101.7					$	10,148.3
Net income attributed to common shareholders						—						—						234.3						—						234.3						—						—						234.3
Net loss attributed to noncontrolling interests						—						—						—						—						—						—						(0.3)						(0.3)
Other comprehensive loss						—						—						—						(0.5)						(0.5)						—						—						(0.5)
Common stock dividends of $0.59 per share						—						—						(186.1)						—						(186.1)						—						—						(186.1)
Exercise of stock options						—						16.0						—						—						16.0						—						—						16.0
Purchase of common stock						—						(31.9)						—						—						(31.9)						—						—						(31.9)
Capital contributions from noncontrolling interest						—						—						—						—						—						—						4.3						4.3
Distributions to noncontrolling interests						—						—						—						—						—						—						(0.6)						(0.6)
Stock-based compensation and other						—						3.0						—						—						3.0						—						(0.1)						2.9
Balance at September 30, 2019						$	3.2					$	4,185.0					$	5,869.9					$	(7.1)					$	10,051.0					$	30.4					$	105.0					$	10,186.4

(in millions)
Current assets						$	0.4
Net property, plant, and equipment						341.6
Other long-term assets						14.8
Current liabilities						(4.6)
Long-term liabilities						(15.0)
Noncontrolling interest						(69.0)
Total purchase price						$	268.2

(in millions)						Wisconsin						Illinois						Other States						Total Utility Operations						Non-Utility Energy Infrastructure						Corporate and Other						Reconciling Eliminations						WEC Energy Group Consolidated
Three Months Ended September 30, 2020
Electric						$	1,212.9					$	—					$	—					$	1,212.9					$	—					$	—					$	—					$	1,212.9
Natural gas						150.5						213.4						43.1						407.0						9.1						—						(8.3)						407.8
Total regulated revenues						1,363.4						213.4						43.1						1,619.9						9.1						—						(8.3)						1,620.7
Other non-utility revenues						—						0.1						4.2						4.3						14.7						0.5						(1.6)						17.9
Total revenues from contracts with customers						1,363.4						213.5						47.3						1,624.2						23.8						0.5						(9.9)						1,638.6
Other operating revenues						2.9						8.4						1.0						12.3						99.7						0.1						(99.7)						12.4
Total operating revenues						$	1,366.3					$	221.9					$	48.3					$	1,636.5					$	123.5					$	0.6					$	(109.6)					$	1,651.0

(in millions)						Wisconsin						Illinois						Other States						Total Utility Operations						Non-Utility Energy Infrastructure						Corporate and Other						Reconciling Eliminations						WEC Energy Group Consolidated
Three Months Ended September 30, 2019
Electric						$	1,185.4					$	—					$	—					$	1,185.4					$	—					$	—					$	—					$	1,185.4
Natural gas						151.1						190.0						43.8						384.9						8.9						—						(8.4)						385.4
Total regulated revenues						1,336.5						190.0						43.8						1,570.3						8.9						—						(8.4)						1,570.8
Other non-utility revenues						—						—						4.2						4.2						12.0						1.3						(0.7)						16.8
Total revenues from contracts with customers						1,336.5						190.0						48.0						1,574.5						20.9						1.3						(9.1)						1,587.6
Other operating revenues						2.8						8.0						0.9						11.7						98.5						—						(89.8)						20.4
Total operating revenues						$	1,339.3					$	198.0					$	48.9					$	1,586.2					$	119.4					$	1.3					$	(98.9)					$	1,608.0