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

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

FORM 10-Q

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

For the quarterly period ended September 30, 2020

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

For the transition period from ________________ to ___________________

Commission
File Number
Registrant; State of Incorporation;
Address; and Telephone Number
IRS Employer
Identification No.
WEC-20200930_G1.JPG
001-09057 WEC ENERGY GROUP, INC. 39-1391525
(A Wisconsin Corporation)
231 West Michigan Street
P.O. Box 1331
Milwaukee, WI 53201
(414) 221-2345


Securities registered pursuant to Section 12(b) of the Act:
Title of Each Class Trading Symbol(s) Name of Each Exchange on Which Registered
Common Stock, $.01 Par Value WEC New York Stock Exchange

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

    Yes     No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

    Yes     No




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

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

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

    Yes     No

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date (September 30, 2020):

Common Stock, $.01 Par Value, 315,434,531 shares outstanding


WEC ENERGY GROUP, INC.
QUARTERLY REPORT ON FORM 10-Q
For the Quarter Ended September 30, 2020
TABLE OF CONTENTS
Page
1
3
3
3
4
5
6
7
9
Page
9
9

09/30/2020 Form 10-Q
i
WEC Energy Group, Inc.

GLOSSARY OF TERMS AND ABBREVIATIONS

The abbreviations and terms set forth below are used throughout this report and have the meanings assigned to them below:
Subsidiaries and Affiliates
ATC American Transmission Company LLC
ATC Holdco ATC Holdco LLC
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
09/30/2020 Form 10-Q
ii
WEC Energy Group, Inc.

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

09/30/2020 Form 10-Q
iii
WEC Energy Group, Inc.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

In this report, we make statements concerning our expectations, beliefs, plans, objectives, goals, strategies, and future events or performance. These statements are "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act. Readers are cautioned not to place undue reliance on these forward-looking statements. Forward-looking statements may be identified by reference to a future period or periods or by the use of terms such as "anticipates," "believes," "could," "estimates," "expects," "forecasts," "goals," "guidance," "intends," "may," "objectives," "plans," "possible," "potential," "projects," "seeks," "should," "targets," "will," or variations of these terms.

Forward-looking statements include, among other things, statements concerning management's expectations and projections regarding earnings, completion of capital projects, sales and customer growth, rate actions and related filings with regulatory authorities, environmental and other regulations and associated compliance costs, legal proceedings, dividend payout ratios, effective tax rates, pension and OPEB plans, fuel costs, sources of electric energy supply, coal and natural gas deliveries, remediation costs, environmental matters, liquidity and capital resources, and other matters.

Forward-looking statements are subject to a number of risks and uncertainties that could cause our actual results to differ materially from those expressed or implied in the statements. These risks and uncertainties include those described in risk factors as set forth in this report and our 2019 Annual Report on Form 10-K, and those identified below:

Factors affecting utility operations such as catastrophic weather-related damage, environmental incidents, unplanned facility outages and repairs and maintenance, and electric transmission or natural gas pipeline system constraints;

Factors affecting the demand for electricity and natural gas, including political developments, unusual weather, changes in economic conditions, customer growth and declines, commodity prices, energy conservation efforts, and continued adoption of distributed generation by customers;

The timing, resolution, and impact of rate cases and negotiations, including recovery of deferred and current costs and the ability to earn a reasonable return on investment, and other regulatory decisions impacting our regulated operations;

The impact of the COVID-19 pandemic on our business functions, financial condition, liquidity, and results of operations;

The impact of recent and future federal, state, and local legislative and/or regulatory changes, including changes in rate-setting policies or procedures, deregulation and restructuring of the electric and/or natural gas utility industries, transmission or distribution system operation, the approval process for new construction, reliability standards, pipeline integrity and safety standards, allocation of energy assistance, energy efficiency mandates, and tax laws, including the Tax Legislation as well as those that affect our ability to use production tax credits and investment tax credits;

Federal and state legislative and regulatory changes relating to the environment, including climate change and other environmental regulations impacting generation facilities and renewable energy standards, the enforcement of these laws and regulations, changes in the interpretation of regulations or permit conditions by regulatory agencies, and the recovery of associated remediation and compliance costs;

The ability to obtain and retain customers, including wholesale customers, due to increased competition in our electric and natural gas markets from retail choice and alternative electric suppliers, and continued industry consolidation;

The timely completion of capital projects within budgets and the ability to recover the related costs through rates;

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;

The financial and operational feasibility of taking more aggressive action to further reduce GHG emissions in order to limit future global temperature increases;

The risks associated with changing commodity prices, particularly natural gas and electricity, and the availability of sources of natural gas and other fossil fuels, purchased power, materials needed to operate environmental controls at our electric
09/30/2020 Form 10-Q
1
WEC Energy Group, Inc.

generating facilities, or water supply due to high demand, shortages, transportation problems, nonperformance by electric energy or natural gas suppliers under existing power purchase or natural gas supply contracts, or other developments;

Changes in credit ratings, interest rates, and our ability to access the capital markets, caused by volatility in the global credit markets, our capitalization structure, and market perceptions of the utility industry, us, or any of our subsidiaries;

Changes in the method of determining LIBOR or the replacement of LIBOR with an alternative reference rate;

Costs and effects of litigation, administrative proceedings, investigations, settlements, claims, and inquiries;

The direct or indirect effect on our business resulting from terrorist attacks and cyber security intrusions, as well as the threat of such incidents, including the failure to maintain the security of personally identifiable information, the associated costs to protect our utility assets, technology systems, and personal information, and the costs to notify affected persons to mitigate their information security concerns and to comply with state notification laws;

Restrictions imposed by various financing arrangements and regulatory requirements on the ability of our subsidiaries to transfer funds to us in the form of cash dividends, loans or advances, that could prevent us from paying our common stock dividends, taxes, and other expenses, and meeting our debt obligations;

The risk of financial loss, including increases in bad debt expense, associated with the inability of our customers, counterparties, and affiliates to meet their obligations;

Changes in the creditworthiness of the counterparties with whom we have contractual arrangements, including participants in the energy trading markets and fuel suppliers and transporters;

The financial performance of ATC and its corresponding contribution to our earnings;

The investment performance of our employee benefit plan assets, as well as unanticipated changes in related actuarial assumptions, which could impact future funding requirements;

Factors affecting the employee workforce, including loss of key personnel, internal restructuring, work stoppages, and collective bargaining agreements and negotiations with union employees;

Advances in technology, and related legislation or regulation supporting the use of that technology, that result in competitive disadvantages and create the potential for impairment of existing assets;

The risk associated with the values of goodwill and other intangible assets and their possible impairment;

Potential business strategies to acquire and dispose of assets or businesses, which cannot be assured to be completed timely or within budgets, and legislative or regulatory restrictions or caps on non-utility acquisitions, investments or projects, including the State of Wisconsin's public utility holding company law;

The timing and outcome of any audits, disputes, and other proceedings related to taxes;

The ability to maintain effective internal controls in accordance with Section 404 of the Sarbanes-Oxley Act, while both integrating and continuing to consolidate our enterprise systems;

The effect of accounting pronouncements issued periodically by standard-setting bodies; and

Other considerations disclosed elsewhere herein and in other reports we file with the SEC or in other publicly disseminated written documents.

We expressly disclaim any obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise.

09/30/2020 Form 10-Q
2
WEC Energy Group, Inc.

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

WEC ENERGY GROUP, INC.

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

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

09/30/2020 Form 10-Q
3
WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

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 

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

09/30/2020 Form 10-Q
4
WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

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 

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.
09/30/2020 Form 10-Q
5
WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

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 

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

09/30/2020 Form 10-Q
6
WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

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 

09/30/2020 Form 10-Q
7
WEC Energy Group, Inc.

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 

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

09/30/2020 Form 10-Q
8
WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)
September 30, 2020

NOTE 1—GENERAL INFORMATION

WEC Energy Group serves approximately 1.6 million electric customers and 2.9 million natural gas customers, owns approximately 60% of ATC, and owns majority interests in multiple wind generating facilities as part of its non-utility energy infrastructure business.

As used in these notes, the term "financial statements" refers to the condensed consolidated financial statements. This includes the income statements, statements of comprehensive income, balance sheets, statements of cash flows, and statements of equity, unless otherwise noted. In this report, when we refer to "the Company," "us," "we," "our," or "ours," we are referring to WEC Energy Group and all of its subsidiaries.

On our financial statements, we consolidate our majority-owned subsidiaries and reflect noncontrolling interests for the portion of entities that we do not own as a component of consolidated equity separate from the equity attributable to our shareholders. The noncontrolling interests that we reported as equity on our balance sheets related to the minority interests at Bishop Hill III, Coyote Ridge, and Upstream held by third parties. See Note 2, Acquisitions, for more information on Upstream.

We use the equity method to account for investments in companies we do not control but over which we exercise significant influence regarding their operating and financial policies. As a result of our limited voting rights, we account for ATC and ATC Holdco as equity method investments. See Note 19, Investment in Transmission Affiliates, for more information.

We have prepared the unaudited interim financial statements presented in this Form 10-Q pursuant to the rules and regulations of the SEC and GAAP. Accordingly, these financial statements do not include all of the information and footnotes required by GAAP for annual financial statements. These financial statements should be read in conjunction with the consolidated financial statements and footnotes in our Annual Report on Form 10-K for the year ended December 31, 2019. Financial results for an interim period may not give a true indication of results for the year. In particular, the results of operations for the three and nine months ended September 30, 2020, are not necessarily indicative of expected results for 2020 due to seasonal variations and other factors, including any continuing financial impacts from the COVID-19 pandemic.

In management's opinion, we have included all adjustments, normal and recurring in nature, necessary for a fair presentation of our financial results.

NOTE 2—ACQUISITIONS

On January 1, 2018, we adopted ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (ASU 2017-01). The amendments in this update clarify the definition of a business and provide guidance on evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 also clarifies that transaction costs are capitalized in an asset acquisition but expensed in a business combination.

Acquisition of a Wind Energy Generation Facility in South Dakota

In July 2020, WECI signed an agreement to acquire an 85% ownership interest in Tatanka Ridge, a 155 MW wind generating facility under construction in Deuel County, South Dakota. We expect WECI's total investment to be approximately $235 million. Tatanka Ridge has long-term offtake agreements for all the energy produced with an affiliate of an investment grade multinational company and a well-established electric cooperative that serves utilities in multiple states. Under the Tax Legislation, WECI's investment in Tatanka Ridge is expected to qualify for production tax credits. The transaction was approved by FERC in October 2020 and is expected to close during the fourth quarter of 2020, with commercial operation expected to begin by early 2021. WECI will provide guarantees for certain construction obligations during the period between closing and commercial operation. Tatanka Ridge will be included in the non-utility energy infrastructure segment.

09/30/2020 Form 10-Q
9
WEC Energy Group, Inc.

Acquisition of Wind Generation Facilities in Nebraska

In August 2019, WECI signed an agreement to acquire an 80% ownership interest in Thunderhead, a 300 MW wind generating facility under construction in Antelope and Wheeler counties in Nebraska, for a total investment of approximately $338 million. In February 2020, WECI agreed to acquire an additional 10% ownership interest in Thunderhead for $43 million. The project has an offtake agreement with an unaffiliated third party for all of the energy to be produced by the facility for 12 years. Under the Tax Legislation, WECI's investment in Thunderhead is expected to qualify for production tax credits . The transaction was approved by FERC in April 2020, and commercial operation was initially expected to begin by the end of 2020. However, due to a court ruling suspending a key permit and the subsequent decision by the local utility to suspend construction of the required substation, the commercial operation of Thunderhead could be delayed until as late as the summer of 2021. The transaction is expected to close upon commercial operation. Thunderhead will be included in the non-utility energy infrastructure segment.

In January 2019, WECI completed the acquisition of an 80% ownership interest in Upstream, a commercially operational 202.5 MW wind generating facility, for $268.2 million, which included transaction costs and is net of cash and restricted cash acquired of $9.2 million. In April 2020, WECI completed the acquisition of an additional 10% ownership interest in Upstream for approximately $31.0 million. Upstream is located in Antelope County, Nebraska and supplies energy to the Southwest Power Pool. Upstream's revenue will be substantially fixed over 10 years through an agreement with an unaffiliated third party. Under the Tax Legislation, WECI's investment in Upstream qualifies for production tax credits. Upstream is included in the non-utility energy infrastructure segment.

The table below shows the allocation of the purchase price to the assets acquired and liabilities assumed at the date of the acquisition of the initial 80% ownership interest in Upstream.
(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 

Acquisition of a Wind Energy Generation Facility in Illinois

In January 2020, WECI signed an agreement to acquire an 80% ownership interest in Blooming Grove, a 250 MW wind generating facility under construction in McLean County, Illinois, for a total investment of approximately $345 million. In February 2020, WECI agreed to acquire an additional 10% ownership interest in Blooming Grove for $44 million. Blooming Grove has long-term offtake agreements for all the energy produced with affiliates of two investment grade multinational companies. Under the Tax Legislation, WECI's investment in Blooming Grove is expected to qualify for production tax credits. The transaction was approved by FERC in October 2020 and commercial operation is expected to begin by the end of 2020, at which time the transaction is expected to close. Blooming Grove will be included in the non-utility energy infrastructure segment.

NOTE 3—DISPOSITION

Corporate and Other Segment – Sale of Certain WPS Power Development, LLC Solar Power Generation Facilities

In June 2019, we sold three solar power generation facilities owned by PDL for $20.0 million. These solar facilities were located in Massachusetts. During the second quarter of 2019, we recorded an after-tax gain on the sale of $4.9 million primarily related to the recognition of deferred investment tax credits, which were included as a reduction of income tax expense on our income statements. The assets included in the sale were not material and, therefore, were not presented as held for sale. The results of operations of these facilities remained in continuing operations through the sale date as the sale did not represent a shift in our corporate strategy and did not have a major effect on our operations and financial results.

09/30/2020 Form 10-Q
10
WEC Energy Group, Inc.

NOTE 4—OPERATING REVENUES

For more information about our operating revenues, see Note 1(d), Operating Revenues, in our 2019 Annual Report on Form 10-K.

Disaggregation of Operating Revenues

The following tables present our operating revenues disaggregated by revenue source. We do not have any revenues associated with our electric transmission segment, which includes investments accounted for using the equity method. We disaggregate revenues into categories that depict how the nature, amount, timing, and uncertainty of revenues and cash flows are affected by economic factors. For our segments, revenues are further disaggregated by electric and natural gas operations and then by customer class. Each customer class within our electric and natural gas operations have different expectations of service, energy and demand requirements, and can be impacted differently by regulatory activities within their jurisdictions.

(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 

(in millions) Wisconsin Illinois Other States Total Utility Operations Non-Utility Energy Infrastructure Corporate and Other Reconciling Eliminations WEC Energy Group Consolidated
Nine Months Ended September 30, 2020
Electric $ 3,247.1  $   $   $ 3,247.1  $   $   $   $ 3,247.1 
Natural gas 817.2  901.5  245.3  1,964.0  32.3    (30.6) 1,965.7 
Total regulated revenues 4,064.3  901.5  245.3  5,211.1  32.3    (30.6) 5,212.8 
Other non-utility revenues   0.1  12.8  12.9  48.2  1.7  (7.1) 55.7 
Total revenues from contracts with customers 4,064.3  901.6  258.1  5,224.0  80.5  1.7  (37.7) 5,268.5 
Other operating revenues 7.1  29.1  3.3  39.5  297.9  0.3  (297.9) 39.8 
Total operating revenues $ 4,071.4  $ 930.7  $ 261.4  $ 5,263.5  $ 378.4  $ 2.0  $ (335.6) $ 5,308.3 
09/30/2020 Form 10-Q
11
WEC Energy Group, Inc.

(in millions) Wisconsin Illinois Other States Total Utility Operations Non-Utility Energy Infrastructure Corporate and Other Reconciling Eliminations WEC Energy Group Consolidated
Nine Months Ended September 30, 2019
Electric $ 3,269.1  $ —  $ —  $ 3,269.1  $ —  $ —  $ —  $ 3,269.1 
Natural gas 943.3  967.4  293.0  2,203.7  35.1  —  (32.2) 2,206.6 
Total regulated revenues 4,212.4  967.4  293.0  5,472.8  35.1  —  (32.2) 5,475.7 
Other non-utility revenues —  0.1  12.5  12.6  40.6  3.6  (4.5) 52.3 
Total revenues from contracts with customers 4,212.4  967.5  305.5  5,485.4  75.7  3.6  (36.7) 5,528.0 
Other operating revenues 13.6  9.9  (2.6) 20.9  294.8  0.3  (268.4) 47.6 
Total operating revenues $ 4,226.0  $ 977.4  $ 302.9  $ 5,506.3  $ 370.5  $ 3.9  $ (305.1) $ 5,575.6 

Revenues from Contracts with Customers

Electric Utility Operating Revenues

The following table disaggregates electric utility operating revenues into customer class:
Electric Utility Operating Revenues
Three Months Ended September 30 Nine Months Ended September 30
(in millions) 2020 2019 2020 2019
Residential $ 500.8  $ 454.7  $ 1,324.4  $ 1,218.1 
Small commercial and industrial 373.6  385.6  1,004.3  1,050.8 
Large commercial and industrial 244.0  237.9  626.4  668.0 
Other 6.9  6.9  21.1  22.0 
Total retail revenues 1,125.3  1,085.1  2,976.2  2,958.9 
Wholesale 46.5  53.1  129.9  145.4 
Resale 33.7  29.5  107.3  119.7 
Steam 2.5  2.4  15.0  16.8 
Other utility revenues 4.9  15.3  18.7  28.3 
Total electric utility operating revenues $ 1,212.9  $ 1,185.4  $ 3,247.1  $ 3,269.1 

Natural Gas Utility Operating Revenues

The following tables disaggregate natural gas utility operating revenues into customer class:
(in millions) Wisconsin Illinois Other States Total Natural Gas Utility Operating Revenues
Three Months Ended September 30, 2020      
Residential $ 74.6  $ 128.6  $ 18.8  $ 222.0 
Commercial and industrial 28.3  28.6  10.2  67.1 
Total retail revenues 102.9  157.2  29.0  289.1 
Transport 15.7  40.0  5.3  61.0 
Other utility revenues (1)
31.9  16.2  8.8  56.9 
Total natural gas utility operating revenues $ 150.5  $ 213.4  $ 43.1  $ 407.0 

09/30/2020 Form 10-Q
12
WEC Energy Group, Inc.

(in millions) Wisconsin Illinois Other States Total Natural Gas Utility Operating Revenues
Three Months Ended September 30, 2019      
Residential $ 69.3  $ 117.6  $ 22.5  $ 209.4 
Commercial and industrial 30.0  29.3  11.5  70.8 
Total retail revenues 99.3  146.9  34.0  280.2 
Transport 14.4  44.3  5.6  64.3 
Other utility revenues (1)
37.4  (1.2) 4.2  40.4 
Total natural gas utility operating revenues $ 151.1  $ 190.0  $ 43.8  $ 384.9 

(in millions) Wisconsin Illinois Other States Total Natural Gas Utility Operating Revenues
Nine Months Ended September 30, 2020
Residential $ 513.5  $ 568.9  $ 154.1  $ 1,236.5 
Commercial and industrial 226.6  156.5  78.5  461.6 
Total retail revenues 740.1  725.4  232.6  1,698.1 
Transport 56.8  159.0  22.8  238.6