000009212200000031530000041091000006690400011606610001004155FALSE2022Q2--12-31http://fasb.org/us-gaap/2022#NaturalGasUsRegulatedMemberhttp://fasb.org/us-gaap/2022#NaturalGasUsRegulatedMemberhttp://fasb.org/us-gaap/2022#NaturalGasUsRegulatedMemberhttp://fasb.org/us-gaap/2022#NaturalGasUsRegulatedMemberP3M611116111161111611116111100000921222022-01-012022-06-300000092122so:AlabamaPowerMember2022-01-012022-06-300000092122so:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMember2022-01-012022-06-300000092122so:SouthernPowerMember2022-01-012022-06-300000092122so:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:CommonStockMember2022-01-012022-06-300000092122so:Series2017B5.25JuniorSubordinatedNotesDue2077Member2022-01-012022-06-300000092122so:TwoThousandNineteenSeriesACorporateUnitsMember2022-01-012022-06-300000092122so:Series2020A4.95JuniorSubordinatedNotesDue2080Member2022-01-012022-06-300000092122so:Series2020C420JuniorSubordinatedNotesDue2060Member2022-01-012022-06-300000092122so:Series2021B1875FixedToFixedResetRateJuniorSubordinatedNotesDue2081Member2022-01-012022-06-300000092122so:A5.00SeriesClassAPreferredStockMemberso:AlabamaPowerMember2022-01-012022-06-300000092122so:GeorgiaPowerMemberso:Series2017A5.00JuniorSubordinatedNotesDue2077Member2022-01-012022-06-300000092122so:Series2016A1.000SeniorNotesDue2022Memberso:SouthernPowerMember2022-01-012022-06-300000092122so:Series2016B1.850SeniorNotesDue2026Memberso:SouthernPowerMember2022-01-012022-06-3000000921222022-06-30xbrli:shares0000092122so:AlabamaPowerMember2022-06-300000092122so:GeorgiaPowerMember2022-06-300000092122so:MississippiPowerMember2022-06-300000092122so:SouthernPowerMember2022-06-300000092122so:SouthernCompanyGasMember2022-06-300000092122us-gaap:RetailMember2022-04-012022-06-30iso4217:USD0000092122us-gaap:RetailMember2021-04-012021-06-300000092122us-gaap:RetailMember2022-01-012022-06-300000092122us-gaap:RetailMember2021-01-012021-06-300000092122so:WholesaleElectricMember2022-04-012022-06-300000092122so:WholesaleElectricMember2021-04-012021-06-300000092122so:WholesaleElectricMember2022-01-012022-06-300000092122so:WholesaleElectricMember2021-01-012021-06-300000092122so:OtherElectricRevenueMember2022-04-012022-06-300000092122so:OtherElectricRevenueMember2021-04-012021-06-300000092122so:OtherElectricRevenueMember2022-01-012022-06-300000092122so:OtherElectricRevenueMember2021-01-012021-06-300000092122us-gaap:AlternativeEnergyMember2021-04-012021-06-300000092122us-gaap:AlternativeEnergyMember2022-04-012022-06-300000092122us-gaap:AlternativeEnergyMember2022-01-012022-06-300000092122us-gaap:AlternativeEnergyMember2021-01-012021-06-300000092122so:NaturalGasMember2022-04-012022-06-300000092122so:NaturalGasMember2021-04-012021-06-300000092122so:NaturalGasMember2022-01-012022-06-300000092122so:NaturalGasMember2021-01-012021-06-300000092122us-gaap:ProductAndServiceOtherMember2022-04-012022-06-300000092122us-gaap:ProductAndServiceOtherMember2021-04-012021-06-300000092122us-gaap:ProductAndServiceOtherMember2022-01-012022-06-300000092122us-gaap:ProductAndServiceOtherMember2021-01-012021-06-3000000921222022-04-012022-06-3000000921222021-04-012021-06-3000000921222021-01-012021-06-300000092122srt:FuelMember2022-04-012022-06-300000092122srt:FuelMember2021-04-012021-06-300000092122srt:FuelMember2022-01-012022-06-300000092122srt:FuelMember2021-01-012021-06-300000092122us-gaap:ElectricityPurchasedMember2022-04-012022-06-300000092122us-gaap:ElectricityPurchasedMember2021-04-012021-06-300000092122us-gaap:ElectricityPurchasedMember2022-01-012022-06-300000092122us-gaap:ElectricityPurchasedMember2021-01-012021-06-300000092122us-gaap:NaturalGasUsRegulatedMember2022-04-012022-06-300000092122us-gaap:NaturalGasUsRegulatedMember2021-04-012021-06-300000092122us-gaap:NaturalGasUsRegulatedMember2022-01-012022-06-300000092122us-gaap:NaturalGasUsRegulatedMember2021-01-012021-06-30iso4217:USDxbrli:shares00000921222021-12-3100000921222020-12-3100000921222021-06-300000092122us-gaap:CommonStockMember2020-12-310000092122us-gaap:TreasuryStockCommonMember2020-12-310000092122us-gaap:AdditionalPaidInCapitalMember2020-12-310000092122us-gaap:RetainedEarningsMember2020-12-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000092122us-gaap:NoncontrollingInterestMember2020-12-310000092122us-gaap:RetainedEarningsMember2021-01-012021-03-310000092122us-gaap:NoncontrollingInterestMember2021-01-012021-03-3100000921222021-01-012021-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-03-310000092122us-gaap:CommonStockMember2021-01-012021-03-310000092122us-gaap:AdditionalPaidInCapitalMember2021-01-012021-03-310000092122us-gaap:CommonStockMember2021-03-310000092122us-gaap:TreasuryStockCommonMember2021-03-310000092122us-gaap:AdditionalPaidInCapitalMember2021-03-310000092122us-gaap:RetainedEarningsMember2021-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000092122us-gaap:NoncontrollingInterestMember2021-03-3100000921222021-03-310000092122us-gaap:RetainedEarningsMember2021-04-012021-06-300000092122us-gaap:NoncontrollingInterestMember2021-04-012021-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000092122us-gaap:CommonStockMember2021-04-012021-06-300000092122us-gaap:AdditionalPaidInCapitalMember2021-04-012021-06-300000092122us-gaap:TreasuryStockCommonMember2021-04-012021-06-300000092122us-gaap:CommonStockMember2021-06-300000092122us-gaap:TreasuryStockCommonMember2021-06-300000092122us-gaap:AdditionalPaidInCapitalMember2021-06-300000092122us-gaap:RetainedEarningsMember2021-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000092122us-gaap:NoncontrollingInterestMember2021-06-300000092122us-gaap:CommonStockMember2021-12-310000092122us-gaap:TreasuryStockCommonMember2021-12-310000092122us-gaap:AdditionalPaidInCapitalMember2021-12-310000092122us-gaap:RetainedEarningsMember2021-12-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000092122us-gaap:NoncontrollingInterestMember2021-12-310000092122us-gaap:RetainedEarningsMember2022-01-012022-03-310000092122us-gaap:NoncontrollingInterestMember2022-01-012022-03-3100000921222022-01-012022-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-03-310000092122us-gaap:CommonStockMember2022-01-012022-03-310000092122us-gaap:AdditionalPaidInCapitalMember2022-01-012022-03-310000092122us-gaap:TreasuryStockCommonMember2022-01-012022-03-310000092122us-gaap:CommonStockMember2022-03-310000092122us-gaap:TreasuryStockCommonMember2022-03-310000092122us-gaap:AdditionalPaidInCapitalMember2022-03-310000092122us-gaap:RetainedEarningsMember2022-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-03-310000092122us-gaap:NoncontrollingInterestMember2022-03-3100000921222022-03-310000092122us-gaap:RetainedEarningsMember2022-04-012022-06-300000092122us-gaap:NoncontrollingInterestMember2022-04-012022-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-04-012022-06-300000092122us-gaap:CommonStockMember2022-04-012022-06-300000092122us-gaap:AdditionalPaidInCapitalMember2022-04-012022-06-300000092122us-gaap:TreasuryStockCommonMember2022-04-012022-06-300000092122us-gaap:CommonStockMember2022-06-300000092122us-gaap:TreasuryStockCommonMember2022-06-300000092122us-gaap:AdditionalPaidInCapitalMember2022-06-300000092122us-gaap:RetainedEarningsMember2022-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-300000092122us-gaap:NoncontrollingInterestMember2022-06-300000092122us-gaap:RetailMemberso:AlabamaPowerMember2022-04-012022-06-300000092122us-gaap:RetailMemberso:AlabamaPowerMember2021-04-012021-06-300000092122us-gaap:RetailMemberso:AlabamaPowerMember2022-01-012022-06-300000092122us-gaap:RetailMemberso:AlabamaPowerMember2021-01-012021-06-300000092122so:WholesaleNonAffiliatesMemberso:AlabamaPowerMember2022-04-012022-06-300000092122so:WholesaleNonAffiliatesMemberso:AlabamaPowerMember2021-04-012021-06-300000092122so:WholesaleNonAffiliatesMemberso:AlabamaPowerMember2022-01-012022-06-300000092122so:WholesaleNonAffiliatesMemberso:AlabamaPowerMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:WholesaleAffiliatesMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:WholesaleAffiliatesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:WholesaleAffiliatesMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:WholesaleAffiliatesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberus-gaap:ProductAndServiceOtherMember2022-04-012022-06-300000092122so:AlabamaPowerMemberus-gaap:ProductAndServiceOtherMember2021-04-012021-06-300000092122so:AlabamaPowerMemberus-gaap:ProductAndServiceOtherMember2022-01-012022-06-300000092122so:AlabamaPowerMemberus-gaap:ProductAndServiceOtherMember2021-01-012021-06-300000092122so:AlabamaPowerMember2022-04-012022-06-300000092122so:AlabamaPowerMember2021-04-012021-06-300000092122so:AlabamaPowerMember2021-01-012021-06-300000092122so:AlabamaPowerMembersrt:FuelMember2022-04-012022-06-300000092122so:AlabamaPowerMembersrt:FuelMember2021-04-012021-06-300000092122so:AlabamaPowerMembersrt:FuelMember2022-01-012022-06-300000092122so:AlabamaPowerMembersrt:FuelMember2021-01-012021-06-300000092122so:AlabamaPowerMemberus-gaap:ElectricityPurchasedMember2022-04-012022-06-300000092122so:AlabamaPowerMemberus-gaap:ElectricityPurchasedMember2021-04-012021-06-300000092122so:AlabamaPowerMemberus-gaap:ElectricityPurchasedMember2022-01-012022-06-300000092122so:AlabamaPowerMemberus-gaap:ElectricityPurchasedMember2021-01-012021-06-300000092122so:ElectricityPurchasedAffiliatesMemberso:AlabamaPowerMember2022-04-012022-06-300000092122so:ElectricityPurchasedAffiliatesMemberso:AlabamaPowerMember2021-04-012021-06-300000092122so:ElectricityPurchasedAffiliatesMemberso:AlabamaPowerMember2022-01-012022-06-300000092122so:ElectricityPurchasedAffiliatesMemberso:AlabamaPowerMember2021-01-012021-06-300000092122so:AlabamaPowerMember2021-12-310000092122so:AlabamaPowerMember2020-12-310000092122so:AlabamaPowerMember2021-06-300000092122so:AlabamaPowerMemberus-gaap:CommonStockMember2020-12-310000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2020-12-310000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2021-01-012021-03-310000092122so:AlabamaPowerMember2021-01-012021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2021-01-012021-03-310000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-03-310000092122so:AlabamaPowerMemberus-gaap:CommonStockMember2021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2021-03-310000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000092122so:AlabamaPowerMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2021-04-012021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2021-04-012021-06-300000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000092122so:AlabamaPowerMemberus-gaap:CommonStockMember2021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2021-06-300000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2021-06-300000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000092122so:AlabamaPowerMemberus-gaap:CommonStockMember2021-12-310000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2021-12-310000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2022-01-012022-03-310000092122so:AlabamaPowerMember2022-01-012022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2022-01-012022-03-310000092122so:AlabamaPowerMemberus-gaap:CommonStockMember2022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2022-03-310000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-03-310000092122so:AlabamaPowerMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2022-04-012022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2022-04-012022-06-300000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-04-012022-06-300000092122so:AlabamaPowerMemberus-gaap:CommonStockMember2022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:AlabamaPowerMember2022-06-300000092122us-gaap:RetainedEarningsMemberso:AlabamaPowerMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-300000092122us-gaap:RetailMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122us-gaap:RetailMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122us-gaap:RetailMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122us-gaap:RetailMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:WholesaleElectricMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:WholesaleElectricMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:WholesaleElectricMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:WholesaleElectricMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122us-gaap:ProductAndServiceOtherMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122us-gaap:ProductAndServiceOtherMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122us-gaap:ProductAndServiceOtherMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122us-gaap:ProductAndServiceOtherMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:GeorgiaPowerMember2022-04-012022-06-300000092122so:GeorgiaPowerMember2021-04-012021-06-300000092122so:GeorgiaPowerMember2021-01-012021-06-300000092122srt:FuelMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122srt:FuelMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122srt:FuelMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122srt:FuelMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122us-gaap:ElectricityPurchasedMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122us-gaap:ElectricityPurchasedMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122us-gaap:ElectricityPurchasedMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122us-gaap:ElectricityPurchasedMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:ElectricityPurchasedAffiliatesMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:ElectricityPurchasedAffiliatesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:ElectricityPurchasedAffiliatesMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:ElectricityPurchasedAffiliatesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:GeorgiaPowerMember2021-12-310000092122so:GeorgiaPowerMember2020-12-310000092122so:GeorgiaPowerMember2021-06-300000092122so:GeorgiaPowerMemberus-gaap:CommonStockMember2020-12-310000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2020-12-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2021-01-012021-03-310000092122so:GeorgiaPowerMember2021-01-012021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2021-01-012021-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2021-01-012021-03-310000092122so:GeorgiaPowerMemberus-gaap:CommonStockMember2021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2021-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2021-03-310000092122so:GeorgiaPowerMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:GeorgiaPowerMemberus-gaap:CommonStockMember2021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2021-06-300000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2021-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2021-06-300000092122so:GeorgiaPowerMemberus-gaap:CommonStockMember2021-12-310000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2021-12-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2022-01-012022-03-310000092122so:GeorgiaPowerMember2022-01-012022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2022-01-012022-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2022-01-012022-03-310000092122so:GeorgiaPowerMemberus-gaap:CommonStockMember2022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2022-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2022-03-310000092122so:GeorgiaPowerMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:GeorgiaPowerMemberus-gaap:CommonStockMember2022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:RetainedEarningsMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:RetailMemberso:MississippiPowerMember2022-04-012022-06-300000092122us-gaap:RetailMemberso:MississippiPowerMember2021-04-012021-06-300000092122us-gaap:RetailMemberso:MississippiPowerMember2022-01-012022-06-300000092122us-gaap:RetailMemberso:MississippiPowerMember2021-01-012021-06-300000092122so:WholesaleNonAffiliatesMemberso:MississippiPowerMember2022-04-012022-06-300000092122so:WholesaleNonAffiliatesMemberso:MississippiPowerMember2021-04-012021-06-300000092122so:WholesaleNonAffiliatesMemberso:MississippiPowerMember2022-01-012022-06-300000092122so:WholesaleNonAffiliatesMemberso:MississippiPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:WholesaleAffiliatesMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:WholesaleAffiliatesMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:WholesaleAffiliatesMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:WholesaleAffiliatesMember2021-01-012021-06-300000092122so:MississippiPowerMemberus-gaap:ProductAndServiceOtherMember2022-04-012022-06-300000092122so:MississippiPowerMemberus-gaap:ProductAndServiceOtherMember2021-04-012021-06-300000092122so:MississippiPowerMemberus-gaap:ProductAndServiceOtherMember2022-01-012022-06-300000092122so:MississippiPowerMemberus-gaap:ProductAndServiceOtherMember2021-01-012021-06-300000092122so:MississippiPowerMember2022-04-012022-06-300000092122so:MississippiPowerMember2021-04-012021-06-300000092122so:MississippiPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:FuelAndPurchasedPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:FuelAndPurchasedPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:FuelAndPurchasedPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:FuelAndPurchasedPowerMember2021-01-012021-06-300000092122so:MississippiPowerMember2021-12-310000092122so:MississippiPowerMember2020-12-310000092122so:MississippiPowerMember2021-06-300000092122so:MississippiPowerMemberus-gaap:CommonStockMember2020-12-310000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2020-12-310000092122so:MississippiPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2021-01-012021-03-310000092122so:MississippiPowerMember2021-01-012021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2021-01-012021-03-310000092122so:MississippiPowerMemberus-gaap:CommonStockMember2021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2021-03-310000092122so:MississippiPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000092122so:MississippiPowerMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2021-04-012021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000092122so:MississippiPowerMemberus-gaap:CommonStockMember2021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2021-06-300000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2021-06-300000092122so:MississippiPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000092122so:MississippiPowerMemberus-gaap:CommonStockMember2021-12-310000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2021-12-310000092122so:MississippiPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2022-01-012022-03-310000092122so:MississippiPowerMember2022-01-012022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2022-01-012022-03-310000092122so:MississippiPowerMemberus-gaap:CommonStockMember2022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2022-03-310000092122so:MississippiPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-03-310000092122so:MississippiPowerMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2022-04-012022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberus-gaap:CommonStockMember2022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:MississippiPowerMember2022-06-300000092122us-gaap:RetainedEarningsMemberso:MississippiPowerMember2022-06-300000092122so:MississippiPowerMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-300000092122so:WholesaleNonAffiliatesMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:WholesaleNonAffiliatesMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:WholesaleNonAffiliatesMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:WholesaleNonAffiliatesMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:WholesaleAffiliatesMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:WholesaleAffiliatesMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:WholesaleAffiliatesMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:WholesaleAffiliatesMemberso:SouthernPowerMember2021-01-012021-06-300000092122us-gaap:ProductAndServiceOtherMemberso:SouthernPowerMember2022-04-012022-06-300000092122us-gaap:ProductAndServiceOtherMemberso:SouthernPowerMember2021-04-012021-06-300000092122us-gaap:ProductAndServiceOtherMemberso:SouthernPowerMember2022-01-012022-06-300000092122us-gaap:ProductAndServiceOtherMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:SouthernPowerMember2022-04-012022-06-300000092122so:SouthernPowerMember2021-04-012021-06-300000092122so:SouthernPowerMember2021-01-012021-06-300000092122srt:FuelMemberso:SouthernPowerMember2022-04-012022-06-300000092122srt:FuelMemberso:SouthernPowerMember2021-04-012021-06-300000092122srt:FuelMemberso:SouthernPowerMember2022-01-012022-06-300000092122srt:FuelMemberso:SouthernPowerMember2021-01-012021-06-300000092122us-gaap:ElectricityPurchasedMemberso:SouthernPowerMember2022-04-012022-06-300000092122us-gaap:ElectricityPurchasedMemberso:SouthernPowerMember2021-04-012021-06-300000092122us-gaap:ElectricityPurchasedMemberso:SouthernPowerMember2022-01-012022-06-300000092122us-gaap:ElectricityPurchasedMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:SouthernPowerMember2021-12-310000092122so:SouthernPowerMember2020-12-310000092122so:SouthernPowerMember2021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2020-12-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2020-12-310000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2020-12-310000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2021-01-012021-03-310000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2021-01-012021-03-310000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2021-01-012021-03-310000092122so:SouthernPowerMember2021-01-012021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2021-01-012021-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2021-01-012021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2021-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2021-03-310000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2021-03-310000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2021-03-310000092122so:SouthernPowerMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2021-04-012021-06-300000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2021-04-012021-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2021-04-012021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2021-04-012021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2021-06-300000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2021-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2021-06-300000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2021-06-300000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2021-12-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2021-12-310000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2021-12-310000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2022-01-012022-03-310000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2022-01-012022-03-310000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2022-01-012022-03-310000092122so:SouthernPowerMember2022-01-012022-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2022-01-012022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2022-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2022-03-310000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2022-03-310000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2022-03-310000092122so:SouthernPowerMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2022-04-012022-06-300000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2022-04-012022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2022-04-012022-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2022-04-012022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernPowerMember2022-06-300000092122us-gaap:RetainedEarningsMemberso:SouthernPowerMember2022-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernPowerMember2022-06-300000092122so:SouthernPowerMemberso:CommonStockholdersEquityNotIncludingNoncontrollingInterestMember2022-06-300000092122us-gaap:NoncontrollingInterestMemberso:SouthernPowerMember2022-06-300000092122so:SouthernCompanyGasMember2022-04-012022-06-300000092122so:SouthernCompanyGasMember2021-04-012021-06-300000092122so:SouthernCompanyGasMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberus-gaap:NaturalGasUsRegulatedMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberus-gaap:NaturalGasUsRegulatedMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberus-gaap:NaturalGasUsRegulatedMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberus-gaap:NaturalGasUsRegulatedMember2021-01-012021-06-300000092122us-gaap:AlternativeEnergyMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122us-gaap:AlternativeEnergyMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122us-gaap:AlternativeEnergyMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:AlternativeEnergyMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:SouthernCompanyGasMember2021-12-310000092122so:SouthernCompanyGasMember2020-12-310000092122so:SouthernCompanyGasMember2021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2020-12-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2020-12-310000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2021-01-012021-03-310000092122so:SouthernCompanyGasMember2021-01-012021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2021-01-012021-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2021-01-012021-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2021-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2021-03-310000092122so:SouthernCompanyGasMember2021-03-310000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2021-06-300000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2021-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2021-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2022-01-012022-03-310000092122so:SouthernCompanyGasMember2022-01-012022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2022-01-012022-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2022-01-012022-03-310000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2022-03-310000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2022-03-310000092122so:SouthernCompanyGasMember2022-03-310000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122us-gaap:AdditionalPaidInCapitalMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:RetainedEarningsMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:AccumulatedOtherComprehensiveIncomeMemberso:SouthernCompanyGasMember2022-06-300000092122so:GasDistributionOperationsMemberso:SouthernCompanyGasMember2021-12-310000092122so:GasDistributionOperationsMemberso:SouthernCompanyGasMember2022-06-300000092122so:GasMarketingServicesMemberso:SouthernCompanyGasMember2021-12-310000092122so:GasMarketingServicesMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:CustomerRelationshipsMember2022-06-300000092122us-gaap:CustomerRelationshipsMember2021-12-310000092122us-gaap:TradeNamesMember2022-06-300000092122us-gaap:TradeNamesMember2021-12-310000092122so:PPAFairValueAdjustmentsMember2022-06-300000092122so:PPAFairValueAdjustmentsMember2021-12-310000092122us-gaap:OtherIntangibleAssetsMember2022-06-300000092122us-gaap:OtherIntangibleAssetsMember2021-12-310000092122so:SouthernPowerMemberso:PPAFairValueAdjustmentsMember2022-06-300000092122so:SouthernPowerMemberso:PPAFairValueAdjustmentsMember2021-12-310000092122so:SouthernCompanyGasMemberus-gaap:CustomerRelationshipsMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:CustomerRelationshipsMember2021-12-310000092122us-gaap:TradeNamesMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:TradeNamesMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:OtherCurrentAssetsMember2022-06-300000092122us-gaap:OtherCurrentAssetsMember2021-12-310000092122us-gaap:OtherCurrentAssetsMemberso:SouthernPowerMember2022-06-300000092122us-gaap:OtherCurrentAssetsMemberso:SouthernPowerMember2021-12-310000092122us-gaap:OtherCurrentAssetsMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:OtherCurrentAssetsMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:OtherNoncurrentAssetsMember2022-06-300000092122us-gaap:OtherNoncurrentAssetsMember2021-12-310000092122us-gaap:OtherNoncurrentAssetsMemberso:SouthernPowerMember2022-06-300000092122us-gaap:OtherNoncurrentAssetsMemberso:SouthernPowerMember2021-12-310000092122us-gaap:OtherNoncurrentAssetsMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:OtherNoncurrentAssetsMemberso:SouthernCompanyGasMember2021-12-310000092122so:DeuelHarvestMemberso:SouthernPowerMemberso:EstimatedConstructionCompletionCostsMember2022-06-300000092122so:DeuelHarvestMemberso:SouthernPowerMemberso:EstimatedConstructionCompletionCostsMember2021-12-310000092122so:TaxEquityContributionsMemberso:GarlandMemberso:SouthernPowerMember2021-12-310000092122so:WindGeneratingFacilityMembersrt:MaximumMemberso:SouthernPowerMember2021-01-012021-12-310000092122so:WindGeneratingFacilityMembersrt:MaximumMemberso:SouthernPowerMember2022-01-012022-01-010000092122so:AlabamaPowerMemberso:OtherRegulatoryAssetsDeferredMember2022-06-300000092122so:AlabamaPowerMemberso:OtherRegulatoryAssetsDeferredMember2021-12-310000092122so:AlabamaPowerMemberso:OtherRegulatoryAssetsCurrentMember2022-06-300000092122so:AlabamaPowerMemberso:OtherRegulatoryAssetsCurrentMember2021-12-310000092122us-gaap:OtherNoncurrentAssetsMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:OtherNoncurrentAssetsMemberso:GeorgiaPowerMember2021-12-310000092122so:MississippiPowerMemberso:OtherCustomerAccountsReceivableMember2022-06-300000092122so:MississippiPowerMemberso:OtherCustomerAccountsReceivableMember2021-12-310000092122so:MississippiPowerMemberso:OtherRegulatoryAssetsCurrentMember2022-06-300000092122so:MississippiPowerMemberso:OtherRegulatoryAssetsCurrentMember2021-12-310000092122so:MississippiPowerMemberso:OtherRegulatoryAssetsDeferredMember2022-06-300000092122so:MississippiPowerMemberso:OtherRegulatoryAssetsDeferredMember2021-12-310000092122so:SouthernCompanyGasMemberso:OtherRegulatoryAssetsCurrentMember2022-06-300000092122so:SouthernCompanyGasMemberso:OtherRegulatoryAssetsCurrentMember2021-12-310000092122so:OtherRegulatoryAssetsDeferredMemberso:SouthernCompanyGasMember2022-06-300000092122so:OtherRegulatoryAssetsDeferredMemberso:SouthernCompanyGasMember2021-12-310000092122so:AlabamaPowerMemberus-gaap:SubsequentEventMember2022-07-112022-07-11iso4217:USDso:KWH_Kilowatt_hour0000092122so:AlabamaPowerMemberus-gaap:SubsequentEventMember2022-07-122022-07-120000092122so:AlabamaPowerMembersrt:ScenarioForecastMember2025-01-012025-01-310000092122so:AlabamaPowerMemberus-gaap:SubsequentEventMembersrt:MinimumMember2022-07-122022-07-120000092122so:AlabamaPowerMemberus-gaap:SubsequentEventMembersrt:MaximumMember2022-07-122022-07-120000092122so:AlabamaPowerMemberus-gaap:SubsequentEventMember2022-07-120000092122so:AlabamaPowerMembersrt:ScenarioForecastMember2022-07-012022-12-310000092122so:AlabamaPowerMembersrt:ScenarioForecastMember2023-01-012023-12-31utr:MW0000092122so:AlabamaPowerMember2022-04-012022-04-30so:project0000092122so:AlabamaPowerMember2022-04-3000000921222022-06-242022-06-240000092122so:GeorgiaPowerMember2022-06-24xbrli:pure0000092122so:TraditionalBaseMemberso:GeorgiaPowerMember2022-06-240000092122so:EnvironmentalComplianceCostRecoveryTraditionalMemberso:GeorgiaPowerMember2022-06-240000092122so:EnvironmentalComplianceCostRecoveryCoalCombustionResidualsAssetRetirementObligationMemberso:GeorgiaPowerMember2022-06-240000092122so:DemandSideManagementMemberso:GeorgiaPowerMember2022-06-240000092122so:MunicipalFranchiseFeeMemberso:GeorgiaPowerMember2022-06-240000092122srt:MinimumMemberso:GeorgiaPowerMember2022-06-240000092122srt:MaximumMemberso:GeorgiaPowerMember2022-06-240000092122so:GeorgiaPowerMember2022-06-242022-06-240000092122so:PlantWansleyUnits1And2Memberus-gaap:SubsequentEventMemberso:GeorgiaPowerMember2022-07-212022-07-210000092122so:PlantWansleyUnits1And2Memberus-gaap:SubsequentEventMemberso:GeorgiaPowerMember2022-07-210000092122so:PlantWansleyUnit1Memberso:GeorgiaPowerMember2022-06-300000092122so:GeorgiaPowerMemberso:PlantWansleyUnit2Member2022-06-300000092122us-gaap:SubsequentEventMemberso:PlantSchererUnit3Memberso:GeorgiaPowerMember2022-07-212022-07-210000092122us-gaap:SubsequentEventMemberso:PlantSchererUnit3Memberso:GeorgiaPowerMember2022-07-210000092122so:PlantSchererUnit3Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:SubsequentEventMemberso:PlantGastonUnits1Through4Memberso:GeorgiaPowerMember2022-07-212022-07-210000092122us-gaap:SubsequentEventMemberso:PlantGastonUnits1Through4Memberso:GeorgiaPowerMember2022-07-210000092122us-gaap:SubsequentEventMemberso:GeorgiaPowerMember2022-07-21so:ashPond0000092122us-gaap:SubsequentEventMembersrt:ScenarioForecastMemberso:GeorgiaPowerMember2026-01-012026-12-310000092122us-gaap:SubsequentEventMembersrt:ScenarioForecastMemberso:RenewableResourcesMemberso:GeorgiaPowerMember2022-07-212022-07-210000092122us-gaap:SubsequentEventMembersrt:ScenarioForecastMemberso:EnergyStorageMemberso:GeorgiaPowerMember2022-07-212022-07-210000092122us-gaap:SubsequentEventMembersrt:ScenarioForecastMemberso:BiomassGenerationMemberso:GeorgiaPowerMember2022-07-212022-07-210000092122us-gaap:SubsequentEventMemberso:GeorgiaPowerMember2022-07-212022-07-21so:agreement0000092122us-gaap:SubsequentEventMembersrt:ScenarioForecastMemberso:GeorgiaPowerMember2024-01-012024-01-010000092122us-gaap:SubsequentEventMembersrt:ScenarioForecastMemberso:GeorgiaPowerMember2025-01-012025-01-010000092122us-gaap:SubsequentEventMembersrt:ScenarioForecastMemberso:GeorgiaPowerMember2028-01-012028-01-010000092122so:PlantBowenUnits1And2Memberus-gaap:SubsequentEventMemberso:GeorgiaPowerMember2022-07-212022-07-210000092122us-gaap:SubsequentEventMembersrt:ScenarioForecastMemberso:GeorgiaPowerMember2022-07-212022-07-210000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-06-300000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2012-01-012012-12-31so:utility0000092122so:VogtleOwnersMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:TwentyFifthVogtleConstructionMonitoringReportMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2021-06-300000092122so:TwentyFifthVogtleConstructionMonitoringReportMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:COVID19Membersrt:MinimumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:COVID19Membersrt:MaximumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:COVID19Membersrt:MinimumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-06-300000092122so:COVID19Membersrt:MaximumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-06-300000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2018-08-310000092122so:CategoryIMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-06-300000092122so:CategoryIMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:CategoryIIMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:CategoryIIMembersrt:MinimumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:CategoryIIMembersrt:MaximumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:CategoryIIMemberso:VogtleOwnersMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMemberso:CategoryIIIMember2022-01-012022-06-300000092122srt:MinimumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMemberso:CategoryIIIMember2022-01-012022-06-300000092122srt:MaximumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMemberso:CategoryIIIMember2022-01-012022-06-300000092122so:VogtleOwnersMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMemberso:CategoryIIIMember2022-01-012022-06-300000092122so:CounterclaimSeekingDeclaratoryJudgementMemberus-gaap:SubsequentEventMemberso:VogtleOwnersMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-07-250000092122so:GeorgiaPowerMember2021-10-012021-12-310000092122srt:MinimumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122srt:MaximumMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:VogtleOwnersMemberso:TenderProvisionDisputeMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-06-180000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2009-01-012009-12-310000092122so:TwentyFourthVogtleConstructionMonitoringReportMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-06-300000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-01-010000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2018-01-112018-01-110000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2013-12-310000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2016-01-012016-01-010000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2020-01-012020-01-010000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2021-01-012021-01-010000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2021-01-012021-12-310000092122srt:ScenarioForecastMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-12-310000092122srt:ScenarioForecastMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2023-01-012023-12-310000092122so:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2018-06-30so:report0000092122so:TwentyFourthVogtleConstructionMonitoringReportMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2021-06-300000092122so:TwentySixthVogtleConstructionMonitoringReportMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2021-01-012021-12-310000092122so:TwentySeventhVogtleConstructionMonitoringReportMemberso:PlantVogtleUnits3And4Memberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:PerformanceEvaluationPlanMember2022-06-072022-06-070000092122so:MississippiPowerMemberso:AdValoremTaxAdjustmentMember2022-06-072022-06-070000092122so:MississippiPowerMemberso:CooperativeEnergyMember2022-05-260000092122so:MississippiPowerMemberso:CooperativeEnergyMember2022-06-300000092122so:MississippiPowerMemberso:MunicipalAndRuralAssociationsTariffMemberus-gaap:SubsequentEventMember2022-07-152022-07-150000092122so:SouthernCompanyGasMemberso:InvestingInIllinoisMember2022-01-012022-06-300000092122so:SAVEMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:SystemReinforcementRiderMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:PipelineReplacementProgramMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:SubsequentEventMemberso:SouthernCompanyGasMember2022-07-012022-07-010000092122so:ShareholderDerivativeLawsuitsMemberus-gaap:PendingLitigationMember2017-12-31so:claim0000092122so:ShareholderDerivativeLawsuitsMemberus-gaap:SettledLitigationMember2022-06-092022-06-090000092122us-gaap:PendingLitigationMemberso:ClassActionLawsuitMemberso:GeorgiaPowerMember2021-10-012021-10-310000092122us-gaap:PendingLitigationMemberso:ClassActionLawsuitMemberso:GeorgiaPowerMember2022-02-072022-02-070000092122us-gaap:PendingLitigationMemberso:ClassActionLawsuitMemberso:GeorgiaPowerMember2022-03-090000092122so:MississippiPowerMemberus-gaap:PendingLitigationMemberso:PurportedViolationsOfMississippiConsumerProtectionActMember2018-01-012018-12-31so:plaintiffso:defendant0000092122so:MississippiPowerMemberus-gaap:PendingLitigationMemberso:PurportedViolationsOfMississippiConsumerProtectionActMember2019-03-012019-03-310000092122so:GulfPowerMemberus-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember2019-01-012019-12-310000092122us-gaap:SubsequentEventMemberso:GulfPowerMemberus-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember2022-07-122022-07-120000092122so:MississippiPowerMemberus-gaap:SubsequentEventMemberso:PlantDanielUnits1And2Member2022-07-120000092122so:PlantDanielUnitPrimaryMemberso:MississippiPowerMemberus-gaap:SubsequentEventMember2022-07-120000092122so:GulfPowerMemberus-gaap:SubsequentEventMemberso:PlantDanielUnits1And2Member2022-07-122022-07-120000092122so:MississippiPowerMembersrt:ScenarioForecastMemberso:PlantDanielUnits1And2Member2019-01-152024-01-150000092122so:RetailElectricResidentialMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricResidentialMember2022-04-012022-06-300000092122so:RetailElectricResidentialMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricResidentialMember2022-04-012022-06-300000092122so:RetailElectricResidentialMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:RetailElectricResidentialMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:RetailElectricCommercialMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricCommercialMember2022-04-012022-06-300000092122so:RetailElectricCommercialMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricCommercialMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:RetailElectricCommercialMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricCommercialMember2022-04-012022-06-300000092122so:RetailElectricIndustrialMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricIndustrialMember2022-04-012022-06-300000092122so:GeorgiaPowerMemberso:RetailElectricIndustrialMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricIndustrialMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:RetailElectricIndustrialMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricIndustrialMember2022-04-012022-06-300000092122so:RetailElectricOtherMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricOtherMember2022-04-012022-06-300000092122so:RetailElectricOtherMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricOtherMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:RetailElectricOtherMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricOtherMember2022-04-012022-06-300000092122so:RetailElectricMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricMember2022-04-012022-06-300000092122so:GeorgiaPowerMemberso:RetailElectricMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:RetailElectricMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricMember2022-04-012022-06-300000092122so:NaturalGasDistributionResidentialMember2022-04-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:AlabamaPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:MississippiPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:NaturalGasDistributionCommercialMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionCommercialMember2022-04-012022-06-300000092122so:NaturalGasDistributionCommercialMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionCommercialMember2022-04-012022-06-300000092122so:NaturalGasDistributionCommercialMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionCommercialMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:NaturalGasDistributionTransportationMember2022-04-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:AlabamaPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:MississippiPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:NaturalGasDistributionIndustrialMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionIndustrialMember2022-04-012022-06-300000092122so:NaturalGasDistributionIndustrialMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionIndustrialMember2022-04-012022-06-300000092122so:NaturalGasDistributionIndustrialMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:NaturalGasDistributionIndustrialMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:NaturalGasDistributionOtherMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionOtherMember2022-04-012022-06-300000092122so:NaturalGasDistributionOtherMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionOtherMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:NaturalGasDistributionOtherMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:NaturalGasDistributionOtherMember2022-04-012022-06-300000092122so:NaturalGasDistributionMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionMember2022-04-012022-06-300000092122so:NaturalGasDistributionMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:NaturalGasDistributionMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:NaturalGasDistributionMember2022-04-012022-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricPPAEnergyRevenuesMember2022-04-012022-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:WholesaleElectricPPAEnergyRevenuesMember2022-04-012022-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:WholesaleElectricPPACapacityRevenuesMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricPPACapacityRevenuesMember2022-04-012022-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:WholesaleElectricPPACapacityRevenuesMember2022-04-012022-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:WholesaleElectricNonPPARevenuesMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricNonPPARevenuesMember2022-04-012022-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:WholesaleElectricNonPPARevenuesMember2022-04-012022-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:WholesaleElectricRevenuesMember2022-04-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:AlabamaPowerMember2022-04-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:MississippiPowerMember2022-04-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:OtherNaturalGasGasMarketingServicesMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasGasMarketingServicesMember2022-04-012022-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasGasMarketingServicesMember2022-04-012022-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:OtherNaturalGasOtherNaturalGasRevenuesMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-04-012022-06-300000092122so:GeorgiaPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-04-012022-06-300000092122so:OtherNaturalGasMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasMember2022-04-012022-06-300000092122so:GeorgiaPowerMemberso:OtherNaturalGasMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasMember2022-04-012022-06-300000092122so:OtherRevenuesMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:OtherRevenuesMember2022-04-012022-06-300000092122so:OtherRevenuesMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:OtherRevenuesMember2022-04-012022-06-300000092122so:OtherRevenuesMemberso:SouthernPowerMember2022-04-012022-06-300000092122so:OtherRevenuesMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:OtherRevenueSourcesMember2022-04-012022-06-300000092122so:AlabamaPowerMemberso:OtherRevenueSourcesMember2022-04-012022-06-300000092122so:OtherRevenueSourcesMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberso:OtherRevenueSourcesMember2022-04-012022-06-300000092122so:SouthernPowerMemberso:OtherRevenueSourcesMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:OtherRevenueSourcesMember2022-04-012022-06-300000092122so:RetailElectricResidentialMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricResidentialMember2022-01-012022-06-300000092122so:RetailElectricResidentialMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricResidentialMember2022-01-012022-06-300000092122so:RetailElectricResidentialMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:RetailElectricResidentialMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:RetailElectricCommercialMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricCommercialMember2022-01-012022-06-300000092122so:RetailElectricCommercialMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricCommercialMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:RetailElectricCommercialMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricCommercialMember2022-01-012022-06-300000092122so:RetailElectricIndustrialMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricIndustrialMember2022-01-012022-06-300000092122so:GeorgiaPowerMemberso:RetailElectricIndustrialMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricIndustrialMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:RetailElectricIndustrialMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricIndustrialMember2022-01-012022-06-300000092122so:RetailElectricOtherMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricOtherMember2022-01-012022-06-300000092122so:RetailElectricOtherMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricOtherMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:RetailElectricOtherMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricOtherMember2022-01-012022-06-300000092122so:RetailElectricMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:RetailElectricMember2022-01-012022-06-300000092122so:GeorgiaPowerMemberso:RetailElectricMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:RetailElectricMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:RetailElectricMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricMember2022-01-012022-06-300000092122so:NaturalGasDistributionResidentialMember2022-01-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:AlabamaPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:MississippiPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionResidentialMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:NaturalGasDistributionCommercialMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionCommercialMember2022-01-012022-06-300000092122so:NaturalGasDistributionCommercialMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionCommercialMember2022-01-012022-06-300000092122so:NaturalGasDistributionCommercialMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionCommercialMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:NaturalGasDistributionTransportationMember2022-01-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:AlabamaPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:MississippiPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionTransportationMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:NaturalGasDistributionIndustrialMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionIndustrialMember2022-01-012022-06-300000092122so:NaturalGasDistributionIndustrialMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionIndustrialMember2022-01-012022-06-300000092122so:NaturalGasDistributionIndustrialMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:NaturalGasDistributionIndustrialMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:NaturalGasDistributionOtherMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionOtherMember2022-01-012022-06-300000092122so:NaturalGasDistributionOtherMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionOtherMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:NaturalGasDistributionOtherMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:NaturalGasDistributionOtherMember2022-01-012022-06-300000092122so:NaturalGasDistributionMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionMember2022-01-012022-06-300000092122so:NaturalGasDistributionMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:NaturalGasDistributionMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:NaturalGasDistributionMember2022-01-012022-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricPPAEnergyRevenuesMember2022-01-012022-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:WholesaleElectricPPAEnergyRevenuesMember2022-01-012022-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:WholesaleElectricPPACapacityRevenuesMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricPPACapacityRevenuesMember2022-01-012022-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:WholesaleElectricPPACapacityRevenuesMember2022-01-012022-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:WholesaleElectricNonPPARevenuesMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricNonPPARevenuesMember2022-01-012022-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:WholesaleElectricNonPPARevenuesMember2022-01-012022-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:WholesaleElectricRevenuesMember2022-01-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:AlabamaPowerMember2022-01-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:MississippiPowerMember2022-01-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:WholesaleElectricRevenuesMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:OtherNaturalGasGasMarketingServicesMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasGasMarketingServicesMember2022-01-012022-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasGasMarketingServicesMember2022-01-012022-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:OtherNaturalGasOtherNaturalGasRevenuesMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-01-012022-06-300000092122so:GeorgiaPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2022-01-012022-06-300000092122so:OtherNaturalGasMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasMember2022-01-012022-06-300000092122so:GeorgiaPowerMemberso:OtherNaturalGasMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasMember2022-01-012022-06-300000092122so:OtherRevenuesMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:OtherRevenuesMember2022-01-012022-06-300000092122so:OtherRevenuesMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:OtherRevenuesMember2022-01-012022-06-300000092122so:OtherRevenuesMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:OtherRevenuesMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:OtherRevenueSourcesMember2022-01-012022-06-300000092122so:AlabamaPowerMemberso:OtherRevenueSourcesMember2022-01-012022-06-300000092122so:OtherRevenueSourcesMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberso:OtherRevenueSourcesMember2022-01-012022-06-300000092122so:SouthernPowerMemberso:OtherRevenueSourcesMember2022-01-012022-06-300000092122so:SouthernCompanyGasMemberso:OtherRevenueSourcesMember2022-01-012022-06-300000092122so:RetailElectricResidentialMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricResidentialMember2021-04-012021-06-300000092122so:RetailElectricResidentialMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricResidentialMember2021-04-012021-06-300000092122so:RetailElectricResidentialMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:RetailElectricResidentialMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:RetailElectricCommercialMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricCommercialMember2021-04-012021-06-300000092122so:RetailElectricCommercialMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricCommercialMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:RetailElectricCommercialMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricCommercialMember2021-04-012021-06-300000092122so:RetailElectricIndustrialMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricIndustrialMember2021-04-012021-06-300000092122so:GeorgiaPowerMemberso:RetailElectricIndustrialMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricIndustrialMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:RetailElectricIndustrialMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricIndustrialMember2021-04-012021-06-300000092122so:RetailElectricOtherMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricOtherMember2021-04-012021-06-300000092122so:RetailElectricOtherMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricOtherMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:RetailElectricOtherMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricOtherMember2021-04-012021-06-300000092122so:RetailElectricMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricMember2021-04-012021-06-300000092122so:GeorgiaPowerMemberso:RetailElectricMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:RetailElectricMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricMember2021-04-012021-06-300000092122so:NaturalGasDistributionResidentialMember2021-04-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:AlabamaPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:MississippiPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:NaturalGasDistributionCommercialMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionCommercialMember2021-04-012021-06-300000092122so:NaturalGasDistributionCommercialMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionCommercialMember2021-04-012021-06-300000092122so:NaturalGasDistributionCommercialMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionCommercialMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:NaturalGasDistributionTransportationMember2021-04-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:AlabamaPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:MississippiPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:NaturalGasDistributionIndustrialMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionIndustrialMember2021-04-012021-06-300000092122so:NaturalGasDistributionIndustrialMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionIndustrialMember2021-04-012021-06-300000092122so:NaturalGasDistributionIndustrialMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:NaturalGasDistributionIndustrialMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:NaturalGasDistributionOtherMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionOtherMember2021-04-012021-06-300000092122so:NaturalGasDistributionOtherMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionOtherMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:NaturalGasDistributionOtherMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:NaturalGasDistributionOtherMember2021-04-012021-06-300000092122so:NaturalGasDistributionMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionMember2021-04-012021-06-300000092122so:NaturalGasDistributionMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:NaturalGasDistributionMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:NaturalGasDistributionMember2021-04-012021-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricPPAEnergyRevenuesMember2021-04-012021-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:WholesaleElectricPPAEnergyRevenuesMember2021-04-012021-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:WholesaleElectricPPACapacityRevenuesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricPPACapacityRevenuesMember2021-04-012021-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:WholesaleElectricPPACapacityRevenuesMember2021-04-012021-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:WholesaleElectricNonPPARevenuesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricNonPPARevenuesMember2021-04-012021-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:WholesaleElectricNonPPARevenuesMember2021-04-012021-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:WholesaleElectricRevenuesMember2021-04-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:AlabamaPowerMember2021-04-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:MississippiPowerMember2021-04-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:OtherNaturalGasWholesaleGasServicesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasWholesaleGasServicesMember2021-04-012021-06-300000092122so:OtherNaturalGasWholesaleGasServicesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasWholesaleGasServicesMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasWholesaleGasServicesMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasWholesaleGasServicesMember2021-04-012021-06-300000092122so:OtherNaturalGasGasMarketingServicesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasGasMarketingServicesMember2021-04-012021-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasGasMarketingServicesMember2021-04-012021-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:OtherNaturalGasOtherNaturalGasRevenuesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-04-012021-06-300000092122so:GeorgiaPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-04-012021-06-300000092122so:OtherNaturalGasMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasMember2021-04-012021-06-300000092122so:GeorgiaPowerMemberso:OtherNaturalGasMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasMember2021-04-012021-06-300000092122so:OtherRevenuesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:OtherRevenuesMember2021-04-012021-06-300000092122so:OtherRevenuesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:OtherRevenuesMember2021-04-012021-06-300000092122so:OtherRevenuesMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:OtherRevenuesMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:OtherRevenueSourcesMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:OtherRevenueSourcesMember2021-04-012021-06-300000092122so:OtherRevenueSourcesMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:OtherRevenueSourcesMember2021-04-012021-06-300000092122so:SouthernPowerMemberso:OtherRevenueSourcesMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:OtherRevenueSourcesMember2021-04-012021-06-300000092122so:OtherAdjustmentsMember2021-04-012021-06-300000092122so:AlabamaPowerMemberso:OtherAdjustmentsMember2021-04-012021-06-300000092122so:OtherAdjustmentsMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberso:OtherAdjustmentsMember2021-04-012021-06-300000092122so:OtherAdjustmentsMemberso:SouthernPowerMember2021-04-012021-06-300000092122so:OtherAdjustmentsMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:RetailElectricResidentialMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricResidentialMember2021-01-012021-06-300000092122so:RetailElectricResidentialMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricResidentialMember2021-01-012021-06-300000092122so:RetailElectricResidentialMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:RetailElectricResidentialMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:RetailElectricCommercialMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricCommercialMember2021-01-012021-06-300000092122so:RetailElectricCommercialMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricCommercialMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:RetailElectricCommercialMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricCommercialMember2021-01-012021-06-300000092122so:RetailElectricIndustrialMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricIndustrialMember2021-01-012021-06-300000092122so:GeorgiaPowerMemberso:RetailElectricIndustrialMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricIndustrialMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:RetailElectricIndustrialMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricIndustrialMember2021-01-012021-06-300000092122so:RetailElectricOtherMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricOtherMember2021-01-012021-06-300000092122so:RetailElectricOtherMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricOtherMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:RetailElectricOtherMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricOtherMember2021-01-012021-06-300000092122so:RetailElectricMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:RetailElectricMember2021-01-012021-06-300000092122so:GeorgiaPowerMemberso:RetailElectricMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:RetailElectricMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:RetailElectricMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:RetailElectricMember2021-01-012021-06-300000092122so:NaturalGasDistributionResidentialMember2021-01-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:AlabamaPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:MississippiPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionResidentialMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:NaturalGasDistributionCommercialMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionCommercialMember2021-01-012021-06-300000092122so:NaturalGasDistributionCommercialMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionCommercialMember2021-01-012021-06-300000092122so:NaturalGasDistributionCommercialMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionCommercialMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:NaturalGasDistributionTransportationMember2021-01-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:AlabamaPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:MississippiPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionTransportationMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:NaturalGasDistributionIndustrialMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionIndustrialMember2021-01-012021-06-300000092122so:NaturalGasDistributionIndustrialMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionIndustrialMember2021-01-012021-06-300000092122so:NaturalGasDistributionIndustrialMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:NaturalGasDistributionIndustrialMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:NaturalGasDistributionOtherMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionOtherMember2021-01-012021-06-300000092122so:NaturalGasDistributionOtherMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionOtherMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:NaturalGasDistributionOtherMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:NaturalGasDistributionOtherMember2021-01-012021-06-300000092122so:NaturalGasDistributionMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:NaturalGasDistributionMember2021-01-012021-06-300000092122so:NaturalGasDistributionMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:NaturalGasDistributionMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:NaturalGasDistributionMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:NaturalGasDistributionMember2021-01-012021-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricPPAEnergyRevenuesMember2021-01-012021-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:WholesaleElectricPPAEnergyRevenuesMember2021-01-012021-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:WholesaleElectricPPAEnergyRevenuesMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:WholesaleElectricPPACapacityRevenuesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricPPACapacityRevenuesMember2021-01-012021-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:WholesaleElectricPPACapacityRevenuesMember2021-01-012021-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:WholesaleElectricPPACapacityRevenuesMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:WholesaleElectricNonPPARevenuesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:WholesaleElectricNonPPARevenuesMember2021-01-012021-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:WholesaleElectricNonPPARevenuesMember2021-01-012021-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:WholesaleElectricNonPPARevenuesMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:WholesaleElectricRevenuesMember2021-01-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:AlabamaPowerMember2021-01-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:MississippiPowerMember2021-01-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:WholesaleElectricRevenuesMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:OtherNaturalGasWholesaleGasServicesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasWholesaleGasServicesMember2021-01-012021-06-300000092122so:OtherNaturalGasWholesaleGasServicesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasWholesaleGasServicesMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasWholesaleGasServicesMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasWholesaleGasServicesMember2021-01-012021-06-300000092122so:OtherNaturalGasGasMarketingServicesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasGasMarketingServicesMember2021-01-012021-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasGasMarketingServicesMember2021-01-012021-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:OtherNaturalGasGasMarketingServicesMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:OtherNaturalGasOtherNaturalGasRevenuesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-01-012021-06-300000092122so:GeorgiaPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasOtherNaturalGasRevenuesMember2021-01-012021-06-300000092122so:OtherNaturalGasMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:OtherNaturalGasMember2021-01-012021-06-300000092122so:GeorgiaPowerMemberso:OtherNaturalGasMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:OtherNaturalGasMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:OtherNaturalGasMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:OtherNaturalGasMember2021-01-012021-06-300000092122so:OtherRevenuesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:OtherRevenuesMember2021-01-012021-06-300000092122so:OtherRevenuesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:OtherRevenuesMember2021-01-012021-06-300000092122so:OtherRevenuesMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:OtherRevenuesMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:OtherRevenueSourcesMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:OtherRevenueSourcesMember2021-01-012021-06-300000092122so:OtherRevenueSourcesMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:OtherRevenueSourcesMember2021-01-012021-06-300000092122so:SouthernPowerMemberso:OtherRevenueSourcesMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:OtherRevenueSourcesMember2021-01-012021-06-300000092122so:OtherAdjustmentsMember2021-01-012021-06-300000092122so:AlabamaPowerMemberso:OtherAdjustmentsMember2021-01-012021-06-300000092122so:OtherAdjustmentsMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberso:OtherAdjustmentsMember2021-01-012021-06-300000092122so:OtherAdjustmentsMemberso:SouthernPowerMember2021-01-012021-06-300000092122so:OtherAdjustmentsMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:UnregulatedDistributedGenerationMember2022-06-300000092122so:UnregulatedDistributedGenerationMember2021-12-3100000921222022-07-012022-06-3000000921222023-01-012022-06-3000000921222024-01-012022-06-3000000921222025-01-012022-06-3000000921222026-01-012022-06-3000000921222027-01-012022-06-300000092122so:AlabamaPowerMember2022-07-012022-06-300000092122so:AlabamaPowerMember2023-01-012022-06-300000092122so:AlabamaPowerMember2024-01-012022-06-300000092122so:AlabamaPowerMember2025-01-012022-06-300000092122so:AlabamaPowerMember2026-01-012022-06-3000000921222027-01-01so:AlabamaPowerMember2022-06-3000000921222022-07-01so:GeorgiaPowerMember2022-06-300000092122so:GeorgiaPowerMember2023-01-012022-06-3000000921222024-01-01so:GeorgiaPowerMember2022-06-3000000921222025-01-01so:GeorgiaPowerMember2022-06-3000000921222026-01-01so:GeorgiaPowerMember2022-06-3000000921222027-01-01so:GeorgiaPowerMember2022-06-3000000921222022-07-01so:SouthernPowerMember2022-06-300000092122so:SouthernPowerMember2023-01-012022-06-3000000921222024-01-01so:SouthernPowerMember2022-06-300000092122so:SouthernPowerMember2025-01-012022-06-3000000921222026-01-01so:SouthernPowerMember2022-06-3000000921222027-01-01so:SouthernPowerMember2022-06-3000000921222022-07-01so:SouthernCompanyGasMember2022-06-300000092122so:SouthernCompanyGasMember2023-01-012022-06-3000000921222024-01-01so:SouthernCompanyGasMember2022-06-300000092122so:SouthernCompanyGasMember2025-01-012022-06-3000000921222026-01-01so:SouthernCompanyGasMember2022-06-3000000921222027-01-01so:SouthernCompanyGasMember2022-06-300000092122us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberso:SPSolarHoldingsILPMemberso:SouthernPowerMember2022-06-300000092122us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberso:SPSolarHoldingsILPMemberso:SouthernPowerMember2021-12-310000092122so:SPSolarHoldingsILPMemberso:SouthernPowerMember2022-01-012022-06-300000092122so:SPSolarHoldingsILPMemberso:GlobalAtlanticMember2022-01-012022-06-300000092122us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberso:SPWindMemberso:SouthernPowerMember2021-12-310000092122us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberso:SPWindMemberso:SouthernPowerMember2022-06-300000092122us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberso:SPWindMemberso:SouthernPowerMember2022-01-012022-06-300000092122us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberso:SPWindMemberso:FinancialInvestorsMember2022-01-012022-06-30so:investor0000092122us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberso:OtherVariableInterestEntitiesMemberso:SouthernPowerMember2022-06-300000092122us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberso:OtherVariableInterestEntitiesMemberso:SouthernPowerMember2021-12-310000092122so:SNGMemberso:SouthernCompanyGasMember2022-06-300000092122so:SNGMemberso:SouthernCompanyGasMember2021-12-310000092122so:OtherMemberso:SouthernCompanyGasMember2022-06-300000092122so:OtherMemberso:SouthernCompanyGasMember2021-12-310000092122so:SouthernCompanyGasMemberso:PennEastPipelinesMember2022-01-012022-06-300000092122so:SNGMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:SNGMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:SNGMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:SNGMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:SouthernCompanyGasMemberso:PennEastPipelinesMember2022-04-012022-06-300000092122so:SouthernCompanyGasMemberso:PennEastPipelinesMember2021-04-012021-06-300000092122so:SouthernCompanyGasMemberso:PennEastPipelinesMember2021-01-012021-06-300000092122so:OtherMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122so:OtherMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122so:OtherMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122so:OtherMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122so:SouthernCompanyMember2022-06-300000092122so:SouthernElectricGeneratingCompanyMember2022-06-30so:letter_of_credit0000092122so:ContinuingLetterOfCreditFacilityAMemberso:SouthernPowerMember2022-06-300000092122so:ContinuingLetterOfCreditFacilityBMemberso:SouthernPowerMember2022-06-300000092122so:SouthernCompanyGasCapitalMember2022-06-300000092122so:NicorGasMember2022-06-300000092122so:MississippiPowerMemberus-gaap:LineOfCreditMemberus-gaap:RevolvingCreditFacilityMember2022-03-310000092122so:Series2019ARemarketableJuniorSubordinatedNotesMemberus-gaap:JuniorSubordinatedDebtMember2022-05-310000092122so:Series2019BRemarketableJuniorSubordinatedNotesMemberus-gaap:JuniorSubordinatedDebtMember2022-05-310000092122srt:ScenarioForecastMemberso:A2019SeriesAEquityUnitsMemberus-gaap:JuniorSubordinatedDebtMember2022-08-012022-08-010000092122us-gaap:SubsequentEventMembersrt:RestatementAdjustmentMember2022-07-270000092122us-gaap:InvestmentCreditMember2022-06-300000092122us-gaap:InvestmentCreditMember2021-12-310000092122us-gaap:PensionPlansDefinedBenefitMember2022-06-300000092122us-gaap:PensionPlansDefinedBenefitMember2022-04-012022-06-300000092122so:AlabamaPowerMemberus-gaap:PensionPlansDefinedBenefitMember2022-04-012022-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberus-gaap:PensionPlansDefinedBenefitMember2022-04-012022-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:SouthernPowerMember2022-04-012022-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-04-012022-06-300000092122so:AlabamaPowerMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-04-012022-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122so:MississippiPowerMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-04-012022-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:SouthernPowerMember2022-04-012022-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122us-gaap:PensionPlansDefinedBenefitMember2022-01-012022-06-300000092122so:AlabamaPowerMemberus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:SouthernPowerMember2022-01-012022-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-06-300000092122so:AlabamaPowerMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122so:MississippiPowerMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:SouthernPowerMember2022-01-012022-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:PensionPlansDefinedBenefitMember2021-04-012021-06-300000092122so:AlabamaPowerMemberus-gaap:PensionPlansDefinedBenefitMember2021-04-012021-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberus-gaap:PensionPlansDefinedBenefitMember2021-04-012021-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:SouthernPowerMember2021-04-012021-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-04-012021-06-300000092122so:AlabamaPowerMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-04-012021-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122so:MississippiPowerMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-04-012021-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:SouthernPowerMember2021-04-012021-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122us-gaap:PensionPlansDefinedBenefitMember2021-01-012021-06-300000092122so:AlabamaPowerMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:SouthernPowerMember2021-01-012021-06-300000092122us-gaap:PensionPlansDefinedBenefitMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-06-300000092122so:AlabamaPowerMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122so:MississippiPowerMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:SouthernPowerMember2021-01-012021-06-300000092122us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2022-06-300000092122us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:MunicipalBondsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FixedIncomeFundsMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FixedIncomeFundsMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-06-300000092122us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:InterestRateContractMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:InterestRateContractMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:AlabamaPowerMemberso:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:AlabamaPowerMemberso:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberso:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberso:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberso:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:AlabamaPowerMemberso:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberso:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberso:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2022-06-300000092122us-gaap:MunicipalBondsMemberso:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:MunicipalBondsMemberso:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:MunicipalBondsMemberso:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:MunicipalBondsMemberso:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EnergyRelatedDerivativeMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EnergyRelatedDerivativeMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMemberso:GeorgiaPowerMember2022-06-300000092122so:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberso:GeorgiaPowerMember2022-06-300000092122so:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122so:DomesticEquityMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122so:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberso:GeorgiaPowerMember2022-06-300000092122so:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122so:ForeignEquityMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:MunicipalBondsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:MunicipalBondsMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberso:GeorgiaPowerMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberso:GeorgiaPowerMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000092122us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:OtherThanSecuritiesInvestmentMemberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:FairValueMeasurementsRecurringMemberso:GeorgiaPowerMember2022-06-300000092122so:MississippiPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:MississippiPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:MississippiPowerMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:MississippiPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ForeignExchangeContractMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:SouthernPowerMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:SouthernPowerMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122so:DomesticEquityMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:DomesticEquityMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:DomesticEquityMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:DomesticEquityMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:ForeignEquityMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:ForeignEquityMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:ForeignEquityMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:ForeignEquityMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FixedIncomeFundsMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FixedIncomeFundsMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FixedIncomeFundsMember2022-06-300000092122us-gaap:CashEquivalentsMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122us-gaap:CashEquivalentsMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberus-gaap:CashEquivalentsMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122us-gaap:CashEquivalentsMemberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:InterestRateContractMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:InterestRateContractMember2022-06-300000092122us-gaap:FairValueInputsLevel3Memberso:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2022-06-300000092122so:SouthernCompanyGasMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:PrivateEquityFundsMember2022-06-300000092122us-gaap:PublicUtilitiesInventoryNaturalGasMember2022-06-30utr:MMBTU0000092122so:AlabamaPowerMemberus-gaap:PublicUtilitiesInventoryNaturalGasMember2022-06-300000092122us-gaap:PublicUtilitiesInventoryNaturalGasMemberso:GeorgiaPowerMember2022-06-300000092122so:MississippiPowerMemberus-gaap:PublicUtilitiesInventoryNaturalGasMember2022-06-300000092122us-gaap:PublicUtilitiesInventoryNaturalGasMemberso:SouthernPowerMember2022-06-300000092122us-gaap:PublicUtilitiesInventoryNaturalGasMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:LongMemberus-gaap:NondesignatedMemberus-gaap:PublicUtilitiesInventoryNaturalGasMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:NondesignatedMemberus-gaap:ShortMemberus-gaap:PublicUtilitiesInventoryNaturalGasMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:InterestRateContractMemberso:AlabamaPowerMemberso:CashFlowHedgesOfExistingDebtMember2022-06-300000092122us-gaap:InterestRateContractMemberso:AlabamaPowerMemberso:CashFlowHedgesOfExistingDebtMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMemberso:SouthernCompanyGasMemberso:CashFlowHedgesOfExistingDebtMember2022-06-300000092122us-gaap:InterestRateContractMemberso:SouthernCompanyGasMemberso:CashFlowHedgesOfExistingDebtMember2022-01-012022-06-300000092122so:SouthernCompanyMemberus-gaap:InterestRateContractMemberso:HedgingMaturityDateOneMemberso:FairValueHedgesOfExistingDebtMember2022-06-300000092122so:SouthernCompanyMemberus-gaap:InterestRateContractMemberso:HedgingMaturityDateOneMemberso:FairValueHedgesOfExistingDebtMember2022-01-012022-06-300000092122so:SouthernCompanyMemberus-gaap:InterestRateContractMemberso:HedgingMaturityDateOneMemberso:FairValueHedgesOfExistingDebtMemberus-gaap:LondonInterbankOfferedRateLIBORMember2022-01-012022-06-300000092122so:SouthernCompanyMemberus-gaap:InterestRateContractMemberso:FairValueHedgesOfExistingDebtMemberso:HedgingMaturityDateTwoMember2022-06-300000092122so:SouthernCompanyMemberus-gaap:InterestRateContractMemberso:FairValueHedgesOfExistingDebtMemberso:HedgingMaturityDateTwoMember2022-01-012022-06-300000092122so:SouthernCompanyMemberus-gaap:InterestRateContractMemberso:FairValueHedgesOfExistingDebtMemberus-gaap:LondonInterbankOfferedRateLIBORMemberso:HedgingMaturityDateTwoMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMemberso:FairValueHedgesOfExistingDebtMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:InterestRateContractMemberso:FairValueHedgesOfExistingDebtMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMemberso:FairValueHedgesOfExistingDebtMemberus-gaap:LondonInterbankOfferedRateLIBORMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMember2022-06-300000092122so:SouthernCompanyMemberso:FairValueHedgesOfExistingDebtMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122so:SouthernCompanyMemberso:FairValueHedgesOfExistingDebtMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-30iso4217:EUR0000092122so:HedgingMaturityDateTwoMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMemberso:CashFlowHedgesOfExistingDebtMember2022-06-300000092122so:HedgingMaturityDateTwoMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMemberso:CashFlowHedgesOfExistingDebtMember2022-01-012022-06-300000092122us-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:InterestRateContractMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMemberus-gaap:ForeignExchangeContractMember2021-12-310000092122us-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberus-gaap:ForeignExchangeContractMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberus-gaap:ForeignExchangeContractMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberus-gaap:ForeignExchangeContractMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:AssetsFromRiskManagementActivitiesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:NondesignatedMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:AssetsFromRiskManagementActivitiesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:NondesignatedMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredChargesAndAssetsMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredCreditsAndLiabilitiesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredChargesAndAssetsMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredCreditsAndLiabilitiesMember2021-12-310000092122us-gaap:NondesignatedMember2022-06-300000092122us-gaap:NondesignatedMember2021-12-310000092122us-gaap:OtherCurrentAssetsMemberus-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:OtherCurrentAssetsMemberus-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122so:AlabamaPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122so:AlabamaPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:GeorgiaPowerMember2021-12-310000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122so:MississippiPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2022-06-300000092122so:MississippiPowerMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMember2021-12-310000092122us-gaap:OtherCurrentAssetsMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2022-06-300000092122us-gaap:OtherCurrentAssetsMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2021-12-310000092122us-gaap:OtherCurrentAssetsMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:OtherCurrentAssetsMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-12-310000092122us-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernPowerMember2021-12-310000092122us-gaap:OtherCurrentAssetsMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:SouthernPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:NondesignatedMemberso:SouthernPowerMember2022-06-300000092122us-gaap:OtherCurrentAssetsMemberus-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:SouthernPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:NondesignatedMemberso:SouthernPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredChargesAndAssetsMemberso:SouthernPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:SouthernPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredChargesAndAssetsMemberso:SouthernPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:SouthernPowerMember2021-12-310000092122us-gaap:NondesignatedMemberso:SouthernPowerMember2022-06-300000092122us-gaap:NondesignatedMemberso:SouthernPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:HedgingInstrumentsForRegulatoryPurposesMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:InterestRateContractMemberso:LiabilitiesFromRiskManagementActivitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:AssetsFromRiskManagementActivitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:InterestRateContractMemberso:LiabilitiesFromRiskManagementActivitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredChargesAndAssetsMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:DesignatedAsHedgingInstrumentMemberso:CashFlowAndFairValueHedgingMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:AssetsFromRiskManagementActivitiesMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:NondesignatedMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:AssetsFromRiskManagementActivitiesMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:NondesignatedMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredChargesAndAssetsMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredChargesAndAssetsMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:NondesignatedMemberso:OtherDeferredCreditsAndLiabilitiesMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:NondesignatedMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:NondesignatedMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryAssetsCurrentMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberso:OtherRegulatoryAssetsCurrentMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:GeorgiaPowerMemberso:OtherRegulatoryAssetsCurrentMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryAssetsCurrentMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:SouthernCompanyGasMemberso:OtherRegulatoryAssetsCurrentMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryAssetsDeferredMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberso:OtherRegulatoryAssetsDeferredMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryAssetsDeferredMemberso:GeorgiaPowerMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryAssetsDeferredMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryAssetsDeferredMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesCurrentMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberso:OtherRegulatoryLiabilitiesCurrentMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesCurrentMemberso:GeorgiaPowerMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesCurrentMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesCurrentMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesDeferredMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberso:OtherRegulatoryLiabilitiesDeferredMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesDeferredMemberso:GeorgiaPowerMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesDeferredMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:SouthernCompanyGasMemberso:OtherRegulatoryLiabilitiesDeferredMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:GeorgiaPowerMember2022-06-300000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:SouthernCompanyGasMember2022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryAssetsCurrentMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberso:OtherRegulatoryAssetsCurrentMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:GeorgiaPowerMemberso:OtherRegulatoryAssetsCurrentMember2021-12-310000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryAssetsCurrentMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:SouthernCompanyGasMemberso:OtherRegulatoryAssetsCurrentMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesCurrentMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberso:OtherRegulatoryLiabilitiesCurrentMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesCurrentMemberso:GeorgiaPowerMember2021-12-310000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesCurrentMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesCurrentMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesDeferredMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMemberso:OtherRegulatoryLiabilitiesDeferredMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesDeferredMemberso:GeorgiaPowerMember2021-12-310000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMemberso:OtherRegulatoryLiabilitiesDeferredMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:SouthernCompanyGasMemberso:OtherRegulatoryLiabilitiesDeferredMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:AlabamaPowerMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:GeorgiaPowerMember2021-12-310000092122so:MississippiPowerMemberus-gaap:EnergyRelatedDerivativeMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberso:SouthernCompanyGasMember2021-12-310000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMember2022-04-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMember2021-04-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMember2022-01-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMember2021-01-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMember2022-04-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMember2021-04-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMember2021-01-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMember2021-01-012021-06-300000092122us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000092122us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-300000092122us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-300000092122us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMember2021-01-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberso:GeorgiaPowerMember2022-04-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberso:GeorgiaPowerMember2021-04-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberso:GeorgiaPowerMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberso:GeorgiaPowerMember2021-01-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernPowerMember2022-04-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernPowerMember2021-04-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernPowerMember2022-01-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernPowerMember2021-01-012021-06-300000092122us-gaap:CashFlowHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000092122us-gaap:CashFlowHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-300000092122us-gaap:CashFlowHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-300000092122us-gaap:CashFlowHedgingMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-01-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberso:SouthernCompanyGasMember2022-04-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberso:SouthernCompanyGasMember2021-04-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberso:SouthernCompanyGasMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberso:SouthernCompanyGasMember2021-01-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberus-gaap:CostOfSalesMember2022-04-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberus-gaap:CostOfSalesMember2022-01-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:DepreciationandAmortizationMember2022-04-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:DepreciationandAmortizationMember2021-04-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:DepreciationandAmortizationMember2022-01-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:DepreciationandAmortizationMember2021-01-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMember2022-04-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMember2021-04-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMember2021-01-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMemberus-gaap:ForeignExchangeContractMember2021-01-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMember2022-04-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMember2021-04-012021-06-300000092122us-gaap:InterestRateContractMemberus-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMember2022-01-012022-06-300000092122us-gaap:InterestRateContractMemberus-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMember2021-01-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2021-01-012021-06-300000092122us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueHedgingMember2022-04-012022-06-300000092122us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueHedgingMember2021-04-012021-06-300000092122us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueHedgingMember2022-01-012022-06-300000092122us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueHedgingMember2021-01-012021-06-300000092122us-gaap:OtherNonoperatingIncomeExpenseMember2022-04-012022-06-300000092122us-gaap:OtherNonoperatingIncomeExpenseMember2021-04-012021-06-300000092122us-gaap:OtherNonoperatingIncomeExpenseMember2022-01-012022-06-300000092122us-gaap:OtherNonoperatingIncomeExpenseMember2021-01-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernPowerMemberso:DepreciationandAmortizationMember2022-04-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernPowerMemberso:DepreciationandAmortizationMember2021-04-012021-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernPowerMemberso:DepreciationandAmortizationMember2022-01-012022-06-300000092122us-gaap:EnergyRelatedDerivativeMemberus-gaap:CashFlowHedgingMemberso:SouthernPowerMemberso:DepreciationandAmortizationMember2021-01-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:InterestExpenseMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-01-012021-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:OtherNonoperatingIncomeExpenseMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000092122us-gaap:CashFlowHedgingMemberus-gaap:OtherNonoperatingIncomeExpenseMemberso:SouthernPowerMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-30