000007274112/312022Q3FALSE000002342612/31000031525612/31000001337212/31http://fasb.org/us-gaap/2022#OtherAssetsNoncurrenthttp://fasb.org/us-gaap/2022#OtherAssetsNoncurrenthttp://fasb.org/us-gaap/2022#Revenueshttp://fasb.org/us-gaap/2022#Revenueshttp://fasb.org/us-gaap/2022#Revenueshttp://fasb.org/us-gaap/2022#Revenueshttp://fasb.org/us-gaap/2022#Revenueshttp://fasb.org/us-gaap/2022#Revenueshttp://fasb.org/us-gaap/2022#Revenueshttp://fasb.org/us-gaap/2022#Revenues00000727412022-01-012022-09-300000072741es:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:NstarElectricCompanyMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2022-01-012022-09-3000000727412022-10-31xbrli:shares0000072741es:TheConnecticutLightAndPowerCompanyMember2022-10-310000072741es:NstarElectricCompanyMember2022-10-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2022-10-3100000727412022-09-30iso4217:USD00000727412021-12-3100000727412022-07-012022-09-3000000727412021-07-012021-09-3000000727412021-01-012021-09-30iso4217:USDxbrli:shares0000072741us-gaap:CommonStockMember2021-12-310000072741us-gaap:AdditionalPaidInCapitalMember2021-12-310000072741us-gaap:RetainedEarningsMember2021-12-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000072741us-gaap:TreasuryStockMember2021-12-310000072741us-gaap:RetainedEarningsMember2022-01-012022-03-3100000727412022-01-012022-03-310000072741us-gaap:AdditionalPaidInCapitalMember2022-01-012022-03-310000072741us-gaap:CommonStockMember2022-01-012022-03-310000072741us-gaap:TreasuryStockMember2022-01-012022-03-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-03-310000072741us-gaap:CommonStockMember2022-03-310000072741us-gaap:AdditionalPaidInCapitalMember2022-03-310000072741us-gaap:RetainedEarningsMember2022-03-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-03-310000072741us-gaap:TreasuryStockMember2022-03-3100000727412022-03-310000072741us-gaap:RetainedEarningsMember2022-04-012022-06-3000000727412022-04-012022-06-3000000727412022-06-300000072741us-gaap:CommonStockMember2022-04-012022-06-300000072741us-gaap:AdditionalPaidInCapitalMember2022-04-012022-06-300000072741us-gaap:TreasuryStockMember2022-04-012022-06-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-04-012022-06-300000072741us-gaap:CommonStockMember2022-06-300000072741us-gaap:AdditionalPaidInCapitalMember2022-06-300000072741us-gaap:RetainedEarningsMember2022-06-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-300000072741us-gaap:TreasuryStockMember2022-06-300000072741us-gaap:RetainedEarningsMember2022-07-012022-09-300000072741us-gaap:CommonStockMember2022-07-012022-09-300000072741us-gaap:AdditionalPaidInCapitalMember2022-07-012022-09-300000072741us-gaap:TreasuryStockMember2022-07-012022-09-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-07-012022-09-300000072741us-gaap:CommonStockMember2022-09-300000072741us-gaap:AdditionalPaidInCapitalMember2022-09-300000072741us-gaap:RetainedEarningsMember2022-09-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-09-300000072741us-gaap:TreasuryStockMember2022-09-300000072741us-gaap:CommonStockMember2020-12-310000072741us-gaap:AdditionalPaidInCapitalMember2020-12-310000072741us-gaap:RetainedEarningsMember2020-12-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000072741us-gaap:TreasuryStockMember2020-12-3100000727412020-12-310000072741us-gaap:RetainedEarningsMember2021-01-012021-03-3100000727412021-01-012021-03-310000072741us-gaap:AdditionalPaidInCapitalMember2021-01-012021-03-310000072741us-gaap:CommonStockMember2021-01-012021-03-310000072741us-gaap:TreasuryStockMember2021-01-012021-03-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-03-310000072741us-gaap:CommonStockMember2021-03-310000072741us-gaap:AdditionalPaidInCapitalMember2021-03-310000072741us-gaap:RetainedEarningsMember2021-03-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000072741us-gaap:TreasuryStockMember2021-03-3100000727412021-03-310000072741us-gaap:RetainedEarningsMember2021-04-012021-06-3000000727412021-04-012021-06-300000072741us-gaap:AdditionalPaidInCapitalMember2021-04-012021-06-300000072741us-gaap:CommonStockMember2021-04-012021-06-300000072741us-gaap:TreasuryStockMember2021-04-012021-06-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000072741us-gaap:CommonStockMember2021-06-300000072741us-gaap:AdditionalPaidInCapitalMember2021-06-300000072741us-gaap:RetainedEarningsMember2021-06-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000072741us-gaap:TreasuryStockMember2021-06-3000000727412021-06-300000072741us-gaap:RetainedEarningsMember2021-07-012021-09-300000072741us-gaap:AdditionalPaidInCapitalMember2021-07-012021-09-300000072741us-gaap:CommonStockMember2021-07-012021-09-300000072741us-gaap:TreasuryStockMember2021-07-012021-09-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000072741us-gaap:CommonStockMember2021-09-300000072741us-gaap:AdditionalPaidInCapitalMember2021-09-300000072741us-gaap:RetainedEarningsMember2021-09-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-09-300000072741us-gaap:TreasuryStockMember2021-09-3000000727412021-09-300000072741es:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:CommonStockMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-03-310000072741es:TheConnecticutLightAndPowerCompanyMember2022-01-012022-03-310000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-03-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-03-310000072741us-gaap:CommonStockMemberes:TheConnecticutLightAndPowerCompanyMember2022-03-310000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2022-03-310000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2022-03-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-03-310000072741es:TheConnecticutLightAndPowerCompanyMember2022-03-310000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2022-04-012022-06-300000072741es:TheConnecticutLightAndPowerCompanyMember2022-04-012022-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2022-04-012022-06-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-04-012022-06-300000072741us-gaap:CommonStockMemberes:TheConnecticutLightAndPowerCompanyMember2022-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2022-06-300000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2022-06-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-06-300000072741es:TheConnecticutLightAndPowerCompanyMember2022-06-300000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:CommonStockMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741us-gaap:CommonStockMemberes:TheConnecticutLightAndPowerCompanyMember2020-12-310000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2020-12-310000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2020-12-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2020-12-310000072741es:TheConnecticutLightAndPowerCompanyMember2020-12-310000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-03-310000072741es:TheConnecticutLightAndPowerCompanyMember2021-01-012021-03-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-03-310000072741us-gaap:CommonStockMemberes:TheConnecticutLightAndPowerCompanyMember2021-03-310000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2021-03-310000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2021-03-310000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-03-310000072741es:TheConnecticutLightAndPowerCompanyMember2021-03-310000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2021-04-012021-06-300000072741es:TheConnecticutLightAndPowerCompanyMember2021-04-012021-06-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-04-012021-06-300000072741us-gaap:CommonStockMemberes:TheConnecticutLightAndPowerCompanyMember2021-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2021-06-300000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2021-06-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-06-300000072741es:TheConnecticutLightAndPowerCompanyMember2021-06-300000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:CommonStockMemberes:TheConnecticutLightAndPowerCompanyMember2021-09-300000072741us-gaap:AdditionalPaidInCapitalMemberes:TheConnecticutLightAndPowerCompanyMember2021-09-300000072741us-gaap:RetainedEarningsMemberes:TheConnecticutLightAndPowerCompanyMember2021-09-300000072741us-gaap:AccumulatedOtherComprehensiveIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-09-300000072741es:TheConnecticutLightAndPowerCompanyMember2021-09-300000072741es:NstarElectricCompanyMember2022-09-300000072741es:NstarElectricCompanyMember2021-12-310000072741es:NstarElectricCompanyMember2022-07-012022-09-300000072741es:NstarElectricCompanyMember2021-07-012021-09-300000072741es:NstarElectricCompanyMember2021-01-012021-09-300000072741us-gaap:CommonStockMemberes:NstarElectricCompanyMember2021-12-310000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2021-12-310000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2022-01-012022-03-310000072741es:NstarElectricCompanyMember2022-01-012022-03-310000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-03-310000072741us-gaap:CommonStockMemberes:NstarElectricCompanyMember2022-03-310000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2022-03-310000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2022-03-310000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-03-310000072741es:NstarElectricCompanyMember2022-03-310000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2022-04-012022-06-300000072741es:NstarElectricCompanyMember2022-04-012022-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2022-04-012022-06-300000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-04-012022-06-300000072741us-gaap:CommonStockMemberes:NstarElectricCompanyMember2022-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2022-06-300000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2022-06-300000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-300000072741es:NstarElectricCompanyMember2022-06-300000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2022-07-012022-09-300000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-07-012022-09-300000072741us-gaap:CommonStockMemberes:NstarElectricCompanyMember2022-09-300000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2022-09-300000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-09-300000072741us-gaap:CommonStockMemberes:NstarElectricCompanyMember2020-12-310000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2020-12-310000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2020-12-310000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000072741es:NstarElectricCompanyMember2020-12-310000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2021-01-012021-03-310000072741es:NstarElectricCompanyMember2021-01-012021-03-310000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-03-310000072741us-gaap:CommonStockMemberes:NstarElectricCompanyMember2021-03-310000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2021-03-310000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2021-03-310000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000072741es:NstarElectricCompanyMember2021-03-310000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2021-04-012021-06-300000072741es:NstarElectricCompanyMember2021-04-012021-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2021-04-012021-06-300000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000072741us-gaap:CommonStockMemberes:NstarElectricCompanyMember2021-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2021-06-300000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2021-06-300000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000072741es:NstarElectricCompanyMember2021-06-300000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2021-07-012021-09-300000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000072741us-gaap:CommonStockMemberes:NstarElectricCompanyMember2021-09-300000072741us-gaap:AdditionalPaidInCapitalMemberes:NstarElectricCompanyMember2021-09-300000072741es:NstarElectricCompanyMemberus-gaap:RetainedEarningsMember2021-09-300000072741es:NstarElectricCompanyMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-09-300000072741es:NstarElectricCompanyMember2021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2021-01-012021-09-300000072741us-gaap:CommonStockMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2022-01-012022-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2022-01-012022-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-03-310000072741us-gaap:CommonStockMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-03-310000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2022-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2022-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2022-04-012022-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2022-04-012022-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-04-012022-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-04-012022-06-300000072741us-gaap:CommonStockMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2022-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2022-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-07-012022-09-300000072741us-gaap:CommonStockMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2022-09-300000072741us-gaap:CommonStockMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2020-12-310000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2020-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2020-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2020-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2021-01-012021-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2021-01-012021-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-03-310000072741us-gaap:CommonStockMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-03-310000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2021-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2021-03-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2021-04-012021-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2021-04-012021-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-04-012021-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000072741us-gaap:CommonStockMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-06-300000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2021-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2021-06-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000072741us-gaap:CommonStockMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-09-300000072741us-gaap:AdditionalPaidInCapitalMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:RetainedEarningsMember2021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMember2021-09-30es:customer0000072741es:ConnecticutMassachusettsandNewHampshireMember2022-01-012022-09-30es:regulatedUtility0000072741es:COVID19Member2022-09-300000072741es:COVID19Member2021-12-310000072741es:COVID19Memberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:COVID19Memberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:COVID19Member2022-09-300000072741es:NstarElectricCompanyMemberes:COVID19Member2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:COVID19Member2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:COVID19Member2021-12-310000072741es:YankeeGasServicesCompanyMember2022-01-012022-09-300000072741es:HardshipAccountsMember2022-06-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2022-06-300000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2022-06-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2022-06-300000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2022-06-300000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2022-06-300000072741es:HardshipAccountsMember2022-07-012022-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2022-07-012022-09-300000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2022-07-012022-09-300000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2022-07-012022-09-300000072741es:HardshipAccountsMember2022-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2022-09-300000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2022-09-300000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2022-09-300000072741es:HardshipAccountsMember2021-12-310000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2021-12-310000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2021-12-310000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2021-12-310000072741es:HardshipAccountsMember2022-01-012022-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2022-01-012022-09-300000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2022-01-012022-09-300000072741es:HardshipAccountsMember2021-06-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2021-06-300000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2021-06-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2021-06-300000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2021-06-300000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2021-06-300000072741es:HardshipAccountsMember2021-07-012021-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2021-07-012021-09-300000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2021-07-012021-09-300000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2021-07-012021-09-300000072741es:HardshipAccountsMember2021-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2021-09-300000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2021-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2021-09-300000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2021-09-300000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2021-09-300000072741es:HardshipAccountsMember2020-12-310000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2020-12-310000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2020-12-310000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2020-12-310000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2020-12-310000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2020-12-310000072741es:HardshipAccountsMember2021-01-012021-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMember2021-01-012021-09-300000072741es:HardshipAccountsMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:RetailNonHardshipWholesaleandOtherReceivablesMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:NstarElectricCompanyMemberes:HardshipAccountsMember2021-01-012021-09-300000072741es:NstarElectricCompanyMemberes:RetailNonHardshipWholesaleandOtherReceivablesMember2021-01-012021-09-300000072741es:NonServiceCostBenefitsMember2022-07-012022-09-300000072741es:NonServiceCostBenefitsMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:NstarElectricCompanyMemberes:NonServiceCostBenefitsMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:NonServiceCostBenefitsMember2022-07-012022-09-300000072741es:NonServiceCostBenefitsMember2021-07-012021-09-300000072741es:NonServiceCostBenefitsMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:NstarElectricCompanyMemberes:NonServiceCostBenefitsMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:NonServiceCostBenefitsMember2021-07-012021-09-300000072741es:AFUDCEquityMember2022-07-012022-09-300000072741es:AFUDCEquityMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:AFUDCEquityMemberes:NstarElectricCompanyMember2022-07-012022-09-300000072741es:AFUDCEquityMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-07-012022-09-300000072741es:AFUDCEquityMember2021-07-012021-09-300000072741es:AFUDCEquityMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:AFUDCEquityMemberes:NstarElectricCompanyMember2021-07-012021-09-300000072741es:AFUDCEquityMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-07-012021-09-300000072741es:EquityinEarningsLossOfUnconsolidatedAffiliateMember2022-07-012022-09-300000072741es:EquityinEarningsLossOfUnconsolidatedAffiliateMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:NstarElectricCompanyMemberes:EquityinEarningsLossOfUnconsolidatedAffiliateMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:EquityinEarningsLossOfUnconsolidatedAffiliateMember2022-07-012022-09-300000072741es:EquityinEarningsLossOfUnconsolidatedAffiliateMember2021-07-012021-09-300000072741es:EquityinEarningsLossOfUnconsolidatedAffiliateMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:NstarElectricCompanyMemberes:EquityinEarningsLossOfUnconsolidatedAffiliateMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:EquityinEarningsLossOfUnconsolidatedAffiliateMember2021-07-012021-09-300000072741es:InvestmentIncomeLossMember2022-07-012022-09-300000072741es:InvestmentIncomeLossMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:InvestmentIncomeLossMemberes:NstarElectricCompanyMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:InvestmentIncomeLossMember2022-07-012022-09-300000072741es:InvestmentIncomeLossMember2021-07-012021-09-300000072741es:InvestmentIncomeLossMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:InvestmentIncomeLossMemberes:NstarElectricCompanyMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:InvestmentIncomeLossMember2021-07-012021-09-300000072741us-gaap:InterestIncomeMember2022-07-012022-09-300000072741us-gaap:InterestIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:InterestIncomeMemberes:NstarElectricCompanyMember2022-07-012022-09-300000072741us-gaap:InterestIncomeMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-07-012022-09-300000072741us-gaap:InterestIncomeMember2021-07-012021-09-300000072741us-gaap:InterestIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:InterestIncomeMemberes:NstarElectricCompanyMember2021-07-012021-09-300000072741us-gaap:InterestIncomeMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-07-012021-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMember2022-07-012022-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMemberes:NstarElectricCompanyMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:GainLossOnDispositionOfPropertyPlantAndEquipmentMember2022-07-012022-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMember2021-07-012021-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMemberes:NstarElectricCompanyMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:GainLossOnDispositionOfPropertyPlantAndEquipmentMember2021-07-012021-09-300000072741es:OtherMember2022-07-012022-09-300000072741es:OtherMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:NstarElectricCompanyMemberes:OtherMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherMember2022-07-012022-09-300000072741es:OtherMember2021-07-012021-09-300000072741es:OtherMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:NstarElectricCompanyMemberes:OtherMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherMember2021-07-012021-09-300000072741es:NonServiceCostBenefitsMember2022-01-012022-09-300000072741es:NonServiceCostBenefitsMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberes:NonServiceCostBenefitsMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:NonServiceCostBenefitsMember2022-01-012022-09-300000072741es:NonServiceCostBenefitsMember2021-01-012021-09-300000072741es:NonServiceCostBenefitsMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:NstarElectricCompanyMemberes:NonServiceCostBenefitsMember2021-01-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:NonServiceCostBenefitsMember2021-01-012021-09-300000072741es:AFUDCEquityMember2022-01-012022-09-300000072741es:AFUDCEquityMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:AFUDCEquityMemberes:NstarElectricCompanyMember2022-01-012022-09-300000072741es:AFUDCEquityMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-01-012022-09-300000072741es:AFUDCEquityMember2021-01-012021-09-300000072741es:AFUDCEquityMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:AFUDCEquityMemberes:NstarElectricCompanyMember2021-01-012021-09-300000072741es:AFUDCEquityMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-01-012021-09-300000072741es:EquityinEarningsLossOfUnconsolidatedAffiliateMember2022-01-012022-09-300000072741es:EquityinEarningsLossOfUnconsolidatedAffiliateMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberes:EquityinEarningsLossOfUnconsolidatedAffiliateMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:EquityinEarningsLossOfUnconsolidatedAffiliateMember2022-01-012022-09-300000072741es:EquityinEarningsLossOfUnconsolidatedAffiliateMember2021-01-012021-09-300000072741es:EquityinEarningsLossOfUnconsolidatedAffiliateMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:NstarElectricCompanyMemberes:EquityinEarningsLossOfUnconsolidatedAffiliateMember2021-01-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:EquityinEarningsLossOfUnconsolidatedAffiliateMember2021-01-012021-09-300000072741es:InvestmentIncomeLossMember2022-01-012022-09-300000072741es:InvestmentIncomeLossMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:InvestmentIncomeLossMemberes:NstarElectricCompanyMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:InvestmentIncomeLossMember2022-01-012022-09-300000072741es:InvestmentIncomeLossMember2021-01-012021-09-300000072741es:InvestmentIncomeLossMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:InvestmentIncomeLossMemberes:NstarElectricCompanyMember2021-01-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:InvestmentIncomeLossMember2021-01-012021-09-300000072741us-gaap:InterestIncomeMember2022-01-012022-09-300000072741us-gaap:InterestIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:InterestIncomeMemberes:NstarElectricCompanyMember2022-01-012022-09-300000072741us-gaap:InterestIncomeMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-01-012022-09-300000072741us-gaap:InterestIncomeMember2021-01-012021-09-300000072741us-gaap:InterestIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:InterestIncomeMemberes:NstarElectricCompanyMember2021-01-012021-09-300000072741us-gaap:InterestIncomeMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-01-012021-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMember2022-01-012022-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMemberes:NstarElectricCompanyMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:GainLossOnDispositionOfPropertyPlantAndEquipmentMember2022-01-012022-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMember2021-01-012021-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:GainLossOnDispositionOfPropertyPlantAndEquipmentMemberes:NstarElectricCompanyMember2021-01-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:GainLossOnDispositionOfPropertyPlantAndEquipmentMember2021-01-012021-09-300000072741es:OtherMember2022-01-012022-09-300000072741es:OtherMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberes:OtherMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherMember2022-01-012022-09-300000072741es:OtherMember2021-01-012021-09-300000072741es:OtherMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:NstarElectricCompanyMemberes:OtherMember2021-01-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherMember2021-01-012021-09-300000072741es:EquityInEarningsMember2022-01-012022-09-300000072741es:EquityInEarningsMember2021-01-012021-09-300000072741es:OffshoreWindBusinessNorthEastOffshoreAndBayStateWindMember2022-09-30xbrli:pure0000072741es:OffshoreWindBusinessNorthEastOffshoreAndBayStateWindMember2021-12-310000072741es:NaturalGasInfrastructurePipelineOwnedByEnbridgeInc.Member2022-09-300000072741es:NaturalGasInfrastructurePipelineOwnedByEnbridgeInc.Member2021-12-310000072741es:RenewableEnergyInvestmentFundMember2022-09-300000072741es:RenewableEnergyInvestmentFundMember2021-12-310000072741es:OtherEquityMethodInvestmentsMember2022-09-300000072741es:OtherEquityMethodInvestmentsMember2021-12-310000072741es:NortheastOffshoreLLCMember2022-09-30es:project0000072741es:OffshoreWindBusinessMember2022-05-040000072741us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2022-09-300000072741us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2022-09-300000072741us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2021-12-310000072741us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2021-12-310000072741es:MarketableSecuritiesMember2022-09-300000072741es:MarketableSecuritiesMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:MarketableSecuritiesMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:MarketableSecuritiesMember2022-09-300000072741es:MarketableSecuritiesMember2021-12-310000072741es:MarketableSecuritiesMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:MarketableSecuritiesMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:MarketableSecuritiesMember2021-12-310000072741us-gaap:OtherNoncurrentAssetsMember2022-09-300000072741us-gaap:OtherNoncurrentAssetsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberus-gaap:OtherNoncurrentAssetsMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:OtherNoncurrentAssetsMember2022-09-300000072741us-gaap:OtherNoncurrentAssetsMember2021-12-310000072741us-gaap:OtherNoncurrentAssetsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberus-gaap:OtherNoncurrentAssetsMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:OtherNoncurrentAssetsMember2021-12-310000072741es:CustomerAssistanceFundMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:CustomerAssistanceFundMemberes:TheConnecticutLightAndPowerCompanyMember2022-03-310000072741es:EnergyReliefFundMerrimackValleyProgramsMember2022-09-300000072741es:EnergyReliefFundMerrimackValleyProgramsMember2021-12-310000072741es:BenefitCostsMember2022-09-300000072741es:BenefitCostsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:BenefitCostsMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:BenefitCostsMember2022-09-300000072741es:BenefitCostsMember2021-12-310000072741es:BenefitCostsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:BenefitCostsMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:BenefitCostsMember2021-12-310000072741es:StormRestorationCostsMember2022-09-300000072741es:StormRestorationCostsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:StormRestorationCostsMemberes:NstarElectricCompanyMember2022-09-300000072741es:StormRestorationCostsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741es:StormRestorationCostsMember2021-12-310000072741es:StormRestorationCostsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:StormRestorationCostsMemberes:NstarElectricCompanyMember2021-12-310000072741es:StormRestorationCostsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741es:RegulatoryTrackerDeferralsRegulatoryAssetsMember2022-09-300000072741es:RegulatoryTrackerDeferralsRegulatoryAssetsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:RegulatoryTrackerDeferralsRegulatoryAssetsMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:RegulatoryTrackerDeferralsRegulatoryAssetsMember2022-09-300000072741es:RegulatoryTrackerDeferralsRegulatoryAssetsMember2021-12-310000072741es:RegulatoryTrackerDeferralsRegulatoryAssetsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:RegulatoryTrackerDeferralsRegulatoryAssetsMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:RegulatoryTrackerDeferralsRegulatoryAssetsMember2021-12-310000072741us-gaap:DeferredIncomeTaxChargesMember2022-09-300000072741us-gaap:DeferredIncomeTaxChargesMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741us-gaap:DeferredIncomeTaxChargesMemberes:NstarElectricCompanyMember2022-09-300000072741us-gaap:DeferredIncomeTaxChargesMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741us-gaap:DeferredIncomeTaxChargesMember2021-12-310000072741us-gaap:DeferredIncomeTaxChargesMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741us-gaap:DeferredIncomeTaxChargesMemberes:NstarElectricCompanyMember2021-12-310000072741us-gaap:DeferredIncomeTaxChargesMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741us-gaap:StrandedCostsMember2022-09-300000072741us-gaap:StrandedCostsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741us-gaap:StrandedCostsMemberes:NstarElectricCompanyMember2022-09-300000072741us-gaap:StrandedCostsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741us-gaap:StrandedCostsMember2021-12-310000072741us-gaap:StrandedCostsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741us-gaap:StrandedCostsMemberes:NstarElectricCompanyMember2021-12-310000072741us-gaap:StrandedCostsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741es:GoodwillRegulatoryAssetMember2022-09-300000072741es:GoodwillRegulatoryAssetMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:GoodwillRegulatoryAssetMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:GoodwillRegulatoryAssetMember2022-09-300000072741es:GoodwillRegulatoryAssetMember2021-12-310000072741es:GoodwillRegulatoryAssetMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:GoodwillRegulatoryAssetMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:GoodwillRegulatoryAssetMember2021-12-310000072741es:RegulatoryAssetsOffsettingDerivativeLiabilitiesMember2022-09-300000072741es:RegulatoryAssetsOffsettingDerivativeLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:RegulatoryAssetsOffsettingDerivativeLiabilitiesMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:RegulatoryAssetsOffsettingDerivativeLiabilitiesMember2022-09-300000072741es:RegulatoryAssetsOffsettingDerivativeLiabilitiesMember2021-12-310000072741es:RegulatoryAssetsOffsettingDerivativeLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:RegulatoryAssetsOffsettingDerivativeLiabilitiesMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:RegulatoryAssetsOffsettingDerivativeLiabilitiesMember2021-12-310000072741es:AssetRetirementObligationsMember2022-09-300000072741es:AssetRetirementObligationsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:AssetRetirementObligationsMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:AssetRetirementObligationsMember2022-09-300000072741es:AssetRetirementObligationsMember2021-12-310000072741es:AssetRetirementObligationsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:AssetRetirementObligationsMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:AssetRetirementObligationsMember2021-12-310000072741es:OtherRegulatoryAssetsMember2022-09-300000072741es:OtherRegulatoryAssetsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:OtherRegulatoryAssetsMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherRegulatoryAssetsMember2022-09-300000072741es:OtherRegulatoryAssetsMember2021-12-310000072741es:OtherRegulatoryAssetsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:OtherRegulatoryAssetsMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherRegulatoryAssetsMember2021-12-310000072741es:ExcessADITduetotaxCutsandJobsActMember2022-09-300000072741es:ExcessADITduetotaxCutsandJobsActMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:ExcessADITduetotaxCutsandJobsActMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:ExcessADITduetotaxCutsandJobsActMember2022-09-300000072741es:ExcessADITduetotaxCutsandJobsActMember2021-12-310000072741es:ExcessADITduetotaxCutsandJobsActMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:ExcessADITduetotaxCutsandJobsActMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:ExcessADITduetotaxCutsandJobsActMember2021-12-310000072741es:CostOfRemovalMember2022-09-300000072741es:CostOfRemovalMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:CostOfRemovalMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:CostOfRemovalMember2022-09-300000072741es:CostOfRemovalMember2021-12-310000072741es:CostOfRemovalMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:CostOfRemovalMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:CostOfRemovalMember2021-12-310000072741es:RegulatoryTrackerDeferralsRegulatoryLiabilitiesMember2022-09-300000072741es:RegulatoryTrackerDeferralsRegulatoryLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:RegulatoryTrackerDeferralsRegulatoryLiabilitiesMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:RegulatoryTrackerDeferralsRegulatoryLiabilitiesMember2022-09-300000072741es:RegulatoryTrackerDeferralsRegulatoryLiabilitiesMember2021-12-310000072741es:RegulatoryTrackerDeferralsRegulatoryLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:RegulatoryTrackerDeferralsRegulatoryLiabilitiesMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:RegulatoryTrackerDeferralsRegulatoryLiabilitiesMember2021-12-310000072741es:DeferredPortionOfNonServiceIncomeMember2022-09-300000072741es:DeferredPortionOfNonServiceIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:DeferredPortionOfNonServiceIncomeMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:DeferredPortionOfNonServiceIncomeMember2022-09-300000072741es:DeferredPortionOfNonServiceIncomeMember2021-12-310000072741es:DeferredPortionOfNonServiceIncomeMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:DeferredPortionOfNonServiceIncomeMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:DeferredPortionOfNonServiceIncomeMember2021-12-310000072741es:BenefitCostsMember2022-09-300000072741es:BenefitCostsMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:BenefitCostsMemberes:NstarElectricCompanyMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:BenefitCostsMember2022-09-300000072741es:BenefitCostsMember2021-12-310000072741es:BenefitCostsMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:BenefitCostsMemberes:NstarElectricCompanyMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:BenefitCostsMember2021-12-310000072741es:AfudcTransmissionIncentiveMember2022-09-300000072741es:AfudcTransmissionIncentiveMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:AfudcTransmissionIncentiveMemberes:NstarElectricCompanyMember2022-09-300000072741es:AfudcTransmissionIncentiveMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741es:AfudcTransmissionIncentiveMember2021-12-310000072741es:AfudcTransmissionIncentiveMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:AfudcTransmissionIncentiveMemberes:NstarElectricCompanyMember2021-12-310000072741es:AfudcTransmissionIncentiveMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741es:TheConnecticutLightAndPowerCompanySettlementAgreementMember2022-09-300000072741es:TheConnecticutLightAndPowerCompanySettlementAgreementMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:TheConnecticutLightAndPowerCompanySettlementAgreementMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:TheConnecticutLightAndPowerCompanySettlementAgreementMember2022-09-300000072741es:TheConnecticutLightAndPowerCompanySettlementAgreementMember2021-12-310000072741es:TheConnecticutLightAndPowerCompanySettlementAgreementMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberes:TheConnecticutLightAndPowerCompanySettlementAgreementMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:TheConnecticutLightAndPowerCompanySettlementAgreementMember2021-12-310000072741es:OtherRegulatoryLiabilitiesMember2022-09-300000072741es:OtherRegulatoryLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:OtherRegulatoryLiabilitiesMemberes:NstarElectricCompanyMember2022-09-300000072741es:OtherRegulatoryLiabilitiesMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741es:OtherRegulatoryLiabilitiesMember2021-12-310000072741es:OtherRegulatoryLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:OtherRegulatoryLiabilitiesMemberes:NstarElectricCompanyMember2021-12-310000072741es:OtherRegulatoryLiabilitiesMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-09-300000072741us-gaap:PrepaidExpensesAndOtherCurrentAssetsMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-12-310000072741us-gaap:OtherNoncurrentAssetsMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-09-300000072741us-gaap:OtherNoncurrentAssetsMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-12-310000072741us-gaap:OtherCurrentLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-09-300000072741us-gaap:OtherCurrentLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-12-310000072741us-gaap:OtherNoncurrentLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-09-300000072741us-gaap:OtherNoncurrentLiabilitiesMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-12-31utr:MW0000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-09-300000072741srt:MinimumMemberes:MeasurementInputForwardReserveMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-09-30iso4217:USDes:KWmo0000072741srt:MaximumMemberes:MeasurementInputForwardReserveMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-09-300000072741es:MeasurementInputForwardReserveMembersrt:WeightedAverageMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-09-300000072741srt:MinimumMemberes:MeasurementInputForwardReserveMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-12-310000072741srt:MaximumMemberes:MeasurementInputForwardReserveMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-12-310000072741es:MeasurementInputForwardReserveMembersrt:WeightedAverageMemberes:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-12-310000072741srt:MinimumMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-09-300000072741srt:MaximumMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-09-300000072741srt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-09-300000072741srt:WeightedAverageMemberes:MeasurementInputCapacityPricesMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-06-300000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-06-300000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-12-310000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2020-12-310000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-07-012022-09-300000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-07-012021-09-300000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-09-300000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-09-300000072741es:TheConnecticutLightAndPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2021-09-300000072741es:CyapcAndYaecMember2022-09-300000072741es:CyapcAndYaecMember2021-12-310000072741us-gaap:FairValueInputsLevel1Memberes:MutualFundsMember2022-09-300000072741us-gaap:FairValueInputsLevel1Memberes:MutualFundsMember2021-12-310000072741us-gaap:FairValueInputsLevel1Memberus-gaap:CashAndCashEquivalentsMember2022-09-300000072741us-gaap:FairValueInputsLevel1Memberus-gaap:CashAndCashEquivalentsMember2021-12-310000072741us-gaap:FairValueInputsLevel1Member2022-09-300000072741us-gaap:FairValueInputsLevel1Member2021-12-310000072741us-gaap:USGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-09-300000072741us-gaap:USGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000072741us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-09-300000072741us-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000072741us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-09-300000072741us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000072741us-gaap:MunicipalBondsMemberus-gaap:FairValueInputsLevel2Member2022-09-300000072741us-gaap:MunicipalBondsMemberus-gaap:FairValueInputsLevel2Member2021-12-310000072741us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-09-300000072741us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000072741us-gaap:FairValueInputsLevel2Member2022-09-300000072741us-gaap:FairValueInputsLevel2Member2021-12-310000072741srt:ParentCompanyMemberus-gaap:CommercialPaperMember2022-09-300000072741us-gaap:LineOfCreditMembersrt:ParentCompanyMember2022-01-012022-09-300000072741us-gaap:LineOfCreditMembersrt:ParentCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberus-gaap:CommercialPaperMember2022-09-300000072741es:NstarElectricCompanyMemberes:NstarElectricCompanyMemberus-gaap:LineOfCreditMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberus-gaap:LineOfCreditMember2022-09-300000072741us-gaap:CommercialPaperMember2022-09-300000072741us-gaap:CommercialPaperMember2021-12-310000072741es:NstarElectricCompanyMemberus-gaap:CommercialPaperMember2021-12-310000072741us-gaap:LineOfCreditMember2022-09-300000072741us-gaap:LineOfCreditMember2021-12-310000072741us-gaap:LineOfCreditMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:LineOfCreditMember2022-09-300000072741es:NSTARGasMemberus-gaap:LineOfCreditMember2022-06-140000072741es:DebenturesMemberes:NstarElectricCompanyMemberes:NSTARElectric455DebenturesMember2022-05-310000072741es:DebenturesMemberes:NstarElectricCompanyMemberes:NSTARElectric455DebenturesMember2022-05-012022-05-310000072741es:DebenturesMemberes:NstarElectricCompanyMemberes:NSTARElectric495DebenturesMember2022-09-300000072741es:DebenturesMemberes:NstarElectricCompanyMemberes:NSTARElectric495DebenturesMember2022-09-012022-09-300000072741us-gaap:SubsequentEventMemberes:DebenturesMemberes:NstarElectricCompanyMemberes:NSTARElectric2375DebenturesMember2022-10-310000072741us-gaap:SubsequentEventMemberes:DebenturesMemberes:NstarElectricCompanyMemberes:NSTARElectric2375DebenturesMember2022-10-012022-10-310000072741us-gaap:SeniorNotesMembersrt:ParentCompanyMemberes:EversourceParent290SeriesISeniorNotesMember2022-02-280000072741us-gaap:SeniorNotesMembersrt:ParentCompanyMemberes:EversourceParent290SeriesISeniorNotesMember2022-02-012022-02-280000072741es:EversourceParent3375SeriesWSeniorNotesMemberus-gaap:SeniorNotesMembersrt:ParentCompanyMember2022-02-280000072741es:EversourceParent3375SeriesWSeniorNotesMemberus-gaap:SeniorNotesMembersrt:ParentCompanyMember2022-02-012022-02-280000072741es:EversourceParent420SeriesXSeniorNotesMemberus-gaap:SeniorNotesMembersrt:ParentCompanyMember2022-06-300000072741es:EversourceParent420SeriesXSeniorNotesMemberus-gaap:SeniorNotesMembersrt:ParentCompanyMember2022-06-012022-06-300000072741us-gaap:SeniorNotesMemberes:EversourceParent460SeriesYSeniorNotesMembersrt:ParentCompanyMember2022-06-300000072741us-gaap:SeniorNotesMemberes:EversourceParent460SeriesYSeniorNotesMembersrt:ParentCompanyMember2022-06-012022-06-300000072741es:EversourceParent275SeriesKSeniorNotesMemberus-gaap:SeniorNotesMembersrt:ParentCompanyMember2022-03-310000072741es:EversourceParent275SeriesKSeniorNotesMemberus-gaap:SeniorNotesMembersrt:ParentCompanyMember2022-03-012022-03-310000072741es:YankeeGasServicesCompanyMemberes:YankeeGas848SeriesBFirstMortgageBondsMemberus-gaap:FirstMortgageMember2022-03-310000072741es:YankeeGasServicesCompanyMemberes:YankeeGas848SeriesBFirstMortgageBondsMemberus-gaap:FirstMortgageMember2022-03-012022-03-310000072741es:YankeeGas431SeriesUFirstMortgageBondsMemberes:YankeeGasServicesCompanyMemberus-gaap:FirstMortgageMember2022-09-300000072741es:YankeeGas431SeriesUFirstMortgageBondsMemberes:YankeeGasServicesCompanyMemberus-gaap:FirstMortgageMember2022-09-012022-09-300000072741es:EGMAMemberes:EGMA470SeriesCFirstMortgageBondsMemberus-gaap:FirstMortgageMember2022-06-300000072741es:EGMAMemberes:EGMA470SeriesCFirstMortgageBondsMemberus-gaap:FirstMortgageMember2022-06-012022-06-300000072741es:NSTARGas440SeriesVFirstMortgageBondsMemberes:NSTARGasMemberus-gaap:FirstMortgageMember2022-07-310000072741es:NSTARGas440SeriesVFirstMortgageBondsMemberes:NSTARGasMemberus-gaap:FirstMortgageMember2022-07-012022-07-310000072741es:AquarionWaterCompany445GMBMemberes:AquarionWaterCompanyMemberes:GeneralMortgageBondsGMBMember2022-07-310000072741es:AquarionWaterCompany445GMBMemberes:AquarionWaterCompanyMemberes:GeneralMortgageBondsGMBMember2022-07-012022-07-310000072741es:AquarionWaterCompany469MortgageBondsMemberes:AquarionWaterCompanyMemberus-gaap:SeniorNotesMember2022-08-310000072741es:AquarionWaterCompany469MortgageBondsMemberes:AquarionWaterCompanyMemberus-gaap:SeniorNotesMember2022-08-012022-08-310000072741es:NstarElectricCompanyMember2022-09-152022-09-150000072741us-gaap:SubsequentEventMemberes:NstarElectricCompanyMember2022-10-152022-10-150000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:RateReductionBondsMember2018-05-310000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2022-09-300000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2021-12-310000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:OtherNoncurrentAssetsMember2022-09-300000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:OtherNoncurrentAssetsMember2021-12-310000072741us-gaap:StrandedCostsMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741us-gaap:StrandedCostsMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherRegulatoryAssetsMember2022-09-300000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherRegulatoryAssetsMember2021-12-310000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-09-300000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-12-310000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:RateReductionBondsMember2022-07-012022-09-300000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:RateReductionBondsMember2021-07-012021-09-300000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:RateReductionBondsMember2022-01-012022-09-300000072741us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:RateReductionBondsMember2021-01-012021-09-300000072741us-gaap:PensionPlansDefinedBenefitMember2022-07-012022-09-300000072741us-gaap:PensionPlansDefinedBenefitMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:NstarElectricCompanyMemberus-gaap:PensionPlansDefinedBenefitMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:PensionPlansDefinedBenefitMember2022-07-012022-09-300000072741us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-07-012022-09-300000072741us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741es:NstarElectricCompanyMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-07-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-07-012022-09-300000072741us-gaap:PensionPlansDefinedBenefitMember2022-01-012022-09-300000072741us-gaap:PensionPlansDefinedBenefitMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-09-300000072741us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-09-300000072741us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-09-300000072741us-gaap:PensionPlansDefinedBenefitMember2021-07-012021-09-300000072741us-gaap:PensionPlansDefinedBenefitMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:NstarElectricCompanyMemberus-gaap:PensionPlansDefinedBenefitMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:PensionPlansDefinedBenefitMember2021-07-012021-09-300000072741us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-07-012021-09-300000072741us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741es:NstarElectricCompanyMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-07-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-07-012021-09-300000072741us-gaap:PensionPlansDefinedBenefitMember2021-01-012021-09-300000072741us-gaap:PensionPlansDefinedBenefitMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:NstarElectricCompanyMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-09-300000072741us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-09-300000072741us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741es:NstarElectricCompanyMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-09-30es:site0000072741es:MgpSiteAccrualMember2022-09-300000072741es:MgpSiteAccrualMember2021-12-310000072741es:NstarElectricCompanyMemberes:RenewableEnergyMember2022-09-300000072741es:OffshoreWindProjectMember2022-01-012022-09-300000072741es:NstarElectricCompanyMembersrt:MinimumMemberes:RenewableEnergyMemberes:MassachusettsCleanEnergy83DContractMember2022-01-012022-09-300000072741es:NstarElectricCompanyMembersrt:MaximumMemberes:RenewableEnergyMemberes:MassachusettsCleanEnergy83DContractMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberes:RenewableEnergyMemberes:MassachusettsCleanEnergy83DContractMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberes:RenewableEnergyMemberes:MassachusettsCleanEnergy83DContractMember2022-09-300000072741es:NortheastOffshoreLLCMemberes:PurchaseGuaranteeMember2022-09-300000072741es:PurchaseGuaranteeMemberes:SunriseWindLLCMember2022-09-300000072741es:PurchaseGuaranteeMemberes:RevolutionWindLLCMember2022-09-300000072741es:PurchaseGuaranteeMemberes:SouthForkWindLLCMember2022-09-300000072741es:EversourceInvestmentLLCMemberus-gaap:IndemnificationGuaranteeMember2022-09-300000072741es:SouthForkWindLLCMemberes:PowerPurchaseAgreementMember2022-09-300000072741es:CapacityProductionGuaranteeMemberes:SunriseWindLLCMember2022-09-300000072741es:RealEstatePurchaseGuaranteeMemberes:BayStateWindLLCMember2022-09-300000072741es:SouthForkWindLLCMemberes:TransmissionInterconnectionGuaranteeMember2022-09-300000072741es:EversourceInvestmentLLCMemberus-gaap:LetterOfCreditMember2022-09-300000072741es:VariousEntitiesMemberus-gaap:SuretyBondMember2022-09-300000072741us-gaap:PropertyLeaseGuaranteeMemberes:RockyRiverRealtyCompanyAndEversourceServiceMember2022-09-300000072741es:NortheastOffshoreLLCMemberus-gaap:PerformanceGuaranteeMember2022-09-300000072741es:NortheastOffshoreLLCMemberus-gaap:PaymentGuaranteeMember2022-09-300000072741es:SunriseWindLLCMember2022-09-300000072741es:RevolutionWindLLCMember2022-09-300000072741es:PurchaseGuaranteeMemberes:SouthForkWindLLCMember2022-09-300000072741es:SouthForkWindLLCMember2022-09-300000072741es:EversourceInvestmentLLCMemberes:NortheastOffshoreLLCMember2022-09-300000072741es:EversourceInvestmentLLCMemberes:NortheastOffshoreLLCMemberus-gaap:IndemnificationGuaranteeMember2022-09-300000072741es:SouthForkWindLLCMemberes:PowerPurchaseAgreementMemberes:SouthForkWindLLCMember2022-09-300000072741es:CapacityProductionGuaranteeMemberes:SunriseWindLLCMemberes:SunriseWindLLCMember2022-09-300000072741es:CapacityProductionGuaranteeMemberes:SunriseWindLLCMemberes:SunriseWindLLCMember2019-10-250000072741us-gaap:LetterOfCreditMemberes:EversourceInvestmentLLCMember2020-09-1600000727412022-01-31es:letterOfCredit0000072741es:SouthForkWindLLCMemberus-gaap:LetterOfCreditMember2022-01-310000072741es:CYAPCYAECAndMYAPCMemberes:YankeeCompaniesMember2021-03-252021-03-250000072741es:FERCROEComplaintsMember2016-04-29es:complaint0000072741es:FERCROEFirstSecondandThirdComplaintsMember2014-07-310000072741es:FERCROEFirstSecondandThirdComplaintsMember2022-01-012022-09-300000072741es:FERCROEComplaintsMember2022-01-012022-09-300000072741es:FERCROEFourthComplaintMember2016-04-292016-04-290000072741srt:MinimumMemberes:FERCROEFirstSecondandThirdComplaintsMember2011-10-012014-10-150000072741srt:MaximumMemberes:FERCROEFirstSecondandThirdComplaintsMember2011-10-012014-10-150000072741es:FERCROEFirstComplaintMember2014-10-162014-10-160000072741es:FERCROEFirstComplaintMember2022-01-012022-09-300000072741es:FERCROEFirstComplaintMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741es:NstarElectricCompanyMemberes:FERCROEFirstComplaintMember2022-01-012022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:FERCROEFirstComplaintMember2022-01-012022-09-300000072741es:FERCROESecondComplaintMember2022-09-300000072741es:FERCROESecondComplaintMember2021-12-310000072741es:FERCROESecondComplaintMember2022-01-012022-09-300000072741es:FERCROESecondComplaintMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:FERCROESecondComplaintMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberes:FERCROESecondComplaintMember2021-12-310000072741es:NstarElectricCompanyMemberes:FERCROESecondComplaintMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:FERCROESecondComplaintMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberes:FERCROESecondComplaintMember2021-12-310000072741es:FERCROEComplaintsMember2018-10-160000072741es:FERCROEComplaintsMember2019-11-210000072741es:FERCROEComplaintsMember2019-12-230000072741es:FERCROEComplaintsMember2022-09-30es:period00000727412016-01-012016-12-31utr:kV00000727412021-04-280000072741us-gaap:UnfavorableRegulatoryActionMember2021-05-060000072741us-gaap:UnfavorableRegulatoryActionMember2021-07-140000072741us-gaap:UnfavorableRegulatoryActionMember2021-05-070000072741us-gaap:UnfavorableRegulatoryActionMemberes:TheConnecticutLightAndPowerCompanyMember2021-10-010000072741us-gaap:UnfavorableRegulatoryActionMemberes:TheConnecticutLightAndPowerCompanyMember2021-09-300000072741us-gaap:SalesMemberus-gaap:UnfavorableRegulatoryActionMember2021-01-012021-09-300000072741us-gaap:OilAndGasOperationAndMaintenanceMemberus-gaap:UnfavorableRegulatoryActionMember2021-01-012021-09-300000072741us-gaap:UnfavorableRegulatoryActionMember2021-10-012021-10-0100000727412021-10-012021-10-010000072741us-gaap:UnfavorableRegulatoryActionMember2021-01-012021-09-300000072741us-gaap:UnfavorableRegulatoryActionMember2021-09-300000072741us-gaap:CarryingReportedAmountFairValueDisclosureMember2022-09-300000072741us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2022-09-300000072741us-gaap:CarryingReportedAmountFairValueDisclosureMemberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Memberes:TheConnecticutLightAndPowerCompanyMember2022-09-300000072741es:NstarElectricCompanyMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-09-300000072741es:NstarElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-09-300000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2022-09-300000072741us-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000072741us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2021-12-310000072741us-gaap:CarryingReportedAmountFairValueDisclosureMemberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Memberes:TheConnecticutLightAndPowerCompanyMember2021-12-310000072741es:NstarElectricCompanyMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000072741es:NstarElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000072741es:PublicServiceCompanyOfNewHampshirePSNHMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2021-12-310000072741us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-12-310000072741us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-12-310000072741us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-12-310000072741us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-12-310000072741us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-12-310000072741us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000072741us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-01-012022-09-300000072741us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-01-012022-09-300000072741us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-01-012022-09-300000072741us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-01-012021-09-300000072741us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-01-012021-09-300000072741us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-09-300000072741us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-09-300000072741us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-09-300000072741us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-09-300000072741us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-09-300000072741us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-09-300000072741us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-09-3000000727412022-05-112022-05-110000072741us-gaap:SubsequentEventMembersrt:SubsidiariesMemberes:TheTorringtonWaterCompanyTWCMember2022-10-032022-10-030000072741us-gaap:SubsequentEventMembersrt:SubsidiariesMemberes:TheTorringtonWaterCompanyTWCMember2022-10-030000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:ResidentialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:ResidentialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:ResidentialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:ResidentialMember2022-07-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:ResidentialMember2022-07-012022-09-300000072741us-gaap:IntersegmentEliminationMemberes:ResidentialMember2022-07-012022-09-300000072741es:ResidentialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:CommercialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:CommercialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:CommercialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:CommercialMember2022-07-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:CommercialMember2022-07-012022-09-300000072741us-gaap:IntersegmentEliminationMemberes:CommercialMember2022-07-012022-09-300000072741es:CommercialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:IndustrialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:NaturalGasDistributionMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:IndustrialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:WaterDistributionSegmentMember2022-07-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:IndustrialMember2022-07-012022-09-300000072741es:IndustrialMemberus-gaap:IntersegmentEliminationMember2022-07-012022-09-300000072741es:IndustrialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:EversourceElectricDistributionMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:NaturalGasDistributionMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:EversourceElectricTransmissionMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:WaterDistributionSegmentMember2022-07-012022-09-300000072741es:TotalRetailSalesRevenueMemberus-gaap:CorporateNonSegmentMember2022-07-012022-09-300000072741es:TotalRetailSalesRevenueMemberus-gaap:IntersegmentEliminationMember2022-07-012022-09-300000072741es:TotalRetailSalesRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:WholesaleTransmissionRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:WholesaleTransmissionRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:WholesaleTransmissionRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleTransmissionRevenueMemberes:WaterDistributionSegmentMember2022-07-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:WholesaleTransmissionRevenueMember2022-07-012022-09-300000072741es:WholesaleTransmissionRevenueMemberus-gaap:IntersegmentEliminationMember2022-07-012022-09-300000072741es:WholesaleTransmissionRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:WholesaleMarketSalesRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:WholesaleMarketSalesRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:WholesaleMarketSalesRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleMarketSalesRevenueMemberes:WaterDistributionSegmentMember2022-07-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:WholesaleMarketSalesRevenueMember2022-07-012022-09-300000072741es:WholesaleMarketSalesRevenueMemberus-gaap:IntersegmentEliminationMember2022-07-012022-09-300000072741es:WholesaleMarketSalesRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741us-gaap:IntersegmentEliminationMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741es:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMemberes:WaterDistributionSegmentMember2022-07-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-07-012022-09-300000072741es:ReserveAdjustmentforRevenueSubjecttoRefundMemberus-gaap:IntersegmentEliminationMember2022-07-012022-09-300000072741es:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMember2022-07-012022-09-300000072741us-gaap:CorporateNonSegmentMember2022-07-012022-09-300000072741us-gaap:IntersegmentEliminationMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:ResidentialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:ResidentialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:ResidentialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:ResidentialMember2022-01-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:ResidentialMember2022-01-012022-09-300000072741us-gaap:IntersegmentEliminationMemberes:ResidentialMember2022-01-012022-09-300000072741es:ResidentialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:CommercialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:CommercialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:CommercialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:CommercialMember2022-01-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:CommercialMember2022-01-012022-09-300000072741us-gaap:IntersegmentEliminationMemberes:CommercialMember2022-01-012022-09-300000072741es:CommercialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:IndustrialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:NaturalGasDistributionMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:IndustrialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:WaterDistributionSegmentMember2022-01-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:IndustrialMember2022-01-012022-09-300000072741es:IndustrialMemberus-gaap:IntersegmentEliminationMember2022-01-012022-09-300000072741es:IndustrialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:EversourceElectricDistributionMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:NaturalGasDistributionMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:EversourceElectricTransmissionMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:WaterDistributionSegmentMember2022-01-012022-09-300000072741es:TotalRetailSalesRevenueMemberus-gaap:CorporateNonSegmentMember2022-01-012022-09-300000072741es:TotalRetailSalesRevenueMemberus-gaap:IntersegmentEliminationMember2022-01-012022-09-300000072741es:TotalRetailSalesRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:WholesaleTransmissionRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:WholesaleTransmissionRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:WholesaleTransmissionRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleTransmissionRevenueMemberes:WaterDistributionSegmentMember2022-01-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:WholesaleTransmissionRevenueMember2022-01-012022-09-300000072741es:WholesaleTransmissionRevenueMemberus-gaap:IntersegmentEliminationMember2022-01-012022-09-300000072741es:WholesaleTransmissionRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:WholesaleMarketSalesRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:WholesaleMarketSalesRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:WholesaleMarketSalesRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleMarketSalesRevenueMemberes:WaterDistributionSegmentMember2022-01-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:WholesaleMarketSalesRevenueMember2022-01-012022-09-300000072741es:WholesaleMarketSalesRevenueMemberus-gaap:IntersegmentEliminationMember2022-01-012022-09-300000072741es:WholesaleMarketSalesRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741us-gaap:IntersegmentEliminationMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741es:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMemberes:WaterDistributionSegmentMember2022-01-012022-09-300000072741us-gaap:CorporateNonSegmentMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-01-012022-09-300000072741es:ReserveAdjustmentforRevenueSubjecttoRefundMemberus-gaap:IntersegmentEliminationMember2022-01-012022-09-300000072741es:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMember2022-01-012022-09-300000072741us-gaap:CorporateNonSegmentMember2022-01-012022-09-300000072741us-gaap:IntersegmentEliminationMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:ResidentialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:ResidentialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:ResidentialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:ResidentialMember2021-07-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:ResidentialMember2021-07-012021-09-300000072741us-gaap:IntersegmentEliminationMemberes:ResidentialMember2021-07-012021-09-300000072741es:ResidentialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:CommercialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:CommercialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:CommercialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:CommercialMember2021-07-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:CommercialMember2021-07-012021-09-300000072741us-gaap:IntersegmentEliminationMemberes:CommercialMember2021-07-012021-09-300000072741es:CommercialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:IndustrialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:NaturalGasDistributionMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:IndustrialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:WaterDistributionSegmentMember2021-07-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:IndustrialMember2021-07-012021-09-300000072741es:IndustrialMemberus-gaap:IntersegmentEliminationMember2021-07-012021-09-300000072741es:IndustrialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:EversourceElectricDistributionMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:NaturalGasDistributionMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:EversourceElectricTransmissionMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:WaterDistributionSegmentMember2021-07-012021-09-300000072741es:TotalRetailSalesRevenueMemberus-gaap:CorporateNonSegmentMember2021-07-012021-09-300000072741es:TotalRetailSalesRevenueMemberus-gaap:IntersegmentEliminationMember2021-07-012021-09-300000072741es:TotalRetailSalesRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:WholesaleTransmissionRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:WholesaleTransmissionRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:WholesaleTransmissionRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleTransmissionRevenueMemberes:WaterDistributionSegmentMember2021-07-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:WholesaleTransmissionRevenueMember2021-07-012021-09-300000072741es:WholesaleTransmissionRevenueMemberus-gaap:IntersegmentEliminationMember2021-07-012021-09-300000072741es:WholesaleTransmissionRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:WholesaleMarketSalesRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:WholesaleMarketSalesRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:WholesaleMarketSalesRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleMarketSalesRevenueMemberes:WaterDistributionSegmentMember2021-07-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:WholesaleMarketSalesRevenueMember2021-07-012021-09-300000072741es:WholesaleMarketSalesRevenueMemberus-gaap:IntersegmentEliminationMember2021-07-012021-09-300000072741es:WholesaleMarketSalesRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741us-gaap:IntersegmentEliminationMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741es:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMemberes:WaterDistributionSegmentMember2021-07-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-07-012021-09-300000072741es:ReserveAdjustmentforRevenueSubjecttoRefundMemberus-gaap:IntersegmentEliminationMember2021-07-012021-09-300000072741es:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMember2021-07-012021-09-300000072741us-gaap:CorporateNonSegmentMember2021-07-012021-09-300000072741us-gaap:IntersegmentEliminationMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:ResidentialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:ResidentialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:ResidentialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:ResidentialMember2021-01-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:ResidentialMember2021-01-012021-09-300000072741us-gaap:IntersegmentEliminationMemberes:ResidentialMember2021-01-012021-09-300000072741es:ResidentialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:CommercialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:CommercialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:CommercialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:CommercialMember2021-01-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:CommercialMember2021-01-012021-09-300000072741us-gaap:IntersegmentEliminationMemberes:CommercialMember2021-01-012021-09-300000072741es:CommercialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:IndustrialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:NaturalGasDistributionMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:IndustrialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:WaterDistributionSegmentMember2021-01-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:IndustrialMember2021-01-012021-09-300000072741es:IndustrialMemberus-gaap:IntersegmentEliminationMember2021-01-012021-09-300000072741es:IndustrialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:EversourceElectricDistributionMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:NaturalGasDistributionMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:EversourceElectricTransmissionMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:WaterDistributionSegmentMember2021-01-012021-09-300000072741es:TotalRetailSalesRevenueMemberus-gaap:CorporateNonSegmentMember2021-01-012021-09-300000072741es:TotalRetailSalesRevenueMemberus-gaap:IntersegmentEliminationMember2021-01-012021-09-300000072741es:TotalRetailSalesRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:WholesaleTransmissionRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:WholesaleTransmissionRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:WholesaleTransmissionRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleTransmissionRevenueMemberes:WaterDistributionSegmentMember2021-01-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:WholesaleTransmissionRevenueMember2021-01-012021-09-300000072741es:WholesaleTransmissionRevenueMemberus-gaap:IntersegmentEliminationMember2021-01-012021-09-300000072741es:WholesaleTransmissionRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:WholesaleMarketSalesRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:WholesaleMarketSalesRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:WholesaleMarketSalesRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleMarketSalesRevenueMemberes:WaterDistributionSegmentMember2021-01-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:WholesaleMarketSalesRevenueMember2021-01-012021-09-300000072741es:WholesaleMarketSalesRevenueMemberus-gaap:IntersegmentEliminationMember2021-01-012021-09-300000072741es:WholesaleMarketSalesRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741us-gaap:IntersegmentEliminationMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741es:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMemberes:WaterDistributionSegmentMember2021-01-012021-09-300000072741us-gaap:CorporateNonSegmentMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-01-012021-09-300000072741es:ReserveAdjustmentforRevenueSubjecttoRefundMemberus-gaap:IntersegmentEliminationMember2021-01-012021-09-300000072741es:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WaterDistributionSegmentMember2021-01-012021-09-300000072741us-gaap:CorporateNonSegmentMember2021-01-012021-09-300000072741us-gaap:IntersegmentEliminationMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TheConnecticutLightAndPowerCompanyMemberes:ResidentialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:ResidentialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:ResidentialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TheConnecticutLightAndPowerCompanyMemberes:ResidentialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:ResidentialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:ResidentialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:CommercialMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:CommercialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:CommercialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:CommercialMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:CommercialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:CommercialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:IndustrialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:IndustrialMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:IndustrialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:IndustrialMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:NstarElectricCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:NstarElectricCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleTransmissionRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:WholesaleTransmissionRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:WholesaleTransmissionRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleTransmissionRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:WholesaleTransmissionRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:WholesaleTransmissionRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleMarketSalesRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:WholesaleMarketSalesRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:WholesaleMarketSalesRevenueMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleMarketSalesRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:WholesaleMarketSalesRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:WholesaleMarketSalesRevenueMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-07-012021-09-300000072741srt:ConsolidationEliminationsMemberes:TheConnecticutLightAndPowerCompanyMember2022-07-012022-09-300000072741srt:ConsolidationEliminationsMemberes:NstarElectricCompanyMember2022-07-012022-09-300000072741srt:ConsolidationEliminationsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-07-012022-09-300000072741srt:ConsolidationEliminationsMemberes:TheConnecticutLightAndPowerCompanyMember2021-07-012021-09-300000072741srt:ConsolidationEliminationsMemberes:NstarElectricCompanyMember2021-07-012021-09-300000072741srt:ConsolidationEliminationsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TheConnecticutLightAndPowerCompanyMemberes:ResidentialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:ResidentialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:ResidentialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TheConnecticutLightAndPowerCompanyMemberes:ResidentialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:ResidentialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:ResidentialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:CommercialMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:CommercialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:CommercialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:CommercialMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:CommercialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:CommercialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:IndustrialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:IndustrialMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:IndustrialMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:IndustrialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:IndustrialMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:NstarElectricCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:NstarElectricCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TotalRetailSalesRevenueMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleTransmissionRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:WholesaleTransmissionRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:WholesaleTransmissionRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleTransmissionRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:WholesaleTransmissionRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:WholesaleTransmissionRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleMarketSalesRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:WholesaleMarketSalesRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:WholesaleMarketSalesRevenueMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:WholesaleMarketSalesRevenueMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:WholesaleMarketSalesRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:WholesaleMarketSalesRevenueMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:OtherRevenueAdjustmentsfromContractswithCustomersMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMemberes:ReserveAdjustmentforRevenueSubjecttoRefundMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:NstarElectricCompanyMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-01-012021-09-300000072741srt:ConsolidationEliminationsMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741srt:ConsolidationEliminationsMemberes:NstarElectricCompanyMember2022-01-012022-09-300000072741srt:ConsolidationEliminationsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2022-01-012022-09-300000072741srt:ConsolidationEliminationsMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-09-300000072741srt:ConsolidationEliminationsMemberes:NstarElectricCompanyMember2021-01-012021-09-300000072741srt:ConsolidationEliminationsMemberes:PublicServiceCompanyOfNewHampshirePSNHMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:ReservesForRevenuesSubjectToRefundMemberus-gaap:UnfavorableRegulatoryActionMemberes:TheConnecticutLightAndPowerCompanyMember2021-01-012021-12-310000072741us-gaap:SalesMemberus-gaap:UnfavorableRegulatoryActionMemberes:TheConnecticutLightAndPowerCompanyMember2022-01-012022-09-300000072741us-gaap:UnfavorableRegulatoryActionMemberes:TheConnecticutLightAndPowerCompanyMember2021-09-010000072741srt:AffiliatedEntityMember2022-01-012022-09-30es:reportableSegment0000072741us-gaap:OperatingSegmentsMemberes:EversourceWaterMember2022-07-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceWaterMember2022-01-012022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceWaterMember2021-07-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceWaterMember2021-01-012021-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMember2022-09-300000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMember2022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMember2022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceWaterMember2022-09-300000072741us-gaap:CorporateNonSegmentMember2022-09-300000072741us-gaap:IntersegmentEliminationMember2022-09-300000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricDistributionMember2021-12-310000072741us-gaap:OperatingSegmentsMemberes:NaturalGasDistributionMember2021-12-310000072741us-gaap:OperatingSegmentsMemberes:EversourceElectricTransmissionMember2021-12-310000072741us-gaap:OperatingSegmentsMemberes:EversourceWaterMember2021-12-310000072741us-gaap:CorporateNonSegmentMember2021-12-310000072741us-gaap:IntersegmentEliminationMember2021-12-31

es-20220930_g1.jpg

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM10-Q
QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
For the Quarterly Period EndedSeptember 30, 2022
or
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE     
SECURITIES EXCHANGE ACT OF 1934

For the transition period from ____________ to ____________

Registrant; State of Incorporation; Address; Telephone Number;
Commission File Number; and I.R.S. Employer Identification No.


EVERSOURCE ENERGY
(a Massachusetts voluntary association)
300 Cadwell Drive, Springfield, Massachusetts 01104
Telephone: (800) 286-5000
Commission File Number: 001-05324
I.R.S. Employer Identification No. 04-2147929


THE CONNECTICUT LIGHT AND POWER COMPANY
(a Connecticut corporation)
107 Selden Street, Berlin, Connecticut 06037-1616
Telephone: (800) 286-5000
Commission File Number: 000-00404
I.R.S. Employer Identification No. 06-0303850


NSTAR ELECTRIC COMPANY
(a Massachusetts corporation)
800 Boylston Street, Boston, Massachusetts 02199
Telephone: (800) 286-5000
Commission File Number: 001-02301
I.R.S. Employer Identification No. 04-1278810


PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE
(a New Hampshire corporation)
Energy Park
780 North Commercial Street, Manchester, New Hampshire 03101-1134
Telephone: (800) 286-5000
Commission File Number: 001-06392
I.R.S. Employer Identification No. 02-0181050

Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common Shares, $5.00 par value per shareESNew York Stock Exchange

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

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

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Eversource EnergyLarge accelerated filerAccelerated
filer
Non-accelerated
filer
Smaller reporting companyEmerging growth company
The Connecticut Light and Power CompanyLarge accelerated filerAccelerated
filer
Non-accelerated filerSmaller reporting companyEmerging growth company
NSTAR Electric CompanyLarge accelerated filerAccelerated
filer
Non-accelerated filerSmaller reporting companyEmerging growth company
Public Service Company of New HampshireLarge accelerated filerAccelerated
filer
Non-accelerated filerSmaller reporting companyEmerging growth company

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

Indicate by check mark whether the registrants are shell companies (as defined in Rule 12b-2 of the Exchange Act):
YesNo
Eversource Energy
The Connecticut Light and Power Company
NSTAR Electric Company
Public Service Company of New Hampshire

Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the latest practicable date.
Company - Class of StockOutstanding as of October 31, 2022
Eversource Energy Common Shares, $5.00 par value348,307,416 shares
The Connecticut Light and Power Company Common Stock, $10.00 par value6,035,205 shares
NSTAR Electric Company Common Stock, $1.00 par value200 shares
Public Service Company of New Hampshire Common Stock, $1.00 par value301 shares

Eversource Energy holds all of the 6,035,205 shares, 200 shares, and 301 shares of the outstanding common stock of The Connecticut Light and Power Company, NSTAR Electric Company, and Public Service Company of New Hampshire, respectively.

NSTAR Electric Company and Public Service Company of New Hampshire each meet the conditions set forth in General Instruction H(1)(a) and (b) of Form 10-Q, and each is therefore filing this Form 10-Q with the reduced disclosure format specified in General Instruction H(2) of Form 10‑Q.

Eversource Energy, The Connecticut Light and Power Company, NSTAR Electric Company, and Public Service Company of New Hampshire each separately file this combined Form 10-Q.  Information contained herein relating to any individual registrant is filed by such registrant on its own behalf.  Each registrant makes no representation as to information relating to the other registrants.



GLOSSARY OF TERMS

The following is a glossary of abbreviations and acronyms that are found in this report:

Current or former Eversource Energy companies, segments or investments:
Eversource, ES or the CompanyEversource Energy and subsidiaries
Eversource parent or ES parentEversource Energy, a public utility holding company
ES parent and other companiesES parent and other companies are comprised of Eversource parent, Eversource Service, and other subsidiaries, which primarily includes our unregulated businesses, HWP Company, The Rocky River Realty Company (a real estate subsidiary), the consolidated operations of CYAPC and YAEC, and Eversource parent's equity ownership interests that are not consolidated
CL&PThe Connecticut Light and Power Company
NSTAR ElectricNSTAR Electric Company
PSNHPublic Service Company of New Hampshire
PSNH FundingPSNH Funding LLC 3, a bankruptcy remote, special purpose, wholly-owned subsidiary of PSNH
NSTAR GasNSTAR Gas Company
EGMAEversource Gas Company of Massachusetts
Yankee GasYankee Gas Services Company
AquarionAquarion Company and its subsidiaries
HEECHarbor Electric Energy Company, a wholly-owned subsidiary of NSTAR Electric
Eversource ServiceEversource Energy Service Company
North East OffshoreNorth East Offshore, LLC, an offshore wind business being developed jointly by Eversource and Denmark-based Ørsted
CYAPCConnecticut Yankee Atomic Power Company
MYAPCMaine Yankee Atomic Power Company
YAECYankee Atomic Electric Company
Yankee CompaniesCYAPC, YAEC and MYAPC
Regulated companiesThe Eversource regulated companies are comprised of the electric distribution and transmission businesses of CL&P, NSTAR Electric and PSNH, the natural gas distribution businesses of Yankee Gas, NSTAR Gas and EGMA, Aquarion’s water distribution businesses, and the solar power facilities of NSTAR Electric
Regulators and Government Agencies:
BOEM
U.S. Bureau of Ocean Energy Management
DEEPConnecticut Department of Energy and Environmental Protection
DOEU.S. Department of Energy
DOERMassachusetts Department of Energy Resources
DPUMassachusetts Department of Public Utilities
EPAU.S. Environmental Protection Agency
FERCFederal Energy Regulatory Commission
ISO-NEISO New England, Inc., the New England Independent System Operator
MA DEPMassachusetts Department of Environmental Protection
NHPUCNew Hampshire Public Utilities Commission
PURAConnecticut Public Utilities Regulatory Authority
SECU.S. Securities and Exchange Commission
Other Terms and Abbreviations:
ADITAccumulated Deferred Income Taxes
AFUDCAllowance For Funds Used During Construction
AOCIAccumulated Other Comprehensive Income
AROAsset Retirement Obligation
BcfBillion cubic feet
CfDContract for Differences
CWIPConstruction Work in Progress
EDCElectric distribution company
EDITExcess Deferred Income Taxes
EPSEarnings Per Share
ERISAEmployee Retirement Income Security Act of 1974
ESOPEmployee Stock Ownership Plan
Eversource 2021 Form 10-KThe Eversource Energy and Subsidiaries 2021 combined Annual Report on Form 10-K as filed with the SEC
FitchFitch Ratings, Inc.
i


FMCCFederally Mandated Congestion Charge
GAAPAccounting principles generally accepted in the United States of America
GWhGigawatt-Hours
IPPIndependent Power Producers
ISO-NE TariffISO-NE FERC Transmission, Markets and Services Tariff
kVKilovolt
kVaKilovolt-ampere
kWKilowatt (equal to one thousand watts)
LNGLiquefied natural gas
LRSSupplier of last resort service
MGMillion gallons
MGPManufactured Gas Plant
MMBtuOne million British thermal units
MMcfMillion cubic feet
Moody'sMoody's Investors Services, Inc.
MWMegawatt
MWhMegawatt-Hours
NETOsNew England Transmission Owners (including Eversource, National Grid and Avangrid)
OCIOther Comprehensive Income/(Loss)
PAMPension and PBOP Rate Adjustment Mechanism
PBOPPostretirement Benefits Other Than Pension
PBOP PlanPostretirement Benefits Other Than Pension Plan
Pension PlanSingle uniform noncontributory defined benefit retirement plan
PPAPower purchase agreement
RECsRenewable Energy Certificates
Regulatory ROEThe average cost of capital method for calculating the return on equity related to the distribution business segment excluding the wholesale transmission segment
ROEReturn on Equity
RRBsRate Reduction Bonds or Rate Reduction Certificates
RSUsRestricted share units
S&PStandard & Poor's Financial Services LLC
SERPSupplemental Executive Retirement Plans and non-qualified defined benefit retirement plans
SSStandard service
UIThe United Illuminating Company
VIEVariable Interest Entity
ii


EVERSOURCE ENERGY AND SUBSIDIARIES   
THE CONNECTICUT LIGHT AND POWER COMPANY
NSTAR ELECTRIC COMPANY AND SUBSIDIARY
PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES

TABLE OF CONTENTS
 Page
PART IFINANCIAL INFORMATION
   
ITEM 1.
Financial Statements (Unaudited)
   
 
Eversource Energy and Subsidiaries (Unaudited)
 
 
 
Condensed Consolidated Statements of Comprehensive Income
Condensed Consolidated Statements of Common Shareholders' Equity
 
  
 
The Connecticut Light and Power Company (Unaudited)
 
 
 
Condensed Statements of Comprehensive Income
Condensed Statements of Common Stockholder's Equity
 
  
 
NSTAR Electric Company and Subsidiary (Unaudited)
 
 
 
Condensed Consolidated Statements of Comprehensive Income
Condensed Consolidated Statements of Common Stockholder's Equity
 
  
 Public Service Company of New Hampshire and Subsidiaries (Unaudited)
 
 
 
Condensed Consolidated Statements of Comprehensive Income
Condensed Consolidated Statements of Common Stockholder's Equity
 
  
 
   
 
Eversource Energy and Subsidiaries
 
The Connecticut Light and Power Company, NSTAR Electric Company and Subsidiary, and
Public Service Company of New Hampshire and Subsidiaries
  
   
   
PART II – OTHER INFORMATION
   
  
ITEM 1A.
Risk Factors
  
ITEM 2.
Unregistered Sales of Equity Securities and Use of Proceeds
  
  
SIGNATURES

iii


EVERSOURCE ENERGY AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
(Thousands of Dollars)As of September 30, 2022As of December 31, 2021
ASSETS  
Current Assets:  
Cash $45,716 $66,773 
Cash Equivalents (Note 6)440,000  
Receivables, Net (net of allowance for uncollectible accounts of $457,645
   and $417,406 as of September 30, 2022 and December 31, 2021, respectively)
1,453,785 1,226,069 
Unbilled Revenues181,176 210,879 
Fuel, Materials, Supplies and REC Inventory322,216 267,547 
Regulatory Assets1,143,646 1,129,093 
Prepayments and Other Current Assets333,115 369,759 
Total Current Assets3,919,654 3,270,120 
Property, Plant and Equipment, Net35,029,497 33,377,650 
Deferred Debits and Other Assets:  
Regulatory Assets4,558,776 4,586,709 
Goodwill4,477,756 4,477,269 
Investments in Unconsolidated Affiliates2,053,404 1,436,293 
Prepaid Pension and PBOP561,012 271,987 
Marketable Securities377,183 460,347 
Other Long-Term Assets622,143 611,769 
Total Deferred Debits and Other Assets12,650,274 11,844,374 
Total Assets$51,599,425 $48,492,144 
LIABILITIES AND CAPITALIZATION  
Current Liabilities:  
Notes Payable$401,500 $1,505,450 
Long-Term Debt – Current Portion1,610,468 1,193,097 
Rate Reduction Bonds – Current Portion43,210 43,210 
Accounts Payable1,459,606 1,672,230 
Regulatory Liabilities988,714 602,432 
Other Current Liabilities983,663 830,620 
Total Current Liabilities5,487,161 5,847,039 
Deferred Credits and Other Liabilities:  
Accumulated Deferred Income Taxes4,830,158 4,597,120 
Regulatory Liabilities3,901,106 3,866,251 
Derivative Liabilities164,253 235,387 
Asset Retirement Obligations505,937 500,111 
Accrued Pension, SERP and PBOP159,217 242,463 
Other Long-Term Liabilities874,391 971,080 
Total Deferred Credits and Other Liabilities10,435,062 10,412,412 
Long-Term Debt19,831,967 17,023,577 
Rate Reduction Bonds410,492 453,702 
Noncontrolling Interest – Preferred Stock of Subsidiaries155,570 155,570 
Common Shareholders' Equity: 
Common Shares1,799,920 1,789,092 
Capital Surplus, Paid In8,327,477 8,098,514 
Retained Earnings5,429,076 5,005,391 
Accumulated Other Comprehensive Loss(41,006)(42,275)
Treasury Stock(236,294)(250,878)
Common Shareholders' Equity15,279,173 14,599,844 
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization$51,599,425 $48,492,144 

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.
1


EVERSOURCE ENERGY AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
(Unaudited)
 For the Three Months Ended September 30,For the Nine Months Ended September 30,
(Thousands of Dollars, Except Share Information)2022202120222021
Operating Revenues$3,215,645 $2,432,794 $9,259,596 $7,381,172 
Operating Expenses:    
Purchased Power, Fuel and Transmission1,388,041 880,639 3,718,278 2,529,217 
Operations and Maintenance454,289 389,065 1,378,897 1,265,754 
Depreciation302,143 276,846 885,711 822,197 
Amortization111,287 45,236 418,644 158,860 
Energy Efficiency Programs162,545 143,796 498,708 460,814 
Taxes Other Than Income Taxes240,047 213,881 683,441 623,827 
Total Operating Expenses2,658,352 1,949,463 7,583,679 5,860,669 
Operating Income557,293 483,331 1,675,917 1,520,503 
Interest Expense178,174 147,962 491,509 431,162 
Other Income, Net89,831 43,768 255,253 124,588 
Income Before Income Tax Expense468,950