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SCHEDULE I - FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF COMPREHENSIVE INCOME(LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Comprehensive Income/(Loss), Net of Tax:      
Qualified Cash Flow Hedging Instruments $ 20 $ 20 $ 20
Changes in Unrealized Gains/(Losses) on Marketable Securities 0 1,252 (1,636)
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans 7,245 4,412 4,470
Other Comprehensive Income, Net of Tax 7,265 5,684 2,854
Comprehensive Income/(Loss) 818,918 (436,556) 1,407,729
Eversource      
Condensed Statement of Income Captions [Line Items]      
Net Income/(Loss) 811,653 (442,240) 1,404,875
Other Comprehensive Income/(Loss), Net of Tax:      
Qualified Cash Flow Hedging Instruments 20 20 20
Changes in Unrealized Gains/(Losses) on Marketable Securities 0 1,252 (1,636)
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans 7,245 4,412 4,470
Other Comprehensive Income, Net of Tax 7,265 5,684 2,854
Comprehensive Income/(Loss) $ 818,918 $ (436,556) $ 1,407,729