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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Income Statements, Captions [Line Items]      
Interest Expense on RRB Principal (included in Interest Expense) $ 1,111,336 $ 855,441 $ 678,274
PSNH      
Condensed Income Statements, Captions [Line Items]      
Interest Expense on RRB Principal (included in Interest Expense) 77,770 72,786 59,548
Variable Interest Entity, Primary Beneficiary | PSNH | Rate Reduction Bonds      
Condensed Income Statements, Captions [Line Items]      
Amortization of RRB Principal (included in Amortization of Regulatory Assets/(Liabilities), Net) 43,200 43,200 43,200
Interest Expense on RRB Principal (included in Interest Expense) $ 14,300 $ 15,700 $ 17,000