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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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