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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Income Statements, Captions [Line Items] |  |  |
Interest Expense on RRB Principal (included in Interest Expense) | $ 855,441 | $ 678,274 | $ 582,334
PSNH |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Interest Expense on RRB Principal (included in Interest Expense) | 72,786 | 59,548 | 56,998
Variable Interest Entity, Primary Beneficiary | PSNH | Rate Reduction Bonds |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Amortization of RRB Principal (included in Amortization of Regulatory (Liabilities)/Assets, Net) | 43,200 | 43,200 | 43,200
Interest Expense on RRB Principal (included in Interest Expense) | $ 15,700 | $ 17,000 | $ 18,400

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