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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Income Statements (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Condensed Income Statements, Captions [Line Items] |  |
Interest Expense on RRB Principal (included in Interest Expense) | $ 194,543 | $ 153,245
PSNH |  |
Condensed Income Statements, Captions [Line Items] |  |
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) | 5,317 | (26,834)
Interest Expense on RRB Principal (included in Interest Expense) | 17,542 | 13,645
PSNH | VIE | Rate Reduction Bonds |  |
Condensed Income Statements, Captions [Line Items] |  |
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) | 10,800 | 10,800
Interest Expense on RRB Principal (included in Interest Expense) | $ 4,100 | $ 4,400

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