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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Condensed Income Statements, Captions [Line Items] |  |  |  |
Interest Expense on RRB Principal (included in Interest Expense) | $ 300,600 | $ 222,300 | $ 822,600 | $ 624,100
PSNH |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Amortization of RRB Principal (included in Amortization of Regulatory Assets/(Liabilities), Net) | (51,881) | 9,963 | (101,874) | 35,234
PSNH | VIE | Rate Reduction Bonds |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Amortization of RRB Principal (included in Amortization of Regulatory Assets/(Liabilities), Net) | 10,800 | 10,800 | 32,400 | 32,400
Interest Expense on RRB Principal (included in Interest Expense) | $ 3,500 | $ 3,900 | $ 10,800 | $ 11,900

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