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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Condensed Income Statements, Captions [Line Items] |  |  |  |
Interest Expense on RRB Principal (included in Interest Expense) | $ 222,283 | $ 178,174 | $ 624,140 | $ 491,509
PSNH |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) | 9,963 | (7,398) | 35,234 | (43,449)
Interest Expense on RRB Principal (included in Interest Expense) | 19,252 | 15,030 | 55,901 | 43,432
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 | 32,400 | 32,400
Interest Expense on RRB Principal (included in Interest Expense) | $ 3,900 | $ 4,200 | $ 11,900 | $ 12,900

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