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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Income Statements (Details) - PSNH - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Condensed Income Statements, Captions [Line Items] |  |  |  |
Amortization of RRB Principal (included in Amortization of Regulatory Assets/(Liabilities), Net) | $ (26,829) | $ (28,729) | $ (47,665) | $ (49,993)
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 | 21,600 | 21,600
Interest Expense on RRB Principal (included in Interest Expense) | $ 3,300 | $ 3,600 | $ 6,600 | $ 7,300

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