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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Condensed Income Statements, Captions [Line Items] |  |  |  |
Interest Expense on RRB Principal (included in Interest Expense) | $ 147,962 | $ 134,066 | $ 431,162 | $ 403,067
PSNH |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) | (17,922) | (7,360) | (62,744) | (39,034)
Interest Expense on RRB Principal (included in Interest Expense) | 14,321 | 14,942 | 42,774 | 44,029
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) | $ 4,500 | $ 4,900 | $ 13,900 | $ 14,900

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