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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Income Statements, Captions [Line Items] |  |  |
Interest Expense on RRB Principal (included in Interest Expense) | $ 582,334 | $ 538,452 | $ 533,197
Public Service Company of New Hampshire |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Amortization of Regulatory Assets, Net | 86,832 | 52,804 | 57,732
Interest Expense on RRB Principal (included in Interest Expense) | 56,998 | 58,127 | 60,666
Variable Interest Entity, Primary Beneficiary | Public Service Company of New Hampshire | Rate Reduction Bonds |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Amortization of Regulatory Assets, Net | 43,200 | 43,200 | 43,000
Interest Expense on RRB Principal (included in Interest Expense) | $ 18,400 | $ 19,700 | $ 21,100

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