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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 5,715,800 | $ 6,569,900
Regulatory Liabilities | 3,866,251 | 3,850,781
Accrued Interest (included in Other Current Liabilities) | 830,620 | 809,214
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 453,702 | 496,912
Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 478,900 | 522,100
Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 150,000 | 161,000
Special Deposits |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 78,200 | 73,600
Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 44,700 | 43,600
Public Service Company of New Hampshire |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 786,400 | 989,100
Regulatory Liabilities | 381,366 | 383,183
Accrued Interest (included in Other Current Liabilities) | 63,005 | 58,487
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 453,702 | 496,912
Public Service Company of New Hampshire | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 478,900 | 522,100
Public Service Company of New Hampshire | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 15,800 | 20,900
Public Service Company of New Hampshire | Special Deposits |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 31,400 | 36,800
Public Service Company of New Hampshire | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash |  | 2,100
Variable Interest Entity, Primary Beneficiary | Public Service Company of New Hampshire |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Rate Reduction Bonds - Current Portion | 43,200 | 43,200
Rate Reduction Bonds - Long-Term Portion | 453,700 | 496,900
Variable Interest Entity, Primary Beneficiary | Public Service Company of New Hampshire | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 478,900 | 522,100
Variable Interest Entity, Primary Beneficiary | Public Service Company of New Hampshire | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Regulatory Liabilities | 5,400 | 9,100
Accrued Interest (included in Other Current Liabilities) | 7,500 | 8,000
Variable Interest Entity, Primary Beneficiary | Public Service Company of New Hampshire | Special Deposits |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 31,100 | 36,800
Variable Interest Entity, Primary Beneficiary | Public Service Company of New Hampshire | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | $ 3,200 | $ 2,100

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