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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 5,732,600 | $ 5,715,800
Regulatory Liabilities | 3,886,914 | 3,866,251
Accrued Interest (included in Other Current Liabilities) | 739,833 | 830,620
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 432,097 | 453,702
Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 457,300 | 478,900
Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 189,500 | 150,000
Current Derivative Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 90,800 | 78,200
Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 19,200 | 44,700
PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 736,900 | 786,400
Regulatory Liabilities | 393,673 | 381,366
Accrued Interest (included in Other Current Liabilities) | 54,772 | 63,005
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 432,097 | 453,702
PSNH | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Rate Reduction Bonds - Current Portion | 43,200 | 43,200
Rate Reduction Bonds - Long-Term Portion | 432,100 | 453,700
PSNH | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 457,300 | 478,900
PSNH | Securitized Stranded Costs | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 457,300 | 478,900
PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 15,200 | 15,800
PSNH | Other Regulatory Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Regulatory Liabilities | 5,200 | 5,400
Accrued Interest (included in Other Current Liabilities) | 7,200 | 7,500
PSNH | Current Derivative Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 30,900 | 31,400
PSNH | Current Derivative Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 30,700 | 31,100
PSNH | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 3,200 | 3,200
PSNH | Other Long-Term Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | $ 3,200 | $ 3,200

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