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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 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 5,739,900 | $ 5,578,300
Regulatory Liabilities | 3,974,374 | 3,930,305
Accrued Interest (included in Other Current Liabilities) | 1,078,421 | 989,053
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 388,887 | 410,492
Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 424,900 | 435,700
Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 286,500 | 322,500
Current Derivative Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 89,000 | 102,200
Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 19,900 | 19,600
PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 838,500 | 696,200
Regulatory Liabilities | 390,290 | 391,628
Accrued Interest (included in Other Current Liabilities) | 62,784 | 59,616
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 388,887 | 410,492
PSNH | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Rate Reduction Bonds - Current Portion | 43,200 | 43,200
Rate Reduction Bonds - Long-Term Portion | 388,900 | 410,500
PSNH | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 424,900 | 435,700
PSNH | Securitized Stranded Costs | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 424,900 | 435,700
PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 12,500 | 14,400
PSNH | Other Regulatory Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Regulatory Liabilities | 8,800 | 6,000
Accrued Interest (included in Other Current Liabilities) | 2,700 | 6,900
PSNH | Current Derivative Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 19,500 | 33,100
PSNH | Current Derivative Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 18,700 | 32,400
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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