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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 5,578,300 | $ 5,715,800
Regulatory Liabilities | 3,930,305 | 3,866,251
Accrued Interest (included in Other Current Liabilities) | 989,053 | 830,620
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 410,492 | 453,702
Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | $ 19,600 | $ 44,700
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Assets | Other Long-Term Assets
Other Current Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] | Prepayments and Other Current Assets | Prepayments and Other Current Assets
Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 435,700 | $ 478,900
Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 322,500 | 150,000
PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 696,200 | 786,400
Regulatory Liabilities | 391,628 | 381,366
Accrued Interest (included in Other Current Liabilities) | 59,616 | 63,005
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 410,492 | 453,702
PSNH | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 3,200 | 3,200
PSNH | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 435,700 | 478,900
PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 14,400 | 15,800
Variable Interest Entity, Primary Beneficiary | PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Rate Reduction Bonds - Current Portion | 43,200 | 43,200
Rate Reduction Bonds - Long-Term Portion | 410,500 | 453,700
Variable Interest Entity, Primary Beneficiary | PSNH | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 3,200 | 3,200
Variable Interest Entity, Primary Beneficiary | PSNH | Other Current Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 32,400 | 31,100
Variable Interest Entity, Primary Beneficiary | PSNH | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 435,700 | 478,900
Variable Interest Entity, Primary Beneficiary | PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Regulatory Liabilities | 6,000 | 5,400
Accrued Interest (included in Other Current Liabilities) | $ 6,900 | $ 7,500

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