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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 6,389,200 | $ 5,578,300
Regulatory Liabilities | 4,022,923 | 3,930,305
Accrued Interest (included in Other Current Liabilities) | 1,081,981 | 989,053
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | $ 367,282 | $ 410,492
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
Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | $ 17,300 | $ 19,600
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Assets | Other Long-Term Assets
Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 392,500 | $ 435,700
Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 339,000 | 322,500
PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 963,300 | 696,200
Regulatory Liabilities | 393,574 | 391,628
Accrued Interest (included in Other Current Liabilities) | 72,328 | 59,616
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 367,282 | 410,492
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) | 392,500 | 435,700
PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 8,000 | 14,400
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 | 367,300 | 410,500
Variable Interest Entity, Primary Beneficiary | PSNH | Other Current Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 30,000 | 32,400
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 | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 392,500 | 435,700
Variable Interest Entity, Primary Beneficiary | PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Regulatory Liabilities | 5,300 | 6,000
Accrued Interest (included in Other Current Liabilities) | $ 6,300 | $ 6,900

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