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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 7,070,700 | $ 6,389,200
Regulatory Liabilities | 4,032,564 | 4,022,923
Accrued Interest (included in Other Current Liabilities) | 868,491 | 821,404
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | $ 324,072 | $ 367,282
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 | $ 9,000 | $ 17,300
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) | $ 349,300 | $ 392,500
Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 510,000 | 339,000
PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 1,065,700 | 963,300
Regulatory Liabilities | 394,982 | 393,574
Accrued Interest (included in Other Current Liabilities) | 92,018 | 72,328
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 324,072 | 367,282
PSNH | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 3,100 | 3,200
PSNH | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 349,300 | 392,500
PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 3,700 | 8,000
Variable Interest Entity, Primary Beneficiary | PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Regulatory Liabilities | 6,900 | 5,300
Accrued Interest (included in Other Current Liabilities) | 5,700 | 6,300
Rate Reduction Bonds - Current Portion | 43,200 | 43,200
Rate Reduction Bonds - Long-Term Portion | 324,100 | 367,300
Variable Interest Entity, Primary Beneficiary | PSNH | Other Current Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 31,000 | 30,000
Variable Interest Entity, Primary Beneficiary | PSNH | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 3,100 | 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) | $ 349,300 | $ 392,500

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