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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | $ 7,018,000 | $ 6,389,200
Regulatory Liabilities | 4,124,761 | 4,022,923
Accrued Interest (included in Other Current Liabilities) | 781,871 | 821,404
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 324,072 | 367,282
Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 360,100 | 392,500
Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 430,600 | 339,000
Current Derivative Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 66,500 | 81,500
Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 16,900 | 17,300
PSNH |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 1,075,200 | 963,300
Regulatory Liabilities | 393,847 | 393,574
Accrued Interest (included in Other Current Liabilities) | 50,269 | 46,545
Rate Reduction Bonds - Current Portion | 43,210 | 43,210
Rate Reduction Bonds - Long-Term Portion | 324,072 | 367,282
PSNH | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Rate Reduction Bonds - Current Portion | 43,200 | 43,200
Rate Reduction Bonds - Long-Term Portion | 324,100 | 367,300
PSNH | Securitized Stranded Costs |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 360,100 | 392,500
PSNH | Securitized Stranded Costs | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 360,100 | 392,500
PSNH | Other Regulatory Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securitized Stranded Cost (included in Regulatory Assets) | 4,800 | 8,000
PSNH | Other Regulatory Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Regulatory Liabilities | 7,500 | 5,300
Accrued Interest (included in Other Current Liabilities) | 2,300 | 6,300
PSNH | Current Derivative Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 18,900 | 31,600
PSNH | Current Derivative Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 17,300 | 30,000
PSNH | Other Long-Term Assets |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | 3,100 | 3,200
PSNH | Other Long-Term Assets | VIE |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Restricted Cash | $ 3,100 | $ 3,200

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