v3.25.2
RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Balance Sheets (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Condensed Balance Sheet Statements, Captions [Line Items]    
Securitized Stranded Cost (included in Regulatory Assets) $ 6,731,900 $ 7,070,700
Other Regulatory Liabilities (included in Regulatory Liabilities) 4,076,390 4,032,564
Accrued Interest (included in Other Current Liabilities) 849,488 868,491
Rate Reduction Bonds - Current Portion 43,210 43,210
Rate Reduction Bonds - Long-Term Portion 302,467 324,072
Securitized Stranded Costs    
Condensed Balance Sheet Statements, Captions [Line Items]    
Securitized Stranded Cost (included in Regulatory Assets) 327,700 349,300
Other Regulatory Assets    
Condensed Balance Sheet Statements, Captions [Line Items]    
Securitized Stranded Cost (included in Regulatory Assets) 319,800 311,600
Current Derivative Assets    
Condensed Balance Sheet Statements, Captions [Line Items]    
Restricted Cash 67,600 75,800
Other Long-Term Assets    
Condensed Balance Sheet Statements, Captions [Line Items]    
Restricted Cash 8,900 9,000
PSNH    
Condensed Balance Sheet Statements, Captions [Line Items]    
Securitized Stranded Cost (included in Regulatory Assets) 1,014,100 1,065,700
Other Regulatory Liabilities (included in Regulatory Liabilities) 402,644 394,982
Accrued Interest (included in Other Current Liabilities) 61,113 62,956
Rate Reduction Bonds - Current Portion 43,210 43,210
Rate Reduction Bonds - Long-Term Portion 302,467 324,072
PSNH | VIE    
Condensed Balance Sheet Statements, Captions [Line Items]    
Rate Reduction Bonds - Current Portion 43,200 43,200
Rate Reduction Bonds - Long-Term Portion 302,500 324,100
PSNH | Securitized Stranded Costs    
Condensed Balance Sheet Statements, Captions [Line Items]    
Securitized Stranded Cost (included in Regulatory Assets) 327,700 349,300
PSNH | Securitized Stranded Costs | VIE    
Condensed Balance Sheet Statements, Captions [Line Items]    
Securitized Stranded Cost (included in Regulatory Assets) 327,700 349,300
PSNH | Other Regulatory Assets    
Condensed Balance Sheet Statements, Captions [Line Items]    
Securitized Stranded Cost (included in Regulatory Assets) 3,300 3,700
PSNH | Other Regulatory Assets | VIE    
Condensed Balance Sheet Statements, Captions [Line Items]    
Other Regulatory Liabilities (included in Regulatory Liabilities) 7,000 6,900
Accrued Interest (included in Other Current Liabilities) 5,400 5,700
PSNH | Current Derivative Assets    
Condensed Balance Sheet Statements, Captions [Line Items]    
Restricted Cash 31,300 32,700
PSNH | Current Derivative Assets | VIE    
Condensed Balance Sheet Statements, Captions [Line Items]    
Restricted Cash 30,700 31,000
PSNH | Other Long-Term Assets    
Condensed Balance Sheet Statements, Captions [Line Items]    
Restricted Cash 3,200 3,100
PSNH | Other Long-Term Assets | VIE    
Condensed Balance Sheet Statements, Captions [Line Items]    
Restricted Cash $ 3,200 $ 3,100