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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Income Statements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Condensed Income Statements, Captions [Line Items]    
Interest Expense on RRB Principal (included in Interest Expense) $ 134,715 $ 131,734
PSNH    
Condensed Income Statements, Captions [Line Items]    
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) 20,110 13,667
Interest Expense on RRB Principal (included in Interest Expense) 14,479 14,367
PSNH | VIE | Rate Reduction Bonds    
Condensed Income Statements, Captions [Line Items]    
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) 10,800 10,600
Interest Expense on RRB Principal (included in Interest Expense) $ 5,000 $ 5,400