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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Carrying Amounts and Estimated Fair Values of Financial Instruments Carrying amounts and estimated fair values are as follows:
 EversourceCL&PNSTAR ElectricPSNH
(Millions of Dollars)Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
As of September 30, 2025:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $127.7 $116.2 $93.5 $43.0 $34.2 $— $— 
Long-Term Debt27,994.4 26,900.5 5,509.3 5,268.3 5,889.6 5,719.4 2,030.8 1,893.8 
Rate Reduction Bonds324.1 319.1 — — — — 324.1 319.1 
As of December 31, 2024:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $123.8 $116.2 $90.3 $43.0 $33.5 $— $— 
Long-Term Debt26,704.8 24,791.4 5,111.1 4,705.8 5,094.9 4,759.4 1,732.1 1,529.7 
Rate Reduction Bonds367.3 352.1 — — — — 367.3 352.1