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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Schedule of 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 March 31, 2026:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $128.2 $116.2 $94.6 $43.0 $33.6 $— $— 
Long-Term Debt29,504.2 28,026.9 5,110.7 4,767.4 5,946.7 5,683.4 2,031.9 1,851.6 
Rate Reduction Bonds302.5 294.3 — — — — 302.5 294.3 
As of December 31, 2025:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $126.1 $116.2 $92.9 $43.0 $33.2 $— $— 
Long-Term Debt28,265.4 27,055.5 5,110.1 4,844.7 5,945.6 5,752.6 2,031.3 1,874.8 
Rate Reduction Bonds324.1 320.2 — — — — 324.1 320.2