v3.25.2
FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 6 Months Ended
Jun. 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 June 30, 2025:        
Preferred Stock Not Subject to Mandatory Redemption
$155.6 $121.4 $116.2 $89.8 $43.0 $31.6 $— $— 
Long-Term Debt28,163.3 26,766.3 5,508.5 5,191.9 5,888.1 5,637.1 2,031.1 1,861.7 
Rate Reduction Bonds345.7 338.1 — — — — 345.7 338.1 
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