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REGULATORY ACCOUNTING (Tables)
9 Months Ended
Sep. 30, 2025
Regulated Operations [Abstract]  
Schedule of Components of Regulatory Assets The components of regulatory assets were as follows:
 As of September 30, 2025As of December 31, 2024
(Millions of Dollars)EversourceCL&PNSTAR
Electric
PSNHEversourceCL&PNSTAR
Electric
PSNH
Storm Costs, Net$1,955.4 $970.9 $520.9 $463.6 $2,039.4 $971.1 $609.8 $458.5 
Regulatory Tracking Mechanisms1,495.6 202.2 662.9 110.5 1,781.6 507.7 650.0 162.8 
Income Taxes, Net1,001.3 532.9 157.7 20.2 968.4 521.0 145.4 20.7 
Benefit Costs976.1 167.8 300.7 64.3 967.4 168.8 293.6 65.6 
Securitized Stranded Costs316.9 — — 316.9 349.3 — — 349.3 
Goodwill-related234.6 — 201.4 — 247.2 — 212.3 — 
Cost of Removal238.9 — 8.2 — 198.4 — 8.5 — 
Asset Retirement Obligations159.6 43.4 83.0 5.4 150.2 41.2 78.3 5.1 
Derivative Liabilities10.7 10.7 — — 57.2 57.2 — — 
Other Regulatory Assets281.0 19.6 94.6 3.1 311.6 58.5 109.2 3.7 
Total Regulatory Assets6,670.1 1,947.5 2,029.4 984.0 7,070.7 2,325.5 2,107.1 1,065.7 
Less:  Current Portion1,831.2 268.8 912.3 118.9 2,189.7 638.5 902.8 173.3 
Total Long-Term Regulatory Assets$4,838.9 $1,678.7 $1,117.1 $865.1 $4,881.0 $1,687.0 $1,204.3 $892.4 
Schedule of Components of Regulatory Liabilities The components of regulatory liabilities were as follows:
 As of September 30, 2025As of December 31, 2024
(Millions of Dollars)EversourceCL&PNSTAR
Electric
PSNHEversourceCL&PNSTAR
Electric
PSNH
EDIT due to Tax Cuts and Jobs Act of 2017$2,401.3 $946.0 $858.0 $323.6 $2,442.7 $956.6 $877.6 $330.6 
Regulatory Tracking Mechanisms1,129.2 443.6 520.1 97.0 702.4 180.3 413.6 114.4 
Cost of Removal764.7 258.9 468.4 37.4 684.1 212.8 451.3 20.1 
Deferred Portion of Non-Service Income
   Components of Pension, SERP and PBOP
488.6 70.0 242.5 47.1 427.1 61.6 211.6 42.6 
AFUDC - Transmission171.4 68.9 102.5 — 154.8 65.1 89.7 — 
Benefit Costs53.8 5.4 8.4 4.3 69.3 4.5 21.4 3.9 
Other Regulatory Liabilities169.4 39.0 13.6 4.0 184.5 39.1 14.2 4.5 
Total Regulatory Liabilities5,178.4 1,831.8 2,213.5 513.4 4,664.9 1,520.0 2,079.4 516.1 
Less:  Current Portion1,064.1 391.3 543.2 103.6 632.3 124.1 436.3 121.1 
Total Long-Term Regulatory Liabilities$4,114.3 $1,440.5 $1,670.3 $409.8 $4,032.6 $1,395.9 $1,643.1 $395.0