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REGULATORY ACCOUNTING (Tables)
 9 Months Ended
Sep. 30, 2024
Regulated Operations [Abstract]  
Components of Regulatory Assets The components of regulatory assets were as follows:
 As of September 30, 2024As of December 31, 2023
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Storm Costs, Net$2,077.2 $998.3 $626.3 $452.6 $1,785.9 $896.6 $609.1 $280.2 
Regulatory Tracking Mechanisms1,638.1 529.3 572.6 153.9 1,319.2 354.5 482.9 182.2 
Benefit Costs1,096.0 198.2 313.8 79.7 1,117.3 197.4 336.7 79.3 
Income Taxes, Net944.9 522.7 141.6 19.1 912.4 512.6 128.6 16.4 
Securitized Stranded Costs360.1 — — 360.1 392.5 — — 392.5 
Goodwill-related251.5 — 215.9 — 264.1 — 226.7 — 
Asset Retirement Obligations147.0 40.5 76.8 5.0 137.9 38.5 72.3 4.7 
Derivative Liabilities72.6 72.6 — — 120.9 120.9 — — 
Other Regulatory Assets430.6 65.1 102.8 4.8 339.0 22.7 101.6 8.0 
Total Regulatory Assets7,018.0 2,426.7 2,049.8 1,075.2 6,389.2 2,143.2 1,957.9 963.3 
Less:  Current Portion2,024.9 672.8 778.9 170.5 1,674.2 480.4 676.1 189.5 
Total Long-Term Regulatory Assets$4,993.1 $1,753.9 $1,270.9 $904.7 $4,715.0 $1,662.8 $1,281.8 $773.8 
Components of Regulatory Liabilities The components of regulatory liabilities were as follows:
 As of September 30, 2024As of December 31, 2023
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017$2,512.2 $960.1 $885.2 $333.7 $2,548.6 $969.2 $905.1 $339.3 
Regulatory Tracking Mechanisms789.8 188.2 446.9 99.8 668.3 154.0 347.2 114.4 
Cost of Removal740.4 197.5 448.1 21.1 666.6 157.9 420.9 16.2 
Deferred Portion of Non-Service Income
   Components of Pension, SERP and PBOP		409.3 58.8 202.8 41.1 354.0 49.9 175.9 36.6 
AFUDC - Transmission148.4 63.2 85.2 — 124.3 56.1 68.2 — 
Benefit Costs34.9 0.4 10.4 — 51.0 0.6 22.2 — 
Other Regulatory Liabilities212.3 41.6 14.0 4.9 201.9 30.4 13.9 4.6 
Total Regulatory Liabilities4,847.3 1,509.8 2,092.6 500.6 4,614.7 1,418.1 1,953.4 511.1 
Less:  Current Portion722.5 139.5 468.8 106.8 591.8 102.2 368.1 117.5 
Total Long-Term Regulatory Liabilities$4,124.8 $1,370.3 $1,623.8 $393.8 $4,022.9 $1,315.9 $1,585.3 $393.6