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REGULATORY ACCOUNTING (Tables)
 3 Months Ended
Mar. 31, 2022
Regulated Operations [Abstract]  
Components of Regulatory Assets The components of regulatory assets were as follows:
 As of March 31, 2022As of December 31, 2021
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Benefit Costs$1,452.5 $268.0 $386.9 $116.5 $1,481.0 $272.4 $395.5 $118.9 
Storm Costs, Net1,249.3 735.7 449.4 64.2 1,102.7 695.6 341.3 65.8 
Regulatory Tracking Mechanisms937.7 295.2 375.0 97.0 1,050.5 333.6 376.6 85.4 
Income Taxes, Net791.2 471.8 112.8 14.5 790.7 470.5 112.6 17.5 
Securitized Stranded Costs468.1 — — 468.1 478.9 — — 478.9 
Goodwill-related293.6 — 252.1 — 297.8 — 255.7 — 
Derivative Liabilities229.4 229.4 — — 249.2 249.2 — — 
Asset Retirement Obligations117.5 34.2 61.9 4.2 115.0 33.6 59.8 4.1 
Other Regulatory Assets162.1 28.9 35.4 14.7 150.0 29.9 37.7 15.8 
Total Regulatory Assets5,701.4 2,063.2 1,673.5 779.2 5,715.8 2,084.8 1,579.2 786.4 
Less:  Current Portion1,128.1 382.1 433.7 124.7 1,129.1 371.6 444.0 107.2 
Total Long-Term Regulatory Assets$4,573.3 $1,681.1 $1,239.8 $654.5 $4,586.7 $1,713.2 $1,135.2 $679.2 
Components of Regulatory Liabilities The components of regulatory liabilities were as follows:
 As of March 31, 2022As of December 31, 2021
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017$2,665.7 $992.7 $973.3 $356.1 $2,685.2 $996.1 $984.5 $359.2 
Cost of Removal667.2 108.6 388.2 19.1 649.6 100.1 381.0 17.2 
Regulatory Tracking Mechanisms571.8 226.7 237.2 94.9 448.4 182.0 185.1 107.0 
Benefit Costs128.3 — 103.1 — 133.5 — 107.4 — 
AFUDC - Transmission85.1 44.0 41.1 — 81.0 43.2 37.8 — 
CL&P Settlement Agreement and Storm
  Performance Penalty		12.9 12.9 — — 81.3 81.3 — — 
Other Regulatory Liabilities416.2 75.0 107.4 25.1 389.7 57.1 91.5 18.2 
Total Regulatory Liabilities4,547.2 1,459.9 1,850.3 495.2 4,468.7 1,459.8 1,787.3 501.6 
Less:  Current Portion652.4 251.6 279.3 106.4 602.4 266.5 228.2 120.2 
Total Long-Term Regulatory Liabilities$3,894.8 $1,208.3 $1,571.0 $388.8 $3,866.3 $1,193.3 $1,559.1 $381.4