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REGULATORY ACCOUNTING (Tables)
 3 Months Ended
Mar. 31, 2023
Regulated Operations [Abstract]  
Components of Regulatory Assets The components of regulatory assets were as follows:
 As of March 31, 2023As of December 31, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Storm Costs, Net$1,658.7 $889.2 $564.9 $204.6 $1,379.1 $799.3 $484.4 $95.4 
Regulatory Tracking Mechanisms1,028.7 228.2 432.4 122.8 1,075.3 216.8 391.5 73.7 
Benefit Costs910.3 155.6 294.4 56.1 921.7 156.7 299.5 56.6 
Income Taxes, Net856.1 492.9 118.1 13.1 853.3 491.1 115.6 16.0 
Securitized Stranded Costs424.9 — — 424.9 435.7 — — 435.7 
Goodwill-related276.7 — 237.6 — 281.0 — 241.2 — 
Derivative Liabilities168.8 168.8 — — 181.8 181.8 — — 
Asset Retirement Obligations129.2 36.5 68.0 4.5 127.9 35.9 68.2 4.4 
Other Regulatory Assets286.5 25.3 107.9 12.5 322.5 26.2 114.0 14.4 
Total Regulatory Assets5,739.9 1,996.5 1,823.3 838.5 5,578.3 1,907.8 1,714.4 696.2 
Less:  Current Portion1,332.0 356.5 559.8 140.9 1,335.5 314.1 492.8 102.2 
Total Long-Term Regulatory Assets$4,407.9 $1,640.0 $1,263.5 $697.6 $4,242.8 $1,593.7 $1,221.6 $594.0 
Components of Regulatory Liabilities The components of regulatory liabilities were as follows:
 As of March 31, 2023As of December 31, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017$2,601.8 $980.0 $933.9 $346.1 $2,619.3 $983.6 $944.3 $348.6 
Cost of Removal705.4 144.2 412.9 20.2 670.6 130.8 405.3 14.7 
Regulatory Tracking Mechanisms653.6 145.0 341.6 73.2 890.8 361.0 336.1 155.0 
Deferred Portion of Non-Service Income
   Components of Pension, SERP and PBOP		291.4 38.3 148.5 30.8 270.9 34.5 139.7 28.8 
AFUDC - Transmission103.8 49.8 54.0 — 98.2 48.2 50.0 — 
Benefit Costs49.2 0.6 27.1 — 55.4 0.7 31.4 — 
Other Regulatory Liabilities219.7 44.0 14.6 6.6 215.9 40.6 14.5 6.5 
Total Regulatory Liabilities4,624.9 1,401.9 1,932.6 476.9 4,821.1 1,599.4 1,921.3 553.6 
Less:  Current Portion650.5 124.6 375.0 86.6 890.8 336.0 373.2 162.0 
Total Long-Term Regulatory Liabilities$3,974.4 $1,277.3 $1,557.6 $390.3 $3,930.3 $1,263.4 $1,548.1 $391.6