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REGULATORY ACCOUNTING (Tables)
 6 Months Ended
Jun. 30, 2023
Regulated Operations [Abstract]  
Components of Regulatory Assets The components of regulatory assets were as follows:
 As of June 30, 2023As of December 31, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Storm Costs, Net$1,680.7 $875.2 $552.9 $252.6 $1,379.1 $799.3 $484.4 $95.4 
Regulatory Tracking Mechanisms1,075.7 286.6 438.3 136.9 1,075.3 216.8 391.5 73.7 
Benefit Costs873.9 144.1 282.2 52.3 921.7 156.7 299.5 56.6 
Income Taxes, Net864.7 499.8 121.7 12.7 853.3 491.1 115.6 16.0 
Securitized Stranded Costs414.1 — — 414.1 435.7 — — 435.7 
Goodwill-related272.5 — 234.0 — 281.0 — 241.2 — 
Derivative Liabilities152.1 152.1 — — 181.8 181.8 — — 
Asset Retirement Obligations132.1 37.1 69.4 4.5 127.9 35.9 68.2 4.4 
Other Regulatory Assets307.2 24.4 101.7 10.5 322.5 26.2 114.0 14.4 
Total Regulatory Assets5,773.0 2,019.3 1,800.2 883.6 5,578.3 1,907.8 1,714.4 696.2 
Less:  Current Portion1,382.2 417.8 569.7 152.0 1,335.5 314.1 492.8 102.2 
Total Long-Term Regulatory Assets$4,390.8 $1,601.5 $1,230.5 $731.6 $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 June 30, 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$2,584.1 $976.5 $923.6 $343.7 $2,619.3 $983.6 $944.3 $348.6 
Cost of Removal660.9 147.1 412.8 19.3 670.6 130.8 405.3 14.7 
Regulatory Tracking Mechanisms683.7 215.4 290.7 77.4 890.8 361.0 336.1 155.0 
Deferred Portion of Non-Service Income
   Components of Pension, SERP and PBOP		312.7 42.3 157.8 32.7 270.9 34.5 139.7 28.8 
AFUDC - Transmission110.2 51.5 58.7 — 98.2 48.2 50.0 — 
Benefit Costs50.1 0.6 25.7 — 55.4 0.7 31.4 — 
Other Regulatory Liabilities219.5 44.2 14.5 5.8 215.9 40.6 14.5 6.5 
Total Regulatory Liabilities4,621.2 1,477.6 1,883.8 478.9 4,821.1 1,599.4 1,921.3 553.6 
Less:  Current Portion653.8 185.3 321.2 83.2 890.8 336.0 373.2 162.0 
Total Long-Term Regulatory Liabilities$3,967.4 $1,292.3 $1,562.6 $395.7 $3,930.3 $1,263.4 $1,548.1 $391.6