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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of AFUDC and Weighted Average AFUDC (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Components of Other Operating Costs and Expense [Line Items]      
Borrowed Funds $ 64.4 $ 44.6 $ 21.8
Equity Funds 97.8 78.1 47.3
Total AFUDC $ 162.2 $ 122.7 $ 69.1
Average AFUDC Rate (in percent) 6.50% 5.80% 4.70%
CL&P      
Components of Other Operating Costs and Expense [Line Items]      
Borrowed Funds $ 8.1 $ 7.7 $ 4.8
Equity Funds 22.4 20.0 13.6
Total AFUDC $ 30.5 $ 27.7 $ 18.4
Average AFUDC Rate (in percent) 6.70% 6.70% 6.60%
NSTAR Electric      
Components of Other Operating Costs and Expense [Line Items]      
Borrowed Funds $ 27.2 $ 17.2 $ 10.7
Equity Funds 58.8 45.7 24.6
Total AFUDC $ 86.0 $ 62.9 $ 35.3
Average AFUDC Rate (in percent) 7.00% 5.90% 5.40%
PSNH      
Components of Other Operating Costs and Expense [Line Items]      
Borrowed Funds $ 8.9 $ 6.1 $ 1.4
Equity Funds 7.0 5.4 2.5
Total AFUDC $ 15.9 $ 11.5 $ 3.9
Average AFUDC Rate (in percent) 5.50% 5.10% 2.60%