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LEASES - Other Information Related to Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Weighted-Average Remaining Lease Term (Years):      
Operating Leases 9 years 9 years  
Finance Leases 12 years 13 years  
Weighted-Average Discount Rate (Percentage):      
Operating Leases 4.10% 4.00%  
Finance Leases 3.30% 3.30%  
Cash Paid for Amounts Included in the Measurement of Lease Liabilities:      
Operating Cash Flows from Operating Leases $ 14.5 $ 10.5 $ 11.3
Operating Cash Flows from Finance Leases 2.6 2.0 2.0
Financing Cash Flows from Finance Leases 5.2 3.9 3.9
Supplemental Non-Cash Information on Lease Liabilities:      
Right-of-use-Assets Obtained in Exchange for New Operating Lease Liabilities 15.3 12.8 18.9
Right-of-use-Assets Obtained in Exchange for New Finance Lease Liabilities $ 0.3 $ 18.5 3.5
CL&P      
Weighted-Average Remaining Lease Term (Years):      
Operating Leases 4 years 4 years  
Finance Leases 8 years 9 years  
Weighted-Average Discount Rate (Percentage):      
Operating Leases 5.20% 5.20%  
Finance Leases 5.30% 5.30%  
Cash Paid for Amounts Included in the Measurement of Lease Liabilities:      
Operating Cash Flows from Operating Leases $ 2.5 $ 0.7 0.3
Operating Cash Flows from Finance Leases 0.7 0.0 0.0
Financing Cash Flows from Finance Leases 1.2 0.0 0.0
Supplemental Non-Cash Information on Lease Liabilities:      
Right-of-use-Assets Obtained in Exchange for New Operating Lease Liabilities 7.8 0.6 2.4
Right-of-use-Assets Obtained in Exchange for New Finance Lease Liabilities $ 0.0 $ 18.3 0.0
NSTAR Electric      
Weighted-Average Remaining Lease Term (Years):      
Operating Leases 12 years 13 years  
Finance Leases 17 years 18 years  
Weighted-Average Discount Rate (Percentage):      
Operating Leases 4.20% 4.20%  
Finance Leases 2.90% 2.90%  
Cash Paid for Amounts Included in the Measurement of Lease Liabilities:      
Operating Cash Flows from Operating Leases $ 4.9 $ 2.5 2.1
Operating Cash Flows from Finance Leases 0.7 0.6 0.6
Financing Cash Flows from Finance Leases 0.0 0.0 0.0
Supplemental Non-Cash Information on Lease Liabilities:      
Right-of-use-Assets Obtained in Exchange for New Operating Lease Liabilities 5.7 7.0 0.0
Right-of-use-Assets Obtained in Exchange for New Finance Lease Liabilities $ 0.0 $ 0.0 0.0
PSNH      
Weighted-Average Remaining Lease Term (Years):      
Operating Leases 2 years 3 years  
Weighted-Average Discount Rate (Percentage):      
Operating Leases 5.20% 5.20%  
Finance Leases 0.00% 0.00%  
Cash Paid for Amounts Included in the Measurement of Lease Liabilities:      
Operating Cash Flows from Operating Leases $ 1.8 $ 0.4 0.1
Operating Cash Flows from Finance Leases 0.0 0.0 0.0
Financing Cash Flows from Finance Leases 0.0 0.0 0.1
Supplemental Non-Cash Information on Lease Liabilities:      
Right-of-use-Assets Obtained in Exchange for New Operating Lease Liabilities 0.3 5.0 0.0
Right-of-use-Assets Obtained in Exchange for New Finance Lease Liabilities $ 0.0 $ 0.0 $ 0.0