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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

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