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SHORT-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Borrowings Outstanding | The amount of borrowings outstanding and available under the commercial paper programs were as follows:
| Borrowings Outstanding as of December 31, |  | Available Borrowing Capacity as of December 31, |  | Weighted-Average Interest Rate as of December 31,
(Millions of Dollars) | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Eversource Parent Commercial Paper Program | $ | 1,538.0 |  |  | $ | 1,771.9 |  |  | $ | 462.0 |  |  | $ | 228.1 |  |  | 4.76 | % |  | 5.60 | %
NSTAR Electric Commercial Paper Program | 504.8 |  |  | 365.8 |  |  | 145.2 |  |  | 284.2 |  |  | 4.55 | % |  | 5.40 | %
Details of long-term debt outstanding are as follows:
CL&P (Millions of Dollars) |  |  | As of December 31,
Interest Rate |  | 2024 |  | 2023
First Mortgage Bonds: |  |  |  |  |
1994 Series D due 2024 | 7.875 | % |  | $ | — |  |  | $ | 139.8 |
2004 Series B due 2034 | 5.750 | % |  | 130.0 |  |  | 130.0 |
2005 Series B due 2035 | 5.625 | % |  | 100.0 |  |  | 100.0 |
2006 Series A due 2036 | 6.350 | % |  | 250.0 |  |  | 250.0 |
2007 Series B due 2037 | 5.750 | % |  | 150.0 |  |  | 150.0 |
2007 Series D due 2037 | 6.375 | % |  | 100.0 |  |  | 100.0 |
2014 Series A due 2044 | 4.300 | % |  | 475.0 |  |  | 475.0 |
2015 Series A due 2045 | 4.150 | % |  | 350.0 |  |  | 350.0 |
2017 Series A due 2027 | 3.200 | % |  | 500.0 |  |  | 500.0 |
2018 Series A due 2048 | 4.000 | % |  | 800.0 |  |  | 800.0 |
2020 Series A due 2025 | 0.750 | % |  | 400.0 |  |  | 400.0 |
2021 Series A due 2031 | 2.050 | % |  | 425.0 |  |  | 425.0 |
2023 Series A due 2053 | 5.250 | % |  | 500.0 |  |  | 500.0 |
2023 Series B due 2033 | 4.900 | % |  | 300.0 |  |  | 300.0 |
2024 Series A due 2029 | 4.650 | % |  | 350.0 |  |  | — |
2024 Series B due 2034 | 4.950 | % |  | 300.0 |  |  | — |
Total First Mortgage Bonds |  |  | 5,130.0 |  |  | 4,619.8 |
Less Amounts due Within One Year |  |  | (400.0) |  |  | (139.8) |
Current Portion Classified as Long-Term Debt (1) |  |  | 397.1 |  |  | 139.8 |
Commercial Paper Classified as Long-Term Debt (See Note 8, Short-Term Debt) |  |  | — |  |  | 207.3 |
Unamortized Premiums and Discounts, Net |  |  | 14.3 |  |  | 18.0 |
Unamortized Debt Issuance Costs |  |  | (33.2) |  |  | (30.7) |
CL&P Long-Term Debt |  |  | $ | 5,108.2 |  |  | $ | 4,814.4 |
NSTAR Electric (Millions of Dollars) |  |  | As of December 31,
Interest Rate |  | 2024 |  | 2023
Debentures: |  |  |  |  |
2006 Debentures due 2036 | 5.750 | % |  | $ | 200.0 |  |  | $ | 200.0 |
2010 Debentures due 2040 | 5.500 | % |  | 300.0 |  |  | 300.0 |
2014 Debentures due 2044 | 4.400 | % |  | 300.0 |  |  | 300.0 |
2015 Debentures due 2025 | 3.250 | % |  | 250.0 |  |  | 250.0 |
2016 Debentures due 2026 | 2.700 | % |  | 250.0 |  |  | 250.0 |
2017 Debentures due 2027 | 3.200 | % |  | 700.0 |  |  | 700.0 |
2019 Debentures due 2029 | 3.250 | % |  | 400.0 |  |  | 400.0 |
2020 Debentures due 2030 | 3.950 | % |  | 400.0 |  |  | 400.0 |
2021 Debentures due 2051 | 3.100 | % |  | 300.0 |  |  | 300.0 |
2021 Debentures due 2031 | 1.950 | % |  | 300.0 |  |  | 300.0 |
2022 Debentures due 2052 | 4.550 | % |  | 450.0 |  |  | 450.0 |
2022 Debentures due 2052 | 4.950 | % |  | 400.0 |  |  | 400.0 |
2023 Debentures due 2028 | 5.600 | % |  | 150.0 |  |  | 150.0 |
2024 Debentures due 2034 | 5.400 | % |  | 600.0 |  |  | — |
Total Debentures |  |  | 5,000.0 |  |  | 4,400.0 |
Notes: |  |  |  |  |
2004 Senior Notes Series B due 2034 | 5.900 | % |  | 50.0 |  |  | 50.0 |
2007 Senior Notes Series D due 2037 | 6.700 | % |  | 40.0 |  |  | 40.0 |
2016 Senior Notes Series H due 2026 | 2.750 | % |  | 50.0 |  |  | 50.0 |
Total Notes |  |  | 140.0 |  |  | 140.0 |
Less Amounts due Within One Year |  |  | (250.0) |  |  | — |
Unamortized Premiums and Discounts, Net |  |  | (14.0) |  |  | (14.0) |
Unamortized Debt Issuance Costs |  |  | (31.1) |  |  | (29.1) |
NSTAR Electric Long-Term Debt |  |  | $ | 4,844.9 |  |  | $ | 4,496.9 |
PSNH (Millions of Dollars) |  |  | As of December 31,
Interest Rate |  | 2024 |  | 2023
First Mortgage Bonds: |  |  |  |  |
2005 Series M due 2035 | 5.600 | % |  | $ | 50.0 |  |  | $ | 50.0 |
2019 Series T due 2049 | 3.600 | % |  | 300.0 |  |  | 300.0 |
2020 Series U due 2050 | 2.400 | % |  | 150.0 |  |  | 150.0 |
2021 Series V due 2031 | 2.200 | % |  | 350.0 |  |  | 350.0 |
2023 Series W due 2053 | 5.150 | % |  | 300.0 |  |  | 300.0 |
2023 Series X due 2033 | 5.350 | % |  | 600.0 |  |  | 300.0 |
Total First Mortgage Bonds |  |  | 1,750.0 |  |  | 1,450.0 |
Unamortized Premiums and Discounts, Net |  |  | (2.6) |  |  | (4.9) |
Unamortized Debt Issuance Costs |  |  | (15.3) |  |  | (13.5) |
PSNH Long-Term Debt |  |  | $ | 1,732.1 |  |  | $ | 1,431.6 |
OTHER (Millions of Dollars) |  |  |  |  | As of December 31,
Interest Rate |  | 2024 |  | 2023
Eversource Parent - Senior Notes due 2025 - 2050 | 0.800 | % | - | 5.950% |  | $ | 11,350.0 |  |  | $ | 10,300.0 |
Yankee Gas - First Mortgage Bonds due 2025 - 2051 | 1.380 | % | - | 5.740% |  | 1,095.0 |  |  | 1,015.0 |
NSTAR Gas - First Mortgage Bonds due 2025 - 2051 | 2.250 | % | - | 7.110% |  | 905.0 |  |  | 705.0 |
EGMA - First Mortgage Bonds due 2028 - 2052 | 2.110 | % | - | 5.730% |  | 808.0 |  |  | 708.0 |
Aquarion - Senior Notes due 2024 | 4.000% |  | — |  |  | 360.0 |
Aquarion - Unsecured Notes due 2028 - 2052 (2) | 3.000 | % | - | 6.430% |  | 596.8 |  |  | 527.0 |
Aquarion - Secured Debt due 2027 - 2045 (2) | 1.296 | % | - | 9.290% |  | 40.7 |  |  | 39.0 |
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC) |  |  |  |  | 5.6 |  |  | 12.5 |
Fair Value Adjustment (3) |  |  |  |  | — |  |  | 19.3 |
Less Fair Value Adjustment - Current Portion (3) |  |  |  |  | — |  |  | (5.5) |
Less Amounts due in One Year |  |  |  |  | (750.3) |  |  | (1,810.2) |
Current Portion Classified as Long-Term Debt (1) |  |  |  |  | — |  |  | 990.9 |
Unamortized Premiums and Discounts, Net |  |  |  |  | 41.7 |  |  | 49.7 |
Unamortized Debt Issuance Costs |  |  |  |  | (76.1) |  |  | (65.0) |
Total Other Long-Term Debt |  |  |  |  | $ | 14,016.4 |  |  | $ | 12,845.7 |
Total Eversource Long-Term Debt |  |  |  |  | $ | 25,701.6 |  |  | $ | 23,588.6 |
(1) As a result of the CL&P long-term debt issuance in January 2025, $397.1 million of current portion of long-term debt was reclassified to Long-Term Debt on Eversource’s and CL&P’s balance sheets as of December 31, 2024. As a result of the CL&P and Eversource parent long-term debt issuances in January 2024, $139.8 million and $990.9 million, respectively, of current portion of long-term debt were reclassified to Long-Term Debt on CL&P’s and Eversource parent’s balance sheets as of December 31, 2023. (2) In January 2025, Eversource entered into an agreement to sell Aquarion. Upon close of the sale, Aquarion’s long-term debt will be repaid by Eversource and has therefore not been classified as held for sale. The sale is expected to close in late 2025. (3) The fair value adjustment amount is the purchase price adjustments, net of amortization, required to record long-term debt at fair value on the dates of the 2012 merger with NSTAR and the 2017 acquisition of Aquarion. As of December 31, 2024, the fair value adjustments were only related to the Aquarion acquisition and were reclassified to Liabilities Held for Sale.

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