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LONG-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Schedule of Outstanding Long-Term Debt | 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) | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
Eversource Parent Commercial Paper Program | $ | 1,771.9 |  |  | $ | 1,442.2 |  |  | $ | 228.1 |  |  | $ | 557.8 |  |  | 5.60 | % |  | 4.63 | %
NSTAR Electric Commercial Paper Program | 365.8 |  |  | — |  |  | 284.2 |  |  | 650.0 |  |  | 5.40 | % |  | — | %
Details of long-term debt outstanding are as follows:
CL&P (Millions of Dollars) |  |  | As of December 31,
Interest Rate |  | 2023 |  | 2022
First Mortgage Bonds: |  |  |  |  |
1994 Series D due 2024 | 7.875 | % |  | $ | 139.8 |  |  | $ | 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 |
2013 Series A due 2023 | 2.500 | % |  | — |  |  | 400.0 |
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 |  |  | — |
2023 Series B due 2033 | 4.900 | % |  | 300.0 |  |  | — |
Total First Mortgage Bonds |  |  | 4,619.8 |  |  | 4,219.8 |
Less Amounts due Within One Year |  |  | (139.8) |  |  | (400.0) |
Current Portion Classified as Long-Term Debt (1) |  |  | 139.8 |  |  | 400.0 |
Commercial Paper Classified as Long-Term Debt (See Note 8, Short-Term Debt) |  |  | 207.3 |  |  | — |
Unamortized Premiums and Discounts, Net |  |  | 18.0 |  |  | 21.5 |
Unamortized Debt Issuance Costs |  |  | (30.7) |  |  | (24.8) |
CL&P Long-Term Debt |  |  | $ | 4,814.4 |  |  | $ | 4,216.5 |
NSTAR Electric (Millions of Dollars) |  |  | As of December 31,
Interest Rate |  | 2023 |  | 2022
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 |  |  | — |
Total Debentures |  |  | 4,400.0 |  |  | 4,250.0 |
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 |
2013 Senior Notes Series G due 2023 | 3.880 | % |  | — |  |  | 80.0 |
2016 Senior Notes Series H due 2026 | 2.750 | % |  | 50.0 |  |  | 50.0 |
Total Notes |  |  | 140.0 |  |  | 220.0 |
Less Amounts due Within One Year |  |  | — |  |  | (80.0) |
Unamortized Premiums and Discounts, Net |  |  | (14.0) |  |  | (14.8) |
Unamortized Debt Issuance Costs |  |  | (29.1) |  |  | (30.1) |
NSTAR Electric Long-Term Debt |  |  | $ | 4,496.9 |  |  | $ | 4,345.1 |
PSNH (Millions of Dollars) |  |  | As of December 31,
Interest Rate |  | 2023 |  | 2022
First Mortgage Bonds: |  |  |  |  |
2005 Series M due 2035 | 5.600 | % |  | $ | 50.0 |  |  | $ | 50.0 |
2013 Series S due 2023 | 3.500 | % |  | — |  |  | 325.0 |
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 |  |  | — |
2023 Series X due 2033 | 5.350 | % |  | 300.0 |  |  | — |
Total First Mortgage Bonds |  |  | 1,450.0 |  |  | 1,175.0 |
Less Amounts due Within One Year |  |  | — |  |  | (325.0) |
Current Portion Classified as Long-Term Debt (1) |  |  | — |  |  | 295.3 |
Unamortized Premiums and Discounts, Net |  |  | (4.9) |  |  | (2.5) |
Unamortized Debt Issuance Costs |  |  | (13.5) |  |  | (7.9) |
PSNH Long-Term Debt |  |  | $ | 1,431.6 |  |  | $ | 1,134.9 |
OTHER (Millions of Dollars) |  |  |  |  | As of December 31,
Interest Rate |  | 2023 |  | 2022
Eversource Parent - Senior Notes due 2024 - 2050 | 0.800 | % | - | 5.950% |  | $ | 10,300.0 |  |  | $ | 8,150.0 |
Yankee Gas - First Mortgage Bonds due 2024 - 2051 | 1.380 | % | - | 5.510% |  | 1,015.0 |  |  | 845.0 |
NSTAR Gas - First Mortgage Bonds due 2025 - 2051 | 2.250 | % | - | 7.110% |  | 705.0 |  |  | 705.0 |
EGMA - First Mortgage Bonds due 2028 - 2052 | 2.110 | % | - | 5.730% |  | 708.0 |  |  | 650.0 |
Aquarion - Senior Notes due 2024 | 4.000% |  | 360.0 |  |  | 360.0 |
Aquarion - Unsecured Notes due 2028 - 2052 | 3.000 | % | - | 6.430% |  | 527.0 |  |  | 464.7 |
Aquarion - Secured Debt due 2027 - 2044 | 1.550 | % | - | 9.290% |  | 39.0 |  |  | 34.4 |
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC) |  |  |  |  | 12.5 |  |  | 11.9 |
Fair Value Adjustment (2) |  |  |  |  | 19.3 |  |  | 26.2 |
Less Fair Value Adjustment - Current Portion (2) |  |  |  |  | (5.5) |  |  | (7.0) |
Less Amounts due in One Year |  |  |  |  | (1,810.2) |  |  | (1,203.4) |
Current Portion Classified as Long-Term Debt (1) |  |  |  |  | 990.9 |  |  | — |
Unamortized Premiums and Discounts, Net |  |  |  |  | 49.7 |  |  | 40.1 |
Unamortized Debt Issuance Costs |  |  |  |  | (65.0) |  |  | (49.4) |
Total Other Long-Term Debt |  |  |  |  | $ | 12,845.7 |  |  | $ | 10,027.5 |
Total Eversource Long-Term Debt |  |  |  |  | $ | 23,588.6 |  |  | $ | 19,724.0 |
(1) 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 as Long-Term Debt on CL&P’s and Eversource parent’s balance sheets as of December 31, 2023. As a result of the CL&P and PSNH long-term debt issuances in January 2023, $400 million and $295.3 million, respectively, of current portion of long-term debt were reclassified as Long-Term Debt on CL&P’s and PSNH’s balance sheets as of December 31, 2022. (2) 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.
Schedule of Issuance and Repayments of Long-Term Debt | The following table summarizes long-term debt issuances and repayments:
(Millions of Dollars) | Interest Rate |  | Issuance/ (Repayment) |  | Issue Date or Repayment Date |  | Maturity Date |  | Use of Proceeds for Issuance/ Repayment Information
CL&P 2023 Series A First Mortgage Bonds | 5.25 | % |  | $ | 500.0 |  |  | January 2023 |  | January 2053 |  | Repaid 2013 Series A Bonds at maturity and short-term debt, and paid capital expenditures and working capital
CL&P 2013 Series A First Mortgage Bonds | 2.50 | % |  | (400.0) |  |  | January 2023 |  | January 2023 |  | Paid at maturity
CL&P 2023 Series B First Mortgage Bonds | 4.90 | % |  | 300.0 |  |  | July 2023 |  | July 2033 |  | Repaid short-term debt, paid capital expenditures and working capital
CL&P 2024 Series A First Mortgage Bonds | 4.65 | % |  | 350.0 |  |  | January 2024 |  | January 2029 |  | Repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric 2023 Debentures | 5.60 | % |  | 150.0 |  |  | September 2023 |  | October 2028 |  | Repaid Series G Senior Notes at maturity and short-term debt and for general corporate purposes
NSTAR Electric 2013 Series G Senior Notes | 3.88 | % |  | (80.0) |  |  | November 2023 |  | November 2023 |  | Paid at maturity
PSNH Series W First Mortgage Bonds | 5.15 | % |  | 300.0 |  |  | January 2023 |  | January 2053 |  | Repaid short-term debt, paid capital expenditures and working capital
PSNH Series X First Mortgage Bonds | 5.35 | % |  | 300.0 |  |  | September 2023 |  | October 2033 |  | Repaid Series S Bonds at maturity and for general corporate purposes
PSNH Series S First Mortgage Bonds | 3.50 | % |  | (325.0) |  |  | November 2023 |  | November 2023 |  | Paid at maturity
Eversource Parent Series Z Senior Notes | 5.45 | % |  | 750.0 |  |  | March 2023 |  | March 2028 |  | Repaid Series F Senior Notes at maturity and short-term debt
Eversource Parent Series F Senior Notes | 2.80 | % |  | (450.0) |  |  | May 2023 |  | May 2023 |  | Paid at maturity
Eversource Parent Series Z Senior Notes | 5.45 | % |  | 550.0 |  |  | May 2023 |  | March 2028 |  | Repaid Series T Senior Notes and Series N Senior Notes at maturity and short-term debt
Eversource Parent Series AA Senior Notes | 4.75 | % |  | 450.0 |  |  | May 2023 |  | May 2026 |  | Repaid Series T Senior Notes and Series N Senior Notes at maturity and short-term debt
Eversource Parent Series BB Senior Notes | 5.125 | % |  | 800.0 |  |  | May 2023 |  | May 2033 |  | Repaid Series T Senior Notes and Series N Senior Notes at maturity and short-term debt
Eversource Parent Variable Rate Series T Senior Notes | SOFR plus 0.25% |  | (350.0) |  |  | August 2023 |  | August 2023 |  | Paid at maturity
Eversource Parent Series CC Senior Notes | 5.95 | % |  | 800.0 |  |  | November 2023 |  | February 2029 |  | Repaid Series N Senior Notes at maturity and short-term debt
Eversource Parent Series N Senior Notes | 3.80 | % |  | (400.0) |  |  | December 2023 |  | December 2023 |  | Paid at maturity
Eversource Parent Series DD Senior Notes | 5.00 | % |  | 350.0 |  |  | January 2024 |  | January 2027 |  | Repaid short-term debt
Eversource Parent Series EE Senior Notes | 5.50 | % |  | 650.0 |  |  | January 2024 |  | January 2034 |  | Repaid short-term debt
Yankee Gas Series V First Mortgage Bonds | 5.51 | % |  | 170.0 |  |  | August 2023 |  | August 2030 |  | Repaid short-term debt and general corporate purposes
EGMA Series D First Mortgage Bonds | 5.73 | % |  | 58.0 |  |  | November 2023 |  | November 2028 |  | Repaid short-term debt, paid capital expenditures and working capital
Aquarion Water Company of Connecticut Senior Notes | 5.89 | % |  | 50.0 |  |  | September 2023 |  | October 2043 |  | Repaid existing indebtedness, paid capital expenditures and general corporate purposes
Schedule of Maturities of Long-Term Debt Outstanding | Long-term debt maturities on debt outstanding for the years 2024 through 2028 and thereafter are shown below. These amounts exclude PSNH rate reduction bonds, CYAPC pre-1983 spent nuclear fuel obligation, net unamortized premiums, discounts and debt issuance costs, and other fair value adjustments as of December 31, 2023:
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
2024 | $ | 1,950.0 |  |  | $ | 139.8 |  |  | $ | — |  |  | $ | — |
2025 | 1,400.2 |  |  | 400.0 |  |  | 250.0 |  |  | — |
2026 | 1,390.2 |  |  | — |  |  | 300.0 |  |  | — |
2027 | 2,539.2 |  |  | 500.0 |  |  | 700.0 |  |  | — |
2028 | 1,978.5 |  |  | — |  |  | 150.0 |  |  | — |
Thereafter | 15,005.7 |  |  | 3,580.0 |  |  | 3,140.0 |  |  | 1,450.0 |
Total | $ | 24,263.8 |  |  | $ | 4,619.8 |  |  | $ | 4,540.0 |  |  | $ | 1,450.0 |

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