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LONG-TERM DEBT
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
LONG-TERM DEBT LONG-TERM DEBT
Details of long-term debt outstanding are as follows:
CL&P
(Millions of Dollars)
As of December 31,
Interest Rate20232022
First Mortgage Bonds:  
1994 Series D due 20247.875 %$139.8 $139.8 
2004 Series B due 20345.750 %130.0 130.0 
2005 Series B due 20355.625 %100.0 100.0 
2006 Series A due 20366.350 %250.0 250.0 
2007 Series B due 20375.750 %150.0 150.0 
2007 Series D due 20376.375 %100.0 100.0 
2013 Series A due 20232.500 %— 400.0 
2014 Series A due 2044  4.300 %475.0 475.0 
2015 Series A due 20454.150 %350.0 350.0 
   2017 Series A due 20273.200 %500.0 500.0 
2018 Series A due 20484.000 %800.0 800.0 
2020 Series A due 20250.750 %400.0 400.0 
2021 Series A due 20312.050 %425.0 425.0 
2023 Series A due 20535.250 %500.0 — 
2023 Series B due 20334.900 %300.0 — 
Total First Mortgage Bonds4,619.8 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, Net18.0 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 Rate20232022
Debentures:  
2006 Debentures due 20365.750 %$200.0 $200.0 
2010 Debentures due 20405.500 %300.0 300.0 
2014 Debentures due 2044  4.400 %300.0 300.0 
2015 Debentures due 20253.250 %250.0 250.0 
2016 Debentures due 20262.700 %250.0 250.0 
2017 Debentures due 20273.200 %700.0 700.0 
2019 Debentures due 20293.250 %400.0 400.0 
2020 Debentures due 20303.950 %400.0 400.0 
2021 Debentures due 20513.100 %300.0 300.0 
2021 Debentures due 20311.950 %300.0 300.0 
2022 Debentures due 20524.550 %450.0 450.0 
2022 Debentures due 20524.950 %400.0 400.0 
2023 Debentures due 20285.600 %150.0 — 
Total Debentures4,400.0 4,250.0 
Notes:  
2004 Senior Notes Series B due 20345.900 %50.0 50.0 
2007 Senior Notes Series D due 20376.700 %40.0 40.0 
2013 Senior Notes Series G due 20233.880 %— 80.0 
2016 Senior Notes Series H due 20262.750 %50.0 50.0 
Total Notes140.0 220.0 
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 Rate20232022
First Mortgage Bonds:  
2005 Series M due 20355.600 %$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 20502.400 %150.0 150.0 
2021 Series V due 20312.200 %350.0 350.0 
2023 Series W due 20535.150 %300.0 — 
2023 Series X due 20335.350 %300.0 — 
Total First Mortgage Bonds1,450.0 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 Rate20232022
Eversource Parent - Senior Notes due 2024 - 20500.800 %-5.950%$10,300.0 $8,150.0 
Yankee Gas - First Mortgage Bonds due 2024 - 20511.380 %-5.510%1,015.0 845.0 
NSTAR Gas - First Mortgage Bonds due 2025 - 20512.250 %-7.110%705.0 705.0 
EGMA - First Mortgage Bonds due 2028 - 20522.110 %-5.730%708.0 650.0 
Aquarion - Senior Notes due 20244.000%360.0 360.0 
Aquarion - Unsecured Notes due 2028 - 20523.000 %-6.430%527.0 464.7 
Aquarion - Secured Debt due 2027 - 20441.550 %-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.

Availability under Long-Term Debt Issuance Authorizations: On June 14, 2022, the DPU approved NSTAR Gas’ request for authorization to issue up to $325 million in long-term debt through December 31, 2024. On November 30, 2022, the PURA approved CL&P's request for authorization to issue up to $1.15 billion in long-term debt through December 31, 2024. As a result of CL&P’s January 2024 long-term debt issuance, CL&P has now fully utilized this authorization. On June 7, 2023, PURA approved Yankee Gas’ request for authorization to issue up to $350 million in long-term debt through December 31, 2024. On November 21, 2023, NSTAR Electric petitioned the DPU requesting authorization to issue up to $2.4 billion in long-term debt through December 31, 2026. On February 8, 2024, the NHPUC approved PSNH’s request for authorization to issue up to $300 million in long-term debt through December 31, 2024.
Long-Term Debt Issuances and Repayments: The following table summarizes long-term debt issuances and repayments:
(Millions of Dollars)Interest RateIssuance/
(Repayment)		Issue Date or Repayment DateMaturity DateUse of Proceeds for Issuance/
Repayment Information
CL&P 2023 Series A First Mortgage Bonds 5.25 %$500.0 January 2023January 2053Repaid 2013 Series A Bonds at maturity and short-term debt, and paid capital expenditures and working capital
CL&P 2013 Series A First Mortgage Bonds2.50 %(400.0)January 2023January 2023Paid at maturity
CL&P 2023 Series B First Mortgage Bonds4.90 %300.0 July 2023July 2033Repaid short-term debt, paid capital expenditures and working capital
CL&P 2024 Series A First Mortgage Bonds4.65 %350.0 January 2024January 2029Repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric 2023 Debentures5.60 %150.0 September 2023October 2028Repaid Series G Senior Notes at maturity and short-term debt and for general corporate purposes
NSTAR Electric 2013 Series G Senior Notes3.88 %(80.0)November 2023November 2023Paid at maturity
PSNH Series W First Mortgage Bonds5.15 %300.0 January 2023January 2053Repaid short-term debt, paid capital expenditures and working capital
PSNH Series X First Mortgage Bonds5.35 %300.0 September 2023October 2033Repaid Series S Bonds at maturity and for general corporate purposes
PSNH Series S First Mortgage Bonds3.50 %(325.0)November 2023November 2023Paid at maturity
Eversource Parent Series Z Senior Notes5.45 %750.0 March 2023March 2028Repaid Series F Senior Notes at maturity and short-term debt
Eversource Parent Series F Senior Notes2.80 %(450.0)May 2023May 2023Paid at maturity
Eversource Parent Series Z Senior Notes5.45 %550.0 May 2023March 2028Repaid Series T Senior Notes and Series N Senior Notes at maturity and short-term debt
Eversource Parent Series AA Senior Notes4.75 %450.0 May 2023May 2026Repaid Series T Senior Notes and Series N Senior Notes at maturity and short-term debt
Eversource Parent Series BB Senior Notes5.125 %800.0 May 2023May 2033Repaid 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 2023August 2023Paid at maturity
Eversource Parent Series CC Senior Notes5.95 %800.0 November 2023February 2029Repaid Series N Senior Notes at maturity and short-term debt
Eversource Parent Series N Senior Notes3.80 %(400.0)December 2023December 2023Paid at maturity
Eversource Parent Series DD Senior Notes5.00 %350.0 January 2024January 2027Repaid short-term debt
Eversource Parent Series EE Senior Notes5.50 %650.0 January 2024January 2034Repaid short-term debt
Yankee Gas Series V First Mortgage Bonds5.51 %170.0 August 2023August 2030Repaid short-term debt and general corporate purposes
EGMA Series D First Mortgage Bonds5.73 %58.0 November 2023November 2028Repaid short-term debt, paid capital expenditures and working capital
Aquarion Water Company of Connecticut Senior Notes5.89 %50.0 September 2023October 2043Repaid existing indebtedness, paid capital expenditures and general corporate purposes

Long-Term Debt Provisions:  The utility plant of CL&P, PSNH, Yankee Gas, NSTAR Gas, EGMA and a portion of Aquarion is subject to the lien of each company's respective first mortgage bond indenture.  The Eversource parent, NSTAR Electric and a portion of Aquarion debt is unsecured. Additionally, the long-term debt agreements provide that Eversource and certain of its subsidiaries must comply with certain covenants as are customarily included in such agreements, including equity requirements for NSTAR Electric, NSTAR Gas and Aquarion.  Under the equity requirements, NSTAR Electric's and Aquarion's senior notes must maintain a certain consolidated indebtedness to capitalization ratio as of the end of any fiscal quarter and NSTAR Gas' outstanding long-term debt must not exceed equity.

Certain secured and unsecured long-term debt securities are callable at redemption price or are subject to make-whole provisions.

No long-term debt defaults have occurred as of December 31, 2023.

CYAPC's Pre-1983 Spent Nuclear Fuel Obligation:  Under the Nuclear Waste Policy Act of 1982, the DOE is responsible for the selection and development of repositories for, and the disposal of, spent nuclear fuel and high-level radioactive waste. CYAPC is obligated to pay the DOE for the costs to dispose of spent nuclear fuel and high-level radioactive waste generated prior to April 7, 1983 (pre-1983 Spent Nuclear Fuel). CYAPC has partially paid this obligation and recorded an accrual for its remaining liability to the DOE. This liability accrues interest costs at the 3-month Treasury bill yield rate. For nuclear fuel used to generate electricity prior to April 7, 1983, payment may be made any time prior to the first delivery of spent fuel to the DOE. As of December 31, 2023 and 2022, as a result of consolidating CYAPC, Eversource has consolidated $12.5 million and $11.9 million, respectively, in pre-1983 spent nuclear fuel obligations to the DOE. The obligation includes accumulated interest costs of $9.5 million and $8.8 million as of December 31, 2023 and 2022, respectively.  CYAPC maintains a trust to fund amounts due to the DOE for the disposal of pre-1983 spent nuclear fuel.  For further information, see Note 5, "Marketable Securities," to the financial statements. Fees for disposal of nuclear fuel burned on or after April 7, 1983 were billed to member companies and paid to the DOE.
Long-Term Debt Maturities:  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)EversourceCL&PNSTAR ElectricPSNH
2024$1,950.0 $139.8 $— $— 
20251,400.2 400.0 250.0 — 
20261,390.2 — 300.0 — 
20272,539.2 500.0 700.0 — 
20281,978.5 — 150.0 — 
Thereafter15,005.7 3,580.0 3,140.0 1,450.0 
Total$24,263.8 $4,619.8 $4,540.0 $1,450.0