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LONG-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2024
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)202420232024202320242023
Eversource Parent Commercial Paper Program $1,538.0 $1,771.9 $462.0 $228.1 4.76 %5.60 %
NSTAR Electric Commercial Paper Program 504.8 365.8 145.2 284.2 4.55 %5.40 %
Details of long-term debt outstanding are as follows:
CL&P
(Millions of Dollars)
As of December 31,
Interest Rate20242023
First Mortgage Bonds:  
1994 Series D due 20247.875 %$— $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 
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 %500.0 500.0 
2023 Series B due 20334.900 %300.0 300.0 
2024 Series A due 20294.650 %350.0 — 
2024 Series B due 20344.950 %300.0 — 
Total First Mortgage Bonds5,130.0 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, Net14.3 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 Rate20242023
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 %150.0 150.0 
2024 Debentures due 20345.400 %600.0 — 
Total Debentures5,000.0 4,400.0 
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 
2016 Senior Notes Series H due 20262.750 %50.0 50.0 
Total Notes140.0 140.0 
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 Rate20242023
First Mortgage Bonds:  
2005 Series M due 20355.600 %$50.0 $50.0 
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 %300.0 300.0 
2023 Series X due 20335.350 %600.0 300.0 
Total First Mortgage Bonds1,750.0 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 Rate20242023
Eversource Parent - Senior Notes due 2025 - 20500.800 %-5.950%$11,350.0 $10,300.0 
Yankee Gas - First Mortgage Bonds due 2025 - 20511.380 %-5.740%1,095.0 1,015.0 
NSTAR Gas - First Mortgage Bonds due 2025 - 20512.250 %-7.110%905.0 705.0 
EGMA - First Mortgage Bonds due 2028 - 20522.110 %-5.730%808.0 708.0 
Aquarion - Senior Notes due 20244.000%— 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.
Schedule of Issuance and Repayments of Long-Term Debt 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 2024 Series A First Mortgage Bonds 4.65 %$350.0 January 2024January 2029Repaid short-term debt, paid capital expenditures and working capital
CL&P Series B First Mortgage Bonds4.95 %300.0 August 2024August 2034Repaid Series D Bonds, repaid short-term debt, and working capital
CL&P Series D First Mortgage Bonds7.875 %(139.8)October 2024October 2024Paid at maturity
CL&P 2025 Series A First Mortgage Bonds4.95 %400.0 January 2025January 2030Repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric Debentures5.40 %600.0 May 2024June 2034Repaid short-term debt, paid capital expenditures and working capital
PSNH Series X First Mortgage Bonds5.35 %300.0 April 2024October 2033Repaid short-term debt, paid capital expenditures and working capital
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
Eversource Parent Series FF Senior Notes5.85 %700.0 April 2024April 2031Repaid Series X Senior Notes and Aquarion’s 2014 Senior Notes at maturity and short-term debt
Eversource Parent Series GG Senior Notes5.95 %700.0 April 2024July 2034Repaid Series X Senior Notes and Aquarion’s 2014 Senior Notes at maturity and short-term debt
Eversource Parent Series X Senior Notes4.20 %(900.0)June 2024June 2024Paid at maturity
Eversource Parent Series L Senior Notes2.90 %(450.0)October 2024October 2024Paid at maturity
Eversource Parent Series H Senior Notes3.15 %(300.0)January 2025January 2025Paid at maturity
NSTAR Gas Series W First Mortgage Bonds5.29 %160.0 June 2024June 2029Repaid short-term debt, paid capital expenditures and general corporate purposes
NSTAR Gas Series X First Mortgage Bonds5.48 %40.0 June 2024June 2034Repaid short-term debt, paid capital expenditures and general corporate purposes
Yankee Gas Series W First Mortgage Bonds5.50 %90.0 July 2024July 2029Repaid short-term debt, paid capital expenditures, working capital and repaid Series P bonds at maturity
Yankee Gas Series X First Mortgage Bonds5.74 %90.0 July 2024July 2034Repaid short-term debt, paid capital expenditures, working capital and repaid Series P bonds at maturity
Yankee Gas Series P First Mortgage Bonds2.23 %(100.0)October 2024October 2024Paid at maturity
EGMA Series E First Mortgage Bonds5.17 %100.0 October 2024November 2034Refinanced existing indebtedness, paid capital expenditures and general corporate purposes
Aquarion Senior Notes4.00 %(360.0)August 2024August 2024Paid at maturity
Aquarion Water Company of Connecticut Senior Notes5.57 %70.0 August 2024September 2034Repaid short-term debt, 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 2025 through 2029 and thereafter are shown below. These amounts exclude PSNH rate reduction bonds, CYAPC pre-1983 spent nuclear fuel obligation, and unamortized premiums, discounts, and debt issuance costs as of December 31, 2024:
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH
2025$1,400.3 $400.0 $250.0 $— 
20261,390.2 — 300.0 — 
20272,889.2 500.0 700.0 — 
20281,978.5 — 150.0 — 
20292,300.3 350.0 400.0 — 
Thereafter16,857.0 3,880.0 3,340.0 1,750.0 
Total$26,815.5 $5,130.0 $5,140.0 $1,750.0