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LONG-TERM DEBT (Tables)
 12 Months Ended
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)202320222023202220232022
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 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.
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 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
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)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