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LONG-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2022
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)202220212022202120222021
Eversource Parent Commercial Paper Program $1,442.2 $1,343.0 $557.8 $657.0 4.63 %0.31 %
NSTAR Electric Commercial Paper Program — 162.5 650.0 487.5 — %0.14 %
Details of long-term debt outstanding are as follows:
CL&P
(Millions of Dollars)
As of December 31,
Interest Rate20222021
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 %400.0 400.0 
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 
Total First Mortgage Bonds4,219.8 4,219.8 
Less Amounts due Within One Year(400.0)— 
Current Portion Classified as Long-Term Debt (1)
400.0 — 
Unamortized Premiums and Discounts, Net21.5 23.1 
Unamortized Debt Issuance Costs(24.8)(27.5)
CL&P Long-Term Debt$4,216.5 $4,215.4 
NSTAR Electric
(Millions of Dollars)
As of December 31,
Interest Rate20222021
Debentures:  
2006 Debentures due 20365.750 %$200.0 $200.0 
2010 Debentures due 20405.500 %300.0 300.0 
2012 Debentures due 20222.375 %— 400.0 
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 — 
2022 Debentures due 20524.950 %400.0 — 
Total Debentures4,250.0 3,800.0 
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 80.0 
2016 Senior Notes Series H due 20262.750 %50.0 50.0 
Total Notes220.0 220.0 
Less Amounts due Within One Year(80.0)(400.0)
Unamortized Premiums and Discounts, Net(14.8)(11.2)
Unamortized Debt Issuance Costs(30.1)(23.4)
NSTAR Electric Long-Term Debt$4,345.1 $3,585.4 

PSNH
(Millions of Dollars)
As of December 31,
Interest Rate20222021
First Mortgage Bonds:  
2005 Series M due 20355.600 %$50.0 $50.0 
2013 Series S due 2023  3.500 %325.0 325.0 
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 
Total First Mortgage Bonds1,175.0 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(2.5)(2.6)
Unamortized Debt Issuance Costs(7.9)(8.6)
PSNH Long-Term Debt$1,134.9 $1,163.8 
OTHER
(Millions of Dollars)
As of December 31,
Interest Rate20222021
Yankee Gas - First Mortgage Bonds due 2024 - 20511.380 %-5.350%$845.0 $765.0 
NSTAR Gas - First Mortgage Bonds due 2025 - 20512.250 %-7.110%705.0 580.0 
EGMA - First Mortgage Bonds due 2031 - 20522.110 %-4.700%650.0 550.0 
Aquarion - Senior Notes due 20244.000%360.0 360.0 
Aquarion - Unsecured Notes due 2023 - 2052— %-6.430%464.7 394.9 
Aquarion - Secured Debt due 2023 - 20442.864 %-9.290%34.4 39.6 
Eversource Parent - Senior Notes due 2023 - 20500.800 %-4.600%8,150.0 6,100.0 
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC)11.9 11.7 
Fair Value Adjustment (2)
26.2 43.8 
Less Fair Value Adjustment - Current Portion (2)
(7.0)(17.7)
Less Amounts due in One Year(1,203.4)(775.4)
Unamortized Premiums and Discounts, Net  40.1 43.4 
Unamortized Debt Issuance Costs (49.4)(36.3)
Total Other Long-Term Debt $10,027.5 $8,059.0 
Total Eversource Long-Term Debt $19,724.0 $17,023.6 

(1)     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
NSTAR Electric 2022 Debentures4.55 %450.0 May 2022June 2052Repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric 2022 Debentures4.95 %400.0 September 2022September 2052Refinanced investments in eligible green expenditures, which were previously financed using short-term debt from October 1, 2020 through June 30, 2022
NSTAR Electric 2012 Debentures 2.375 %(400.0)October 2022October 2022Paid at maturity
PSNH Series W First Mortgage Bonds5.15 %300.0 January 2023January 2053Repaid short-term debt, paid capital expenditures and working capital
Eversource Parent Series V Senior Notes2.90 %650.0 February 2022March 2027Repaid Series K Senior Notes at maturity and short-term debt
Eversource Parent Series W Senior Notes3.375 %650.0 February 2022March 2032Repaid Series K Senior Notes at maturity and short-term debt
Eversource Parent Series X Senior Notes4.20 %900.0 June 2022June 2024Repaid short-term debt and paid working capital
Eversource Parent Series Y Senior Notes4.60 %600.0 June 2022July 2027Repaid short-term debt and paid working capital
Eversource Parent Series K Senior Notes2.75 %(750.0)March 2022March 2022Paid at maturity
Yankee Gas Series B First Mortgage Bonds8.48 %(20.0)March 2022March 2022Paid at maturity
Yankee Gas Series U First Mortgage Bonds4.31 %100.0 September 2022September 2032Repaid short-term debt, paid capital expenditures and for general corporate purposes
EGMA Series C First Mortgage Bonds4.70 %100.0 June 2022June 2052Repaid short-term debt, paid capital expenditures and for general corporate purposes
NSTAR Gas Series V First Mortgage Bonds 4.40 %125.0 July 2022August 2032Repaid short-term debt, paid capital expenditures and for general corporate purposes
Aquarion Water Company of New Hampshire General Mortgage Bonds4.45 %(5.0)July 2022July 2022Paid at maturity
Aquarion Water Company of Connecticut Senior Notes4.69 %70.0 August 2022September 2052Repaid short-term debt
Schedule of Maturities of Long-Term Debt Outstanding Long-term debt maturities on debt outstanding for the years 2023 through 2027 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, 2022:
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH
2023$2,008.4 $400.0 $80.0 $325.0 
20241,950.0 139.8 — — 
20251,400.2 400.0 250.0 — 
2026940.2 — 300.0 — 
20272,539.2 500.0 700.0 — 
Thereafter12,236.0 2,780.0 3,140.0 850.0 
Total$21,074.0 $4,219.8 $4,470.0 $1,175.0