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LONG-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2021
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)202120202021202020212020
Eversource Parent Commercial Paper Program $1,343.0 $1,054.3 $657.0 $945.7 0.31 %0.25 %
NSTAR Electric Commercial Paper Program 162.5 195.0 487.5 455.0 0.14 %0.16 %
Details of long-term debt outstanding are as follows:
CL&P
(Millions of Dollars)
As of December 31,
20212020
First Mortgage Bonds:  
7.875% 1994 Series D due 2024
$139.8 $139.8 
5.750% 2004 Series B due 2034
130.0 130.0 
5.625% 2005 Series B due 2035
100.0 100.0 
6.350% 2006 Series A due 2036
250.0 250.0 
5.750% 2007 Series B due 2037
150.0 150.0 
6.375% 2007 Series D due 2037
100.0 100.0 
2.500% 2013 Series A due 2023
400.0 400.0 
4.300% 2014 Series A due 2044  
475.0 475.0 
4.150% 2015 Series A due 2045
350.0 350.0 
   3.200% 2017 Series A due 2027
500.0 500.0 
4.000% 2018 Series A due 2048
800.0 800.0 
0.750% 2020 Series A due 2025
400.0 400.0 
2.050% 2021 Series A due 2031
425.0 — 
Total First Mortgage Bonds4,219.8 3,794.8 
Pollution Control Revenue Bonds:  
4.375% Fixed Rate Tax Exempt due 2028
— 120.5 
Unamortized Premiums and Discounts, Net23.1 25.9 
Unamortized Debt Issuance Costs(27.5)(26.4)
CL&P Long-Term Debt$4,215.4 $3,914.8 
NSTAR Electric
(Millions of Dollars)
As of December 31,
20212020
Debentures:  
5.750% due 2036
$200.0 $200.0 
5.500% due 2040
300.0 300.0 
2.375% due 2022
400.0 400.0 
4.400% due 2044  
300.0 300.0 
3.250% due 2025
250.0 250.0 
2.700% due 2026
250.0 250.0 
3.200% due 2027
700.0 700.0 
3.250% due 2029
400.0 400.0 
3.950% due 2030
400.0 400.0 
3.100% due 2051
300.0 — 
1.950% due 2031
300.0 — 
Total Debentures3,800.0 3,200.0 
Notes:  
5.900% Senior Notes Series B due 2034
50.0 50.0 
6.700% Senior Notes Series D due 2037
40.0 40.0 
3.500% Senior Notes Series F due 2021
— 250.0 
3.880% Senior Notes Series G due 2023
80.0 80.0 
2.750% Senior Notes Series H due 2026
50.0 50.0 
Total Notes220.0 470.0 
Less Amounts due Within One Year(400.0)(250.0)
Unamortized Premiums and Discounts, Net(11.2)(6.8)
Unamortized Debt Issuance Costs(23.4)(20.0)
NSTAR Electric Long-Term Debt$3,585.4 $3,393.2 
PSNH
(Millions of Dollars)
As of December 31,
20212020
First Mortgage Bonds:  
5.600% Series M due 2035
$50.0 $50.0 
4.050% Series Q due 2021
— 122.0 
3.200% Series R due 2021
— 160.0 
3.500% Series S due 2023  
325.0 325.0 
3.600% Series T due 2049  
300.0 300.0 
2.400% Series U due 2050
150.0 150.0 
2.200% Series V due 2031
350.0 — 
Total First Mortgage Bonds1,175.0 1,107.0 
Less Amounts due Within One Year— (282.0)
Unamortized Premiums and Discounts, Net(2.6)(1.5)
Unamortized Debt Issuance Costs(8.6)(6.4)
PSNH Long-Term Debt$1,163.8 $817.1 
OTHER
(Millions of Dollars)
As of December 31,
20212020
Yankee Gas - First Mortgage Bonds: 1.380% - 8.480% due 2022 - 2051
$765.0 $640.0 
NSTAR Gas - First Mortgage Bonds: 2.250% - 7.110% due 2025 - 2051
580.0 500.0 
EGMA - First Mortgage Bonds: 2.110% - 2.920% due 2031 - 2051
550.0 — 
Aquarion - Senior Notes 4.000% due 2024
360.0 360.0 
Aquarion - Unsecured Notes 0% - 6.430% due 2023 - 2051
394.9 335.2 
Aquarion - Secured Debt 1.296% - 9.290% due 2022 - 2044
39.6 35.9 
Eversource Parent - Senior Notes 0.300% - 4.250% due 2022 - 2050
6,100.0 5,550.0 
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC)11.7 11.7 
Fair Value Adjustment (1)
43.8 74.7 
Less Fair Value Adjustment - Current Portion (1)
(17.7)(31.0)
Less Amounts due in One Year(775.4)(490.2)
Unamortized Premiums and Discounts, Net  43.4 46.5 
Unamortized Debt Issuance Costs (36.3)(32.0)
Total Other Long-Term Debt $8,059.0 $7,000.8 
Total Eversource Long-Term Debt $17,023.6 $15,125.9 
(1)     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 March 31, 2021, the DPU approved NSTAR Electric's request for authorization to issue up to $1.60 billion in long-term debt through December 31, 2023. On September 10, 2021, the DPU approved EGMA’s request for authorization to issue up to $725.0 million in long-term debt through December 31, 2023. The remaining Eversource operating companies, including CL&P and PSNH, have utilized the long-term debt authorizations in place with the respective regulatory commissions.
Schedule of Issuance and Repayments of Long-Term Debt The following table summarizes long-term debt issuances and repayments:
(Millions of Dollars)Issuance/(Repayment)Issue Date or Repayment DateMaturity DateUse of Proceeds for Issuance/
Repayment Information
CL&P:
2.05% Series A First Mortgage Bonds
$425.0 June 2021July 2031Repaid short-term debt, paid capital expenditures and working capital
4.38% Series A PCRB
(120.5)September 2021September 2028Paid on par call date in advance of maturity
NSTAR Electric:
3.10% 2021 Debentures
300.0 May 2021June 2051
Refinanced investments in eligible green
expenditures, which were previously financed in 2019 and 2020
3.50% Series F Senior Notes
(250.0)June 2021September 2021Paid on par call date in advance of maturity
1.95% 2021 Debentures
300.0 August 2021August 2031Repaid short-term debt, paid capital expenditures and working capital
PSNH:
4.05% Series Q First Mortgage Bonds
(122.0)March 2021June 2021Paid on par call date in advance of maturity
3.20% Series R First Mortgage Bonds
(160.0)June 2021September 2021Paid on par call date in advance of maturity
2.20% Series V First Mortgage Bonds
350.0 June 2021June 2031
Repaid short-term debt, including short-term debt used to redeem Series R First Mortgage Bonds, paid capital expenditures and working capital
Other:
Eversource Parent 2.50% Series I Senior Notes
(450.0)February 2021March 2021Paid on par call date in advance of maturity
Eversource Parent 2.55% Series S Senior Notes
350.0 March 2021March 2031Repaid short-term debt, including short-term debt used to redeem Series I Senior Notes
Eversource Parent 1.40% Series U Senior Notes
300.0 August 2021August 2026
Repaid short-term debt
Eversource Parent Variable Rate Series T Senior Notes (1)
350.0 August 2021August 2023
Repaid short-term debt
Aquarion Water Company of Connecticut 3.31%
   Senior Notes
100.0 April 2021April 2051
Repaid 5.50% Notes, repaid short-term debt, paid capital expenditures and working capital
Aquarion Water Company of Connecticut 5.50% Notes
(40.0)April 2021April 2021Paid at maturity
Yankee Gas 1.38% Series S First Mortgage Bonds
90.0 August 2021August 2026
(2)
Yankee Gas 2.88% Series T First Mortgage Bonds
35.0 August 2021August 2051
(2)
EGMA 2.11% Series A First Mortgage Bonds
310.0 September 2021October 2031
(2)
EGMA 2.92% Series B First Mortgage Bonds
240.0 September 2021October 2051
(2)
NSTAR Gas 2.25% Series T First Mortgage Bonds
40.0 October 2021November 2031
(2)
NSTAR Gas 3.03% Series U First Mortgage Bonds
40.0 October 2021November 2051
(2)

(1) On August 13, 2021, Eversource Parent issued $350 million of floating rate Series T Senior Notes with a maturity date of August 15, 2023. The notes have a coupon rate based on Compounded SOFR plus 0.25%. The notes had an interest rate of 0.30% as of December 31, 2021.

(2)    The use of proceeds from these various issuances refinanced existing indebtedness, funded capital expenditures and were for general corporate purposes. The EGMA indebtedness that was refinanced included $309.4 million of long-term debt.
Schedule of Maturities of Long-Term Debt Outstanding Long-term debt maturities on debt outstanding for the years 2022 through 2026 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, 2021:
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH
2022$1,175.4 $— $400.0 $— 
20232,008.4 400.0 80.0 325.0 
20241,050.1 139.8 — — 
20251,400.2 400.0 250.0 — 
2026940.2 — 300.0 — 
Thereafter11,630.0 3,280.0 2,990.0 850.0 
Total$18,204.3 $4,219.8 $4,020.0 $1,175.0