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LONG-TERM DEBT (Tables) | 12 Months Ended
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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) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
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,
2021 |  | 2020
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 Bonds | 4,219.8 |  |  | 3,794.8 |
Pollution Control Revenue Bonds: |  |  |
4.375% Fixed Rate Tax Exempt due 2028 | — |  |  | 120.5 |
Unamortized Premiums and Discounts, Net | 23.1 |  |  | 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,
2021 |  | 2020
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 Debentures | 3,800.0 |  |  | 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 Notes | 220.0 |  |  | 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,
2021 |  | 2020
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 Bonds | 1,175.0 |  |  | 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,
2021 |  | 2020
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 Date |  | Maturity Date |  | Use of Proceeds for Issuance/ Repayment Information
CL&P: |  |  |  |  |  |  |
2.05% Series A First Mortgage Bonds | $ | 425.0 |  |  | June 2021 |  | July 2031 |  | Repaid short-term debt, paid capital expenditures and working capital
4.38% Series A PCRB | (120.5) |  |  | September 2021 |  | September 2028 |  | Paid on par call date in advance of maturity
NSTAR Electric: |  |  |  |  |  |  |
3.10% 2021 Debentures | 300.0 |  |  | May 2021 |  | June 2051 |  | Refinanced investments in eligible green expenditures, which were previously financed in 2019 and 2020
3.50% Series F Senior Notes | (250.0) |  |  | June 2021 |  | September 2021 |  | Paid on par call date in advance of maturity
1.95% 2021 Debentures | 300.0 |  |  | August 2021 |  | August 2031 |  | Repaid short-term debt, paid capital expenditures and working capital
PSNH: |  |  |  |  |  |  |
4.05% Series Q First Mortgage Bonds | (122.0) |  |  | March 2021 |  | June 2021 |  | Paid on par call date in advance of maturity
3.20% Series R First Mortgage Bonds | (160.0) |  |  | June 2021 |  | September 2021 |  | Paid on par call date in advance of maturity
2.20% Series V First Mortgage Bonds | 350.0 |  |  | June 2021 |  | June 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 2021 |  | March 2021 |  | Paid on par call date in advance of maturity
Eversource Parent 2.55% Series S Senior Notes | 350.0 |  |  | March 2021 |  | March 2031 |  | Repaid 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 2021 |  | August 2026 |  | Repaid short-term debt
Eversource Parent Variable Rate Series T Senior Notes (1) | 350.0 |  |  | August 2021 |  | August 2023 |  | Repaid short-term debt
Aquarion Water Company of Connecticut 3.31% Senior Notes | 100.0 |  |  | April 2021 |  | April 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 2021 |  | April 2021 |  | Paid at maturity
Yankee Gas 1.38% Series S First Mortgage Bonds | 90.0 |  |  | August 2021 |  | August 2026 |  | (2)
Yankee Gas 2.88% Series T First Mortgage Bonds | 35.0 |  |  | August 2021 |  | August 2051 |  | (2)
EGMA 2.11% Series A First Mortgage Bonds | 310.0 |  |  | September 2021 |  | October 2031 |  | (2)
EGMA 2.92% Series B First Mortgage Bonds | 240.0 |  |  | September 2021 |  | October 2051 |  | (2)
NSTAR Gas 2.25% Series T First Mortgage Bonds | 40.0 |  |  | October 2021 |  | November 2031 |  | (2)
NSTAR Gas 3.03% Series U First Mortgage Bonds | 40.0 |  |  | October 2021 |  | November 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) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
2022 | $ | 1,175.4 |  |  | $ | — |  |  | $ | 400.0 |  |  | $ | — |
2023 | 2,008.4 |  |  | 400.0 |  |  | 80.0 |  |  | 325.0 |
2024 | 1,050.1 |  |  | 139.8 |  |  | — |  |  | — |
2025 | 1,400.2 |  |  | 400.0 |  |  | 250.0 |  |  | — |
2026 | 940.2 |  |  | — |  |  | 300.0 |  |  | — |
Thereafter | 11,630.0 |  |  | 3,280.0 |  |  | 2,990.0 |  |  | 850.0 |
Total | $ | 18,204.3 |  |  | $ | 4,219.8 |  |  | $ | 4,020.0 |  |  | $ | 1,175.0 |

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