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SHORT-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of Borrowings Outstanding | 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.

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