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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Tax Disclosure [Abstract] |
Components of Income Tax Expense | The components of income tax expense are as follows:
Eversource (Millions of Dollars) | For the Years Ended December 31,
2024 |  | 2023 |  | 2022
Current Income Taxes: |  |  |  |  |
Federal | $ | (23.4) |  |  | $ | 75.8 |  |  | $ | 95.8 |
State | 14.3 |  |  | 0.6 |  |  | 13.6 |
Total Current | (9.1) |  |  | 76.4 |  |  | 109.4 |
Deferred Income Taxes, Net: |  |  |  |  |
Federal | 266.3 |  |  | (0.9) |  |  | 198.8 |
State | 169.6 |  |  | 86.3 |  |  | 148.0 |
Total Deferred | 435.9 |  |  | 85.4 |  |  | 346.8 |
Investment Tax Credits, Net | (2.1) |  |  | (2.1) |  |  | (2.6) |
Income Tax Expense | $ | 424.7 |  |  | $ | 159.7 |  |  | $ | 453.6 |
| For the Years Ended December 31,
| 2024 |  | 2023 |  | 2022
(Millions of Dollars) | CL&P |  | NSTAR Electric |  | PSNH |  | CL&P |  | NSTAR Electric |  | PSNH |  | CL&P |  | NSTAR Electric |  | PSNH
Current Income Taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal | $ | 25.9 |  |  | $ | 65.9 |  |  | $ | (1.7) |  |  | $ | (10.8) |  |  | $ | 50.7 |  |  | $ | (40.0) |  |  | $ | 106.2 |  |  | $ | 55.0 |  |  | $ | 29.6 |
State | (6.8) |  |  | 15.2 |  |  | (5.2) |  |  | (2.3) |  |  | 7.8 |  |  | (20.0) |  |  | 20.1 |  |  | 8.7 |  |  | 5.9 |
Total Current | 19.1 |  |  | 81.1 |  |  | (6.9) |  |  | (13.1) |  |  | 58.5 |  |  | (60.0) |  |  | 126.3 |  |  | 63.7 |  |  | 35.5 |
Deferred Income Taxes, Net: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal | 107.9 |  |  | 63.9 |  |  | 50.8 |  |  | 130.3 |  |  | 50.1 |  |  | 81.2 |  |  | 17.2 |  |  | 35.6 |  |  | 5.9 |
State | 67.5 |  |  | 47.3 |  |  | 26.3 |  |  | 53.7 |  |  | 46.1 |  |  | 37.8 |  |  | 28.2 |  |  | 42.4 |  |  | 9.9 |
Total Deferred | 175.4 |  |  | 111.2 |  |  | 77.1 |  |  | 184.0 |  |  | 96.2 |  |  | 119.0 |  |  | 45.4 |  |  | 78.0 |  |  | 15.8 |
Investment Tax Credits, Net | — |  |  | (1.7) |  |  | — |  |  | — |  |  | (1.7) |  |  | — |  |  | (0.5) |  |  | (1.7) |  |  | — |
Income Tax Expense | $ | 194.5 |  |  | $ | 190.6 |  |  | $ | 70.2 |  |  | $ | 170.9 |  |  | $ | 153.0 |  |  | $ | 59.0 |  |  | $ | 171.2 |  |  | $ | 140.0 |  |  | $ | 51.3 |
Summary of Reconciliation Between Income Tax Expense and Expected Tax | A reconciliation between income tax expense and the expected tax expense at the statutory rate is as follows:
Eversource (Millions of Dollars, except percentages) | For the Years Ended December 31,
2024 |  | 2023 |  | 2022
Income/(Loss) Before Income Tax Expense | $ | 1,243.8 |  |  | $ | (275.0) |  |  | $ | 1,866.0 |
Statutory Federal Income Tax Expense at 21% | 261.2 |  |  | (57.7) |  |  | 391.9 |
Tax Effect of Differences: |  |  |  |  |
Depreciation | (22.6) |  |  | (25.8) |  |  | (17.1) |
Investment Tax Credit Amortization | (2.1) |  |  | (2.1) |  |  | (2.6) |
Other Federal Tax Credits | (67.0) |  |  | (42.5) |  |  | — |
State Income Taxes, Net of Federal Impact | 43.2 |  |  | (11.4) |  |  | 75.9 |
Dividends on ESOP | (5.5) |  |  | (5.3) |  |  | (5.1) |
Tax Asset Valuation Allowance/Reserve Adjustments | 278.6 |  |  | 295.8 |  |  | 51.6 |
Tax Deficiency/(Excess Stock Benefit) | 2.3 |  |  | 0.5 |  |  | (2.1) |
EDIT Amortization | (37.0) |  |  | (51.5) |  |  | (49.1) |
Other, Net | (26.4) |  |  | 59.7 |  |  | 10.2 |
Income Tax Expense | $ | 424.7 |  |  | $ | 159.7 |  |  | $ | 453.6 |
Effective Tax Rate | 34.1 | % |  | (58.1) | % |  | 24.3 | %
| For the Years Ended December 31,
| 2024 |  | 2023 |  | 2022
(Millions of Dollars, except percentages) | CL&P |  | NSTAR Electric |  | PSNH |  | CL&P |  | NSTAR Electric |  | PSNH |  | CL&P |  | NSTAR Electric |  | PSNH
Income Before Income Tax Expense | $ | 707.1 |  |  | $ | 826.9 |  |  | $ | 285.1 |  |  | $ | 689.6 |  |  | $ | 697.5 |  |  | $ | 254.7 |  |  | $ | 704.1 |  |  | $ | 632.4 |  |  | $ | 222.9 |
Statutory Federal Income Tax Expense at 21% | 148.5 |  |  | 173.7 |  |  | 59.9 |  |  | 144.9 |  |  | 146.5 |  |  | 53.5 |  |  | 147.9 |  |  | 132.8 |  |  | 46.8 |
Tax Effect of Differences: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation | 0.4 |  |  | (10.9) |  |  | (1.0) |  |  | (5.6) |  |  | (8.8) |  |  | (1.0) |  |  | (3.7) |  |  | (4.2) |  |  | 0.9 |
Investment Tax Credit Amortization | — |  |  | (1.7) |  |  | — |  |  | — |  |  | (1.7) |  |  | — |  |  | (0.5) |  |  | (1.7) |  |  | — |
State Income Taxes, Net of Federal Impact | (2.8) |  |  | 49.4 |  |  | 16.7 |  |  | (10.7) |  |  | 42.5 |  |  | 14.1 |  |  | (6.6) |  |  | 40.3 |  |  | 12.5 |
Tax Asset Valuation Allowance/Reserve Adjustments | 50.8 |  |  | — |  |  | — |  |  | 51.3 |  |  | — |  |  | — |  |  | 44.7 |  |  | — |  |  | — |
Tax Deficiency/(Excess Stock Benefit) | 0.8 |  |  | 0.8 |  |  | 0.3 |  |  | 0.2 |  |  | 0.2 |  |  | 0.1 |  |  | (0.7) |  |  | (0.8) |  |  | (0.3) |
EDIT Amortization | (9.2) |  |  | (20.0) |  |  | (6.5) |  |  | (10.5) |  |  | (28.4) |  |  | (6.8) |  |  | (9.2) |  |  | (29.2) |  |  | (7.7) |
Other, Net | 6.0 |  |  | (0.7) |  |  | 0.8 |  |  | 1.3 |  |  | 2.7 |  |  | (0.9) |  |  | (0.7) |  |  | 2.8 |  |  | (0.9) |
Income Tax Expense | $ | 194.5 |  |  | $ | 190.6 |  |  | $ | 70.2 |  |  | $ | 170.9 |  |  | $ | 153.0 |  |  | $ | 59.0 |  |  | $ | 171.2 |  |  | $ | 140.0 |  |  | $ | 51.3 |
Effective Tax Rate | 27.5 | % |  | 23.0 | % |  | 24.6 | % |  | 24.8 | % |  | 21.9 | % |  | 23.2 | % |  | 24.3 | % |  | 22.1 | % |  | 23.0 | %
Schedule of Accumulated Deferred Income Tax Obligations | The tax effects of temporary differences that give rise to the net accumulated deferred income tax obligations are as follows:
| As of December 31,
| 2024 |  | 2023
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Deferred Tax Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefits | $ | 266.9 |  |  | $ | 33.7 |  |  | $ | 83.5 |  |  | $ | 14.5 |  |  | $ | 244.5 |  |  | $ | 29.9 |  |  | $ | 66.8 |  |  | $ | 13.0 |
Derivative Liabilities | 19.6 |  |  | 19.6 |  |  | — |  |  | — |  |  | 33.0 |  |  | 33.0 |  |  | — |  |  | — |
Regulatory Deferrals - Liabilities | 508.7 |  |  | 128.0 |  |  | 316.7 |  |  | 19.6 |  |  | 452.0 |  |  | 94.4 |  |  | 291.5 |  |  | 23.8 |
Allowance for Uncollectible Accounts | 145.3 |  |  | 75.4 |  |  | 26.5 |  |  | 3.8 |  |  | 143.8 |  |  | 79.6 |  |  | 21.5 |  |  | 3.9 |
Tax Effect - Tax Regulatory Liabilities | 720.8 |  |  | 317.6 |  |  | 214.3 |  |  | 93.2 |  |  | 739.0 |  |  | 320.7 |  |  | 227.1 |  |  | 95.5 |
Net Operating Loss Carryforwards | 198.2 |  |  | — |  |  | — |  |  | 1.5 |  |  | 13.8 |  |  | — |  |  | — |  |  | — |
Purchase Accounting Adjustment | 52.1 |  |  | — |  |  | — |  |  | — |  |  | 56.7 |  |  | — |  |  | — |  |  | — |
Equity Method Wind Investments | 1,098.6 |  |  | — |  |  | — |  |  | — |  |  | 584.9 |  |  | — |  |  | — |  |  | — |
Other | 267.1 |  |  | 134.7 |  |  | 31.5 |  |  | 24.1 |  |  | 200.1 |  |  | 125.3 |  |  | 25.0 |  |  | 23.4 |
Total Deferred Tax Assets | 3,277.3 |  |  | 709.0 |  |  | 672.5 |  |  | 156.7 |  |  | 2,467.8 |  |  | 682.9 |  |  | 631.9 |  |  | 159.6 |
Less: Valuation Allowance (1) | 558.2 |  |  | 104.1 |  |  | — |  |  | — |  |  | 328.1 |  |  | 80.6 |  |  | — |  |  | — |
Net Deferred Tax Assets | $ | 2,719.1 |  |  | $ | 604.9 |  |  | $ | 672.5 |  |  | $ | 156.7 |  |  | $ | 2,139.7 |  |  | $ | 602.3 |  |  | $ | 631.9 |  |  | $ | 159.6 |
Deferred Tax Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Depreciation and Other Plant-Related Differences | $ | 5,493.3 |  |  | $ | 1,820.3 |  |  | $ | 1,845.2 |  |  | $ | 618.4 |  |  | $ | 5,103.3 |  |  | $ | 1,703.4 |  |  | $ | 1,728.6 |  |  | $ | 566.5 |
Property Tax Accruals | 107.4 |  |  | 49.8 |  |  | 44.5 |  |  | 6.5 |  |  | 95.0 |  |  | 42.0 |  |  | 39.8 |  |  | 6.3 |
Regulatory Amounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Deferrals - Assets | 1,709.1 |  |  | 522.9 |  |  | 519.9 |  |  | 277.8 |  |  | 1,512.3 |  |  | 470.0 |  |  | 474.5 |  |  | 250.3 |
Tax Effect - Tax Regulatory Assets | 294.5 |  |  | 194.7 |  |  | 10.0 |  |  | 9.4 |  |  | 284.0 |  |  | 191.9 |  |  | 10.5 |  |  | 8.3 |
Goodwill-related Regulatory Asset - 1999 Merger | 67.5 |  |  | — |  |  | 58.0 |  |  | — |  |  | 72.2 |  |  | — |  |  | 61.9 |  |  | — |
Employee Benefits | 353.0 |  |  | 51.0 |  |  | 175.4 |  |  | 23.5 |  |  | 282.0 |  |  | 38.8 |  |  | 146.7 |  |  | 16.8 |
Derivative Assets | 3.8 |  |  | 3.8 |  |  | — |  |  | — |  |  | 6.4 |  |  | 6.4 |  |  | — |  |  | — |
Other | 101.7 |  |  | 15.2 |  |  | 24.9 |  |  | 2.7 |  |  | 88.2 |  |  | 9.9 |  |  | 19.5 |  |  | 2.9 |
Total Deferred Tax Liabilities | $ | 8,130.3 |  |  | $ | 2,657.7 |  |  | $ | 2,677.9 |  |  | $ | 938.3 |  |  | $ | 7,443.4 |  |  | $ | 2,462.4 |  |  | $ | 2,481.5 |  |  | $ | 851.1 |
(1) As of December 31, 2024 and 2023, the Eversource Valuation Allowance of $558.2 million and $328.1 million, includes $427.0 million and $224.0 million, respectively, related to Eversource’s share of offshore wind investments.
Summary of Tax Credits and Loss Carryforwards | The following table provides the amounts and expiration dates of state tax credit and loss carryforwards and federal tax credit and net operating loss carryforwards:
| As of December 31,
| 2024 |  | 2023
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Expiration Range |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Expiration Range
Federal Net Operating Loss | $ | 877.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7.1 |  |  | — |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | —
Federal Tax Credit | 404.1 |  |  | — |  |  | — |  |  | — |  |  | 2044 |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Federal Capital Loss | 2,700.0 |  |  | — |  |  | — |  |  | — |  |  | 2024 - 2029 |  | — |  |  | — |  |  | — |  |  | — |  |  | —
State Net Operating Loss | 214.1 |  |  | — |  |  | — |  |  | — |  |  | 2024 - 2044 |  | 243.4 |  |  | — |  |  | — |  |  | — |  |  | 2023 - 2041
State Tax Credit | 238.3 |  |  | 157.7 |  |  | — |  |  | — |  |  | 2024 - 2029 |  | 228.5 |  |  | 157.5 |  |  | — |  |  | — |  |  | 2023 - 2028
State Capital Loss | 2,700.0 |  |  | — |  |  | — |  |  | — |  |  | 2024 - 2029 |  | — |  |  | — |  |  | — |  |  | — |  |  | —
State Charitable Contribution | 15.2 |  |  | — |  |  | — |  |  | — |  |  | 2024 - 2028 |  | 7.9 |  |  | — |  |  | — |  |  | — |  |  | 2023 - 2027
Schedule of Unrecognized Tax Benefits Roll Forward | A reconciliation of the activity in unrecognized tax benefits, all of which would impact the effective tax rate if recognized, is as follows:
(Millions of Dollars) | Eversource |  | CL&P
Balance as of January 1, 2022 | $ | 65.8 |  |  | $ | 26.2 |
Gross Increases - Current Year | 11.5 |  |  | 3.5 |
Gross Decreases - Prior Year | (2.4) |  |  | (0.9) |
Lapse of Statute of Limitations | (7.8) |  |  | (3.3) |
Balance as of December 31, 2022 | 67.1 |  |  | 25.5 |
Gross Increases - Current Year | 23.4 |  |  | 4.0 |
Gross Increases - Prior Year | 0.1 |  |  | 0.1 |
Gross Decreases - Prior Year | (0.1) |  |  | — |
Lapse of Statute of Limitations | (9.2) |  |  | (3.8) |
Balance as of December 31, 2023 | 81.3 |  |  | 25.8 |
Gross Increases - Current Year | 14.2 |  |  | 2.9 |
Gross Increases - Prior Year | 11.0 |  |  | — |
Gross Decreases - Prior Year | (0.2) |  |  | (0.2) |
Lapse of Statute of Limitations | (12.6) |  |  | (6.6) |
Balance as of December 31, 2024 | $ | 93.7 |  |  | $ | 21.9 |
Summary of Income Tax Examinations | The following table summarizes Eversource, CL&P, NSTAR Electric, and PSNH's tax years that remain subject to examination by major tax jurisdictions as of December 31, 2024:
Description | Tax Years
Federal | 2022 - 2024(1)
Connecticut | 2021 - 2024
Massachusetts | 2022 - 2024
New Hampshire | 2021 - 2024
(1) The Company’s Corporate Income Tax Returns for 2022 and 2023 were reviewed and closed as part of the annual IRS CAP program, with the exception for partnership investments of the Company. The Company was recently informed of an IRS audit of one of the partnership returns for the tax year 2022 and the IRS reserves the right to audit 2023. The Company recorded in the above Unrecognized Tax Benefits a reserve associated with this Partnership audit. These years remain open in relation to those audits.

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