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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Effective Income Tax | For continuing operations, including noncontrolling interests, the statutory U.S. federal income tax rate reconciles to the Companies’ effective income tax rate as follows:
|  | Dominion Energy |  |  | Virginia Power |
Nine Months Ended September 30, |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
U.S. statutory rate |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | %
Increases (reductions) resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  | 3.9 |  |  |  | 3.2 |  |  |  | 4.4 |  |  |  | 4.4 |
Investment tax credits |  |  | (2.4 | ) |  |  | (1.4 | ) |  |  | (0.8 | ) |  |  | (0.8 | )
Production tax credits |  |  | (4.7 | ) |  |  | (3.2 | ) |  |  | (4.1 | ) |  |  | (3.0 | )
Reversal of excess deferred income taxes |  |  | (1.6 | ) |  |  | (2.7 | ) |  |  | (1.7 | ) |  |  | (1.8 | )
Qualified nuclear decommissioning trust net gains (losses) |  |  | 2.5 |  |  |  | 4.0 |  |  |  | 0.5 |  |  |  | 0.6 |
Remeasurements and settlements of uncertain tax positions |  |  | (1.0 | ) |  |  | — |  |  |  | — |  |  |  | — |
AFUDC - equity |  |  | (0.7 | ) |  |  | (0.7 | ) |  |  | (1.0 | ) |  |  | (0.6 | )
Absence of tax on noncontrolling interest |  |  | (1.2 | ) |  |  | — |  |  |  | (1.8 | ) |  |  | — |
Other, net |  |  | (0.1 | ) |  |  | (0.3 | ) |  |  | (0.1 | ) |  |  | 0.3 |
Effective tax rate |  |  | 15.7 | % |  |  | 19.9 | % |  |  | 16.4 | % |  |  | 20.1 | %
Reconciliation of Changes in Unrecognized Tax Benefits | A reconciliation of changes in Dominion Energy’s and Virginia Power’s unrecognized tax benefits follows for the current period:
|  | Dominion Energy |  |  | Virginia Power |
(millions) |  |  |  |  |  |
Balance at January 1, 2025 |  | $ | 170 |  |  | $ | 56 |
Prior period positions - increases |  |  | — |  |  |  | — |
Prior period positions - decreases |  |  | (38 | ) |  |  | — |
Current period positions - increases |  |  | 3 |  |  |  | 2 |
Settlements with tax authorities |  |  | — |  |  |  | — |
Expiration of statutes of limitations |  |  | — |  |  |  | — |
Balance at September 30, 2025 |  | $ | 135 |  |  | $ | 58 |

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