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Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Parenthetical) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) Project Agreement Program
Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Additional total revenue requirement |  |  | $ 17
Public utilities requested rate increase annual revenue of pending applications approval |  |  | $ 36
Rider CE |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public utilities number of small scale solar project | Agreement |  |  | 2
Public utilities number of power purchase agreements | Agreement |  |  | 19
Rider CE | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement | [1],[2] |  | $ 182
Public utilities number of solar generation projects | Project |  |  | 2
Rider CE One | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement | [2],[3] |  | $ 325
Public utilities number of solar generation projects | Project |  |  | 6
Non-jurisdictional generation facilities aggregate recorded cost |  |  | $ 251
Public utilities number of energy storage project | Project |  |  | 2
Public utilities number of small scale solar project | Project |  |  | 3
Public utilities number of power purchase agreements | Agreement |  |  | 10
Consolidation of Riders BW, GV and Four Other Riders | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  | $ 348 |
Electric Distribution Grid Transformation Projects | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  |  | $ 100
Electric Distribution Grid Transformation Projects One | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  |  | 120
Underground Distribution Facilities | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  |  | 167
Underground Distribution Facilities One | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  |  | 178
Rural Broadband Capacity Project | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  |  | 35
Rider Associated With Rural Broadband Capacity Project [Member] | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  |  | 25
Rider T1 | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement | [2],[4] |  | 1,343
Rider T1 | Virginia Electric and Power Company | Operating Segments | Virginia Regulation |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  |  | 782
Rider T1 | Virginia Electric and Power Company | Operating Segments | Transmission Component Of Virginia Powers | Virginia Regulation |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement |  |  | 561
Rider SNA | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement | [2],[5] |  | 207
Rider SNA | Virginia Electric and Power Company | Operating Segments | Second Phase Of Nuclear Life Extension Program | Virginia Regulation |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Projected capital investment |  |  | 1,700
DSM Riders | Virginia Electric and Power Company |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total revenue requirement | [2],[6] |  | 96
DSM Riders | Virginia Electric and Power Company | Virginia Regulation |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amount of cost cap recovery |  |  | $ 218
Public utilities energy efficiency program cost exceed percentage |  |  | 15.00%
DSM Riders | Virginia Electric and Power Company | Operating Segments | Virginia Regulation |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Number of new demand response programs | Program |  |  | 1
Number of new redesigned demand response programs | Program |  |  | 2
DSM Riders | Virginia Electric and Power Company | Energy Efficiency Program | Operating Segments | Virginia Regulation |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Number of redesigned energy efficiency programs | Program |  |  | 3
[1] | Associated with two solar generation projects, two small-scale solar projects and 19 purchased power agreements in addition to previously approved Rider CE projects.
[2] | In addition, Virginia Power has a rider associated with another project with a total annual revenue requirement of $17 million and a pending application associated with the Chesterfield Energy Reliability Center described above, which if approved would result in an annual revenue requirement increase of $36 million.
[3] | Associated with six solar generation projects, including Bedford and Pumpkinseed (non-jurisdictional generation facilities with an aggregate recorded cost of $251 million at September 30, 2025), two energy storage projects, three small-scale solar projects, 10 purchased power agreements and certain costs associated with expanding solar and storage facilities in addition to previously approved Rider CE projects.
[4] | Consists of $561 million for the transmission component of Virginia Power’s base rates and $782 million for Rider T1.
[5] | The Virginia Commission also approved Virginia Power’s request for cost recovery of approximately $1.7 billion through Rider SNA for the second phase of the nuclear life extension program which includes investments for calendar years 2025 through 2027.
[6] | Associated with three redesigned energy efficiency programs and one new and two redesigned demand response programs with a $218 million cost cap, with the ability to exceed the cost cap by no more than 15%.

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