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Regulatory Matters (Tables) | 3 Months Ended
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Mar. 31, 2019
Regulated Operations [Abstract] |
Summary of Additional Virginia Power Electric Transmission Projects Approved or Applied | Additional Virginia Power electric transmission projects approved or applied for in 2019 are as follows:
Description and Location of Project |  | Application Date |  | Approval Date |  | Type of Line |  | Miles of Lines |  | Cost Estimate (millions) |
Partial rebuild of overhead transmission lines in Alleghany County, Virginia and Covington, Virginia |  | August 2018 |  | April 2019 |  | 138 kV |  | 5 |  | $ | 15 |
Rebuild and operate between Lanexa and the Northern Neck in Virginia |  | June 2018 |  | February 2019 |  | 230 kV |  | 3 |  |  | 30 |
Rebuild and operate the Glebe substation and relocate and operate in Arlington County, Virginia and the City of Alexandria, Virginia existing overhead line underground |  | March 2019 |  | Pending |  | 230 kV |  | <1 |  |  | 125 |
Rebuild and operate between Valley, Virginia and Mt. Storm, West Virginia |  | April 2019 |  | Pending |  | 500 kV |  | 65 |  |  | 290 |

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