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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulated Operations [Abstract] |
Summary of Additional Significant Riders Associated with Virginia Power Projects | Additional significant riders associated with various Virginia Power projects are as follows:
Rider Name |  | Application Date |  | Approval Date |  | Rate Year Beginning |  | Total Revenue Requirement (millions) |  |  | Increase (Decrease) Over Previous Year (millions) |
Rider S |  | June 2018 |  | February 2019 |  | April 2019 |  | $ | 215 |  |  | $ | (3 | )
Rider GV |  | June 2018 |  | February 2019 |  | April 2019 |  |  | 120 |  |  |  | 38 |
Rider W |  | June 2018 |  | February 2019 |  | April 2019 |  |  | 105 |  |  |  | (4 | )
Rider R |  | June 2018 |  | February 2019 |  | April 2019 |  |  | 57 |  |  |  | (9 | )
Rider B |  | June 2018 |  | February 2019 |  | April 2019 |  |  | 38 |  |  |  | (9 | )
Rider BW |  | October 2018 |  | Pending |  | September 2019 |  |  | 123 |  |  |  | 7 |
Rider US-2 |  | October 2018 |  | Pending |  | September 2019 |  |  | 16 |  |  |  | 3 |
Rider E |  | December 2018 |  | Pending |  | November 2019 |  |  | 114 |  |  |  | N/A |
Summary of Additional Significant Virginia Power Electric Transmission Projects Approved and Applied | Additional significant Virginia Power electric transmission projects approved and applied for in 2018 are as follows:
Description and Location of Project |  | Application Date |  | Approval Date |  | Type of Line |  |  | Miles of Lines |  |  | Cost Estimate (millions) |
Rebuild and operate existing 115 kV transmission lines between the Possum Point Switching Station and Northern Virginia Electric Cooperative’s Smoketown delivery point |  | June 2017 |  | February 2018 |  |  | 230 kV |  |  |  | 9 |  |  | $ | 20 |
Rebuild and operate between the Dooms substation and the Valley substation, along with associated substation work |  | September 2017 |  | September 2018 |  |  | 500 kV |  |  |  | 18 |  |  |  | 65 |
Build and operate between the Idylwood and Tysons substations, along with associated substation work |  | November 2017 |  | September 2018 |  |  | 230 kV |  |  |  | 4 |  |  |  | 125 |
Rebuild and operate between the Chesterfield and Hopewell substations, along with associated substation work |  | May 2018 |  | November 2018 |  |  | 230 kV |  |  |  | 8 |  |  |  | 30 |
Rebuild and operate between the Chesterfield and Lakeside substations, along with associated substation work |  | May 2018 |  | December 2018 |  |  | 230 kV |  |  |  | 21 |  |  |  | 35 |
Rebuild and operate between the Landstown and Thrasher substations, along with associated substation work |  | June 2018 |  | December 2018 |  |  | 230 kV |  |  |  | 8.5 |  |  |  | 20 |
Partial rebuild of overhead transmission lines in Alleghany County, Virginia and Covington, Virginia |  | August 2018 |  | Pending |  |  | 138 kV |  |  |  | 5 |  |  |  | 15 |
Build a new substation and connect three existing transmission lines thereto in Fluvanna County, Virginia |  | October 2018 |  | Pending |  |  | 230 kV |  |  |  | <1 |  |  |  | 30 |

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