Regulatory Matters (Tables)

12 Months Ended

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