Allegheny Energy operated its electric distribution operations under the trade name Allegheny Power. Its regulated subsidiaries were
West Penn Power (serving Southwestern and Central Pennsylvania),
Monongahela Power ("Mon Power," serving Northern and Southern West Virginia, as well as
Hancock and
Brooke Counties in the
Northern Panhandle), and
The Potomac Edison Company (western Maryland, parts of eastern West Virginia, and (until 2010) northern Virginia). The electric generating plants were operated by subsidiary Allegheny Energy Supply Company and Monongahela Power. In 1999, Monongahela Power purchased the distribution assets of West Virginia Power, a utility owned by
UtiliCorp United based in
Lewisburg, West Virginia. West Virginia Power's operations were centered on portions of southeastern West Virginia. It is said UtiliCorp sold the subsidiary to concentrate on its main operations in the midwestern US. UtiliCorp had purchased the division from
Dominion Resources in 1986, of which it had operated as the West Virginia Power division of Virginia Electric & Power Company (VEPCO). Allegheny Energy formerly operated in sections of eastern
Ohio, until early 2006, when regulatory issues within Ohio forced them to sell the territory to Columbus Southern Power, a division of
American Electric Power, Inc. In 2010, Allegheny officially sold their Virginia service area. Counties west of the
Blue Ridge Mountains were purchased by Shenandoah Valley Electric Cooperative of
Mount Crawford, Virginia, while counties to the east were sold to Rappahannock Electric Cooperative of
Fredericksburg, Virginia. ==Merger==