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By 1985, Dominion split its distribution operations among three operating companies: Virginia Power, North Carolina Power, and West Virginia Power. In 1986, Dominion gained territory by expanding in Northern Virginia after purchasing the Virginia distribution territory of Potomac Electric Power Company (PEPCO). In 1987, the West Virginia Power division was later sold to Utilicorp United, but Dominion retained ownership of the Mount Storm Power Station in West Virginia. (In 1999, West Virginia Power would be sold to Allegheny Energy and folded into its Monongahela Power subsidiary; it and other Allegheny Energy subsidiaries have since been acquired in 2010 by FirstEnergy.)