Description Even when the Allegheny Moon isn't shining, Allegheny Energy (AE) can provide plenty of light. Its Allegheny Power unit provides electricity to more than 1.5 million customers in Maryland, Pennsylvania, West Virginia, and Virginia through regulated utilities Monongahela Power, Potomac Edison, and West Penn Power. Subsidiary Allegheny Energy Supply provides power to AE's utilities and sells electricity to wholesale and retail customers. Subsidiary Allegheny Ventures controls Allegheny Energy Solutions (energy consulting). It also has transmission line design and management units (Trans-Allegheny Interstate Line Company and PATH, LLC). In 2011 the company was bought by FirstEnergy in an $8.5 billion deal.