What is PJM?
PJM Interconnection, L.L.C. is the regional transmission organization (RTO) responsible for coordinating the movement of electricity in all or parts of Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia and the District of Columbia. Regional transmission organizations were established by FERC Order 2000 and are federally regulated entities with operational authority for all transmission facilities under their functional control. Within its territory, PJM controls the high-voltage transmission grid, tells power producers how much energy to generate, and adjusts import and export transactions.

On March 6, 2006, PJM filed a request to the Department of Energy asking them to designate a path into the DC-Baltimore Metropolitan Region as a "National Interest Electric Transmission Corridor." Pursuant to the Energy Policy Act of 2005, the designation of a 'National Interest Corridor' would grant PJM a right-of-way that could potentially override county or state level opposition.

On June 23, 2006, PJM announced $1.3 billion in transmission upgrades, "including a 240-mile, 500-kilovolt transmission line from southwestern Pennsylvania to Virginia to be constructed by Allegheny Power and Dominion."

On August 8, 2006 the Department of Energy released the 2006 National Electric Transmission Congestion Study.

On October 10, 2006, in response to a comment period on the aforementioned Congestion Study, PJM submitted their revised National Interest Electric Transmission Corridor requests. PJM is now requesting designation of three National Interest Corridors - the Allegheny Mountain Corridor, the Delaware River Corridor and the Mid-Atlantic Corridor. The Allegheny Mountain Corridor is their stated priority, and also the one tailored to the Meadowbrook-Loudoun Transmission Line.