Valley Forge, Pa., June 1, 2011 — PJM Interconnection has assumed operational control of the transmission systems of American Transmission Systems, Inc. and Cleveland Public Power and began administering open, competitive wholesale electricity markets in those areas.
The integration included the following FirstEnergy utilities, Toledo Edison, Ohio Edison, Cleveland Electric Illuminating and Penn Power. All of FirstEnergy's utilities are now in PJM.
With the integrations, PJM's all-time peak demand would have been 158,448 MW. PJM now includes 180,400 MW of generating capacity and more than 61,000 miles of transmission lines.
PJM Interconnection, founded in 1927, ensures the reliability of the high-voltage electric power system serving 58 million people 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.
PJM coordinates and directs the operation of the region's transmission grid, which includes 6,038 substations and 61,000 miles of transmission lines; administers a competitive wholesale electricity market; and plans regional transmission expansion improvements to maintain grid reliability and relieve congestion.