PJM Interconnection LLC (PJM) is a Regional Transmission Organization (RTO) which is part of the Eastern Interconnection grid operating an electric transmission system serving 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, headquartered in Valley Forge, Pennsylvania, is currently the world's largest competitive wholesale electricity market