PJM Interconnection is a regional transmission organization (RTO) that coordinates the movement of wholesale electricity in all or parts of 13 states and the District of Columbia. The company's mission is to ensure the reliability of the power grid and to facilitate the wholesale electricity market. PJM Interconnection operates the largest power grid in North America, serving over 65 million people. The company was founded in 1927 and is headquartered in Audubon, Pennsylvania.