PJM Interconnection | 40,164 followers on LinkedIn. Working to perfect the flow of energy for 67 million people in 13 states and the District of Columbia. | PJM Interconnection manages the high-voltage electric system that provides power to 67 million people in all or parts of 13 states and the District of Columbia. It's the largest power grid in North America. As a neutral, independent party, PJM administers a competitive wholesale electricity market.