PJM Interconnection
Electric grid coordinator in the northeastern US
PJM Interconnection
PJM Interconnection LLC (PJM) is a regional transmission organization (RTO) in the United States. It 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 is the largest power grid operator in the United States, serving 67 million customers from Chicago to New Jersey. PJM, headquartered in Valley Forge, Pennsylvania, was the world's largest competitive wholesale electricity market until the development of the European Integrated Energy Market in the 2000s. More than 1,000 companies are members of PJM, which has 182 gigawatts of generating capacity. With 1,436 electric power generators and 88,333 miles (142,158 km) of transmission lines, PJM delivered over 800 terawatt-hours of electricity in 2024. Started in 1927, the pool was renamed the Pennsylvania-New Jersey...
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