Muddy Run is a pumped storage hydroelectric facility located in Drumore, Pennsylvania, within the ReliabilityFirst Corporation NERC region. The plant boasts an operating capacity of 1,070 megawatts and is integrated into the PJM Interconnection power control area. Operated by Constellation Power, Muddy Run is classified as an unregulated facility, with Constellation Energy Corporation serving as both the majority owner and the holding company. Utilizing water as its primary fuel source, Muddy Run plays a critical role in energy storage and grid stability, contributing to the overall reliability of the regional power supply.