Reliable Generation for Peak Demand
Muddy Run Pumped Storage Facility is a pumped-storage hydroelectric plant that is owned and operated by Constellation. It is used to generate energy for peak demand, which usually occurs during the morning and early evening hours.
The eight-unit power station provides 1,070 megawatts (MW) of electricity by damming the Muddy Run ravine from its mouth. The station's output is critical to meeting the dynamic peak electricity demands on the area's regional power grid on hot summer afternoons. To generate energy, the water in the upper reservoir at Muddy Run is used to fuel the turbines, flowing into the Conowingo Pond, a 14-mile stretch of the Susquehanna River in Maryland. As energy demand decreases at night, the units are reversed and used as pumps to fill the upper reservoir for subsequent peak-demand periods.
Muddy Run has provided electric power to the regional transmission system since commercial operation began in 1966. At the time, it was the largest pumped-storage hydroelectric power plant in the world. The general plant configuration remains the same as the original construction; however, the turbines and generators have been recently refurbished.