The Langenprozelten Pumped Storage Station is a pumped storage power station near Gemünden am Main at the Main in the under-Frankish district Main Spessart (Bavaria), which went in service in 1976. The hydro-electric power plant has an output of . It uses two Francis turbines. The reservoirs are connected by pipes. The maximum head is . The upper reservoir has a capacity of approximately . The maximum energy store ability amounts to .
The station produces traction current only and is an important peak load power station in the traction network for railways.
The lower reservoir, situated at , is fed by a creek, which is mostly dry in the summer. Therefore, if necessary, water is pumped from a further retention basin, which is situated below the lower reservoir. Both dams (of upper and lower reservoir) are rock fill embankment dams with an asphaltic concrete external sealing.