CentralNotice From Wikipedia, the free encyclopedia Jump to navigation Jump to search Type of electric energy storage system using two reservoirs of water connected with a pump and a turbine "Hydro-storage" redirects here. For storage of water for other purposes, see Reservoir . Diagram of the TVA pumped storage facility at Raccoon Mountain Pumped-Storage Plant in Tennessee, United States Shaded-relief topo map of the Taum Sauk pumped storage plant in Missouri, United States. The lake on the mountain is built upon a flat surface, requiring a dam around the entire perimeter. Pumped-storage hydroelectricity ( PSH ), or pumped hydroelectric energy storage ( PHES ), is a type of hydroelectric energy storage used by electric power systems for load balancing . The method stores energy in the form of gravitational potential energy of water, pumped from a lower elevation...