generate questions: Pumped-storage hydroelectricity stores energy in the form of water pumped when energy is available from a lower elevation reservoir to a higher elevation one. The energy is recovered when demand is high by releasing the water, with the pump becoming a hydroelectric power generator.
When water is released due to high demand, the pump become swhat? {sep_token} Pumped-storage hydroelectricity stores energy in what form? {sep_token} How is the energy stored by pumped-storage hydroelectricity recovered? {sep_token}