Context: 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.

Question: When water is released due to high demand, the pump become swhat?
Answer: a hydroelectric power generator

Question: Pumped-storage hydroelectricity stores energy in what form?
Answer: water pumped when energy is available from a lower elevation reservoir to a higher elevation one

Question: How is the energy stored by pumped-storage hydroelectricity recovered?
Answer: by releasing the water, with the pump becoming a hydroelectric power generator