Pumped-storage hydroelectricity – wikipedia, 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 reservoir to a higher elevation. low-cost surplus off-peak electric power is typically used to run the pumps..
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