During times of low electricity demand, such as at night or on weekends, excess energy is used to pump water to an upper reservoir. The turbine acts as a pump, moving water back uphill. A pumped–storage plant works much like a conventional hydroelectric station, except the same water can be used over and over again.
Then, what are the advantages of a pumped storage hydroelectric power station?
Thus pumped storage plants have the advantages of generating electricity at lower cost compared to other peak load plants (gas and diesel power plants). Water is pumped back to the reservoir during off-peak loads (eg: during night times). Therefore the cost required to pump back is cheaper.
How is hydropower stored for later use?
This is called hydroelectric power or hydropower. The most common type of hydroelectric power plant uses a dam on a river to store water in a reservoir. Water released from the reservoir flows through a turbine, spinning it, which in turn activates a generator to produce electricity.
How does a pumped storage hydroelectric system store energy for future use?
In a hydroelectric power station water is stored behind a dam in a reservoir. This water has gravitational potential energy. At pumped storage hydroelectric stations water is pumped back into the reservoir when there are periods of low power demand.