Most people have assumed that the UK does not have enough feasible pumped-storage potential for a renewable energy revolution to take place.
Energy is stored so that the excess electricity supply from intermittent technologies such as wind and solar can be consumed at different times. Nuclear reactors can operate at full capacity at night when the demand for electricity is low as the energy is stored. For example, around 9% of Japan’s electricity generation capacity is pumped-storage as Japan once relied heavily on nuclear power.
See on theenergycollective.com