Did you know pumped hydroelectric storage systems generate electricity by pumping water from a low to a high reservoir, releasing the water from the higher reservoir through a hydroelectric turbine only when electricity is needed?

94% of U.S. energy storage is from pumped hydroelectric storage systems, equating to 23.6 GW as of June 2018.

PHS plants have long lifetimes (50-60 years) and operate at 76-85% efficiency.