Pumped storage moves water to a higher reservoir while electricity demand is low. Releasing the water later provides extra generation during a short surge in consumption. Television breaks create the everyday example, as many households switch on their kettles at once. The stored water gives the electricity system a way to respond to those brief peaks.
Notable Point · 1:03:03-1:04:19
Pumped storage and sudden electricity demand
Pumping water uphill during quiet periods provides a response to short surges in electricity demand.