Pumped-storage hydroelectricity

Pumped-storage hydroelectricity is a method of storing energy using two reservoirs at different elevations. When electricity demand is low, excess power from the grid is used to pump water from the lower reservoir to the upper one. During periods of high demand, the stored water is released back down through turbines, generating electricity. This process acts like a giant rechargeable battery, balancing supply and demand efficiently. It's a reliable way to store large amounts of energy, especially when integrating renewable sources like wind and solar, which can fluctuate over time.