An Energy Storage System (ESS) is a technology that captures and stores energy for later use. It helps balance supply and demand by storing excess energy generated during low-demand periods and releasing it during high-demand times. Common types of energy storage include batteries, pumped hydro storage, and flywheels. ESS plays a crucial role in integrating renewable energy sources like solar power and wind energy into the grid. By providing backup power and stabilizing voltage, these systems enhance the reliability and efficiency of the energy supply, making it easier to transition to a more sustainable energy future.