Power generation relies on various forms of energy storage, including chemical batteries, pumped hydroelectric storage, and compressed air energy storage. . What energy storage does power generation rely on? 1. Chemical. . An energy storage system (ESS) for electricity generation uses electricity (or some other energy source, such as solar-thermal energy) to charge an energy storage system or device, which is discharged to supply (generate) electricity when needed at desired levels and quality. The first battery, Volta's cell, was developed in 1800. These systems play a critical role in enhancing grid flexibility, improving reliability and supporting the. . Energy storage allows energy to be saved for use at a later time. It helps maintain the balance between energy supply and demand, which can vary hourly, seasonally, and by location.