Energy storage power stations utilize a variety of techniques to store energy for later use. Pumped hydroelectric storage, 2. These systems help balance supply and demand by storing excess electricity from variable renewables such as solar and inflexible sources. . The top energy storage technologies include pumped storage hydroelectricity, lithium-ion batteries, lead-acid batteries and thermal energy storage Electrification, integrating renewables and making grids more reliable are all things the world needs. It is not always the case that the wind blows. They allow excess energy generated during periods of low demand or high renewable output to be stored and released when needed, thereby balancing supply and demand.