In the United States, cumulative utility-scale battery storage capacity exceeded 26 gigawatts (GW) in 2024, according to our January 2025 Preliminary Monthly Electric Generator Inventory. . Electrical Energy Storage (EES) systems store electricity and convert it back to electrical energy when needed. The first battery, Volta's cell, was developed in 1800. 4 GW of new battery storage capacity in 2024, the second-largest generating capacity. . Home batteries store electricity from your solar system or the grid for use during outages, when the grid is most expensive, or at night when it is dark. A well-sized system can keep essential appliances running, lower your utility bill and protect you from grid disruptions.
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