As solar and other renewable energy resources expand across the U.S. power system, storing electricity has become an increasingly important part of how energy is generated, managed, and delivered.<\/p>\n\n\n\n
A battery energy storage system (BESS)<\/strong> allows electricity to be stored when it is available and discharged when it is needed. This capability can help businesses manage energy demand, allow renewable energy projects to shift generation to different times of day, and provide utilities with services that support grid operations.<\/p>\n\n\n\n Battery storage is already expanding rapidly in the United States. According to the U.S. Energy Information Administration (EIA), U.S. utility-scale battery storage reached nearly 52 GW of nameplate capacity by June 2026. That followed average annual expansion of approximately 70% over the previous three years.<\/p>\n\n\n\n Understanding how these systems work, their major components, and their applications can help solar professionals and businesses make better decisions when evaluating energy storage.<\/p>\n\n\n\nTable of Contents<\/h2>