In one line
Stationary battery system providing grid-scale or behind-the-meter energy storage and grid services.
What it means
A Battery Energy Storage System (BESS) is a stationary battery installation, typically at MW–GW scale, used for grid services. Common applications: energy arbitrage (charge off-peak, discharge on-peak), frequency regulation, capacity (resource adequacy), grid-forming services, and behind-the-meter peak shaving. LFP is the dominant chemistry for stationary BESS in 2026.
Related terms
Browse every term in the renewable energy glossary, or read the latest analysis on Battery storage.