[[Battery Energy Storage Systems]] (BESS) are critical components of modern electricity grids, using electrochemical batteries to store electrical energy and release it when needed.

Key Applications & Limitations:

• Grid Flexibility: Provide fast-response services like frequency regulation, voltage support, and peak shaving.
• Renewable Integration: Smooth out the intermittency of solar and wind power, enabling higher renewable penetration.
• Duration: Typically provide flexibility for shorter durations (e.g., 2-6 hours), though longer-duration solutions are emerging.
• Brazilian Context: While globally significant, bess are currently less favored than reciprocating-engines in brazil for providing multi-day firming capacity, a specific need driven by hydroelectricity drought risk. reciprocating-engines offer a more cost-effective solution for longer-duration capacity needs under current aneel frameworks.