This session will explore how utility-scale battery energy storage systems can contribute to the security, flexibility, and efficiency of Brazil's Interconnected Power System. The panel will address the role of BESS in system expansion planning, capacity auctions, ancillary services, and the integration of variable renewable energy sources. The discussion will bring together perspectives from policymakers, energy planners, and market participants, focusing on the regulatory and commercial challenges involved in deploying large-scale storage projects in Brazil.