Market design and public policy for Battery Energy Storage System penetration: Case study Brazil.

This article focuses on the challenges and necessary reforms for integrating Battery Energy Storage Systems (BESS) into Brazil’s electricity market. It argues that Brazil’s current centralized, cost-based market design—with limited intraday price volatility and a single-settlement mechanism—is inadequate for economically viable large-scale BESS deployment, primarily due to systemic inefficiencies and the complexity of its hydroelectric-dominated grid. Drawing on California’s bid-based, multi-settlement market managed by the California Independent System Operator (CAISO), which includes nodal pricing and supportive public policies, the article proposes that Brazil adopt a bid-based market with a two-settlement mechanism while maintaining zonal pricing to better fit its hydroelectric context. Additionally, it suggests implementing a virtual reservoir mechanism to address Brazil’s unique water cascade challenges and emphasizes the importance of legal and regulatory reforms to create a transparent, competitive market that properly values BESS services and encourages investment.