Brazil Publishes Rules for First Battery Capacity Auctions, Prompting Factory Investments

Overview

• The Ministry of Mines and Energy formalized Portaria Normativa nº 136/2026 to hold two battery capacity auctions in December, one reserved for projects meeting BNDES local-content rules and one open to all suppliers.
• Winners will receive 15-year capacity reservation contracts with supply beginning August 1, 2028, and batteries must deliver contracted power for four consecutive hours per cycle and up to two cycles per day while ONS may dispatch systems for up to 12 hours.
• The auction rules immediately catalyzed industry moves: WEG and Anodox have secured BNDES financing to build factories in Itajaí (expected end-2027, up to 2 GWh) and Ceará (target 2028, up to 2 GWh), and BYD has announced a possible phased R$ 500 million investment tied to regulatory clarity.
• Analysts and sector groups say auctions will help reduce the large recent curtailment of wind and solar—reported at roughly 3 GW average in 2026 and over 20% of available renewables wasted in 2025—but they warn batteries only store generated energy and cannot replace firm generation.
• The market impact will depend on auction design, pricing signals and supply-chain steps to localize cells that are currently imported from China, with industry estimates of about R$ 8 billion in potential investment and government credit lines from BNDES supporting scaling.