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Brazil Publishes Rules for First National Battery Auction as Grid Regulator Approves Initial Storage Tariffing

The government says large contracted capacity and new battery procurement will shore up supply and support local industry under a two‑round December auction.

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Overview

  • The Ministry of Mines and Energy published a portaria on Wednesday that sets the first nationwide battery storage auction for December 2 and 4, 2026 with separate rounds for projects meeting BNDES national‑content criteria and for open competition.
  • Aneel approved initial regulation that avoids 'double charging' for batteries fully dispatched by the ONS by charging network tariffs only on discharge while leaving autonomous batteries subject to charges on both charge and discharge.
  • The portaria requires new battery projects to meet minimum technical rules including at least 30 MW capacity, four hours continuous duration, 85% round‑trip efficiency, 15‑year CRCAP contracts and a supply start date of August 1, 2028.
  • The battery auction sits alongside other near‑term procurements: Aneel scheduled a July 3 transmission auction for four lots returned by MEZ Energia with a June 23 registration deadline and MME set three 'existing energy' auctions for November 13 to contract built plants for 2027–2030 deliveries.
  • The March LRCAP that contracted about 19.5 GW of availability remains contested by Congress, TCU, MPF and industry groups who say it favored thermal plants and raised costs while MME and ONS argue additional contracts including batteries are needed to protect supply and legal certainty.