Brazil has regulated battery energy storage and set out a path to procure these systems: two auctions with 15-year contracts. The news, published by Greener on June 11, 2026, reflects a response to a problem that marked the start of the year. The country has one of the largest renewable fleets in the world, but the power system is finding it increasingly difficult to maintain operational flexibility as solar and wind generation grow.
The mismatch that prompted the regulation
According to the analysis, Brazil entered 2026 with an imbalance. The supply of clean energy grew substantially, but the ability to match generation to consumption, hour by hour, did not keep pace. This is a well-known effect of expanding variable sources. The sun and the wind do not produce when the operator needs them, but when the natural resource is available.
In practice, this creates periods of surplus energy during part of the day and tight supply at other times. Without tools to shift this energy over time, the system must rely on other flexibility solutions or waste renewable generation. This is where battery energy storage systems, known by the acronym BESS (Battery Energy Storage Systems), become important.
What BESS are and why they matter to the system
A BESS is a set of batteries, inverters, control systems and connection equipment. It absorbs energy from the grid or from a power plant and returns it later. In general, these systems can:
- store surplus solar and wind generation for use during periods of higher demand;
- respond within seconds to grid fluctuations, helping to maintain stability;
- provide available capacity when the operator needs reserves;
- reduce the need to curtail renewable generation during periods of surplus.
For this reason, storage regulation is seen as a missing piece to ensure that the expansion of renewables in Brazil comes with greater operational security and flexibility.
Two auctions and long-term contracts
The core of the regulation is the provision for two auctions to procure storage, with 15-year contract terms. In a regulated auction, the government defines the product it wants to buy and developers compete for the right to supply it, usually at the lowest price. Winners sign a long-term contract with defined revenue.
For battery projects, the contract term carries a lot of weight. These are investments that require substantial upfront capital. Without a stable revenue source, it is hard to convince banks and investors. A 15-year horizon gives the project a base of contracted revenue on which a financing structure can be built.
What changes in practice for the BESS market
The most direct effect is revenue predictability. It makes it possible to finance storage projects and sign battery supply agreements in Brazil. For each link in the chain, this translates in different ways:
- Developers: now have a concrete procurement path. It makes sense to move ahead with site selection, grid connection studies, permitting and financial modeling in order to reach the auctions with mature projects.
- EPCs: can prepare for a pipeline of works with schedules tied to the contracts. They will need to build teams and processes to integrate batteries, power conversion and substations.
- Battery and equipment manufacturers: with long-term contracts, longer supply agreements become viable. This includes performance guarantees and operation and maintenance services that span the life of the contract.
- Suppliers and service providers: integrators, consultancies and maintenance companies are likely to be brought in earlier, as early as the project structuring phase.
The details of each auction will determine who is able to compete. Even so, the message of the regulation is clear: battery storage is no longer a bet and now has a formal place in the planning of the Brazilian power system. Those who prepare in advance will have an advantage when the auctions take place.
Original source: Greener — Dois leilões, 15 anos de contrato: Brasil regulamenta o armazenamento em baterias