On December 2 and 4, Brazil holds its first capacity reserve auctions dedicated exclusively to battery energy storage systems, known as BESS. For these auctions, the Energy Research Company (EPE) received registrations for 6,091 projects, with a combined capacity of 296.8 GW. The volume shows strong appetite from developers, but it coexists with a question that still lacks a complete answer: how far current rules ensure predictable revenues for these projects over their useful life.
A milestone for storage in the country
Until now, battery storage appeared in Brazil's power sector mainly in specific applications, paired with renewable plants or particular consumers. Auctions exclusive to the technology change the scale of the conversation. For the first time, batteries compete in their own nationwide procurement mechanism, without competing side by side with thermal plants or other sources.
It is worth recalling what a capacity reserve auction, often called LRCAP, is. In this type of auction, the system does not buy energy as such, but power availability: the developer is paid to keep its assets ready to serve the system when needed, such as during peak demand hours or when solar and wind generation drops. For batteries, which charge during periods of surplus and discharge when the grid needs it, this design aligns directly with the technology's technical strengths.
Intense competition and striking numbers
The total registered is the most telling figure at this stage. Thousands of projects and nearly three hundred gigawatts indicate that investors, developers and suppliers see storage as a relevant business front in Brazil. At the same time, the size of the registration foreshadows a very fierce competition.
Registration, however, is not procurement. Registration with EPE is a technical qualification step, and the sector's auction experience shows that only a fraction of what is registered ends up actually contracted. In practice, this means most registered projects will not win, and the offered price tends to be the deciding factor among technically qualified bids.
- Auction dates: December 2 and 4.
- Projects registered with EPE: 6,091.
- Total registered capacity: 296.8 GW.
- Open issue: revenue predictability under current regulation.
Regulation has advanced, but revenue still raises doubts
Holding the auctions is in itself a sign of regulatory progress: there is a formal procurement instrument for batteries. Even so, according to the report, the current framework leaves questions about the stability of these projects' revenues. For assets with high upfront investment, such as BESS, this predictability directly affects financing costs and the viability of bids.
In general terms, a storage system's revenue can come from more than one source: payment for contracted capacity, potential gains from the price difference between charging and discharging, and services provided to the grid. The less clarity there is about each of these components and the rules that underpin them, the greater the risk margin the developer must build into the price, or the greater the risk of bidding a value that later proves unsustainable.
What this means in the Northeast
In an auction with such demand, the grid connection point is one of the most concrete filters for a project's competitiveness. A survey by ENLACE of eligible substations in the Northeast, based on an ONS technical note on connection margin, identified 14 substations in Bahia, 10 in Ceará and 6 in Piauí with a margin of 500 MW or more. These are points with significant room to receive large projects, which tends to concentrate the interest of bidders.
This does not mean the margin is guaranteed for all interested parties: with many projects targeting the same points, available capacity can run out quickly. For those developing in the region, choosing the right substation and understanding how many competitors are vying for the same space becomes as important as the bid price.
Our take
In our assessment, the main signal from this news is market maturity: battery storage is no longer a pilot-project topic and now has its own procurement channel in Brazil. The registered volume confirms there is capital and interest willing to enter. We see this as positive for the chain as a whole, because auctions create price and timeline benchmarks that help structure the market in the following years.
What remains undefined is precisely what weighs most on the wallet: revenue predictability. Very intense competition, combined with rules that still leave doubts, creates the risk of overly aggressive bids that later struggle with financing or execution. This is not a prediction that it will happen, but a recognition that the balance between competitive pricing and well-priced risk is the most delicate point of this round.
In the coming weeks, it is worth following the auctions on December 2 and 4, the number of projects actually contracted relative to the total registered, and the resulting prices. We will also follow any regulatory clarifications on battery revenue sources, which may influence both this round and future ones.
What changes in practice for the BESS chain
For developers, the moment calls for lean, well-founded bids, with conservative revenue assumptions and a clear plan for scenarios in which regulation evolves differently than expected. The quality of the connection point and project maturity make a difference in a contest with thousands of competitors.
For EPCs, the auction results will indicate the actual volume of construction to be contracted, and price pressure should be reflected in deployment budgets. For manufacturers and suppliers, the competition tends to demand competitive commercial terms and solid technical guarantees, since the developer will need to demonstrate availability throughout the entire contract. Across all links, the recommendation is the same: plan cautiously, because registration is broad, but procurement will be selective.
Original source: Greener — Armazenamento avança na regulação e ainda busca previsibilidade de receita
Julio Martinez