Brazil's National Electric System Operator (ONS) made available to the market, in early November 2026, a question-and-answer document dedicated to energy storage systems and the Capacity Reserve Auction (LRCAP). The material brings together clarifications on topics that often raise questions among developers: grid access, connection, operation and qualification of these projects in the National Interconnected System (SIN). The operator itself makes an important caveat: the content is for information purposes only and does not replace the rules in force.
What the ONS published
The document gathers, in a single place, answers to recurring questions from those who intend to bring batteries to the auction. According to the operator's description, the material is structured around four main areas that follow the life cycle of a project:
- Access: how a storage system enters the SIN and which steps the developer must go through with the operator;
- Connection: aspects related to the project's point of connection to the grid and the technical conditions involved;
- Operation: how these assets should behave after entering service, already under ONS coordination;
- Qualification: guidance on the stage in which the project seeks to qualify to participate in the LRCAP.
For a segment that is still taking shape in the country, having a consolidated reference helps reduce the fragmentation of information that is currently scattered across different documents and channels.
A guide, not a rule
The point that deserves the most attention is the nature of the document. The ONS makes it clear that the FAQ has no normative value. In practical terms, this means that no answer contained in it creates, changes or relaxes obligations. In case of any discrepancy between what the FAQ suggests and what the official regulations, procedures and auction notices state, the latter prevail.
This distinction is relevant because, in competitive processes such as an auction, small details of interpretation can determine whether or not a project is qualified. The FAQ works as a guidance map, but the documentation submitted must be anchored in the formal rules.
Why this matters for the battery auction
The LRCAP is the mechanism through which the power sector contracts available capacity to ensure demand is met at the system's most demanding moments. Unlike auctions that contract energy, the focus here is the ability to deliver power whenever the operator needs it. Battery energy storage systems (BESS) fit this role because they can charge during off-peak periods and dispatch energy quickly at critical hours.
For this to work, however, the project needs to resolve issues that go beyond the equipment: where to connect, whether there is connection margin available at the chosen point, that is, whether the grid can handle power injection and withdrawal there, and how the asset will be operated. These are precisely the topics the FAQ seeks to clarify, which makes it a useful input during the structuring phase.
What this means for the Northeast
Since the questions addressed in the document revolve around connection and qualification, connection margin is the data point most directly linked to the topic in the region. According to a survey by ENLACE on Northeastern substations eligible for the auction, 27 substations in Bahia, 24 in Ceará and 15 in Piauí appear in the ONS technical note with available connection margin. This indicates there is physical room on the grid for projects in these states, but also that the choice of connection point will be a decisive competitiveness factor.
In this context, guidance material on access and connection tends to be especially useful for those comparing location alternatives, as it helps anticipate requirements before committing resources to studies and land reservations.
Our take
In our assessment, the publication of the FAQ signals that the operator recognizes the volume of questions storage still raises and seeks to give market participants greater predictability. We see this as a positive step for a market that depends on technical clarity to attract capital and build supply chains. The more standardized the understanding of connection and operation, the lower the risk perceived by financiers tends to be.
At the same time, the non-normative nature of the document calls for caution. An FAQ answers generic questions and may not cover the specific circumstances of each project, such as hybrid configurations or connection points with technical particularities. There is a risk that participants will treat the answers as a guarantee, which they are not. The publication also provides no detail on deadlines or next steps of the auction, which leaves part of the planning open.
In the coming weeks, we recommend following any updates to the FAQ itself and, above all, the evolution of the official LRCAP rules, always checking whether the document's guidance is aligned with what is formalized by the competent institutions.
What changes in practice for the BESS chain
- Developers: now have a single reference to review their access, connection and qualification strategy. It is worth using the FAQ as an initial checklist, but validating each point against the official rules before filing documents.
- EPCs: can use the guidance on connection and operation to align engineering assumptions from the outset, avoiding rework on projects that will need to meet the operator's requirements.
- Manufacturers: the answers on operation help clarify the expected behavior of systems in the SIN, which guides technical specifications and how solutions are presented to customers.
- Suppliers and consultants: gain a common basis for dialogue with developers, useful for preparing proposals and schedules better aligned with the auction stages.
In all cases, the recommendation is the same: treat the document as support for preparation, not as a legal basis. A project's security in the LRCAP still depends on compliance with the formal rules and a careful reading of each requirement.
Original source: ONS — ONS disponibiliza FAQ com orientações sobre Sistemas de Armazenamento de Energia e LRCAP
Paulo Melo