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Home / News / Politics & Regulation / ONS confirms it has already structured the technical basis for the battery auction, which is still awaiting approval from the MME (Ministry of Mines and Energy).

ONS confirms it has already structured the technical basis for the battery auction, which is still awaiting approval from the MME (Ministry of Mines and Energy).

Information was released by representatives of the Operator itself during WEG EPC Day 2026.
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  • Photo by Henrique Hein Henrique Hein
  • May 27, 2026, at 17:41 PM
1 min 53 sec read
Canal Solar - ONS confirms it has already structured the technical basis for the battery auction, which is still awaiting approval from the Ministry of Mines and Energy.
WEG EPC Day 2026 was held in São Paulo (SP) this Wednesday (27). Photo: Canal Solar

With the collaboration of Ericka Araújo

The ONS (National Electric System Operator) already has a relatively mature technical basis for integrating battery storage systems into the SIN (National Interconnected System), but the definitive advancement of the capacity auction still depends on the publication of the MME (Ministry of Mines and Energy) ordinance.

As informações foram apresentadas durante o WEG EPC Day 2026 por André Albuquerque, responsável pela gerência Sul do ONS, e Leonardo Costa dos Santos, engenheiro eletricista do Operador. O evento, realizado nesta quarta-feira (27), em São Paulo (SP), contou com cobertura do Canal Solar.

De acordo com os profissionais, o Operador já vem trabalhando há meses em critérios técnicos e requisitos mínimos de desempenho para sistemas de armazenamento.

Segundo eles, boa parte da visão atual do ONS está baseada em documentos técnicos e discussões públicas realizadas ao longo do último ano, incluindo contribuições apresentadas na consulta pública conduzida pelo MME.

Albuquerque e Costa dos Santos explicaram ainda que a visão atual do Operador representa uma espécie de “fotografia” regulatória do momento e que a expectativa é de poucas mudanças até a publicação da portaria do MME.

Os profissionais afirmaram também que o ONS já possui uma base de requisitos mínimos de desempenho para sistemas de armazenamento, especialmente voltados à comprovação da capacidade de operação em grid forming.

These requirements have already appeared in previous technical documents, such as the ONS/EPE Technical Note No. 111/2025, que trouxe testes específicos para validar se os equipamentos realmente possuem essa capacidade operacional.

A homologação dos sistemas, nesse sentido, deve seguir uma lógica semelhante à utilizada atualmente para usinas eólicas e fotovoltaicas, incluindo etapas de validação de modelos matemáticos, testes de comissionamento e verificação em campo.

Albuquerque e Costa dos Santos reforçaram, contudo, que a regulamentação ainda está em amadurecimento, inclusive nas discussões conduzidas pela ANEEL (National Electric Energy Agency).

Apesar disso, a tendência é que o processo para baterias siga uma lógica próxima à já aplicada na integração de empreendimentos eólicos e solares ao sistema elétrico.

all the content of Canal Solar is protected by copyright law, and partial or total reproduction of this site in any medium is expressly prohibited. If you are interested in collaborating or reusing part of our material, please contact us by email: redacao@canalsolar.com.br.

energy storage storage course battery auction MME (Ministry of Mines and Energy) ONS (National Electric System Operator)
Photo by Henrique Hein
Henrique Hein
He worked at Correio Popular and Rádio Trianon. He has experience in podcast production, radio programs, interviews and reporting. Has been following the solar sector since 2020.
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ANEELDecree No. 1000/2021 recognizes the need for systemic impact studies for the connection of distributed generation. However, the regulator itself has also explicitly recognized: Systems without export; Control of injected power; Dynamic limiting mechanisms; “Zero grid” operation. In other words, the Brazilian regulatory framework already allows modern systems to operate without causing the impacts traditionally associated with conventional distributed generation. This point is crucial. CPFL itself officially recognizes zero-grid systems. The discussion becomes even more relevant when one analyzes the distributor's own technical documentation. GED DIST-19397-2025 explicitly recognizes: Hybrid systems; Storage systems; Export control; Energy arbitrage; Islanded operation; Zero-grid functionalities. The standard explicitly states that "such arrangements must not allow the injection of active power into the distributor's electrical grid; that is, they must supply the local load and have zero-grid functionality." This section has enormous technical and regulatory relevance. It demonstrates that: The technology is recognized; The operational concept exists; The distributor formally acknowledges its functionality. Moreover, GED states: "hybrid systems have become an excellent solution for integrating MMGDs" and adds: "mainly with the aim of avoiding flow reversal." This is perhaps one of the most important points in the entire discussion. The distributor's own technical standard officially recognizes that batteries, EMS, export control, and hybrid systems can function precisely as mitigating mechanisms for the main basis currently used for denying access: flow reversal. The technical paradox: Here arises an extremely relevant regulatory paradox. 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Perhaps the most sensitive point of the discussion lies in the analysis methodology currently used. The CPFL's "Instruction Manual for Estimated and Connection Budget Analysis for Micro and Mini Distributed Generation Systems" describes in detail: Power flow studies; Load modeling; Generation curve modeling; Flow reversal analysis criteria. The document makes it clear that the studies use: Typical curves; Statistical averages; Presumed generation; Standardized consumption and generation profiles. The methodology considers: Average curves; Historical profiles; Statistical modeling; Aggregate consumer behavior. This is perfectly normal in electrical engineering. The problem arises when this same methodology is used to evaluate intelligent hybrid systems with dynamic behavior. Intelligent systems being analyzed as passive generation. The manual itself barely goes into detail about: Dynamic EMS modeling; Instantaneous export control; Intelligent battery dispatch; Transient behavior of SAEs; Operational logic of "zero export". In practice, this raises an extremely relevant technical hypothesis: the studies currently being used may still be modeling modern hybrid systems as if they were conventional passive photovoltaic generation. This distinction is enormous. Because a system with EMS, battery, millisecond response, dynamic control, and instantaneous export limitation does not behave equivalently to a conventional photovoltaic system. This is perhaps the main technical discussion in the Brazilian distributed electricity sector today. The requirement for approvals without a clear public procedure. Another critical point is the increasing number of reported requirements related to the certification of: EMS; Hybrid inverters; “Zero export” systems; Export controllers. 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