A ANEEL (National Electric Energy Agency) published this Thursday (12) Technical Note No. 03/2026, which complements Technical Note No. 13/2025 and provides new clarifications on the regulation of electricity storage in Brazil.
This document is part of the analysis of the second phase of Public Consultation No. 39/2023, a process that has been defining the regulatory basis for the inclusion of batteries in the electricity sector. The central point is the maintenance of the so-called dual network usage tariff for storage systems — that is, the simultaneous payment of TUST (Transmission System Usage Tariff) for consumption and generation.
The decision comes after the enactment of Law No. 15.269/2025, which formally recognized storage as a separate activity within the sector's regulatory framework. The document does not alter the tariff regime of the new legislation applicable to batteries. Thus, the systems remain subject to charges.
Another relevant point was the definition of who will bear the costs of the batteries contracted as a reserve capacity. Law No. 15.269/2025 established that these systems must be financed exclusively by the generators, and not by the consumers.
In the technical note, the Agency stressed that there should be no distinction between types of generation that will bear this burden. In other words, the cost tends to be distributed among the generating agents, ruling out the possibility of a direct pass-through to the tariffs of end consumers.
click on the here and check out Technical Note No. 03/2026 from ANEEL.
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An answer
A ANEEL The system should only regulate the quality and power injected into the grid, but allow each user to pay for their own batteries for self-consumption, even recognizing their contributions in moderating investments for grid expansion. The "Fio-B" system is a confiscation that penalizes power plants by creating an energy "spread," as if the distributors were banks that pay them less than they charge when lending money.