Launched in July 2024, the ONS (National System Operator) updated the Margin for Generation Flow, a tool that presents indicative results of the remaining capacity of the SIN (National Interconnected System) for new energy generation projects covering the 2025-2029 cycle.
The is updated every four months and aims to facilitate the planning of new generation projects in Brazil.
This edition includes:
- New network usage contracts (CUST) signed by March 24, 2025;
- Adjustments to busbars (electrical grid points) that, even without new contracts, were directly impacted by CUST signed in electrically close areas;
- Specific reviews in Bahia, after the inclusion in the Grant Plan of two important network reinforcement works, which have already been authorized: the reconduction (replacement of the conductor cables to increase capacity) of the 230 kV transmission lines between Sapeaçu and Santo Antônio de Jesus and between Itapebi and Eunápolis.
Furthermore, dams that have received, since the last publication of the , access opinions indicating the unfeasibility of flow have now presented zero margin, reflecting the real situation of the network.
Another new feature is that the now also shows the MUST (Transmission System Usage Amounts) values contained in the GPA (Access Opinion Guarantee) maintenance queue for the evaluated buses.
The data reflects the situation in effect on March 31, 2025, allowing an overview of the demand for grid connection. According to the ONS, the data presented are for informational purposes only and do not replace the formal processes for requesting access to the transmission network, nor the official publications of the SIN's outflow capacity aimed at ACR (Regulated Contracting Environment) auctions.
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