The weekend ended without the need for generation cuts at power plants connected to distribution networks, despite the possibility of activating the Energy Surplus Management Plan.
O This scenario had been signaled by the ONS. (National Electric System Operator) on Friday (28), when the entity classified the probability of activating the plan on Sunday (30) as “medium”.
The assessment was related to the expectation of low load on the SIN (National Interconnected System), a situation that can cause an excess of generation in relation to energy consumption. During these periods, the ONS (National System Operator) initially acts on the GC (Centralized Generation), reducing the production of power plants under its control.
If these measures are not sufficient to balance generation and load, the Surplus Management Plan foresees the possibility of restrictions also in power plants connected to distribution networks.
However, the imbalance that could lead to the need for further cuts did not materialize over the weekend.
During the operation scheduled for Saturday (29), the ONS technical teams verified that the expected conditions for the SIN would allow the operation to be maintained within safety parameters, without the need to proceed with cuts in the distribution networks.
Therefore, there was no need to activate the Surplus Management Plan on Sunday (30).
Understand how the Surplus Management Plan works.
The ONS Surplus Management Plan establishes a sequence of measures to deal with periods in which available energy generation exceeds the load on the electrical system.
Before any intervention in the distribution networks, the ONS (National System Operator) uses the resources available in the GC (Generation Control), including reducing the production of large solar and wind power plants connected to the transmission system.
Only when these measures are insufficient to restore the balance between generation and consumption does the plan foresee actions involving the distributors.
At this stage, the ONS (National System Operator) notifies the concessionaires so that they are prepared to reduce, if necessary, the generation connected to the local grids.
Among the projects that may be affected are the so-called Type 3 Power Plants, facilities that are not directly dispatched by the ONS (National System Operator) and whose generation reduction depends on the actions of the distributors.
Therefore, cuts in the distribution network are only used after all available measures on resources directly coordinated by the Operator have been exhausted.
Type III Power Plants vs. Distributed Mills: Understand the differences and the ONS cuts.
The plan has already been activated twice in 2026.
In 2026, the ONS (National System Operator) had to resort to generation cuts at power plants connected to distribution networks on two occasions. The first one occurred on June 7th., during a period of low load on the SIN (National Interconnected System) that required additional measures to maintain the balance between generation and consumption.
O The second activation occurred on August 23.During the period when the Surplus Management Plan was in effect from 11:00 AM to 1:30 PM, the reductions made to generation resources under the direct control of the ONS (National System Operator) were insufficient to restore the system's balance, leading the Operator to request additional reductions.
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