The SIN (National Interconnected System) once again faced a situation on Sunday (23) in which the supply of energy exceeded the space available to accommodate it in the face of insufficient demand.
To preserve operational balance, the ONS (National Electric System Operator) has once again resorted to the Energy Surplus Management Plan in the Distribution Network, an emergency mechanism used for the second time this year.
The first operation took place on June 7th, when it was also necessary to resort to the plan to reduce generation connected to distribution networks.
The activation occurred after the operator had already adopted measures to reduce generation from the plants under its control. As these actions were not sufficient to reconcile production and load, it was necessary to move towards restrictions on sources connected to the distribution networks, which are not directly controlled by the ONS (National System Operator).
Low load
The incident occurred once again on a Sunday, a time when electricity consumption tends to be lower. At the same time, micro and mini-distributed generation remains significant during the day, exacerbating the mismatch between available energy and the demand to be met by the system.
The ONS had previously warned distribution agents to prepare to implement generation reductions for the assets under their responsibility.
In parallel, the operator also implemented complementary measures to reduce production from sources that it can dispatch directly to the SIN (National Interconnected System).
Mechanism
The Surplus Management Plan functions as a step following interventions on centralized generation. The logic is to first reduce the resources that are under the operational control of the ONS (National System Operator) and, if the excess persists, determine cuts in production connected to distribution networks to restore compatibility between generation and consumption.
The plan, approved by ANEEL (National Electric Energy Agency) in 2025, was designed precisely for situations in which previous operational alternatives are no longer sufficient to absorb the surplus energy.
In the case of distributed sources, its implementation depends on coordinated action between the ONS (National System Operator) and the distributors responsible for the assets affected by the restrictions.
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