Last Friday (1}, the MME (Ministry of Mines and Energy) published the Ordinance no. 88 / 2024, which establishes guidelines for the differentiated operation of thermoelectric plants, aiming to meet the power requirements in the SIN (National Interconnected System).
The measure grants the ONS (National System Operator) greater flexibility to operate the system during peak hours. The ordinance is valid until March 31, 2025, when the wet season ends.
“The operation of thermoelectric plants under different conditions aims to provide additional resources to the ONS, contributing to the security and guarantee of the national electricity supply, while minimizing the total cost of operating the SIN”, explains the ministry.
The “differentiated operation” refers to thermoelectric plants operating with parameters different from those declared in the energy optimization and price formation process.
For example, consider a combined cycle thermoelectric plant that takes 6 hours to reach maximum generation and another 4 hours to shut down, with a CVU (Variable Unit Cost) of R$220/MWh. Thus, the ONS would pay the CVU for 10 hours, between activation and shutdown.
If the agent changes to an open cycle, reducing this ramp time to 5 hours, with a CVU of R$ 240/MWh, the ONS may consider this operation more advantageous, even with the higher unit cost, as it better meets the system's demand.
Thermoelectric agents that are in compliance with sectoral obligations, including with the CCEE (Electric Energy Trading Chamber), and whose plants can operate under special conditions may participate. Interested parties may submit price offers to the ONS, in R$/MWh, and quantity of power product.
It will be up to the ONS to define the products to be contracted and their delivery commitments, considering the systemic needs for activating resources the day before dispatch (D-1) and in real time (D), as well as the deadlines and conditions for receiving offers.
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