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Home / News / ONS indicates that SIN load should increase by up to 4% in December.

ONS indicates that SIN load should increase by up to 4% in December.

PMO report highlights North, South and Northeast subsystems as drivers of load expansion.
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  • Photo by Caique Amorim Caique Amorim
  • December 15, 2025, at 15:30 AM
1 min 54 sec read
Photo: Freepik

Rising temperatures in several regions of Brazil throughout December are driving a projected 4% increase in total load on the SIN (National Interconnected System).

The PMO (Monthly Operation Program) bulletin indicates that, between December 13th and 19th, the load on the SIN (National Interconnected System) should reach 83.206 MWmed, with the North, South, and Northeast subsystems showing significant variations.

The North of the country is expected to register the greatest growth, with an estimated increase of 11,1% in load, reaching 8.731 MWmed, followed by the South, with an expansion of 9%, corresponding to 14.575 MWmed, and the Northeast, with a growth of 3,2%, totaling 14.019 MWmed.

The Southeast/Central-West region, in turn, is expected to register a more modest increase of 1,5%, totaling 45.880 MWmed.

Energy load in the SIN (National Interconnected System) falls 1,5% in September, says ONS (National System Operator).

According to Márcio Rea, general director of ONS (National System Operator), variations in energy load growth reflect the country's climatic conditions, and he explained that temperatures are within the normal range or slightly above average for the period, which naturally increases energy demand.

Rea also said that these conditions are typical for this time of year and that the ONS (National System Operator) has the necessary resources to ensure a more efficient energy supply.

In terms of ENA (Affluent Natural Energy)Forecasts for the coming days indicate that inflows will be above 80% of the Long-Term Average in the South (82%) and Southeast/Central-West (81%) subsystems.

In the North, the projection is for 79% of the MLT (Long-Term Average), while in the Northeast, inflows are expected to be at 41% of the MLT, which may affect generation at some hydroelectric plants in the region.

A EAR (Stored Energy) It also presents forecasts for the end of December, with estimated levels of 68% in the South and 55,2% in the North. In the Southeast/Central-West, the forecast is 45,3%, and in the Northeast, 47%.

Furthermore, the CMO (Marginal Operating Cost)The cost of generating energy to be operated in order to balance supply and demand is projected at R$ 300,87 for all subsystems. This value reflects the system's operation under current load and generation conditions.

all the content of Canal Solar is protected by copyright law, and partial or total reproduction of this site in any medium is expressly prohibited. If you are interested in collaborating or reusing part of our material, please contact us by email: redacao@canalsolar.com.br.

Free Market Course National System Operator power load forecast SIN (National Interconnected System)
Photo by Caique Amorim
Caique Amorim
Journalism student at the Pontifical Catholic University of Campinas. I have experience in producing journalistic material.
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