The energy load of the SIN (National Interconnected System) closed September 2025 at 80.022 MWmed, a 1,5% decrease compared to the previous year, according to the ONS (National System Operator). Despite the monthly decline, the accumulated total for the last 12 months showed an increase of 1,7%, maintaining a positive trajectory in the long term.
Uneven performance across subsystems marked the month. The North (+4,6%) and Northeast (+2,2%) regions experienced load expansion, while the Southeast/Central-West (-3,9%) and South (-0,5%) regions saw declines. Over the past 12 months, all regions showed growth, with the North standing out (+6%).
According to the ONS (National System Operator), climatic factors directly influenced the result. Temperatures near or below the historical average in capitals of the Southeast/Central-West and North regions, in addition to above-average rainfall in the south-central Amazon, reduced consumption in heat-sensitive segments. The September 7th holiday also impacted demand behavior.
"Anti-true factors had a -0,9 percentage point impact on the SIN load performance in September," it reported. ONS.
Performance by region
The 3,9% drop in the Southeast/Central-West region was the most intense among the subsystems, influenced by the reduction in temperature and less use of refrigeration equipment. In the South, the contraction was slight (-0,5%), with a moderate effect from cold fronts during the period.
In the Northeast, the 2,2% increase reflected higher temperatures across much of the region, while the North maintained strong expansion, sustained by structural growth in consumption.
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