There is no definitive position on the return of daylight saving time in the 2025/2026 cycle. In response to a question from Canal Solar, the MME (Ministry of Mines and Energy) informed that the topic “is permanently evaluated by the Ministry”.
The justification presented is that the reservoirs are in a favorable situation, evolving within normal limits throughout the dry period, which places the SIN (National Interconnected System) in better conditions than last year.
Daylight saving time was last adopted in Brazilian territory between November 4, 2018 and February 17, 2019.
The ONS (National Electric System Operator) reinforced the scenario reported by the MME in projections presented on September 10 to the CMSE (Electric Sector Monitoring Committee).
According to the operator, energy supply to the country is guaranteed until February 2026, with storage levels higher than those of 2024. In August, the SIN closed with 62% storage, 58% in the Southeast/Central-West, 90% in the South, 60% in the Northeast and 88% in the North.
Even so, at that time, the ONS warned of uncertainties at the start of the next wet season, predicting the need for additional measures to face challenging scenarios, such as delays in the rainy season.
These include the use of complementary thermal generation, maximizing production from Itaipu and the São Francisco River, and preserving water reserves by reducing flows at plants such as Belo Monte, Jupiá, and Porto Primavera.
ONS reinforces the need for the return of daylight saving time in Brazil
Below average inflows
Expected inflows between September 2025 and February 2026 are expected to be below the Long Term Average (LTA), ranging between 66% and 98% of the historical average.
In the most pessimistic scenario, reservoirs in the Southeast/Central-West would end February 2026 with 21,6 percentage points less than in the same month of 2025. In the optimistic scenario, however, they would be 2,5 percentage points higher.
To the Press, both the ONS and the ANEEL (National Electric Energy Agency), indicated that the decision on the adoption of daylight saving time is a matter for the MME.
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