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Discussion about the return of daylight saving time in Brazil gained new weight with studies on energy consumption, decline in solar generation in the late afternoon, and pressure on the electrical system during the early evening, a period considered more sensitive by the government.
Daylight saving time remains off the Brazilian calendar, but it has returned to the federal government’s radar due to the pressure on the electrical system in the early evening when energy consumption tends to increase in homes and some businesses.
Until May 2026, there is no official announcement of the return of clock changes. The Ministry of Mines and Energy states that the topic remains under periodic evaluation, mainly due to the increased demand during peak hours and the decline in solar generation in the late afternoon.
The discussion gained momentum on social media after the processing of a proposal in the United States that seeks to maintain daylight saving time permanently. However, the measure has not yet been adopted in the North American country.
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Currently, most of the United States advances clocks in March and returns to standard time in November. In Brazil, the debate is not solely focused on energy savings, as it was in previous decades.
The central point analyzed by the government is whether advancing the clocks could reduce the pressure on the electrical system in the early evening, a period when demand tends to rise in homes and commercial activities.
Daylight saving time in Brazil returns to the government’s radar
The government monitors the balance between electricity supply and consumption in the country. Within this monitoring, one of the observed points is the so-called peak demand, when millions of consumers use electrical equipment simultaneously.
This interval usually occurs in the early evening, with increased use of lighting, showers, air conditioners, televisions, and appliances. At the same time, solar generation loses strength because it depends on natural light.
With the drop in photovoltaic production in the late afternoon, the system needs to compensate for this reduction with other energy sources. The ongoing evaluation considers precisely the relationship between this decline in solar generation and the increase in consumption.
Throughout the day, solar energy helps meet part of the demand. Later, when production decreases and consumption increases, the government analyzes whether an additional hour of daylight could reduce some of the pressure on the system.
Peak energy consumption shifts the focus of the debate
Historically, daylight saving time was used to make better use of natural light during the warmer months. With clocks set forward by one hour, the expectation was to reduce the use of artificial lighting at the end of the day.
This effect has lost relevance over time, according to assessments by the Ministry of Mines and Energy. Studies from 2019 indicated a reduction in the expected benefits due to changes in the population’s consumption habits.
With the advancement of new equipment, the expansion of air conditioning, and changes in urban routines, the highest daily consumption was no longer concentrated only in the evening. Part of the demand also started to occur during the afternoon.
In recent years, the expansion of solar plants and photovoltaic generation systems has added another factor to the debate. The analysis no longer considered only the total volume consumed but also observed the time when energy is demanded.
In 2024, technical evaluations cited by the electricity sector pointed out that the resumption of daylight saving time could reduce the maximum load at certain times and improve the use of renewable sources, such as solar and wind.
The estimate mentioned in sector analyses indicated the possibility of reducing up to 2.9% in the maximum load in some scenarios. This data is used as one of the references in the discussion about the impact of changing the clocks.
States that were affected by daylight saving time
Before the suspension, daylight saving time was mainly applied in the South, Southeast, and Central-West regions. The change affected Rio Grande do Sul, Santa Catarina, Paraná, São Paulo, Rio de Janeiro, Espírito Santo, Minas Gerais, Goiás, Mato Grosso, Mato Grosso do Sul, and the Federal District.
These areas were included because they are farther from the Equator. In these regions, the difference in daylight between summer and winter is more noticeable, especially in the warmer months when the days are longer.
With more natural light in the late afternoon, the expectation was to reduce the need to turn on lighting equipment earlier. This was one of the reasons for the concentrated application in states of the South, Southeast, and Central-West regions.
In the North and Northeast regions, the variation in daylight between seasons is smaller. For this reason, the practical impact of daylight saving time on the use of natural light has always been more limited in these locations.
The geographical difference helps explain why the measure was not adopted throughout the entire national territory. In practice, clocks were set forward by one hour during part of spring and summer.
The change affected the routine of transportation, schools, commerce, services, television programming, flights, and economic activities in general. Therefore, any potential resumption would require planning and prior communication to the impacted sectors.
Why daylight saving time was suspended
Daylight saving time ceased to be adopted in Brazil in 2019. At that time, the justification presented by the government was the loss of effectiveness in reducing electricity consumption.
Studies used in the evaluation indicated that the savings obtained no longer had the same weight observed in previous decades. The consumption pattern had changed, and part of the demand began to occur during the afternoon, especially on hot days.
With this change, the direct benefit of extra daylight in the early evening became smaller. The popularization of electronic devices, refrigeration systems, and new work and leisure habits reduced the weight of artificial lighting in total consumption.
Despite the suspension, the topic remained present in the evaluations of the electricity sector. The Ministry of Mines and Energy informs that the policy is reevaluated according to the conditions of supply, consumption, and system operation.
Also included in the analysis are the behavior of reservoirs, demand forecasts, and the capacity to meet demand during the most critical hours. These factors help define whether changing the clocks would have a relevant effect.
Solar energy weighs in on the clock change analysis
The expansion of solar energy has made the evaluation more detailed. During the day, this source helps reduce the need to activate other power plants, but production decreases in the late afternoon, when residential consumption tends to grow.
This movement creates a more demanding demand curve for the operation of the electrical system, according to sector evaluations. The drop in solar generation needs to be compensated by other sources, such as hydroelectric, thermal, or different forms of energy operation.
In this context, daylight saving time has once again been analyzed from the perspective of demand shifting. The intention would not only be to reduce the total daily consumption but to alter part of the time when energy is used.
In the population’s routine, a potential resumption would mean leaving the standard time earlier. The late afternoon would be brighter, while mornings would start darker in several cities, as occurs in models of this type.
This effect on routine is usually considered in government and productive sector evaluations. Workers, students, businesses, and services that depend on fixed schedules are among the groups directly affected by clock changes.
Return of daylight saving time not yet confirmed
So far, the government has not confirmed the return of daylight saving time. The official position is one of monitoring, without defining a date, format, or definitive list of states for a potential resumption.
In October 2025, the Minister of Mines and Energy, Alexandre Silveira, stated that the country would not need to resume the measure that year, although monitoring would continue. For 2026, there is also no official announcement of a return.
If the measure is adopted again, the trend is that the impact will concentrate on the locations where it was previously applied, due to the greater variation in brightness in the summer compared to other areas of the country.
The decision would also have to consider the operation of the electric sector, communication with companies and public services, digital systems, air transport, and the adaptation of the population. Time changes affect schedules, work shifts, and service synchronization.
Meanwhile, rumors about an immediate resumption continue to circulate on social media. The federal government has already published previous clarifications to deny automatic adoption of the measure and reinforce that the matter remains under evaluation.
In the United States, the recent discussion helped reignite the topic in Brazil, but the contexts are different. There, the debate involves the possibility of maintaining a permanent model; here, the declared focus is on energy supply during peak consumption hours.
For now, the routine of Brazilians continues without changes to the clocks. Daylight saving time may be reconsidered if studies indicate a significant benefit for the electrical system, especially in the late afternoon and early evening. Until there is an official decision, however, there is no confirmed change in the national calendar.
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