The federal government decided to extend the diesel subsidy for another thirty days this Tuesday (27), maintaining the benefit at R$ 2.12 per liter. This action aims to mitigate the impacts caused by rising international oil prices, whose increase is driven by conflicts in the Middle East and the war between Russia and Ukraine.
The price of Brent crude oil, used as a global reference, fluctuated between US$ 100 and US$ 106 in the first half of October and reached US$ 113.17 on the 22nd. For the government, any value above US$ 70 generates considerable pressure on domestic market prices.
In addition to the rise in the commodity, the devaluation of the Brazilian currency, the real, also contributes to the increased cost of diesel production and importation. Although Brazil is a large oil producer, about one-fifth of the diesel consumed is imported, according to data provided by the National Petroleum Agency (ANP).
In August, the volume of imported diesel represented 23.14% of national sales of Diesel A, which does not yet have the mandatory biodiesel blend. The combination of these factors resulted in significant increases: common diesel rose by 6.67% in the first half of October, reaching an average of R$ 7.20 per liter, according to the Edenred Ticket Log Price Index (IPTL). S-10 diesel saw an increase of 5.07% in the same period, reaching R$ 7.46 per liter. Compared to January, common diesel registered a cumulative increase of 15.2%.
Prices also show regional variations. In the North, common diesel cost an average of R$ 7.75 per liter, and S-10 had an average price of R$ 7.80. In Roraima, common diesel reached R$ 8.19, and in Acre, S-10 reached R$ 8.30. In the South and Southeast regions, the average price for common diesel was R$ 6.97 per liter. This increase directly impacts cargo transport carried out mainly by trucks in Brazil. In agribusiness, the most expensive fuel raises freight and production costs, which may be passed on to food prices.
Why does Brazil need to import diesel?
Between January and August, Petrobras's diesel production managed to grow by 18.5%, increasing from 32.7 million to 38.7 million barrels. Even so, domestic production proved insufficient to meet all demand for the fuel.
In the first half of 2026, total diesel consumption in Brazil was 213.2 million barrels. According to ANP, national production reached 154.8 million barrels, while imports totaled 43.5 million barrels, equivalent to 20.4% of consumption during that period.
This dependence on imports is linked to the country's refining capacity. It is important to note that crude oil extraction differs from fuel production, as oil needs to be processed in refineries to be converted into diesel and other derivatives used by vehicles, agricultural machinery, and trucks.
In recent years, Petrobras has sold refineries to private companies as part of an asset divestment program. This movement gained momentum during the mandate of Jair Bolsonaro (PL), when the state-owned company negotiated units in the refining sector.
Paulo Feldmann, a professor at the Faculty of Economics, Administration, Accounting, and Actuarial Science of the University of São Paulo (FEA-USP), raises questions about the production costs of diesel in these refineries, alleging that, under certain circumstances, fuel produced in Brazil may be more expensive than imported fuel.
Francismar Ferreira, from the Institute of Strategic Studies of Oil, Natural Gas, and Biofuels (Ineep), argues that reducing import dependence requires expanding and modernizing Brazilian refineries, in addition to reviewing investments made by Petrobras in this segment.
Why does the diesel hike weigh so heavily on Brazil?
Starting in the second half of the 20th century, Brazil began prioritizing the use of highways for cargo transport, while railways lost relevance. This transition occurred parallel to the growth of the automotive industry and the expansion of road infrastructure.
Currently, the strong reliance on roads implies that the increase in diesel raises freight costs and, consequently, the cost of transporting goods. Paulo Feldmann, from FEA-USP, emphasizes: