One of the major innovations of the 2026 Formula 1 season, as well as of the new technical regulations, concerns the type of fuel that will be used by the cars. From this year onward, the top category is expected to adopt exclusively 100% sustainable fuels. However, just over a week before the start of the first pre-season tests, scheduled to take place in Barcelona, the FIA has decided to take a step back.
The governing body has granted a temporary exemption that will not make the use of this new fuel mandatory during the Spanish test sessions, nor during the subsequent tests in Bahrain.
The Federation’s decision is mainly linked to the extremely high costs of sustainable fuel, which are estimated at around 300 euros per litre. In addition, as reported by Auto Motor und Sport, the homologation procedures and the complexity associated with the development and production of the new CO₂-neutral blends would require timeframes that are simply too long to be met at this stage.
To achieve the performance levels required in Formula 1, the 2026 fuels will rely on molecules specifically developed in laboratories. Many of these components are not yet available on an industrial scale, forcing suppliers to produce them in-house. This results in an extremely expensive and slow manufacturing process, effectively turning fuel into a genuine competitive factor.
Higher energy density, for example, would allow teams to reduce the amount of fuel carried on board, delivering a direct benefit in terms of overall car weight. For this very reason, collaboration between power unit engineers and chemists has become more strategic than ever within Formula 1’s technical landscape.
Beyond the economic and production-related aspects, however, both the FIA and the teams also have serious concerns from a reliability standpoint. The new sustainable fuels could potentially cause issues for the 2026 power units, which are designed to operate with these blends but are also characterised by a high level of mechanical and thermal sensitivity.
The shared fear is that of severe engine damage, with potentially significant consequences in terms of costs and component availability. For this reason, the obligation to use sustainable fuels will only come into force in Melbourne, starting from the first free practice session of the opening race weekend of the season.
The exemption granted by the FIA, however, will be short-lived. According to the information currently available, from the 2027 season onwards even test sessions will have to be carried out exclusively with fully homologated fuels that comply with the carbon-neutrality criteria set out in the regulations.
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