The 2026 Formula 1 technology shift is a complex affair, with a focus on bigger batteries and energy management. However, an equally significant change that has been embraced and is here to stay is the switch to advanced sustainable fuels. This development not only strengthens F1's green credentials and positions it at the forefront of a technology race with broader automotive implications, but it also opens the door for the return of 'old-school' V8 engines in the next rule change.
The new fuels are a crucial component of the 2026 rules package, as they enable V8 engines to return from 2031 at the latest. With the removal of the requirement to burn fossil fuels, F1 is no longer limited to a specific type of power unit. This shift in focus from combustion to electricity has been overshadowed by the debate over energy-starved cars and the qualifying spectacle, but the role of fuel in performance has not been fully acknowledged.
BP's motorsport fluids technology lead, Luc Jolly, explains that the amount of energy available in the battery is heavily dependent on the output of the internal combustion engine, which in turn relies on the quality of the fuel. This means that a better fuel directly contributes to more energy in the batteries. Despite the focus on energy management, the primary role of the fuel has not changed, and it remains the primary energy source of the car.
The development of sustainable fuels has been a long and involved process, requiring BP to tap into its experiences in the outside world and work closely with Audi. The biggest challenge was understanding what the product should be, rather than creating it. The fuel flow limit has been replaced with a calorific one, with a limit of 3000 Mega Joules per hour, requiring a different approach compared to the previous 100kg per hour ceiling.
The sustainable fuels are made from raw materials that fit within specific categories, such as biomass, municipal waste, or renewable fuels of non-biogenic origin (RFNBO). The process involves measuring the energy used to process the molecules and calculating the carbon intensity of the process. The FIA has set a limit that the new race fuel needs to save 65% or more greenhouse gas in comparison to a basic standard reference fossil fuel.
Despite the lack of attention given to sustainable fuels, they are as critical as ever from a performance point of view. The role of fuel in ultimate performance has not diminished, but there are now more restrictions on how it is created and sourced. This shift in focus from combustion to electricity has opened up new possibilities for F1, and the development of sustainable fuels is a key part of the sport's future.
