The 2026 Formula 1 technology overhaul has been a hot topic, with a lot of attention on the switch to bigger batteries and the associated controversies. However, an equally significant change has been embraced and is here to stay: 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 sustainable fuels are a crucial component of the 2026 rules shift, and they have been embraced by the sport. While the focus has been on the electrical element and its impact on lap times, the contribution of fuel and its evolution for 2026 has perhaps not been fully acknowledged. BP's motorsport fluids technology lead, Luc Jolly, explains that the amount of energy the battery has available is heavily dependent on the output of the internal combustion engine, which, in turn, relies on the quality of the fuel.
Jolly emphasizes that the primary role of the fuel hasn't changed, and it remains the primary energy source of the car. The technical demands of optimizing a precise fuel blend are identical to those of the past, with each team having its own bespoke fuel blend. This optimization is critical to the power numbers produced, and it's a delicate balance between performance and sustainability.
The introduction of advanced sustainable fuels has required some rethinking, with a shift from a volumetric fuel flow limit to a calorific one. The 2026 limit is 3000 Mega Joules per hour, which has led to a different approach compared to the 100kg per hour ceiling of the past. BP, with its long history in F1 and its involvement with teams like Williams and Renault, has been working closely with Audi to develop these new fuels.
The biggest challenge, according to Jolly, was understanding what the product should be, rather than creating it. The process involved a lot of exploration and experimentation, with BP tapping into its experiences in the outside world to plot an agreed path with Audi. The goal was to understand the Audi power unit's appetite and componentry, and then find sustainable sources to meet those needs.
The sustainable fuels are made from various raw materials, including biomass, municipal waste, and renewable fuels of non-biogenic origin (RFNBO). These fuels are designed to save 65% or more greenhouse gas emissions compared to a basic standard reference fossil fuel. The development of these fuels is an ongoing process, with BP and other fuel companies exploring different options to meet the technical demands of F1 while adhering to the sustainable requirements.
Despite the lack of attention from fans, Jolly emphasizes that the role of fuel in ultimate performance is as critical as ever. The new fuels bring more restrictions and challenges, but they also present an opportunity for F1 to lead the way in sustainable technology, with potential implications for the wider automotive world.
