As the need for sustainable energy sources grows, e-fuels have emerged as an alternative to traditional petrol and diesel. These fuels could potentially extend the lifespan of combustion engine cars, even as plans are underway to phase out their sale in the next decade.
However, questions remain regarding their practicality and suitability in achieving a net-zero future. Porsche, a notable advocate for e-fuels, has established a fuel refinery in Chile and successfully obtained an exemption from the European Commission’s ban on petrol cars by 2035. In contrast, the UK government has not granted such an exemption. With Porsche planning to race vintage models fueled by
e-fuels, the question arises: Could e-fuels disrupt efforts to phase out internal combustion engines?
Understanding E-Fuels: Unlike traditional petrol derived from crude oil, e-fuels take a different production route. Instead of refining crude oil, e-fuels are synthesized through the splitting of water into hydrogen and oxygen. Hydrogen is then combined with carbon dioxide to create hydrocarbons, the primary component of petrol. These chemical reactions are powered by electricity, which can be sourced from
renewable sources like solar and wind energy. Consequently, e-fuels can be viewed as a relatively environmentally friendly option for powering vehicles.
Challenges and Limitations: The main criticisms against e-fuels revolve around their cost and efficiency. Electric cars, in comparison, are touted as being between 70% and 90% energy efficient, with Renault claiming their EV engines reach 90% efficiency.
On the other hand, combustion engines have historically achieved a maximum efficiency of around 40%, despite decades of improvement. When using e-fuels, one must consider this energy loss, compounded by the energy-intensive production process, which contributes to their high cost.
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A 2017 study suggested significant subsidies would be necessary to make e-fuel production economically viable at scale. Furthermore, e-fuels are not considered a direct replacement for traditional petrol, raising doubts about their suitability for widespread adoption.
Target Audience and Applications: The support for e-fuels from major players such as Ferrari and Porsche indicates their intended audience. These companies have strong associations with combustion engines, although Ferrari has expressed intentions to transition 80% of their lineup to EV or hybrid vehicles by the end of the decade. Some individuals are reluctant to part with the exhilaration of a roaring engine, preferring it over a simulated engine sound played through speakers in an electric vehicle.
However, e-fuels also hold potential for reducing emissions in aviation, albeit in combination with conventional fossil fuels due to challenges in scaling up e-fuel production. P2X Europe’s co-CEO, Christoph Weber, highlights the small proportion of e-fuel required in aviation, given the industry’s enormous kerosene consumption.
While e-fuels may offer a positive impact in certain sectors like aviation, the current energy density of electric vehicle batteries still lags far behind traditional airplane fuels. Continued advancements in battery technology are necessary to bridge this gap.
As discussions surrounding e-fuels and their viability in a net-zero future persist, their potential to prolong the lifespan of internal combustion engines remains uncertain. Only time will tell if e-fuels can carve out a visible future for these engines or if alternative technologies will ultimately prevail.
