In the race to go carbon neutral, are efuels the way forward?

In the race to go carbon neutral, are e-fuels the way forward?

TL;DR: So, are e-fuels the way forward?

For most UK drivers looking for their next car, e-fuels aren’t a practical near-term option.

The new vehicle market is moving towards electrification, and the UK’s Zero Emission Vehicle (ZEV) mandate makes no allowance for e-fuel powered cars. But for sectors that can’t yet make that transition – aviation, long-haul shipping, and the billions of existing combustion engine vehicles already on the world’s roads – e-fuels could become one of the more significant energy technologies of the next few decades.

Whether that potential translates into commercial reality depends almost entirely on the pace of production scaling and the availability of cheap, renewable electricity to power the manufacturing process.

Do you know your e-kerosenes from your e-methanes or e-methanols?

The term e-fuels has been appearing in motoring headlines with increasing regularity, usually accompanied by either breathless enthusiasm or deep scepticism.

The truth sits somewhere in between.

And it’s considerably more interesting than either camp tends to admit.

What are e-fuels?

E-fuels – also called synthetic fuels – are manufactured liquid fuels made from just two ingredients: Captured carbon dioxide (CO2) and hydrogen.

Renewable electricity powers the hydrogen production process, and the resulting hydrogen is then combined with that captured CO2 to create a fuel that’s chemically almost identical to conventional petrol or diesel.

The chemical similarity is the whole point of e-fuels.

Because these synthetic fuels behave like the fuels we already use, they work in standard internal combustion engines (ICE) without modifications, and you can transport and store them using the existing petrol and diesel infrastructure.

Aka, petrol stations.

E-kerosene, e-methane, and e-methanol are the main varieties, each suited to different uses across transport, aviation, and industry.

How e-fuels are made

The production process has four main stages, and the energy lost at each one adds up – which is largely why scaling e-fuels remains so tricky.

First, CO2 is captured from the atmosphere, requiring roughly one to three megawatt hours of energy per tonne. Next, water is split into hydrogen and oxygen through electrolysis, powered by renewable electricity. The hydrogen and concentrated CO2 are then combined and converted into liquid fuel at high temperatures and pressures.

Finally, the raw product is refined into the finished fuel.

Every step in that chain loses energy. Until renewable electricity becomes significantly cheaper and more widely available, e-fuels will remain a premium product.

The carbon neutrality question

Technically, e-fuels are carbon neutral.

The CO2 captured during production offsets the CO2 released when the fuel burns in an engine, making the net carbon balance zero. 

But there’s a catch – the electricity source.

Research by Transport and Environment (T&E), modelling lifecycle emissions from a medium-sized car bought in 2030, found that synthetic fuel produced entirely from renewable electricity generates around 35 grams of CO2 equivalent per kilometre. 

But the same research found that e-fuel produced under the EU’s Renewable Energy Directive II standard, which allows up to 15% from non-renewable sources, comes in at around 97g/km.

Producing e-fuels entirely from renewable electricity at scale isn't realistic in the near term — so the carbon neutrality claim comes with a significant caveat.

E-fuels alongside electric vehicles

The e-fuels debate has a tendency to put them against electric vehicles (EVs), as though only one can win.

That framing doesn’t really hold up.

EVs are where the industry’s money is going, and the environmental case for them over a lifetime of use is well established – even accounting for the energy and materials needed to manufacture lithium-ion batteries, and the ethical questions around mining lithium, cobalt, and nickel.

Battery tech is also moving faster than the headlines often suggest.

Up to 90% of battery materials can now be recovered and reused, and initiatives like the Global Battery Alliance are actively working on improving labour standards in cobalt supply chains.

It’s not a perfect picture, but it’s certainly getting better.

So, e-fuels aren’t arriving to rescue us from EVs. But they are useful in places EVs can’t reach yet.

Where e-fuels make the most sense

Start with the obvious one: You can’t plug a Boeing 747 into a wall.

Long-haul aviation and ocean freight have no credible path to electrification in the near term – battery energy density makes them impractical for long-haul, and running container ships on hydrogen would be one big logistical and infrastructural headache.

E-fuels, specifically e-kerosene for aviation and e-methanol for marine use, slot into the existing engines and supply chains without requiring either to be rebuilt from scratch.

Only 0.3% of global jet fuel was synthetic in 2024; researchers think that could reach 50% by 2050 as production costs fall. The aviation industry is watching this space closely, and so is Boeing.

The existing vehicle fleet is another big argument.

There are around 1.3 billion combustion engine vehicles on the world’s roads, and most of them aren’t going anywhere for decades, regardless of what happens with new car sales from 2035 onwards.

E-fuels offer a way to keep those vehicles running without adding new CO2 to the atmosphere. No new infrastructure, no replacement vehicles needed.

And for markets where EV charging networks are years behind and the electricity grid isn’t yet clean enough to make widespread EV use environmentally meaningful, e-fuels could serve as a handy bridge.

They don’t need to be a permanent fixture to be worth investing in.

What the law says – and where the UK and EU take different paths

The EU’s journey to its 2035 zero-emissions rule was, to put it diplomatically, eventful.

Germany blocked the final vote at the eleventh hour, demanding a carve-out for e-fuels – a move that caught most of Europe off guard given that Germany had supported the legislation throughout the process.

A three-week standoff followed before a compromise was reached. The 2035 rule would pass, but ICE vehicles running exclusively on certified, carbon neutral e-fuels would be exempt from it, provided they’re fitted with tech that stops them running on conventional petrol or diesel.

Environmental groups weren’t thrilled.

The EU’s own modelling suggested that under realistic production conditions – where e-fuels aren’t made from 100% renewable electricity – those vehicles would still emit more lifecycle CO2 than battery EVs.

The exemption has survived, and it means that e-fuels, politically, remain part of the wider conversation.

But the UK? We went a different way.

The ZEV mandate – introduced in 2024 and tweaked by Labour in 2025 – sets a clear trajectory: 80% of new car sales must be zero-emission by 2030, rising to 100% by 2035, with no e-fuels exemption. An ICE car running on synthetic petrol can’t be sold new in the UK after 2035, full stop.

The government is set to review the mandate again in early 2027, but there’s no sign it’s planning to follow the EU’s lead on this one.

However, whatever happens in the next decade with production and policy could shift the picture, so it’s worth keeping an eye on.

The companies building the e-fuel future

The production landscape is still early stage, but it’s gaining momentum.

Porsche has put over $100 million into HIF Global, whose Haru Oni plant in southern Chile – running on wind power and operational since December 2022 – is producing synthetic fuel today, albeit at pilot scale. That's 130,000 litres a year, currently funnelled into Porsche’s motorsport programme.

HIF is planning to scale up commercially at sites in Chile, the US, and Australia by the end of the decade.

Prometheus Fuels, backed by BMW among others, hit a milestone in October 2025 that its founder describes as full commercial readiness – the ability to make petrol-equivalent fuel from air and solar electricity, at room temperature, without a refinery.

To prove it works, they ran a 1968 Ford Mustang on the stuff.

Norsk e-Fuel, with Norwegian Airlines and Boeing on board as partners, is developing its Mosjøen facility in northern Norway with the aim of producing sustainable aviation fuel from 2026. It’s still in the engineering phase, with three further sites across Finland and Sweden in earlier stages.

The whole operation is focused on aviation; the sector with arguably the most urgent need for what e-fuels can offer.

Hydrogen fuel cell vehicles (FCEVs) are also in this race, generating electricity solely from hydrogen with nothing but water vapour coming out of the exhaust. The Toyota Mirai has been on UK roads for some time now, though in very small numbers. Refuelling infrastructure is thin, but it does exist.

Ultimately, no single technology has solved the problem of CO2 emissions yet, and e-fuels are one of several attempts to crack the code.

The verdict

For your next car, go electric.

The UK’s regulatory direction is set, the EV market has more choice than it’s ever had, and the day-to-day case for making the switch is strong.

E-fuels aren’t coming to challenge that.

But they’re doing something important in the background: Making progress on the parts of the transport problem that EVs can’t reach. Aviation. Shipping. The enormous global fleet of combustion vehicles that’ll stay on the roads long after the petrol and diesel ban deadline passes.

The chemistry is proven.

The production facilities are being built.

The costs are high, and the dependency on renewable electricity is a constraint that will take years to fully resolve. But the companies putting their cash into this problem aren’t doing it on a whim.

If you want to know where e-fuels will matter first, don’t look at your driveway.

Look at the plane you’re boarding on your next holiday – that's where they’re most likely to make their mark.