Synthetic fuels ("e-fuels") are made by combining captured CO2 with hydrogen produced from renewable electricity, creating a liquid fuel that can run in existing combustion engines with near-zero net additional carbon impact - in theory. The EU carved out an exemption for e-fuels in its 2035 combustion-engine phase-out rules after pressure from Germany and automakers, and in late 2025 the European Commission proposed further softening the full ban into a 90% emissions cut requirement instead, partly to accommodate e-fuels and plug-in hybrids. Critics point out e-fuels currently cost several times more per liter than gasoline and require far more renewable electricity per mile than simply charging a battery EV directly.
At a glance
| Aspect | Status |
|---|---|
| How e-fuels are made | captured CO2 + hydrogen (from renewable electricity) synthesized into liquid fuel |
| EU policy status (2026) | e-fuels exemption carved into 2035 rules; Commission proposing 90% emissions-cut approach vs. outright ban |
| Current cost vs. gasoline | several times more expensive per liter/gallon at current production scale |
| Energy efficiency vs. direct EV charging | significantly less efficient - most renewable electricity is lost in the conversion process |
| Main proponents | Porsche, several German automakers, some motorsport and classic-car advocates |
What synthetic fuels actually are
E-fuels are produced by using renewable electricity to split water into hydrogen via electrolysis, then combining that hydrogen with CO2 (ideally captured directly from the air or industrial sources) through a chemical synthesis process to produce a liquid fuel chemically similar to gasoline or diesel. The appeal is that it can be used in existing combustion engines and existing fuel-distribution infrastructure without any vehicle modification, unlike hydrogen fuel cells or battery EVs, which both require entirely different vehicle architecture.
Why some automakers are pushing hard for it
- Porsche has invested significantly in e-fuel production (notably a pilot plant in Chile) partly to preserve combustion engines for sports cars and existing customer fleets even as emissions rules tighten.
- German automakers broadly lobbied hard for the EU's e-fuels exemption, motivated partly by protecting engine manufacturing jobs and partly by genuine belief in a multi-pathway approach to decarbonization.
- Classic and performance car advocates see e-fuels as the only realistic path to keeping millions of existing combustion vehicles on the road without eventually banning their use outright.
- Aviation and shipping industries, where battery weight makes electrification far harder, are watching e-fuel development closely since a similar synthesis approach applies to jet fuel and marine fuel too.
The efficiency critique
The strongest technical criticism of e-fuels for passenger cars is efficiency: converting renewable electricity into hydrogen, then into synthetic fuel, then burning that fuel in a combustion engine loses a large majority of the original energy at each conversion step. Charging a battery EV directly with the same renewable electricity delivers several times more useful driving distance per unit of renewable power generated. Critics argue this makes e-fuels a poor use of scarce renewable electricity for ordinary passenger cars, better reserved for applications - aviation, shipping, heavy industry - that can't easily electrify directly.
Where the EU policy actually stands
The EU's 2035 new-combustion-car sales effectively-ban already included a narrow carve-out allowing vehicles that run exclusively on verified carbon-neutral e-fuels. In December 2025, the European Commission went further, proposing to replace the outright 2035 ban with a requirement that new combustion vehicles achieve a 90% average emissions reduction compared to a 2021 baseline - a change still being negotiated through 2026 that would give automakers more flexibility to use e-fuels, plug-in hybrids and range-extenders rather than requiring pure battery EVs by 2035.
What this means practically
For ordinary car buyers, e-fuels aren't a near-term option - production volumes remain tiny and prices high, so no mainstream retail e-fuel product exists at gas stations today. The debate matters more for policy direction (whether combustion engines get a longer runway) and for niche applications (motorsport, classic car preservation, aviation) than for what's actually available to buy and pump into a car in 2026.
Don't confuse e-fuels with biofuels (ethanol, biodiesel) - biofuels are made from crops or organic waste and are already widely blended into pump fuel today, while e-fuels are a chemically different, still largely pre-commercial technology made from captured CO2 and renewable hydrogen.
Frequently asked questions
Can I buy synthetic fuel (e-fuel) for my car today?
Are synthetic fuels actually carbon neutral?
Why did the EU exempt e-fuels from its 2035 combustion engine rules?
Are e-fuels more efficient than battery EVs?
Is the EU still planning to ban combustion engines by 2035?
Sources & further reading
- European Commission - 2035 CO2 standards for cars and vans policy updates
- International Council on Clean Transportation - e-fuels analysis
Figures, prices and policy details were current at the last-updated date above. Automotive pricing, incentives and regulations change frequently — verify time-sensitive details with the linked primary sources. Read our editorial policy and fact-checking standards.
