Synthetic E-Fuels Cost 5-10x More Than Fossil Jet Fuel with No Clear Path Down

Synthetic electrofuels (e-fuels) — liquid hydrocarbons produced by combining green hydrogen with captured CO2 — currently cost between $7 and $15 per gallon to produce, compared to roughly $2 per gallon for conventional jet fuel. Even the most optimistic industry projections from companies like HIF Global and Porsche's Haru Oni plant in Chile show costs declining to perhaps $4-5 per gallon by 2035, still 2-3 times the fossil baseline. The Haru Oni facility, the world's most publicized e-fuel plant, produces only 130,000 liters per year — enough to fuel about 70 transatlantic flights. This matters because aviation and long-haul shipping have almost no viable electrification pathway. Batteries are too heavy for commercial aircraft, and hydrogen's low volumetric energy density makes it impractical for existing airframes. E-fuels are chemically identical to fossil fuels and work in current engines and infrastructure with zero modifications — a genuine drop-in replacement. If e-fuels cannot scale, these sectors representing roughly 5% of global CO2 emissions have no credible decarbonization pathway before 2050. The pain compounds because of the staggering energy inefficiency involved. Producing e-fuels requires electrolysis (to make hydrogen), direct air capture or point-source capture (to get CO2), and Fischer-Tropsch or methanol synthesis (to combine them into liquid fuel). The well-to-wheel efficiency is roughly 13-15%, meaning you need about 6-7 times more renewable electricity to move a plane on e-fuel than you would to move an equivalent electric vehicle on battery power. This means e-fuels are only viable in a world with massive surplus renewable electricity — a world that does not yet exist. The structural reason costs remain high is that every input is expensive simultaneously. Green hydrogen requires cheap renewable power and electrolyzers (both still scaling). Direct air capture costs $400-600 per ton of CO2. Fischer-Tropsch synthesis requires high temperatures and pressures with expensive catalysts. No single breakthrough can fix the cost problem because it is a chain of three or four individually expensive processes multiplied together. In the first place, e-fuels exist in an economic no-man's-land: too expensive for airlines to adopt voluntarily, yet too important to ignore for net-zero commitments. The EU's ReFuelEU mandate requires 1.2% synthetic fuel in aviation by 2030 and 35% by 2050, but no one has demonstrated how to produce these volumes at any price, let alone an affordable one.