SAF costs ten times jet fuel, and that headline is close to useless

There is no single SAF price premium. The phrase covers at least three figures answering different questions: a modelled production cost, a market index price where liquidity exists, and a regulated compliance charge.

Before comparing any multiplier to fossil jet fuel, check which of those three is being quoted — because a 2.1x headline and a 10.6x headline can both be correct and still describe different fuels and different points in the supply chain.

Ask three people what sustainable aviation fuel costs and you can get three defensible answers that share nothing but a unit. A government quotes a modelled production cost. A price-reporting agency hands you a market value. An airline talks about a compliance charge. Nobody is lying; nobody is measuring the same object.

The headline multiplier makes it worse. “SAF costs ten times jet fuel” survives a fact-check while remaining close to useless, because the number underneath it might be a pathway estimate, a spot assessment from a thin market, or a fine a supplier decided to pass downstream.

Europe is where this turns concrete. ReFuelEU Aviation writes the cost into law, and the EU’s own aviation safety agency publishes reference prices for the same fuels. Both sit in the same policy conversation and measure entirely different things.

The three numbers hiding inside the SAF premium

Start with what each measure describes. A production-cost estimate asks what it costs to make the fuel, given a specific feedstock and process. Market-index pricing asks what buyers and sellers agreed to, or what bids and offers suggest, in a market active enough to quote. A compliance charge asks what someone pays when a mandate has to be satisfied.

Those are not three estimates of one quantity. They are three answers to three questions.

EASA’s 2024 reference data makes the first tangible: biofuel production at EUR 1,461 per tonne and synthetic e-fuel at EUR 7,695 per tonne. Same agency, same year, same unit — and a gap of more than five-fold between two pathways.

Line up the “Question answered” column and the mismatch stops being mysterious. A modelled production cost and a bid-and-offer assessment are not rival measurements of one object — they’re different instruments, occasionally pointed at the same molecule.

Why EASA publishes two kinds of price

The European Union Aviation Safety Agency doesn’t use one method, because one method wouldn’t survive contact with the market. Where a fuel trades in size — enough deals, enough counterparties — its reference pricing draws on actual market indices. Where no liquid market exists to quote, it builds the cost from the bottom up, input by input.

That design choice explains a great deal of the confusion. EASA’s figures look comparable because a single agency publishes them, but a production-cost estimate for e-fuels and a market-index reference for a waste-oil feedstock are not the same species of number.

Anyone citing “the EASA price” without saying which half of the methodology produced it has quietly skipped the important part.

The 2.1x and the 10.6x are both real

ICCT’s pathway analysis puts HEFA SAF at 2.1 times fossil jet fuel and power-to-liquid SAF at 10.6 times. Both circulate widely, frequently with the pathway label missing.

The spread isn’t sloppiness — it’s the shape of the two production routes. HEFA runs on waste oils and fats, so its cost moves with a commodity market. PtL depends on electricity instead, which ties it to power prices rather than to feedstock supply.

Quote one number and you have described one fuel. Quote it as “the SAF premium” and you have described none.

The layer that isn’t a fuel price at all

Then there’s the compliance layer, which behaves nothing like the first two. What airlines report is a charge that some suppliers add to fossil jet fuel purchases to cover satisfying their blending obligation.

The size of that charge should stop you cold. In IATA’s sample of airlines, the average came to about USD 54 per tonne of fossil jet fuel, while the going SAF market premium implied roughly USD 22 per tonne. Same market, same year, more than double.

The number comes from a sample, not from a tariff the EU sets. It is also the cleanest evidence that “SAF premium” needs an adjective bolted to the front before anyone repeats it.

Why the penalty formula moves the price

The Article 11 formula is the interesting machinery. Because the fine is tied to the price gap between SAF and conventional fuel, the regulation has written a price comparison into law — and the charges that flow from it shift whenever the underlying reference price shifts.

Platts handles the same divide differently again, publishing cost-based assessments built from production assumptions as one, and market-based values drawn from bids and offers as another. Two layers, one reporting agency, no obvious instruction on which to quote.

What’s missing is the bridge between these systems. No public database tracks the distance between mandated price, production cost, and market price across jurisdictions — which is why any single multiplier is a statement about one measurement system, never a universal fact about SAF.

How to read the next SAF number you see

Three questions do most of the work. Is the figure a modelled cost, a market index, or a charge tied to a mandate?

Which pathway — HEFA, PtL, or something else — does it describe? And is the unit per tonne, a multiple of fossil jet fuel, or an industry total?

The traveler-facing version is simpler. Whether a carrier absorbs a compliance cost, builds it into the fare, or lists it as a separate line is a commercial choice — ReFuelEU doesn’t settle it, and no official filing in the material reviewed breaks out the split. A surcharge on your booking is the airline’s decision, not something the regulation compels.

Supplier margins remain the unresolved layer. IATA reports that margins have widened among suppliers in some European markets where mandates apply, but it publishes no general percentage, and no public source reviewed here quantifies how private-equity ownership affects the price an airline finally pays. What carriers actually pay may sit above production-cost estimates — and nobody has put a number on the difference.

Key terms

ReFuelEU Aviation

ReFuelEU Aviation is the EU regulation — Regulation (EU) 2023/2405 — that places minimum sustainable aviation fuel blending obligations on aviation-fuel suppliers. Article 4 sets the required shares, and Article 11 sets the penalty method for suppliers that fall short. Because it creates an obligation rather than a price, the cost it generates depends on how each supplier chooses to recover it.

HEFA

HEFA stands for hydroprocessed esters and fatty acids, a production pathway that converts waste oils and fats into sustainable aviation fuel. It is the more established of the two routes discussed here, and its cost moves with the commodity market for its feedstock. That feedstock dependence is what separates its economics from a synthetic route built on electricity.

Power-to-liquid

Power-to-liquid, or PtL, is a synthetic pathway that builds jet fuel from electricity and captured carbon rather than from biological feedstock. Its economics therefore hinge on power prices instead of on a market for waste oils. That makes it the pathway most exposed to energy-market swings rather than to feedstock supply.

CORSIA

CORSIA is the international aviation carbon-offsetting scheme, and it runs on purchasing and blending records rather than on a per-tonne price schedule. Eligible claims move through chain-of-custody arrangements, so an operator can account for SAF without taking physical delivery of it. That is why a CORSIA entry belongs in an emissions ledger, not in a price comparison.

Book-and-claim

Book-and-claim is an accounting mechanism that lets an operator buy the environmental attributes of sustainable aviation fuel produced or uplifted somewhere else. It works alongside chain-of-custody rules, which keep the claimed attributes tracked separately from the physical fuel. For a traveler, it means the SAF credited to a flight may never have been in that aircraft’s tanks.

Questions? Answers.