Methanol-to-Jet Clears ASTM Gate. What Changes Now?

Methanol-to-jet has crossed a critical technical gate for commercial aviation fuel. ASTM D7566-26a, the active specification updated July 30, 2026, incorporates methanol into the Annex A5 alcohol-to-jet pathway. The change does not make methanol-derived fuel automatically sustainable or economic, but it gives MTJ developers something essential: an accepted route into the aviation fuel specification system.

Annex A5 alcohol-to-jet synthetic paraffinic kerosene, or ATJ-SPK, has a maximum blend level of 50% by volume with conventional jet fuel. ASTM's current specification confirms Annex A5 as the ATJ pathway, and ICAO's SAF conversion-process documentation lists the Annex A5 maximum blend at 50%. The July revision expands the alcohol feedstock platform to methanol.

Why does ASTM approval matter more than another pilot?

ASTM qualification addresses a barrier that a successful pilot plant cannot remove. D7566 defines requirements for aviation turbine fuel containing approved synthetic blending components and establishes how those components enter certified aviation fuel.

The commercial importance is explicit in the standard. Fuel manufactured, certified and released to D7566 requirements meets ASTM D1655 requirements and is regarded as D1655 turbine fuel. ASTM also states that after redesignation as D1655 fuel, it can be handled like equivalent conventionally refined aviation turbine fuel.

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The market still needs additional pathways. IATA estimates global SAF production will reach about 2.4 million metric tonnes in 2026, only 0.8% of aviation fuel consumption. Its long-term estimate is roughly 500 million metric tonnes of annual SAF supply to support aviation's 2050 net-zero pathway.

>> RELATED: New Report Identifies Methanol-to-Jet as a Key Accelerator of the Next Wave of Sustainable Aviation Fuel

Where does MTJ fit among the main SAF pathways?

MTJ adds another feedstock option to the SAF portfolio rather than displacing HEFA, ethanol-to-jet or power-to-liquid routes. Its distinguishing commercial feature is methanol's flexibility as an intermediate molecule.

SAF pathway	Main feedstock	Commercial maturity	Feedstock constraint	Key advantage
HEFA	Fats and oils	Commercial	Finite sustainable lipid supply	Established production base
Ethanol-to-jet	Ethanol	Early commercial	Ethanol economics and lifecycle carbon intensity	Large U.S. ethanol production base
Methanol-to-jet	Methanol	Emerging	Supply and cost of qualifying low-carbon methanol	Multiple potential methanol production routes
PtL/eSAF	Captured CO2 + hydrogen	Early commercial	Renewable electricity and hydrogen cost	Low dependence on fossil carbon feedstocks

LanzaJet's ethanol-to-jet commercialization demonstrates how ASTM qualification can be followed by industrial deployment. Its Freedom Pines Fuels plant in Georgia has annual capacity of 10 million gallons. MTJ now has the specification pathway, but still needs its corresponding commercial-scale operating milestone.

Could aviation become a second growth market for methanol?

Aviation can now compete with shipping and chemicals as a downstream market for renewable methanol. MI reports more than 110 million metric tonnes of global annual methanol production, but only about 0.9 million tonnes of current renewable methanol production. That distinction is central to the MTJ opportunity.

The shipping sector has already helped create demand for renewable methanol. More than 150 methanol-capable vessels are operating and over 290 are on order, according to MI. DecarbonFuse has also tracked an 8,000-metric-ton biomethanol bunkering operation in Shanghai supplied from Shanghai Electric's Taonan project.

MTJ potentially links aviation to that expanding supply chain. Methanol can be made from biogenic resources, including waste-derived carbon streams, or synthesized from captured CO2 and renewable hydrogen. However, conventional fossil-derived methanol remains very different from renewable methanol when lifecycle emissions are calculated.

The commercial distinction is important. carbon-utilization projects producing methanol and renewable hydrogen-based e-methanol projects could gain another potential customer class. ASTM qualification expands the addressable market for the molecule, but does not guarantee that individual methanol projects meet SAF sustainability rules.

What changes for North American MTJ developers?

Nacero provides the clearest U.S. project case study. Its planned Texas facility is designed around Topsoe's SynCOR Methanol and MTJet technologies. Nacero has stated that a fully developed facility could produce 250 million gallons per year of zero-sulfur products, including up to 145 million gallons per year of SAF.

Nacero announced the Texas MTJ project in 2023, when MTJ was still moving through ASTM qualification. The company subsequently said DOE invited Nacero TX to submit a Part II application for a Title XVII loan guarantee covering approximately 75% of project capital.

That invitation dates to May 2023 and is not a DOE loan commitment. Nacero's original announcement targeted a mid-2024 final investment decision, a timetable that has passed. The ASTM revision therefore improves the project's technical commercialization framework, but should not be interpreted as evidence that financing or construction has been completed.

Honeywell provides another U.S. connection. In February 2026, the company said Verso Energy selected its eFining methanol-to-jet technology for seven planned eFuel sites across France, Finland and the United States. In Canada, Ontario-based SIVA Green Energies describes planned RNG-to-methanol-to-SAF and CO2-plus-hydrogen-to-methanol-to-SAF pathways. These remain development initiatives rather than operating commercial MTJ plants.

ASTM approval does not make every methanol molecule sustainable

ASTM D7566 addresses technical fuel qualification, not the lifecycle carbon intensity of the methanol feedstock. Fossil-derived methanol can satisfy chemical requirements for an MTJ process without thereby becoming low-carbon SAF. Technical qualification, sustainability certification and subsidy eligibility are separate tests.

That distinction matters under U.S. Section 45Z. For fuel produced after December 31, 2025, the credit does not provide a special MTJ rate. Instead, the credit value depends on lifecycle emissions relative to the statutory baseline of 50 kilograms of CO2e per million Btu. A transportation fuel must have an emissions rate no greater than that threshold to qualify.

For SAF, taxpayers can use allowed CORSIA methodologies or 45ZCF-GREET as provided by Treasury guidance. The June 2026 update to 45ZCF-GREET therefore makes the methanol production route commercially important. Renewable electricity, hydrogen production, captured-carbon sourcing and other lifecycle inputs can materially change an MTJ fuel's calculated emissions rate.

There is another restriction for U.S. projects. Transportation fuel produced after December 31, 2025 must be exclusively derived from feedstock produced or grown in the United States, Mexico or Canada to qualify for 45Z. Treasury's February 2026 proposed regulations also confirm that the credit now applies to qualifying fuel sold through December 31, 2029.

The next MTJ milestone is commercial, not technical

The ASTM revision changes the MTJ market because developers no longer face the same pathway-qualification uncertainty. It does not prove that MTJ will beat HEFA, ethanol-to-jet or other eSAF technologies on delivered cost.

Low-carbon methanol is still scarce compared with the total methanol market. MI currently reports more than 110 million metric tonnes of annual methanol production but only about 0.9 million tonnes of renewable production. That gap explains both the opportunity and the constraint.

Commercial infrastructure is beginning to form around the pathway. Argus launched its first methanol-to-jet cost indexes in July 2026 for nine production locations, following effective ASTM approval of the pathway.

The next decisive proof point will be an operating commercial-scale MTJ plant delivering specification-compliant fuel under a bankable aviation offtake. For North America, Nacero's financing and project-development status remains worth watching. ASTM has opened the technical door. Developers must now prove that low-carbon methanol can move through it at commercial scale.

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