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Freedom251 › Blog › Aviation

How Biomass Becomes Sustainable Aviation Fuel—and What It Takes to Scale

By Freedom251 Team · · 5 min read

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Yes. Biomass can be converted into sustainable aviation fuel (SAF) through routes including alcohol-to-jet (ATJ) and Fischer–Tropsch (FT). But a bio-based origin alone does not make a fuel suitable for aircraft or guarantee lower life-cycle emissions. Each feedstock and conversion route must meet fuel requirements, show credible emissions performance, and work as a dependable, affordable supply chain.

What biomass can become aviation fuel?

Biomass is a broad category, not a single fuel ingredient. The U.S. Department of Energy (DOE) identifies resources relevant to SAF production that include crops and residues, waste materials, and fats or oils. Which resources can be used depends on the conversion pathway; not every feedstock can go through every process.

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  • Crop-based resources: corn grain, oil seeds, and dedicated energy crops.
  • Residues and wood-related resources: agricultural residues, forestry residues, and wood-mill waste.
  • Waste-derived resources: municipal solid waste and wet wastes.
  • Oils and similar materials: fats, oils, and greases.
  • Algae: another resource identified by DOE.

Some of these materials already have competing uses; others may be costly or difficult to collect consistently. A headline estimate of total biomass therefore does not tell an airline or fuel producer how much feedstock can actually be secured for aviation.

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How does the conversion process work?

The route from raw material to aircraft fuel has several linked stages. As ICAO defines it, a conversion process is “a type of technology used to convert a feedstock into aviation fuel.” In practice, the overall chain includes:

  1. Select and collect a feedstock. Its type, location, competing uses, and collection logistics shape the rest of the project.
  2. Prepare the material. Collection and preprocessing create a suitable input for the chosen route.
  3. Convert and upgrade it. The process transforms the input and prepares the resulting fuel blend component for aviation use.
  4. Qualify the fuel and blend it as permitted. The pathway and fuel must meet applicable specifications; an approved pathway may also have a maximum blend ratio.
  5. Distribute and use it. Once qualified and blended within the applicable limits, SAF can move through fuel infrastructure for aircraft use.

This is not a single universal recipe. A pathway’s approval and permitted blend depend on the specific conversion process and applicable fuel requirements.

Alcohol-to-jet (ATJ)

ICAO lists ATJ synthetic paraffinic kerosene pathways using alcohols such as ethanol, isobutanol, and isobutene derived from biomass. The alcohol is an intermediate in the route, rather than biomass being poured directly into an aircraft fuel system. The particular feedstock, processing route, and fuel qualification all matter.

Fischer–Tropsch (FT) and other routes

FT is among the conversion pathways ICAO lists, alongside ATJ and other processes. A route name on a pathway list should not be taken to mean that every possible feedstock-and-process combination is approved. For a specific project, check the current ICAO conversion-process table for its approval status and blend limit.

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When is biomass-derived fuel usable in aircraft?

“Drop-in” describes SAF’s potential compatibility as a blending component with existing aircraft engines and fuel infrastructure; it is not blanket approval for any experimental fuel. DOE says pathways must meet fuel specifications and undergo testing and certification for compatibility. ICAO lists approved conversion pathways and their maximum blend ratios.

As of July 2023, ICAO reported 11 approved conversion processes and 11 more under evaluation. Those counts are a dated snapshot, not a current status report. ICAO also described ongoing work on 100% SAF use and higher co-processing limits. That work does not establish that all SAF can currently be used neat, without blending, or that every process has the same limit.

How should the climate benefit be judged?

“Bio-based” does not mean zero-emission. ICAO’s CORSIA life-cycle accounting considers emissions across the fuel’s chain, including feedstock cultivation or recovery, processing and extraction, transport, conversion, distribution, and combustion. It also accounts for indirect land-use-change emissions; certain eligible municipal-solid-waste fuels may qualify for optional credits.

The resulting life-cycle intensity is expressed in grams of carbon-dioxide equivalent per megajoule. ICAO allows either default values or actual values supported by technical information under its methodology. That means a credible comparison should look not only at a pathway’s reported number but also at whether the feedstock, processing, transport, and other inputs are traceable and adequately documented.

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  • Ask which feedstock and conversion route the figure covers.
  • Check whether the value is a methodology default or is based on supported actual data.
  • Account for transport and land-use effects rather than treating combustion as the whole footprint.
  • Do not assume that two fuels described as SAF have identical life-cycle intensities.

Why is scaling SAF difficult?

Cost, supply, and demand all affect whether a technically workable pathway becomes a sustained fuel business. DOE reported on 13 November 2024 that SAF cost two to ten times as much as fossil jet fuel, varying by feedstock and conversion technology. This is a reported range from that date, not a live 2026 price or a cost estimate for any particular route.

Projects also need reliable feedstock collection, conversion capacity, fuel qualification, distribution, and buyers. DOE identifies policy support, including federal and state incentives, as relevant to scale-up. Long-term offtake agreements can make demand more predictable and help projects secure financing. The cost range alone does not show which pathway will be cheapest at a given location or once a project reaches commercial scale.

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What does the U.S. biomass estimate mean for aviation?

DOE’s summary of the 2023 Billion-Ton Report says U.S. biomass production could exceed 1 billion tons per year and estimates potential for 60 billion gallons of liquid biofuels. Those are broad resource and biofuel-potential figures—not a forecast of SAF output or of fuel available to airlines.

The amount that could realistically serve aviation depends on sustainable availability, competing uses, collection limits, conversion yields, and environmental constraints. The estimate is useful as a picture of the possible resource base, but it does not settle how much aviation fuel can be produced or at what cost.

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How to compare two proposed biomass-to-SAF pathways

There is no universal winning route established by the available comparable evidence. A meaningful project comparison should address the same practical questions for each option:

  • Feedstock: What material is used, how much can be reliably collected, what other uses compete for it, and how far must it travel?
  • Fuel qualification: Is the specific route approved, what specification applies, and what blend limit is permitted?
  • Performance and cost: What are the fuel yield, capital and operating needs, and feedstock costs, using comparable and reliable data?
  • Climate accounting: What is the life-cycle intensity, how are land-use effects handled, and what evidence supports the result?
  • Route to market: Where is the project, which policies or incentives apply, and is there an offtake arrangement?

Without comparable, current route-by-route cost and yield figures or a region-specific project comparison, ranking technologies on economics would be misleading. The sound conclusion is conditional: biomass conversion can contribute to aviation fuel supply, but the case for any individual pathway rests on its feedstock, qualification, verified climate performance, and commercial fit.

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Aviationbiofuelsbiomassenergysustainable aviation fuel

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