A new Harvard-linked study models a pathway to turn municipal solid waste into sustainable aviation fuel, with projected lifecycle cuts of 80 to 90 percent compared with conventional Jet A.
The analysis focuses on industrial gasification and Fischer Tropsch synthesis, and frames waste as a scalable, lower cost feedstock relative to other biofuel routes. It lands as airlines seek near term decarbonization options while electric or hydrogen aircraft remain years away for long haul service.
Harvard-led study models waste-to-jet
Researchers assess technical limits and integration choices, from syngas (a fuel gas made of a mixture of hydrogen and carbon monoxide) clean up to adding green hydrogen, and identify the carbon conversion penalty as the central bottleneck. Their modelling suggests meaningful gains are possible with process integration, but capital intensity and project risk remain.
In explaining the sector’s constraints, Jingran Zhang said, “there’s no silver-bullet solution” for carbon neutral aviation.
A companion summary underscores that waste-derived fuel can be cost competitive under carbon pricing and targeted incentives if plants reach scale using proven unit operations. The emissions range and cost signals are set out in the Harvard briefing on the 80 to 90 percent reduction finding.
Global supply of sustainable aviation fuel remains small next to total jet demand, even with new plants. Industry data indicate production could double in 2025 to about two million tonnes, still well under one percent of airline consumption, according to IATA’s latest outlook.
That supply gap keeps price premiums high, which pushes developers toward markets with clear mandates, credits, or offtake agreements. Europe’s blending mandates and U.S. tax credits help anchor project revenues during ramp up. Investors are watching whether municipal waste projects can win bankable feedstock contracts with cities, alongside gate fees, to stabilize costs.
Canada tests pathways and incentives
Canada’s waste-to-fuels story has evolved through demonstration and repositioning. Enerkem’s Edmonton facility, which validated commercial gasification for methanol and ethanol from municipal waste, was retired in January 2024 after meeting its scale up objective, the company said in a project closure notice.
Attention now shifts to larger build outs, including the Varennes Carbon Recycling plant in Quebec, which aims to combine non recyclable waste and biomass with wider industrial partnerships. The policy side is also moving, with the Clean Fuel Regulations and the C$1.5 billion Clean Fuels Fund shaping early project pipelines and front end engineering. These supports try to bridge first of a kind risks before private capital steps in at volume.
Natural Resources Canada backed front end engineering in January 2024 for a Manitoba project that targets roughly one billion litres per year of renewable distillates, primarily SAF, under a plan led by Azure Sustainable Fuels. The funding package of C$6.2 million, including C$5 million from the Clean Fuels Fund. Early stage work like this clarifies siting, feedstock logistics, and integration with rail and pipeline assets before a final investment decision. It also signals to airlines and airports that domestic SAF supply could become bankable if policy durability holds.
Scale and cost at scale
The municipal waste route stacks multiple policy files into a single asset class, from landfill diversion to aviation emissions and industrial heat recovery. That complexity helps diversify revenues but adds permitting and counterparty management, since municipalities, offtakers, and financiers all have different risk thresholds. Project finance will look for long contracts on waste supply, clarity on gate fees, and creditworthy fuel buyers willing to sign multi year offtakes indexed to carbon prices. Public lenders can sharpen terms, but developers still need process guarantees and construction wraps to clear investment committees.
The Harvard team stresses institutions and coordination as much as chemistry. “This study presents a blueprint for converting urban waste into sustainable aviation fuel,” the authors note in a summary from the Harvard China Project.
For Canada, the near term test is whether municipal waste streams, provincial permitting, and federal incentives can align to finance plants that run reliably at scale. If that alignment holds, waste contracts and stable policy could turn trash into a funded aviation fuel supply chain.