Amazon is investing in GranBio’s cellulosic sustainable aviation fuel demonstration plant in Thomaston, Georgia, converting forest residues and construction waste into drop-in jet fuel. The deal extends Amazon’s Climate Pledge investments into another non-HEFA pathway, following earlier Amazon stakes in Twelve (CO2-to-jet) and Infinium (e-SAF).
The investment lands at a moment when HEFA, the waste-fats-and-oils route that IATA expects to account for more than 90% of SAF production through 2028, is bumping against a feedstock ceiling that no amount of refinery capacity can solve. Cellulosic feedstock volumes dwarf US waste-oil supply, but the binding constraint shifts from feedstock to conversion economics, a constraint that shuttered every prior US commercial cellulosic ethanol plant from Abengoa Hugoton to POET-DSM Project Liberty. Amazon’s bet is that GranBio can be the first to crack that economics problem at jet scale.
The Thomaston demonstration site will process forest residues, logging waste, crop stalks, pallets and plywood into renewable diesel, renewable gasoline and SAF that are chemically identical to their petroleum equivalents. Byproducts from the conversion generate the plant’s own process heat. GranBio describes the site as a template for repurposing shuttered US pulp and paper mills, an asset class with steam, water, biomass handling and rail infrastructure in place, although prior pulp-mill conversion projects from Red Rock Biofuels Lakeview to Velocys Bayou Fuels have not reached commercial scale.
“Aviation needs lower-carbon fuel, and the supply doesn’t exist at scale yet. GranBio’s technology has the potential to change that, turning abundant waste materials into drop-in fuels.”
Investment terms were not disclosed. Andreas Marschner, Amazon’s Vice President of Worldwide Operations Sustainability, framed the deal as demand-signal capital aimed at proving that abundant waste materials can become drop-in fuels at scale. Kim Nelson, GranBio’s Chief Technology Officer, said the partnership brings the company closer to proving that SAF made from forest and construction waste can be a real, scalable solution for decarbonizing aviation. Amazon’s Climate Pledge commits the company to net-zero carbon by 2040 across an operations footprint dominated by third-party last-mile delivery, ocean freight and trucking, with aviation a smaller but harder-to-abate slice.
Watch the conversion economics first. If the Thomaston demo proves the unit cost, the next question is which of the country’s idled pulp and paper mills offer the strongest brownfield economics, and whether Amazon’s Climate Pledge capital follows up with an offtake commitment rather than another minority stake. The earlier Amazon positions in Twelve and Infinium have not, to date, translated into facility-scale purchase agreements.
Source: Amazon Sustainability
