US-headed global aerospace major The Boeing Company (Boeing), and Clear Sky, a UK-headed investment company dedicated to aviation sustainability, are joining forces to accelerate sustainability solutions for aviation. As an initial project, the companies will help in testing and advancing Firefly Green Fuels Ltd’s cutting-edge technology to increase sustainable aviation fuel (SAF) production in the UK.
Firefly Green Fuels transforms sewage waste feedstock into SAF through hydrothermal liquefaction (HTL). This process uses heat and high pressure to convert waste into biocrude oil and biochar, a powdery substance that can be used as a fertilizer.
According to the company, SAF produced from this abundant yet untapped feedstock can reduce lifecycle carbon dioxide (CO₂) emissions by more than 90 percent compared to traditional petroleum jet fuel.
The Clear Sky-led consortium of investors and strategic partners, including Boeing, will invest an undisclosed amount in Firefly Green Fuels’s new technology, subject to final diligence.
Boeing will provide training, direction, and facilitation on testing that will accelerate the qualification of this new route to SAF.
SAF offers the greatest opportunity to decarbonize aviation, and the industry’s collective challenge of bringing it to scale globally requires new sustainable pathways. Clear Sky combines many years of investment expertise with knowledge on aviation’s decarbonization challenges. Firefly’s technology holds transformative potential as the SAF feedstock, sewage waste, is accessible in all regions of the globe, said Brian Moran, CSO at Boeing.
Currently SAF represents 0.1 percent of global jet fuel use. In the UK the pending mandate to achieve 10 percent SAF in the jet fuel mix by 2030 will require 1.2 million tonnes of SAF by 2030, increasing to 7 million tonnes by 2050, according to ICF’s UK Net Zero Carbon Roadmap.
The Boeing and Clear Sky investment “demonstrates progress on the roadmap” given the available UK sewage waste can meet a significant proportion of the UK’s SAF requirement.
In a world where demand for SAF outstrips available supply, Firefly is paving the way to cost-competitive and globally available fuel. With the support of Clear Sky and Boeing, we are propelling toward our goal of commercial production in the UK by 2029, and rapid replication across the globe, said James Hygate, CEO of Firefly Green Fuels.
In addition to supporting Firefly Green Fuels, Boeing and Clear Sky are embarking on an international investment partnership focused on sustainability solutions that span aviation and adjacent industries such as chemicals and materials.
Areas of focus include SAF, alternative propulsion, carbon removal, and advanced materials and recycling.
Boeing is undoubtedly a leader in advancing aviation’s decarbonization journey. We are delighted to be collaborating with Boeing to scale Firefly with more projects to be announced in the future, said Krishnan Narayanan, Founding Partner at Clear Sky.
