Firefly Green Fuels is an innovative Bristol-based startup focused on the production of sustainable aviation fuel (SAF) derived from treated human waste (biosolids). They use a process called hydrothermal liquefaction (HTL) to convert sewage sludge into crude oil, which is then refined into SAF, while also producing biochar that can be used as a soil fertilizer. This approach helps tackle both waste disposal issues and aviation emissions.

SkiesFifty’s investment strength and expertise helps FireFly fund and guide their future growth, expand operations and target both local and international markets. Firefly plans to build a commercial-scale production facility by 2030, with a demonstration plant set to open by 2027. We also help FireFly build on their strategic partnerships, including collaborations with Boeing and Synagro, to lead the way in sustainable aviation fuel production.