Firefly to produce SAF from sewage sludge via hydrothermal liquefaction; signs 525,000‑tonne Wizz Air offtake
UK start‑up Firefly will convert sewage sludge into sustainable aviation fuel using hydrothermal liquefaction, targeting commercial production by 2029. Wizz Air has signed a 525,000‑tonne offtake, marking a major airline commitment to waste‑derived SAF at scale.