The UK is developing a revenue certainty mechanism to support domestic production of sustainable aviation fuel and reduce the investment risk associated with emerging production technologies.

Designed to work alongside the UK SAF mandate and existing funding measures, the mechanism is intended to provide greater long-term predictability for producers and investors. Its structure will influence how quickly non-HEFA technologies can scale, how future SAF supply is sourced, and how the UK market develops beyond the current reliance on imported fuels.

This article examines how the mechanism is expected to work, how it fits into the wider UK SAF policy framework, and how the UK approach compares with support available in the EU. It also considers the likely implications for future fuel supply and the potential links between SAF and biomethane markets.