Question to the Department for Transport:

To ask the Secretary of State for Transport, for what reason there is a Hydroprocessed esters and fatty acids (HEFA) SAF cap within the SAF mandate.

Significant analysis was undertaken during the development of the Sustainable Aviation Fuel (SAF) Mandate. Government considered global production capacity and the UK’s ability to access SAF for a range of SAF conversion processes, including hydroprocessed esters and fatty acids (HEFA). To ensure the SAF Mandate reflects the latest technological and commercial developments, there is continuous monitoring of trends and impacts of the Mandate.

HEFA will play an important role in the global SAF sector, particularly in the early years of the Mandate. However, the HEFA cap is to encourage the development of new technology pathways so that meeting the SAF Mandate is not reliant on HEFA feedstocks, which are likely to become scarcer. We have carefully balanced setting the HEFA cap in a way that recognises the fact HEFA is the only currently commercially available type of SAF to mitigate against unintended consequences.

The corresponding EU SAF Mandate does not place a cap on HEFA, however, the EU’s overarching Renewable Energy Directive does place a limit on certain feedstocks that can be used across transport uses. Officials regularly engage with European counterparts and stakeholders to understand policy developments in the EU and share learnings from SAF policy.