Sustainable Aviation Fuel Bill

Paul Kohler Excerpts

2nd reading
Wednesday 11th June 2025 Commons Chamber

[Mr Paul Kohler (Wimbledon) (LD)]

I thank the Secretary of State for her speech, and congratulate the Aviation Minister on the Bill.

The challenge facing the aviation sector—as with our entire economy—is decarbonisation. Reaching net zero by 2050 is essential, and given the scale of the scientific and technical challenge, it is clear that decarbonising aviation will not be easy. Sustainable aviation fuels have an important role to play in this effort. We consequently welcome the establishment of a SAF revenue certainty mechanism, which has long been called for by many in the aviation industry and which, as we have heard, is vital to ensuring that the SAF mandate is both feasible and achievable for airlines. Providing SAF producers with a guaranteed level of revenue will be key to unlocking investment in the sector—which, I think, answers some of the questions posed by the shadow Minister, the hon. Member for Orpington (Gareth Bacon). It will help to stimulate private capital at this early stage, and will support the UK’s ambition to become a global leader in SAF development and production. The growth of the industry also has the potential to generate jobs and economic activity across the country.

However, while my party supports the Bill, there remain important questions, regarding in particular the scrutiny of the mechanism, international alignment, and the wider strategy for aviation decarbonisation. The Bill sets out the broad principles for the revenue mechanism, but leaves much of the detail to secondary legislation and ministerial discretion. That is, to a degree, understandable—the early stage of SAF technology and the uncertainty in market development mean that flexibility is crucial and necessary—but the Government must ensure that Parliament has an adequate opportunity to scrutinise the development of the mechanism, and the SAF sector more broadly. Given the importance of SAF to achieving net zero in aviation, it is vital that the House is updated regularly on progress in the industry, and on whether any adjustments to the mechanism are necessary. That is especially important in the light of previous Government promises to kick-start the domestic SAF industry—promises that have yet to materialise. In 2022 the Conservatives promised to have five commercial SAF plants up and running by 2025, but, as so often, they failed to deliver. I will therefore be pushing in Committee for the Bill to increase the level of ongoing scrutiny.

It is also crucial for the UK to work collaboratively with international partners on net-zero aviation technologies. Currently, the criteria for both what qualifies as SAF and what levels of different technologies should be used differ between the UK and the EU, with each jurisdiction prioritising different fuel types at different times. Given the inherently international nature of the aviation sector, closer regulatory alignment with the EU and other key partners is essential to fostering growth in the industry and ensuring that there are sufficient levels of SAF production internationally to support the transition. The Government must therefore work more closely with the EU and others to ensure that our frameworks dovetail.

Finally, while we welcome this Bill, it is important to acknowledge that SAF alone will not be enough to decarbonise aviation, as the Chair of the Transport Committee made clear. Although SAF can significantly reduce the carbon intensity of air travel, flights using SAF will not be carbon neutral, so many of the necessary emission reductions to reach net zero will need to come from other areas. By the Government’s own estimates, SAF could cut emissions by 6.3 million tonnes of CO₂ equivalent by 2040. That is not insignificant, but given the projected growth in passenger numbers, it would represent only a 0.8% reduction in overall aviation emissions compared with today.

While the Lib Dems support the Bill, we continue to urge the Government to take more ambitious action to decarbonise the aviation industry. With plans for airport expansion still on the table, the Government must clearly articulate how net zero aviation will be achieved by 2050.