Question to the Department for Transport:

To ask the Secretary of State for Transport, what estimate she has made of the cost per tonne of carbon dioxide reduction achieved through the Revenue Certainty Mechanism compared to other Sustainable Aviation Fuel pathways; and what assessment she has made of the value for money of this policy for taxpayers.

The Sustainable Aviation Fuel (SAF) Mandate is the UK’s key policy to decarbonise jet fuel, and could deliver up to 6.3 megatonnes of carbon savings in 2040. The SAF Revenue Certainty Mechanism (RCM) will support investment in UK SAF production and delivery of SAF Mandate targets. The relevant greenhouse gas savings have been accounted for in the SAF Mandate’s Cost-Benefit Analysis.

The Government is committed to delivering value for money. The RCM will be funded via a variable levy on aviation fuel suppliers. The Government will actively monitor and control scheme costs, including through the setting of strike prices and by controlling the scale and number of contracts awarded, and it has set out the potential costs and benefits that may arise from the RCM scheme in the Cost-Benefit Analysis, published in May 2025.