Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, if he will set out the (a) review process and (b) changes for the greenhouse gas conversion factors for (i) bioenergy (ii) well-to-tank bioenergy each year since 2015.

A proportionate risk-based approach is taken to reviewing and updating conversion factors, considering size of UK emission among other factors. As part of the annual peer review process, priority improvements for each year are advised by a Steering Group, consisting of Government officials, consultants and other key data providers. The Steering Group collate feedback and identify potential improvements from regular users of Conversion Factors from across industry and academia.

The conversion factors for fuels and well-to-tank fuels have been reviewed since 2015. All changes to direct and well-to-tank conversion factors for fuels and bioenergy in each year are available from the collection webpage. Conversion factors for natural gas, diesel, petrol and coal are updated regularly, including in the 2024 publication.