Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what the evidential basis is for the (a) assumptions on renewables costs, (b) assumptions on capacity factors and (c) other assumptions in the technical annex to the Electricity Generation Costs 2023 report.

DESNZ regularly reviews its evidence base and commissions research to update cost and technical assumptions where necessary. The costs, capacity factors, and other assumptions presented in Annex A of the Generation Costs Report 2023, are primarily based on the externally commissioned research supplemented by internal evidence as appropriate. These assumptions are clearly described and referenced in the reports. The Introduction page to the 2023 report includes changes in assumptions from the previous report.