Question to the Department for Business, Energy and Industrial Strategy:

To ask the Secretary of State for Business, Energy and Industrial Strategy, with reference to his Department’s published estimates of levelized cost of electricity generation, which formulae are used to model (a) the decline of an individual windfarm's output and (b) the change in an individual windfarm's annual operating costs over its operational lifetime.

Currently the Government does not model degradation of wind turbine output nor changes in operating costs with time, but instead uses lifetime average values to calculate mean levelised cost of electricity.^[1]

^[1]https://www.gov.uk/government/collections/energy-generation-cost-projections