Question to the Department for Energy Security & Net Zero:

To ask His Majesty's Government what assessment they have made of the comparative energy conversion efficiency of onshore and offshore wind turbines.

The Department has internal software tools that it uses to model the performance of a specific wind turbine located in a defined location since the comparative energy conversion efficiency depends on the turbine design and the available wind resource rather than if a turbine is used offshore or onshore. The maximum energy conversion efficiency is theoretically 59.26% (The Betz Limit), but practical turbines have efficiency factors around the 40% range.