To ask the Secretary of State for Communities and Local Government what the meaning is of the measurement ten rotor diameters of a turbine referred to in paragraph 76 of the Planning for Renewable Energy Companion Guide to PPS22; and what guidance has been provided on that meaning. (261877)

Shadow flicker from a wind turbine can be mitigated by siting it at sufficient distance from property likely to be affected. Flicker effects have been proven to occur only within ‘10 rotor diameters of a turbine’. The minimum separation distance to avoid shadow flicker from a wind turbine is therefore derived by multiplying the proposed rotor diameter by 10. The Companion Guide to PPS22 provides a worked example (paragraph 76) and depicts diagrammatically (Figure 5, page 162) the measurement ‘one rotor diameter’.