What about ‘shadow flicker’?
Shadow flicker can occur inside a building when the sun shining through a wind turbine’s rotating blades creates a rotating shadow on the ground, which causes a flickering effect if the shadow passes across a window into a building. The adverse effects of shadow flicker from large commercial-scale wind turbines is one of nuisance, but there are no associated adverse health effects
Certain weather conditions are required in order for shadow flicker to occur:
- The turbine must be close enough to a building for its shadow to be cast over the building
- The sun must be low in the sky, with no clouds
- The sun, turbine and window must be lined up so that the rotating blades cast a shadow on the window
The potential for shadow flicker must be considered as part of the pre-planning environmental impact assessment. Shadow flicker is predictable, and a turbine can be programmed to shut down if this is required.
A full report has been commissioned to identify the potential flicker, and glare.