The rotation of turbine blades under the sun can cause a shadow flicker affect. To take place the sun, the wind turbine and a receptor, such as a house or office, must be in alignment.

This necessitates a particularly low sun in the sky to cast a shadow sufficient distance to reach a house some distance away. At long distances the shadow is too weak to be observed. Generally shadow flicker can only affect houses up to 900m away.

The periods when the sun is in the right place in the sky are very limited. It is also necessary that during these times the weather is also sunny. The combined circumstances mean that the effect only takes place for a few houses and only for a few hours each year.

Computer models will be used to pin point the houses and quantify the number of hours where an effect may be seen. The results will be included in the environmental impact assessment. The considerable seperation distances to housing mean a significant affect is not expected.