Answer:
Shadow flicker is the flickering effect caused by the shadows of wind turbine blades as they rotate. The area affected by shadow flicker depends on the location of the wind turbines and the position of the sun. Shadow flicker can cause visual annoyance and discomfort to people living near wind turbines.
Shadow flicker can be mitigated by siting wind turbines at sufficient distance from residences likely to be affected by shadow flicker. Additionally, shadow flicker can be minimized with proper planning and siting. The duration of shadow flicker in hours per year can be calculated using software routinely used in wind energy project design.