What is shadow flicker?

Shadow flicker is caused by shadows created by blades rotating in low-angle sun light.  No shadow flicker is cast when the sun is obscured by clouds/fog or when the turbine is not rotating.  Analysis related to flicker is required during project development.  It identifies where and how long any flicker lasts on any given day.  Due to large setback requirements (environmental, residences, noise, etc.) shadow flicker should not impact nearby homes and human activities.