Shadow Flicker

This term refers to the shadows cast by wind turbine blades as they rotate in front of the sun, similar to the shadow cast by a tree blowing in the wind. By positioning wind turbines at a carefully calculated angle and distance from dwellings, Apex ensures that most homes in a project experience no shadowing at all. For those that do, shadowing will occur for no more than a few minutes per day, on average. Furthermore, because shadowing effects are weaker as you get farther from a turbine, these effects are often barely noticeable from residences. Shadowing does not occur on cloudy or foggy days. 

Furthermore, while some have claimed that shadow flicker can create risk of seizures in photosensitive individuals ...

“Scientific evidence suggests that shadow flicker [from the rotating blades of wind turbines] does not pose a risk for eliciting seizures as a result of photic stimulation.”

 Massachusetts Department of Public Health, “Wind Turbine Health Impact Study: Report of Independent Expert Panel,” January 2012