Introduction To Wind -
Wind Farms And Public Acceptance -
Wind Power Around The World -
Economic Data -
Land Values -
Noise -
Noise Standards -
Visual Impact -
Flickering Shadows -
Health -
Wind Farm Syndrome -
Operational Safety -
Aviation & Farming -
Birds -
Tourism -
 
 
 
 
 

To find out more about a specific issue, please type your search topic here.

 

 
   
 
 
 

 

Description: http://www.mtemeraldwindfarm.com.au/images/people_flickering_shadows_1.jpg

 

Shadow flickers breifly as the sun lowers behind the blades.

National Health and Medical Research Council (NHMRC) report 2010:

"It has been suggested that phenomena such as shadow flicker and blade glint could have effects on health. Shadow flicker describes the flicking on and off of the wind turbine's shadow as the blades rotate. The primary concern with shadow flicker is the potential to cause epileptic seizures. The evidence on shadow flicker does not support a health concern."

Blade glint happens when the surface of wind turbine blades reflects the sun's light. All major wind turbine blade manufacturers coat their blades with a low reflectivity treatment which prevents reflective glint from the surface of the blade. The risk of blade glint from modern wind turbines is considered to be very low.

The intensity (or darkness) of a shadow reduces the further it travels from its source until it is no longer noticeable.
Recognised guidelines indicate the maximum distance a shadow cast from a wind turbine is noticeable is around 1.5km.

Any flicker phenomenon can be easily studied, predicted, and mitigated through suitable wind farm siting and design.