Stealth wind turbines developed to avoid radar confusion

http://www.gizmag.com/stealth-wind-turbine-invisible-to-radar/13260/

Plans for the installation of wind farms the world over are being
delayed or abandoned due to objections from the aviation community or
air defense interests. The problem is that when it comes to low flying
aircraft or wind turbines, conventional radar has a bit of an identity
crisis - not being able to tell the difference. Recent tests in the
U.K. of "stealth" turbine technology could provide a solution.