Interesting possible explanation from the media to this incident.
I wonder if advanced cultures have no knowledge of wind turbines; hence the unfamiliarity leading to the impact (though after a few billion miles dodgy asteroids I'd have thought a turbine blade might be easily dodged).
Maybe they looked at the enviROI? Not sure being unable to cope with ice is too encouraging, what with the climate change we're experiencing.
I wonder if the actual reason will be shared? If it is mundane I doubt it.
Gaurdian - UFOs crashing into wind farms: has the Guardian solved the mystery? - QED
Telegraph - 'UFO' turbine debris sent to German forensic scientists
Times - We just can’t get enough of those little green men - best explataion yet as 1st comment to this