Building with Earth

www.helixwind.com

http://www.motorwavegroup.com/new/motorwind/

“Motorwind micro turbines can work in wind speeds of only 1m/second. Their light weight, small size, and flexible configuration allows them to be installed in both urban and rural environments, for individual or corporate use.  Motorwind turbines give users a new option for efficient renewable energy and therefore reducing their impact on the environment.”

These seem pretty cool, but they take up a lot of space, are a bit ugly (subjective opinion alert), and it seems that most large installations are not directional (the turbines are always facing the same direction) so it would be highly dependent upon wind direction.