... there are other options for viable wind turbines that are claimed to be bird- and bat-friendly, including the Catching Wind Power (CWP) device, which will soon be tested, improved upon, and manufactured by Sigma Design.
The CWP Compressed Air Enclosed Wind Turbine is the brainchild of 89 year old Raymond Green, who invented and patented his unique version of wind power generator. Green believes these units can be manufactured in sizes ranging from small personal-use/portable units up to massively sized units that can be installed at wind farms, and that they hold significant advantages over traditional turbine designs.
According to the Green's website,
"Traditional three blade turbines knock the birds out of the sky because the birds can not see the massive, spinning, blades that turn between 80mph and 190mph, therefore hitting them and knocking them to the ground, killing them. Our design does not have any external moving parts to hit the birds. Our unit is easy to see so the birds can avoid it, and all moving parts are internal. The blades are mounted behind the windsock and inner compression cone, therefore making them nonaccessible to birds. Also, our turbines make virtually no noise."