http://www.awea.org/bats-and-wind-energy
In 2003, Bat Conservation International, the U.S. Fish and Wildlife Service (USFWS), AWEA, and the Energy Department’s National Renewable Energy Laboratory jointly formed the Bats and Wind Energy Cooperative (BWEC). BWEC is actively researching the issue of bat interactions with wind turbines and investigating several promising techniques, such as acoustic deterrents and potential operational changes to wind turbines, with the ultimate goal to reduce bat impacts at wind farms. The wind industry voluntarily studies and mitigates for wildlife impacts, more than any other energy industry, including for wildlife not protected by federal law. This is demonstrated by the inclusion of bats not otherwise protected under federal law in the recommended siting practices outlined in the U.S. Fish and Wildlife Service's "Land-based Wind Energy Guidelines," and guidelines include information on pre- and post-construction studies and analysis related to bats.