Studies routinely show that wind power has the lowest impact on wildlife and their surrounding habitats of any way to generate large amounts of electricity. In fact, wind causes less than 0.01% of all human-related bird deaths. Exponentially larger sources in include tall buildings and cars. That's why groups like the National Audubon Society support responsibly sited wind farms: (Commenters Link)
Wind turbines also almost never impact bald eagles, with only a handful of examples in the four decade history of the U.S. wind industry. The US Fish and Wildlife Service's (USFWS) eagle permit rule is grossly mis-characterized in this letter. From former USFWS Director Dan Ashe:
“The truth is, thousands of eagles die every year for a variety of reasons — most from natural causes. The vast majority of human-caused deaths result from intentional poisoning and shooting — federal crimes that we aggressively investigate and prosecute. Most other eagle deaths are caused by collisions – with cars, buildings, power lines and other structures. Wind energy facilities represent a fraction of these deaths, and the media’s singular focus on wind turbines is a gross distortion of the truth.”
"Some have mischaracterized the ceiling of about 4,000 bald eagles cited in our documents as the actual number of bald eagle deaths we intend to permit. In truth, this number represents the maximum number of bald eagles in the lower 48 states (with an equivalent number in Alaska) that our best scientific estimates indicate could be lost annually over and above current mortality rates by any means– both natural and human-caused – without resulting in population declines. The reality is we expect to issue just a few dozen permits annually, most for nest disturbance, some for loss from wind power projects and other sources, such as power lines… The total number of eagle losses we will authorize annually from new sources will be in the hundreds, not thousands, and we believe actual eagle loss will be significantly lower."
-Greg Alvarez, American Wind Energy Association