About Wind turbine blades attacking birds
Do wind turbines kill birds? Yes — but only a fraction as many as are killed by house cats, buildings, or even the fossil fuel operations that wind farms replace.
Do wind turbines kill birds? Yes — but only a fraction as many as are killed by house cats, buildings, or even the fossil fuel operations that wind farms replace.
A year ago, a Golden Eagle approaching the Glenrock/Rolling Hills wind farm in Wyoming might have seen a dangerous optical illusion: A turbine’s blades, spinning at more than 150 miles per hour, would appear not as solid objects to be avoided, but as a blur the bird could fly through.
The study, published last month in the journal Ecology & Evolution, found that the turbines with one black blade killed 71.9 percent fewer birds than standard turbines on the same wind.
Recent research in Norway documented a nearly 72% decline in turbine blade-related bird collisions as a result of painting one turbine blade in black. Painting blades is thought to visually disrupt what otherwise may appear to the bird as a uniform airspace, making the turbine more visible and helping trigger avoidance behavior.
Twenty-eight wind turbine blades have recently been painted black at a wind farm near Glenrock, Wyoming, operated by PacifiCorp, a key partner and lead on the project. The study aims to determine the effect of painted blades on reducing fatality rates among eagles, other birds, and bats.
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