I'm conflicted on this one to be honest.
On the one hand the use of wind power is very effective, clean, and is renewable FOR-EVAH. I happen to work in the power industry currently, so that is a concern.
On the other hand, you are talking about making a species EXTINCT if you don't do something. I'm not for extinct in the terms of something as beautiful, and useful, as an eagle. Now cats, that is a different story altogether.
The blades on a wind turbine in Eastern Washington can spin as fast as 51 miles per hour at the very tip before the limiting controls kick in to keep it from doing damage to itself. The blades are also something like 100-150 feet in length, so we are talking about a serious piece of moving surface that could easily cut a semi truck in half in one swipe.
The downside of wind turbines is that their ideal location are long, flat, grassy areas with little to no obstructions. Great places for birds to hunt as well.
Not only do the blades spin in a clock like rotation, but they rotate on 3 axis as well, so just because it is facing one way today, doesn't mean it will be there again tomorrow. The drafts, upcurrents, downcurrents, etc. are never the same, so the fowls in question really have no way of "learning" to avoid them.
No good solution on this one. Glad I am not involved in any way because I don't know how to vote here.