Here's a nice link to the question of whether wind turbines kill birds?
Answer: Yes they do, but not as many as are killed by cars, windows, power lines, communications towers, pesticides, cats, both feral and housecats, jet engines, smoke stacks, bridges, and a few other human structures and activities - including one I just remembered: oil well and refinery flares.
It's a tough life, being a bird, but the compensations are enormous: all that flying, free food, and fresh air.
Modern large turbines turn relatively slowly, which has reduced the kill.
Which is not to be complacent. Has anyone tried painting silhouetted raptors on the blades? Might scare off some non raptors - but could be bad for horny single raptors.
Or a directional loudspeaker cold fire off hungry raptor noises when sensors detected approaching birds. Experiments should be designed and carried out.