I work for a renewable energy company. We regularly find dead birds at our wind sites, including occasionally protected species like eagles (killing bats is also a concern).

There are steps you can take to mitigate the threat. We have dumped a ton of money into a really cool technology that scans the skies constantly with super high res cameras and automatically stops turbines in the vicinity of protected species.

Overall, renewable energy is still much better for wildlife than burning fossil fuels.