Painted wind turbines can dramatically reduce bird deaths, study finds

Wind energy is crucial for combating climate change, yet wind turbines pose a significant risk to bird populations. A recent study has revealed that a simple, cost-effective solution could drastically lower bird collisions with turbines: painting one blade a contrasting color. As wind turbines rotate, their massive white blades can form a motion blur, making them hard for birds to detect—a phenomenon known as motion smear or motion blur.

By disrupting this blur through painting, the turbines become more visible to birds, allowing them to avoid the deadly blades. A long-term experiment conducted between 2020 and 2021 by Acciona Energía, the owner of El Ruedo wind farm in Cadiz, Spain, tested this concept. Four turbines had one of their three rotor blades painted black, while 16 others retained their white blades as controls.

Researchers continuously monitored bird fatalities from 2012 to 2024, before and after painting. The findings showed that painted turbines experienced a near 74% reduction in annual bird fatalities compared to the control group. These results align with similar studies conducted in Norway and South Africa, where painting one blade black or red reduced bird deaths by over 70% and 83%, respectively.

However, despite these promising outcomes, more research is needed to fully understand the long-term impact of this wind turbine modification on bird populations.