A new study published in the journal Ecology and Evolution shows that painting one blade on a wind turbine black may reduce bird deaths at wind farms by up to 70%. For a long time, organizations, such as the Royal Society For The Protection of Birds (RSPB), have been championing for more care when it comes to setting up wind power plants to avoid the deaths of birds through collisions. This study could reveal a simple solution.
Although wind farms provide one of the cleanest sources of energy, they are tainted by the effects of the turbines on birds. It is common for birds to collide with the turbines and die on the spot. The study now shows that if the blades of turbines are painted black, the rate of accidents could greatly decrease. The study was conducted off the coast of Norway; the location is home to the Smøla plant, where six to nine white-tailed eagles are killed annually.
According to Roel May, researcher at the Norwegian Institute of Nature Research and one of the authors of the study, wind power negatively impacts wild bird populations. “Collision of birds, especially raptors, is one of the main environmental concerns related to wind energy development,” May said.
The main purpose of the study was to find out if there are any mitigating measures that could reduce the collisions. The researchers found that if one of the main rotor blades is painted black, it reduces the motion smear, making the blades visible to birds when they are in motion.
While the findings are promising, the study authors warn that more research still has to be done. The new study provides a platform for more studies to explore the possibility of reducing bird deaths at renewable energy plants.
“Although we found a significant drop in bird collision rates, its efficacy may well be site- and species-specific,” May explained. “At the moment there exists interest to carry out tests in the Netherlands and in South Africa.”
Further studies will need to be carried out in diverse locations to determine the viability of such a move in different areas and on specific bird species. Members of RSPB are also championing for establishing wind power farms in safer locations, where there are no large populations of birds.
Image via Matthias Böckel