Europe is pushing to install 100 gigawatts of offshore wind capacity in the North Sea by 2050, raising urgent questions about the impact of the €9.5 billion Hamburg Declaration on migrating birds. A new pilot study using thermal cameras and artificial intelligence at the Hollandse Kust Zuid offshore wind farm has detected dozens of bird movements at night, capturing empirical collision data that researchers say will help clarify risks to declining species.
Thermal Cameras and Artificial Intelligence Track Migrating Birds at Night
Most research on bird collisions with wind turbines has historically focused on land-based installations. Tracking what happens at sea remains difficult because millions of songbirds cross the North Sea during spring and autumn mostly under the cover of darkness, and remote offshore locations lack lighting.
To overcome this, energy company Vattenfall launched a year-long pilot study at the Hollandse Kust Zuid offshore wind farm. The project was carried out in collaboration with Wildlife Imaging Systems and Wageningen University & Research. Wildlife Imaging Systems installed 16 thermal cameras on an offshore wind turbine. The equipment covered all angles 24 hours a day, using artificial intelligence to detect and interpret bird movements during fog, rain, and pitch-black nights.
“Safeguarding biodiversity is an important part of the energy transition,” says Karen Krijgsveld, a bird ecology researcher at Wageningen University & Research. As Karen Krijgsveld, a bird ecology researcher at Wageningen University & Research, points out, land-based investigations have already provided extensive insights regarding the timing and causes of avian turbine strikes, alongside the specific groups facing the highest danger. “As offshore wind energy continues to expand, we need to develop that same understanding at sea.”
Hollandse Kust Zuid Study Identifies Two Confirmed Collisions
Monitoring spanned nearly a full year to capture both spring and autumn migration seasons. Researchers identified 22 possible bird collisions. Of those incidents, two were confirmed and one was considered highly probable.
According to Jesper Kyed Larsen, a bioscience expert at Vattenfall, calculations regarding offshore bird impacts relied predominantly on theoretical projections prior to this work. “At sea, it’s extremely difficult to verify fatalities because there are no remains to recover.” This project highlights the pathway to gathering real-world metrics required for refining strike projections and implementing effective protective measures.
The study does not claim that collisions are frequent or that these initial findings from a single turbine apply globally. Instead, the primary goal was testing how the technology performs under harsh offshore conditions. Similar results emerged from a separate evaluation by the German Offshore Wind Energy Association. That research analyzed more than four million bird movements across 18 months using radar and AI-enabled cameras, concluding that more than 99.8 per cent of migratory birds reliably avoided the turbines.
Another Vattenfall study examined 2,007 bird flight paths via video recordings at an offshore wind farm near Aberdeen, Scotland, over a 19-month period ending in December 2024. Researchers recorded zero collisions during that timeframe.
Conservationists Warn Endangered Species Remain Vulnerable
Despite data suggesting minimal overall impact, conservation groups emphasize that protective measures remain vital. Ten of the 26 seabird species breeding on UK coastlines and islands are currently listed as endangered.
Mitigation strategies vary widely across Europe. At the land-based Smola wind farm in Norway, operators painted a single blade on each of its 68 turbines black to increase visibility. That initiative reduced avian fatalities by 70 per cent, dropping recorded carcasses from 11 down to six. However, critics argue that highly visible turbines can disrupt migration pathways, forcing birds to fly longer detours that deplete the energy reserves they need to feed their chicks.
Other protective approaches include placing turbines far away from sensitive habitats and avoiding major migration corridors entirely. Developers also deploy thermal cameras and radar systems to continually evaluate local risks.
Europe Expands Offshore Wind Capacity Across Ten Nations
Europe currently has more than 30 gigawatts of installed offshore wind capacity, generating enough electricity to power over 26 million homes annually. The Hamburg Declaration aims to scale this output by pooling resources across ten nations in the North Sea.
Frequently Asked Questions About Offshore Wind Farms and Birds
How do researchers track bird movements at offshore wind farms at night?
Researchers deploy networks of thermal cameras mounted directly onto wind turbines. Combined with artificial intelligence software, these camera systems monitor and record flight paths 24 hours a day, even in heavy fog, rain, or total darkness.
What percentage of migratory birds avoid offshore wind turbines?
Data from the German Offshore Wind Energy Association, which analyzed over four million bird movements across 18 months using radar and AI cameras, indicates that more than 99.8 per cent of migratory birds successfully avoid wind turbines.
What measures have developers tested to reduce bird collisions?
Operators have experimented with painting a single turbine blade black to increase visual contrast, an initiative that reduced fatalities by 70 per cent at Norway’s Smola wind farm. Other safeguards include siting turbines away from sensitive habitats and using radar to monitor seasonal migration pathways.
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