New Wind-Farm Distance Guidelines Proposed to Protect the Cinereous Vulture
Researchers urge buffer zones of up to 21 km around nests to reduce collision risk in Portugal
Wind power vs vulture safety
As Europe steps up wind energy deployment to meet climate goals, conservationists warn that infrastructure expansion may conflict with wildlife protection—particularly for sensitive species such as the Cinereous Vulture (Aegypius monachus). A new report from the LIFE Aegypius Return project offers spatial guidelines aimed at reconciling renewable energy development with vulture conservation.
The report, ‘Spatial Guidelines for Safeguarding Cinereous Vulture Colonies from Wind Farm Expansion’, is based on GPS tracking data from 38 juvenile vultures in Portugal between 2018 and 2024. It frames minimum exclusion distances around nests that can reduce mortality risk from turbine collisions.
Recommended safety distances
Under energy-prioritised scenarios, the researchers recommend that wind turbines be installed at least 7.7 km from active nests. This distance safeguards the core area—where half of juvenile time is spent—for about half of the juveniles tracked.
However, to afford stronger protection during the fledgling period—when young birds remain dependent on their parents—the report suggests an exclusion radius as large as 21.3 km. Such a buffer is designed to reduce exposure to turbines during vulnerable periods and in peripheral parts of the home range.
These exclusion zones have already been mapped for all known colonies in Portugal and are intended to help authorities and the wind-energy sector plan new farms in ways that minimise impacts on the species.
Why the Cinereous Vulture is especially vulnerable
The Cinereous Vulture is Europe’s largest bird of prey. In Portugal it is legally protected and listed as Endangered. Its ecology demands wide home ranges and landscapes suited to soaring flight. The breeding season is long: pairs start nesting in January, and the chicks leave the nest around August–September. Even after fledging, juveniles may remain dependent on parental care for some time.
Juveniles during this dependency phase expand their range gradually, but their limited flight and foraging skills render them especially prone to collisions with wind turbines. Mortality among juveniles can severely degrade the reproductive capacity of a colony and jeopardise long-term viability, given the species’ slow life history and low population size.
In the Balkans, studies have already shown that even with high avoidance behaviour (99 %), placing turbines within core breeding areas can result in significant annual vulture mortality, equivalent to 5–11 % of local populations in one year.
Implications and policy uptake
These guidelines are timely: new energy projects are planned near the recently discovered Vidigueira/Portel colony in southern Portugal, a key stronghold away from the Spanish border. Applying the proposed buffer distances is essential to avoid undermining decades of conservation work for the Cinereous Vulture and other species in the region.
The LIFE Aegypius Return project is actively engaging with authorities, energy developers, consultants, and planners—issuing technical opinions and maps to integrate scientific recommendations into decision-making.
While renewable energy expansion is critical to confront the climate crisis, the report stresses that it must not exacerbate biodiversity loss. The proposed exclusion distances, combined with mapping tools and stakeholder outreach, offer a pathway for energy and nature to coexist more safely.
September 2025
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