When protected birds die at your wind farm or on your lines

In short: Wind turbines kill eagles, kites and vultures, and power lines electrocute them. For an operator, a single protected bird can mean a criminal case, a shutdown order, a forced retrofit or lost generation. At wind farms, the usual way out is restricting when the turbines may run: daytime stops for whole breeding seasons, painful losses of production, and frequent halts that wear down the machines. bAWARE takes the opposite approach: instead of stopping the turbines, it makes the birds turn away. It is a tag worn by the bird that warns the bird itself before it reaches a turbine or a live power line, so that the collision or electrocution is avoided, and it records where and when each danger was avoided. It is designed for the rare, protected, wide-ranging raptors whose deaths put permits at risk.

Part 1 — Wind farms in operation

Why raptors collide with turbines

The blade tips of large modern wind turbines reach 100 metres per second, as fast as a Formula 1 car at full speed. The hub looks slow; the tip crosses any given metre of air in about a hundredth of a second. A raptor hunting with its eyes on the ground does not see it coming.

Birds of prey are the bird group most vulnerable to wind-farm collisions worldwide: they are large, soar at rotor height, and breed slowly, so every adult lost weighs heavily on the population [1]. In the United States alone, wind turbines kill an estimated 140,000–328,000 birds a year [2], and at least 85 bald and golden eagles were found dead at 32 wind facilities between 1997 and 2012, a count the authors call an underestimate [3]. At Smøla in Norway, 133 white-tailed eagles were found killed by turbine blades between 2005 and 2023 [4].

Cases: running wind farms stopped, fined or put under conditions

The pattern: once turbines stand, the risk is open-ended. Daytime stops last whole breeding seasons and come back every year while the birds are there, and court cases run for years in both directions.

What regulators require of a running wind farm

• Germany: the Federal Nature Conservation Act lists 15 collision-sensitive breeding birds, including red kite, white-tailed eagle and golden eagle, and sets how much yield an operator can be required to give up for their protection: up to 6 % of annual energy yield, or 8 % at the best wind sites [20][21].

• United States: since 2024, wind farms can obtain general eagle permits with fees, carcass-reporting rules and compensatory mitigation; finding a fourth eagle of one species ends eligibility for future general permits [22][23]. US prosecutions for accidental bird deaths relied mainly on the Migratory Bird Treaty Act [24]; in April 2025 the Interior Department went back to its 2017 view that the Act does not prohibit accidental killing [25]. Eagles remain protected by a separate law [26].

• France and the Netherlands: as the cases above show, prefects, provinces and courts impose daytime stops, nest surveys and detection systems on farms that are already running [7][5][9].

What options wind farms had so far, and where their limits are

• Shutdown on demand by human observers works: in southern Spain, stopping individual turbines when griffon vultures approached cut vulture deaths by 92.8 % over 13 years, at a cost of 0.51 % of annual generation, from about 6,700 stops a year [27][28]. At Kipeto in Kenya, turbines stop about 1,000 times a year for vultures [29]. It needs people watching, by day, at every site.

• Camera-based detection such as IdentiFlight sees eagles at up to about 1 km [30]. A study at a Wyoming wind farm reported 82 % fewer eagle deaths [31]; a reanalysis of the same data found far weaker evidence [32], which the original authors dispute [33]. A system costs around €300,000 or more [34]. Its reach ends at the camera's line of sight.

• Painted blades: one black blade cut deaths by 71.9 % at four turbines on Smøla, a small sample the researchers asked to be replicated [35]; a larger Dutch trial found no significant effect [36].

All of these act from the turbine's side, and almost all of them protect the bird by stopping the rotor. Every stop costs generation, and frequent stops are hard on the machine: a utility-scale rotor needs tens of seconds to brake gently, and its brakes and drivetrain are not designed for full stops several times a day, every day of the breeding season (bAWARE engineering analysis). The Spanish vulture programme above needed about 6,700 stops a year [27]. Camera systems add a further limit: at about 1 km of detection range and typical raptor travel speeds, they have roughly a minute to identify the bird and bring the rotor down. Operators hate both: the lost production and the constant halts.

Part 2 — Power lines in operation

When a bird touches two energised parts on a pole, or an energised and an earthed part, at the same time, the current kills it and can trip the line [37]. Sometimes the burning bird falls into dry grass and starts a fire [38]. Around the world, roughly one bird is electrocuted every three seconds, about 10 million a year [39]. In the United States alone, power lines kill an estimated 12–64 million birds a year by collision and electrocution [40].

What bird electrocutions cost a utility

• Outages. Bird-caused outages reduce reliability and raise the cost of delivering power [37]. In a study of US distribution utilities, animals caused 7.5–9.6 % of outages between 1993 and 1997, at a cost the authors put at $46.8 million a year and called "probably low" [41].

• Fires. Researchers found reports of 44 wildland fires started by bird electrocutions in the contiguous United States between 2014 and 2018 [42]. In Spain, animals started 30 of the 2,788 power-line fires recorded between 2000 and 2012, at an estimated cost of €7.6–12.4 million [43].

• Legal exposure. Where the birds are protected, electrocutions lead to prosecution, fines and court-ordered retrofits, as the cases below show.

Cases: grid operators prosecuted or ordered to act

Most electrocutions never reach the outage log

Only a minority of electrocutions trip a line: fewer than 10 % in the studies summarised by the Raptor Research Foundation [38], and 16 % in a set of 612 eagle electrocutions in the western United States [37]. A utility's fault records therefore show only a fraction of the birds that die on its poles.

What works on power lines, and where it runs out

Bird-safe design and retrofits for dangerous existing poles are the foundation, and they work where they are done [38]. Marking lines with bird diverters halves collisions on average [50]; Spain's transmission operator marked more than 500 km of high-voltage line for over €2 million [51]. For a utility's own reliability, retrofitting is the right tool: it protects the specific poles that cause the outages, whichever bird or animal touches them. That is how most retrofit programmes are justified, and we support them.

The limit is scale and cost. Published retrofit costs range from an average of €400 per pole in Andalucía's programme [52], through roughly €850–3,000 per pole in Spanish utility and NGO figures [53][54], to the $7,500 per pole that the US Fish and Wildlife Service assumed in its eagle-permit analysis [55]; a retrofit often requires switching the line off [56]. The material need not be the expensive part: Mongolia's national programme retrofitted more than 30,000 poles at an equipment cost of under $40 a pole [57]. Retrofits also need looking after: after more than ten years, degraded insulation was linked to higher electrocution rates than on poles never corrected [58]. And the network keeps growing: the world had almost 80 million km of lines and cables in 2021, 93 % of it distribution network, where most electrocutions happen, and needs to add or refurbish over 80 million km more by 2040 [59].

Retrofitting the poles is right, and we support it. But it cannot keep pace with construction, and it cannot follow a migrating bird across a border.

What the way back looked like

Where the cases above have been resolved, the same elements recur:

• On power lines: fixing the poles that killed the birds. Retrofits were part of the outcome at Moon Lake and PacifiCorp [44][45]. Under the US general eagle permit for power lines, a utility must retrofit within a year of every eagle electrocution it finds [22].

• A documented plan. An avian protection plan at Moon Lake [44], an eagle management plan at ESI [15], a line-adaptation project in Spain [47], a protected-species derogation at Aumelas [9].

• Permits for what cannot be avoided. ESI had to apply for eagle permits for 50 facilities [15]. Under US eagle permits, the approved ways for wind operators to offset eagle deaths are power-pole retrofits and lead abatement [23].

• At wind farms: restricting when the turbines may run. Seasonal daytime stops at Aumelas and Angrie [9][7], turbine shutdowns when eagles are likely at ESI [16].

• Detection at turbines. At Kreekraksluizen, daytime operation can resume only once a bird-detection system slows the rotors when an eagle approaches [6].

Where bAWARE fits

bAWARE works to allow co-existence of energy infrastructure and endangered birds. Instead of curtailing the construction or usage hours of green energy generation, the birds learn to avoid the danger. We anticipate the scientific field studies to prove the effectiveness of the technology. Raptors being few with large territories, even in less endangered species, the math is favourable: for certain rare species with large territories, it is a lot easier to make a few animals safe than the entire human infrastructure.

Till all infrastructure is safe, bAWARE saves the rarest of victims

On power lines

The tag senses the electric field of live conductors and warns the bird, first with a sound and then, if it keeps coming, with a harmless electro-tactile stimulus that discourages the approach. bAWARE warns only the bird that wears it. It will not remove bird-caused faults across a whole network, most of which involve common species that nobody will fit with a tag. Its value to a utility lies where a few large birds of a protected species keep meeting its lines. Those are the deaths that bring prosecutions, permit conditions and headlines out of all proportion to their number: in Spain, a single electrocuted imperial eagle cost a utility more than €140,000 in fines and compensation [46].

Combined with a GPS tag, each warning also records where a tagged bird approached a live line. Over a season, that adds up to a list of the poles the birds actually use: a retrofit priority list drawn by the birds themselves.

At wind turbines

Turbines do produce electric fields, but they are far too weak for the bird's sensor: the generator voltage is not yet stepped up to network voltage, and with today's huge rotors the bird is far from the electrical parts. So at turbines bAWARE works differently: the tag stores the positions of the turbines as a no-fly-zone hazard map, knows its own position, and warns the bird when it approaches, with the same sound and stimulus it uses at power lines. The bird turns away; the turbine keeps turning.

That is the point: bAWARE does not stop the turbine. No lost production, no daytime stops, no wear from frequent halts. The tag works on its own, on the bird, wherever the bird flies, including when it migrates across many wind farms. What the operator buys is certainty: evidence that the protected birds avoid the turbines by themselves.

Systems mounted on the turbine that try to warn or scare birds away, rather than stop the rotor, struggle with reach and with identifying which bird is approaching. A warning carried by the bird itself has neither problem: it knows which bird it is on, and it goes wherever the bird goes.

The bird's positions and reactions reach the bAWARE backend and, from there, the scientists who study the species. They could be shared with the operator, but the system does not depend on it, and it is not built to tell operators when to shut down.

Proof that the danger was avoided

Combined with its localization (e.g. GPS) and data transmission capabilities (e.g. LTE), bAWARE records where and when a protected bird approached a live line or a turbine and how it reacted and avoided the danger. It is designed to prove a corrective plan showing birds turning away and counting the birds that lived, instead of only a reduction in the number of birds found dead.

Where it fits best: a protected raptor that keeps meeting the poles or turbines of an operator, whether a resident breeding pair or birds migrating across many wind farms: the situation behind most of the cases above. Where it does not: species nobody will tag.

The two approaches have opposite blind spots. That is exactly why both are needed.

What to expect today (October 2026)

Sensor, electro-tactile stimulus and release now work in prototype, repeatedly, on real power lines and on live birds. The sensor has been tested many times on real lines in the Pyrenees since March 2026, on 20 kV wooden poles and 63 kV lattice towers. 20 kV is the worst case: lowest voltage, thinnest cable, lowest hang. Detect that and you detect everything. The integrated system now needs controlled field trials and quantified proof. Geofencing, warning an animal from its known position against a stored map of no-go zones, is a tried and tested technology; it will work because bAWARE's actuators are working. Pre-series tags will be available in 2027. So the realistic role for bAWARE in a corrective plan today is a controlled field trial, run with scientific partners, with the species at the centre of your case.

Tell us about your case

If bird deaths have put your permit, licence or financing at risk, or your wind farm or network lies in the range of a protected raptor, tell us about it through the contact page and ask about a controlled field trial with the species concerned. What we need from field partners is described under “Who we are looking for”.

Related: Permits and bird protection · The methods compared · FAQ

Frequently asked questions

Can bAWARE replace pole retrofitting or turbine shutdown systems?

It depends. Retrofitting and shutdown systems protect every bird at a given pole or turbine. bAWARE protects the individual birds that wear it, wherever they fly. Where the whole issue is a handful of breeding raptors near a line or a wind farm, tagging them is a fully viable alternative: with territories this large, there are few birds to tag. In general, the two approaches have opposite blind spots, which is why both are needed.

Which birds is bAWARE for?

Rare and protected birds of prey, or similar large birds, of about 800 g and above, where every individual matters to the population: eagles, kites, buzzards, vultures and large falcons. Those that gain most are the species most likely to perch and hunt from poles, such as buzzards. It is not a product for every bird.

Can bAWARE help when a regulator has ordered turbines stopped?

Yes. While it cannot promise a regulator's decision, it can add protection for the specific birds at the centre of the case, and a record of every danger avoided, as part of a corrective plan, starting with a controlled field trial.

How does it detect power lines and turbines?

Power lines by sensing the electric field of live conductors, tested on 20 kV and 63 kV lines. Turbines through geofencing: the tag knows its position and carries a stored map of turbine positions. The electric fields of turbines are too weak to sense at a safe distance.

Is the stimulus harmful to the bird?

No. The stimulus is harmless and is designed to discourage the approach. Safety for the tagged bird is one of the two equal aims of the planned field trials.

Is bAWARE available?

Pre-series tags will be available in 2027 for controlled field trials with partners.

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