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Documents presented here are not the product of nor are they necessarily endorsed by National Wind Watch. These resource documents are provided to assist anyone wishing to research the issue of industrial wind power and the impacts of its development. The information should be evaluated by each reader to come to their own conclusions about the many areas of debate.

Date added:  March 25, 2017
North Dakota, South Dakota, WildlifePrint storyE-mail story

Effects of wind-energy facilities on breeding grassland bird distributions

Author:  Shaffer, Jill; and Buhl, Deborah

Abstract: The contribution of renewable energy to meet worldwide demand continues to grow. Wind energy is one of the fastest growing renewable sectors, but new wind facilities are often placed in prime wildlife habitat. Long-term studies that incorporate a rigorous statistical design to evaluate the effects of wind facilities on wildlife are rare. We conducted a before-after-control-impact (BACI) assessment to determine if wind facilities placed in native mixed-grass prairies displaced breeding grassland birds. During 2003–2012, we monitored changes in bird density in 3 study areas in North Dakota and South Dakota (U.S.A.). We examined whether displacement or attraction occurred 1 year after construction (immediate effect) and the average displacement or attraction 2–5 years after construction (delayed effect). We tested for these effects overall and within distance bands of 100, 200, 300, and >300 m from turbines. We observed displacement for 7 of 9 species. One species was unaffected by wind facilities and one species exhibited attraction. Displacement and attraction generally occurred within 100 m and often extended up to 300 m. In a few instances, displacement extended beyond 300 m. Displacement and attraction occurred 1 year after construction and persisted at least 5 years. Our research provides a framework for applying a BACI design to displacement studies and highlights the erroneous conclusions that can be made without the benefit of adopting such a design. More broadly, species-specific behaviors can be used to inform management decisions about turbine placement and the potential impact to individual species. Additionally, the avoidance distance metrics we estimated can facilitate future development of models evaluating impacts of wind facilities under differing land-use scenarios.

Efectos de las Instalaciones de Energía Eólica sobre la Distribución de las Aves de Pastizales en época Reproductiva

Resumen: La contribución de la energía renovable para cumplir con las demandas mundiales sigue creciendo. La energía eólica es uno de los sectores renovables con mayor crecimiento, pero continuamente se colocan nuevas instalaciones eólicas en los principales hábitats de fauna silvestre. Los estudios a largo plazo que incorporan un diseño estadístico riguroso para evaluar los efectos de estas instalaciones sobre la fauna son escasos. Realizamos una evaluación de control de impacto de antes y después (CIAD) para determinar si las instalaciones eólicas colocadas en praderas de pastos mixtos nativos desplazaron a las aves de pastizales en época reproductiva. Durante el periodo 2003-2012, monitoreamos los cambios en la densidad de aves en tres áreas de estudio en Dakota del Norte y del Sur (E.U.A). Examinamos si había ocurrido desplazamiento o atracción un año después de la construcción (efecto inmediato) y también el promedio de desplazamiento o atracción 2-5 años después de la construcción (efecto retardado). Analizamos estos efectos en general y dentro de franjas de distancia de 100, 200, 300 y >300 m de las turbinas. Observamos desplazamiento en siete de las nueve especies. Una especie no fue afectada por las instalaciones eólicas y una especie mostró atracción. El desplazamiento y la atracción ocurrieron generalmente dentro de los 100 m y frecuentemente se extendieron hasta los 300 m. En algunos casos, el desplazamiento se extendió más allá de los 300 m. El desplazamiento y la atracción ocurrieron un año después de la construcción y continuaron durante por lo menos cinco años. Nuestra investigación proporciona un marco de trabajo para aplicar el diseño CIAD a los estudios de desplazamiento y resalta las conclusiones erróneas que pueden hacerse sin el beneficio de adoptar dicho diseño. En términos más generales, los comportamientos específicos de especie pueden usarse para informar a las decisiones de manejo sobre la colocación de turbinas y el impacto potencial para las especies individuales. Además, las medidas de distancia de evitación que estimamos pueden facilitar el desarrollo futuro de los modelos de evaluación de impacto de las instalaciones eólicas bajo escenarios diferentes de uso de suelo.

Jill A. Shaffer and Deborah A. Buhl
U.S. Geological Survey, Northern Prairie Wildlife Research Center, Jamestown, ND, USA

Conservation Biology, Volume 30, No. 1, 59–71
Published 2015. This article is a US Government work and is in the public domain in the USA.
DOI: 10.1111/cobi.12569

Download original document: “Effects of wind-energy facilities on breeding grassland bird distributions”

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Date added:  March 24, 2017
Environment, Maine, WildlifePrint storyE-mail story

Audubon letter: wind turbines near Monhegan Island, Maine

Author:  Maine Audubon and National Audubon Society

[To:  Diana Heyder, NEPA Division, U.S. Department of Energy]

… First of all, we would like to request a more formal and detailed Environmental Impact Statement (EIS), as was proposed when a similar project was first evaluated in 2012 (Docket No. BOEM-2012-0049; FR Doc. 2012-19592 Filed 8-9-12; 8:45 am; BILLING CODE 4310-VH-P). That project was sited almost 20 miles away from Monhegan Island, which is a vital stopover for migrant landbirds. Based on current knowledge of the environmental issues surrounding this site, concerns about the current proposal (see bottom of page two for a list of specific issues), and the project’s proximity to Monhegan Island, we believe the only possible outcome of an EA will be a finding of significant impact on the human environment. The expanded opportunity for public comment on an EIS as well as the more detailed discussions of the affected environment, of the alternatives, and of the environmental impacts and mitigation for such impacts is critical for a project of this scope and nature. Please consider an EIS for this project in place of the EA.

Generating energy from offshore wind is potentially a promising opportunity for Maine and elsewhere in the US, and National and Maine Audubon support developing renewable energy sources as long as they are sited in a way that minimize risks and impacts to wildlife and wildlife habitat. However, we know very little about how wildlife species use Maine’s coastal and offshore waters; for example, we do not know the location of foraging sites for most seabird species, including endangered Roseate Terns, bird and bat migration routes, behavioral responses to turbine activities, and the indirect and direct risks posed by offshore wind power development. Even if passing migrants avoid collisions with turbines, as has been observed at some wind sites in Europe, indirect impacts through avoidance behaviors and habitat alterations may cause cumulative damage to sensitive species. It is essential we have a greater understanding of how wildlife uses the area around the test site before permits for any turbines are issued.

Our greatest concerns about possible impacts to wildlife from the turbines include:

We strongly recommend the following be addressed in the proposed site’s EIS or EA:

We also have the following specific concerns about this project, giving us further reason to request a full Environmental Impact Statement before determining whether to issue a permit:

  1. The initial assessments regarding potential effect on wildlife (e.g. radar studies of bird and bat use) done for the original proposed deployment at Monhegan are not applicable to the currently proposed work. The initial project was for a single, small (< 100 ft, including rotor swept area above the spar) turbine to be deployed for 4-6 months at a time. The current project proposes two much larger turbines (each with a 495’ rotor diameter) to be deployed continuously for up to five years. The current proposal also involves multiple sites for construction of the anchoring/platform system and installation of the ‘submarine’ cable to the mainland.
  2. Observations from the Maine Department of Fisheries and Wildlife biologists and the local birding community indicate that the area around Monhegan Island is one of Maine’s most important high use areas for the state endangered Peregrine Falcon and other raptors during migration. Raptors and falcons in particular are likely extremely susceptible to collision to lighted structures during inclement weather situations (NRC 2007).
  3. Monhegan Island itself is also one of Maine’s most critical stopover sites for landbird migrants using coastal waters as a flight route north in the spring, including endangered/threatened species, species of special concern, and boreal species that have been particularly hard hit. Over 250 species have been reported on the island in the last five years, and Monhegan Island has been nominated as an Important Bird Area for Maine. The potential impact to a broad range of migrant songbirds, many of which are already in decline, is a big concern of Audubon organizations both within the state and across the region.
  4. Both the indirect as well as direct effects on habitat and wildlife for all stages of the project, including construction, deployment, operation (maintenance, data collection), and decommissioning are of grave concerns to both National and Maine Audubon. The investment of the cable to the mainland would mark a major commitment and incentive to expand the project in the future. The effects on wildlife and commercial fishing would be greatly increased with an enlarged project.
  5. Construction of the floating platforms at the Hampden site brings increased risk to disturbing an area well known for mercury contamination. This brings increased risk of releasing mercury into the food chain, including threats to Atlantic salmon, alewives, and the marine food web.
  6. Increased boat traffic, barges, etc. may cause habitat displacement for birds and other wildlife throughout the entire project (minimum of 5+ years).
  7. The underwater footprint will have an effect on the ocean floor both in installation and ongoing risk to diving birds such as gannets that may be attracted to schools of fish that use the installation as an underground reef. Migrating whales face similar risk.
  8. Radar work associated with the original proposal for smaller blades showed that significant numbers of birds and bats would be at risk. The new project, with a sweep area of blades nearly five times larger would pose significantly larger risk. The effect of two large blades only 2.5 miles from Monhegan Island we believe poses a significant threat to one of the most important migratory stopover locations on the Atlantic coast for landbirds. Likewise, the sweep elevation clearly makes the blades a threat to seabirds such as gannets and terns. Half of Maine’s federally endangered Roseate Terns nest on Eastern Egg Rock, less than eleven miles away- a distance well within the known foraging range of the species.
  9. Finally, the proposal does not include any ongoing monitoring of pollution caused during the construction or follow-up monitoring of incidental kill or even use of the actual project site(s).

Following is some additional background information about the importance of the project area to a suite of wildlife species.

Gulf of Maine Background:

The Gulf of Maine is an internationally significant and essential coastal resource for a variety of wildlife species including federally listed species (Roseate Tern & Piping Plover, northern right whale, humpback whale, finback whale), state listed species (Least Tern, Arctic Tern, Harlequin Duck, Razorbill, Atlantic Puffin, Barrow’s Goldeneye, Great Cormorant, Peregrine Falcon) and species of concern or in decline (e.g. Common Tern, Common Murre, Leach’s Storm-petrel, Red-necked Phalarope, Semipalmated Sandpiper, Bonaparte’s Gull, Laughing Gull). It also is an essential link in the Atlantic migratory pathway, and millions of shorebirds, songbirds, waterfowl, raptors, and other birds pass along the Maine coast and through Gulf of Maine waters during spring and fall migrations.

Unlike many of the areas in Europe with existing offshore wind energy sites, the Gulf of Maine is dotted with thousands of islands along the coast. A total of 377 of Maine’s 4,500 islands (8% of all islands in Maine) are considered important habitat for seabird nesting. Forty-seven of these islands have been recognized as Important Bird Areas, part of a global effort to identify the most critical habitats for long-term bird conservation within each state and across the globe. Our coastal waters are the only nesting location in the United States for some of these species. Ten of Maine’s coastal islands provide habitat for 94% of all Common and Arctic Terns and 100% of all Roseate Terns nesting in Maine. These islands are intensively managed to provide a system of multiple and alternative nesting sites when adverse conditions are present (e.g. disease, predators etc.) that may drive the birds to breed elsewhere.

Species of Concern:

In addition, Maine coastal islands host 90% of all Common Eiders nesting in the continental United States. Further, hundreds of thousands of migrating shorebirds, songbirds and raptors depend on Maine coastal areas during spring and fall migration, a period that comprises more than half of their life cycle. Many of these species are also federally or state listed as endangered, threatened, or of special concern. Bald Eagles are now prevalent along our coast as well. This species has recovered from endangered status and the coastal population is flourishing, having grown from a core population located in coastal Downeast Maine. Maine’s Bald eagles are still under the protection of the Bald and Golden Eagle Protection Act. In addition to eagles, many other raptors, such as the Merlin and Peregrine Falcon, breed as well as migrate along and through the Gulf of Maine.

Current research in avian migration is demonstrating that the Gulf of Maine is a critical pathway in passerine migration, with much higher numbers of migrants passing through in spring and fall than biologists had previously known. Many of these birds, such as Bicknell’s Thrush, are of concern and face challenges at both wintering and breeding grounds. Migrating songbirds frequently fly at an altitude of over 1,000 feet in clear weather, easily clearing any rotors from a wind facility. However, in foggy and inclement weather passerines fly lower and potentially within the rotor’s zone. Gulf of Maine weather in spring and fall is frequently foggy with poor visibility, and these conditions are the most difficult to survey for wildlife, making monitoring at sites more challenging. Using radar to detect large scale movements of migrants can be very helpful, though NEXRAD radar systems operate at a relatively insensitive scale during inclement weather, and may be missing bands of migrating birds. Radar survey methods must be verified in all weather conditions and at various times of day- notably at night and in the early morning in order to catch migrating birds passing through. We recognize this provides challenges, but it is critical that we gauge the reliability of radar system detections.

The largest colony of federally endangered Roseate Terns in Maine is on Eastern Egg Rock, a seven acre island owned by the Maine Department of Inland Fisheries and Wildlife, less than 20 miles away from the proposed site. Despite decades of research and extensive monitoring, we still do not know foraging sites of these rare birds in Maine. Nesting sites elsewhere have observed Roseate Terns seeking food 20-30+ km from nest sites during the breeding season, and local prey availability can drive terns to forage farther away from nest sites (J. Burger et al., 2011). It is imperative that we have a better understanding of foraging locations of Roseate Terns on Eastern Egg Rock and elsewhere on Maine’s islands before infrastructure potentially damages foraging areas, routes to feeding grounds, or migratory pathways.

Beyond birds:

Birds aren’t the only migrants flying through the Gulf of Maine. Several bat species cross over the Gulf and some breed on Maine islands. Bat populations have declined dramatically in the region since 2009 due to the spread of white-nose syndrome (WNS), with the loss of at least 5.7 million bats in that time. Although this loss has hit residential cave hibernating bats the hardest, the potential mortality to migratory tree bats at wind farms has been well- documented, particularly in the Appalachian Mountains and the mid-Atlantic states, and concern for this additional mortality is elevated due to the confounding mortality from WNS. Bats seem to be attracted to turbines spinning at lower speeds, and recent terrestrial wind developments in Maine have required cut-in speeds be raised to 5.0 m/sec at dusk and dawn, from April to September, to reduce potential mortality. The US Fish and Wildlife Service is currently considering listing several species of bats that breed and pass through Maine because of these dramatic declines, making them of particular concern.

Closing Comments

The most conspicuous potential risk to wildlife from wind facilities is collision with the rotors and associated structures. However, offshore wind facilities may have harmful effects on wildlife because of avoidance behaviors, barrier effects, and habitat alteration, all of which can be difficult to quantify and assess in the marine environment (Dreweitt and Langston, 2006) but are important considerations for the long-term survival of sea and water birds using the Gulf of Maine. Because these varying effects are difficult to measure, it is absolutely critical that the proposed test site is demonstrated not to be in a major migratory pathway or foraging area, and pre-construction surveys must cover not only the test site, but a wide area (1 km) around the site in order to detect potential displacement (Fox et al, 2006).

Given the extent and complexity of wildlife use in the area and the increase in size and scope of the project from the earlier proposed project at the same site, once again we strongly urge you to require a full EIS rather than the shorter EA to evaluate risks and alternatives.

If construction proceeds, we recommend that Aqua Ventus is cautious with lighting at the site through construction, maintenance, and operating phases. In order to minimize risks to migrating birds, we recommend that lighting is minimal, flashing, and red.

We appreciate the opportunity to provide comments and welcome any questions you may have about our recommendations.


Andrew Beahm
Interim Executive Director
Maine Audubon

Stephen Kress, Ph.D.
Executive Director, Seabird Restoration Program
National Audubon Society

[March 22, 2017]

Literature Cited

Burger, J., C. Gordon, J Lawrence, J. Newman, G. Forcey, L. Vlietstra. Risk evaluation for federally listed (roseate tern, piping plover) or candidate (red knot) bird species in offshore waters: A first step for managing the potential impacts of wind facility development on the Atlantic Outer Continental Shelf. Renewable Energy 36 (2011) 338-351.

Drewitt A.L. and R.H.W. Langston. Assessing the impacts of wind farms on birds. Ibis 148 (2006) 29-42.

Fox, A.D., M. Desholm, J. Kahlert, T.K. Christensen, I.K. Petersen, Information needs to support environmental impact assessment of the effects of European marine offshore wind farms on birds. Ibis 148 (2006) 129-144.

National Research Council – National Academy of Sciences. Environmental Impacts of Wind Energy Projects. (2007).

Download original document: “Audubon letter re wind turbines (Aqua Ventus I) near Monhegan Island, Maine”

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Date added:  March 24, 2017
Alberta, WildlifePrint storyE-mail story

Origins and migratory patterns of bats killed by wind turbines in southern Alberta: evidence from stable isotopes

Author:  Baerwald, Erin; Patterson, Bill; and Barclay, Robert

Abstract. Large numbers of migratory bats are killed every autumn at wind energy facilities in North America. While this may be troubling from a population perspective, these fatalities provide an opportunity to learn more about bat migration and the origins and summer distributions of migratory bats by using endogenous markers. Such markers include stable isotope values, which have been used to answer questions about ecological systems, such as trophic levels and food webs, and the origins and migratory routes of animals. To estimate the origins of migratory bats, we determined nitrogen (δ¹⁵N), carbon (δ¹³C), and hydrogen (δ²H) stable isotope values of fur (δ¹⁵Nf, δ¹³Cf, δ²Hf, respectively) from hoary bats (Lasiurus cinereus) and silver-haired bats (Lasionycteris noctivagans) killed at a wind energy facility in southern Alberta, Canada. We determined that mean isotope values varied among species, year, sex, and age class. δ¹³Cf and δ²Hf values indicated that silver-haired bats likely originated in the boreal forest, farther north and/or at higher elevations than the aspen parkland-like habitat suggested by the isotope values of hoary bats. IsoMAP analysis indicated that bat fatalities may have originated from a large catchment area potentially hundreds of kilometers away. Our data provide further evidence for a migration route along the eastern slopes of the Rocky Mountains that is used by bats from across Alberta and beyond, and suggest that fatalities at a single wind energy site have the potential to have far-reaching ecological and population consequences.


Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada; and Saskatchewan Isotope Laboratory, Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

Ecosphere 5(9):118.

Download original document: “Origins and migratory patterns of bats killed by wind turbines in southern Alberta: evidence from stable isotopes”

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Date added:  March 23, 2017
Oregon, Washington, WildlifePrint storyE-mail story

Home Range and Resource Selection by GPS-Monitored Adult Golden Eagles in the Columbia Plateau Ecoregion: Implications for Wind Power Development

Author:  Watson, James; Duff, Andrew; and Davies, Robert

ABSTRACT: Recent national interest in golden eagle (Aquila chrysaetos) conservation and wind energy development prompted us to investigate golden eagle home range and resource use in the Columbia Plateau Ecoregion (CPE) in Washington and Oregon. From 2004 to 2013, we deployed satellite transmitters on adult eagles (n = 17) and monitored their movements for up to 7 years. We used the Brownian bridge movement model (BBMM) to estimate range characteristics from global position system (GPS) fixes and flight paths of 10 eagles, and modeled resource selection probability functions (RSPFs). Multi-year home ranges of resident eagles were large (99% volume contour;  = 245:7 km², SD = 370.2 km²) but were onethird the size ( =  82:3 km², SD = 94.6 km²) and contained half as many contours when defined by 95% isopleths. Annual ranges accounted for 66% of multi-year range size. During the breeding season (16 Jan–15 Aug), eagles occupied ranges that were less fragmented, about half as large, and largely contained within ranges they used outside the breeding season ( overlap = 82.5%, SD = 19.0). Eagles selected upper slopes, rugged terrain, and ridge tops that appear to reflect underlying influences of prey, deflective wind currents, and proximity to nests. Fix distribution predicted by our resource selection model and that of 4 eagles monitored independently in the CPE were highly correlated (rs = 0.992). Our findings suggest conservative landscape management strategies addressing development in lower-elevation montane and shrub-steppe/ grassland ecosystems can best define golden eagle ranges using exclusive 12.8-km buffers around nests. Less conservative strategies based on 9.6-km buffers must include identification and management of upper slopes, ridge-tops, and areas of varied terrain defined by predictive models or GPS telemetry. For both strategies, high, year-round intensity of eagle flight and perch use within 50% volume contours (average 3.2 km from nests) due to nest centricity may dramatically increase the probability of eagle conflict with wind turbines in core areas as evidenced by eagle turbine strikes that studies have documented within and beyond this zone.

Washington Department of Fish and Wildlife, Olympia, WA, USA

The Journal of Wildlife Management 78(6):1012–1021; 2014; DOI: 10.1002/jwmg.745

Download original document: “Home Range and Resource Selection by GPS-Monitored Adult Golden Eagles in the Columbia Plateau Ecoregion: Implications for Wind Power Development”

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