This study focused on nocturnal migration patterns and flight behaviors during the peak periods of passerine and bat migration during fall 2005 at the proposed Highland New Wind Development in Highland Count. Virginia. The key results of our study were: (I) the mean overall fall passage rate was 385 targetsikmh; (2)mean nightly passage rates ranged from 9 to 2,762 targetshh, (3) the percentage of targets passing below 125 m agl was 11.5%; (4) the estimated turbine passage rate of nocturnal migrants passing within the airspace occupied by each proposed turbine was 3.4-24.7 migrantslturbineid during the fall study period; (5) fall migrants flying at or below maximal turbine height consisted of 88% birds and 12% bats; and (6) passage rates, flight altitudes, and visual observation rates of birds and bats did not differ between the two survey sites within the project area.

This Action Statement has been prepared under section 19 of the Flora and Fauna Guarantee Act 1988 under delegation from Chtoe Munro, Secretary, Department of Natural Resources and Environment, June 2001

...additional radar studies would be required to see if spring migration patterns are different than those measured in the fall. Typically spring migration is shorter than fall migration with fewer numbers in the shorter period of time. How this will affect the numbers of birds passing through the rotor swept volume is unknown. It is important to determine the seasonal timing, altitude and numbers of migrant birds passing over the proposed project site and the effects of weather upon their passage over a greater part of the whole year. In addition, it is possible to determine some of the bird and bat species passing through the project site by accoustical sensors to determine which species, that make vocal calls, are migrating through the site.

This important collaborative document describes the current research on wind energy and the assessment of impacts on nocturnally active birds and bats.

While the public and many decision-makers generally believe that wind energy is environmentally benign, it may entail significant detriments to wildlife and essential habitats, which need to be more clearly understood, and addressed. State fish and wildlife agencies should be at the forefront of cooperative development and implementation of measures to characterize, avoid, minimize and effectively mitigate the impacts of wind energy development on natural resources. Therefore the position of the Association of Fish and Wildlife Agencies, in regard to wind energy development is to: ...

This important report, which appeared in the Wildlife Society's Journal of Wildlife Management, details the effect on raptor and bird mortality following repowering a portion of the Altamont Pass Wind Resource Area (APWRA) in California (USA). Repowering involves removing older generation towers and replacing them with higher capacity -- and potentially better sited -- units. The abstract to this report appears below. The full report can be accessed by clicking on the link at the bottom of this page.

The Service favors:
--conservation of wildlife in the public trust;
--development of renewable energy that is bird and bat friendly; and
--use of informed decisions based on adequate environmental assessment and sound science.

Below are two Phase I Avian Risk Assessments reports, prepared by Paul Kerlinger, for Vermont's East Haven Wind Farm (July 2003) and New Hampshire's Lempster Mountain Wind Power Project (June 2005). Phase I assessments have proven inadequate in assessing mortality at several sites in the U.S. including Mountaineer in West Virginia and Meyersdale in Pennsylvania. The US Fish and Wildlife Interim Wind/Wildlife Guidelines calls for multi-year evaluation of avian and bat activity using remote sensing.

This report, authored by the Wind Energy and Bats subcommittee to the Pennsylvania Biological Survey's (PaBS) Mammal Technical Committee, documents the PA Game Commission's direct side-stepping of a long-established memorandum of agreement with the PaBS when the Game Commission developed and finalized the Wind Energy Voluntary Cooperation Agreement without the review or input of the Biological Survey. The memorandum of agreement was created over 10 years ago to help ensure that the Game Commission obtained advice from experts about actions affecting the mammals inhabiting the Commonwealth.