...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.

The Animal Welfare Institute, Mountain Communities for Responsible Energy and David G. Cowan have filed a law suit against Beech Ridge Energy LLC and Invenergy Wind LLC under the federal Endangered Species Act ("ESA"). This filing seeks preliminary injunction to halt further construction, turbine erection, and operation of the Beech Ridge industrial wind power project. The plaintiffs argue that the project, if constructed, will result in the "likely killing, injury, and other forms of "take" of endangered Indiana bats in violation of the ESA." The wind project is proposed to be located on ridgelines in Greenbrier County, West Virginia.

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.

This compilation of scientific reports provides compelling evidence of significant bird mortality at windfarms. Its cumulative effect with other causes of bird deaths may bring many species to extinction - especially as captivity-bred specimens will be lacking turbine-free habitats where they can be released safely.

H.R. 2337 just introduced in the US House of Representatives by Congressman Rahall (D-WV), Chairman of the House Natural Resources Committee. Title II, Subtitle D (beginning with Sec. 231 on page 39) of the bill addresses the safe siting of wind energy facilities. This specific section can be found below.

The complete report available in sections.