Date: May 3, 2007
Contacts: Sara Frueh, Media Relations Officer
Michelle Strikowsky, Media Relations Assistant
Office of News and Public Information
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FOR IMMEDIATE RELEASE
Use of Wind Energy in
New Report Examines Wind Energy's Impacts on Emissions, Wildlife, and Humans
Currently, federal regulation of wind projects on private land is minimal, the report observes. And although some states have developed guidelines, wind energy is such a recent addition to the energy mix in most areas -- the nation's wind-energy capacity more than quadrupled between 2000 and 2006 -- that most states are relatively inexperienced at planning and regulation. Despite the growth in its use, wind energy still generates less than 1 percent of the nation's electricity. Some national-level policies to enhance the benefits of wind energy and minimize its harms would help guide state and local regulatory efforts, the report says.
Impacts on CO2 and Other Pollutants
A primary benefit of using wind to generate electricity is that it produces no carbon dioxide (CO2), a major greenhouse gas, or any other air pollutant. Based on U.S. Department of Energy projections for wind-energy development in the
The committee concluded that use of wind energy to generate electricity probably would not significantly reduce emissions of two other pollutants, sulfur dioxide and nitrogen oxides, because current and expected regulations of these are largely based on cap-and-trade programs. The degree to which emissions would be further reduced through special provisions to encourage wind-energy use -- such as set-asides, in which a percentage of emissions allowed under the cap are retired to the extent they can be offset by wind energy -- is uncertain, the committee added.
In the mid-Atlantic region, wind energy will likely contribute a lower proportion of electricity generation than it will in the United States overall, the report says; compared to other areas, a smaller portion of the region has strong, relatively steady winds.
Effects on Wildlife
Wind facilities can have certain adverse environmental effects on a local or regional level, by damaging habitat and killing birds and bats that fly into turbines. Among birds, the most frequent turbine fatalities are nocturnal, migrating songbirds, probably because of their abundance, the report says. However, the committee saw no evidence that fatalities from existing wind facilities are causing measurable changes in bird populations in the
Too little information is available to reliably predict how proposed new wind projects in the mid-Atlantic highlands would affect bird populations, the report says. As for bats, turbines placed on ridges -- as many are in the mid-Atlantic region -- appear more likely to kill them than turbines sited elsewhere. In fact, preliminary information indicates that in the mid-Atlantic highlands more bats are killed than expected based on experience with other regions, the committee said. Although scarce data make it hard to say how these deaths affect overall bat populations, the possibility of population effects is significant, especially if more turbines are added, given a general decline in several species of bats in the eastern United States.
Studies to evaluate possible ecological impacts should be conducted prior to choosing sites for wind facilities, the committee said, and follow-up studies should be conducted to measure actual effects. Additional basic research also is needed to help assess the short- and long-term impacts of these facilities on species at risk.
Impacts on Humans
A common objection to proposed wind projects is that they will have a negative aesthetic impact. The report outlines a process to help communities and developers assess a project's likely aesthetic effects, and suggests ways to minimize them -- for example, by using uniform types and sizes of turbines, and by ensuring that each region retains some undeveloped scenic vistas. The report also offers questions to ask, to help determine whether the aesthetic impact might be great enough to render a project unacceptable.
Wind projects also can be disruptive because of noise and shadow flicker, a strobelike effect caused by rotating turbine blades. The report recommends that noise surveys be conducted before a project is sited, and that processes be set up to respond to noise complaints. Shadow flicker has generally not been a problem at wind facilities in
The report also considers beneficial and adverse economic effects on local areas -- such as effects on landowners, the regional economy, and local government revenues -- and recommends measures to anticipate and mitigate potential problems. In addition, the report discusses possible electromagnetic interference with local installations such as radar.
Improving Planning and Regulation
Governments at the state and local levels should provide developers and the public with guidance to help them plan for wind-energy development, including guidance on procedures and information needs for assessing projects, the report says. It also recommends that regulatory agencies adopt an evaluation guide to review proposed projects, and that governments work with each other and with organizations and developers to create guidelines for weighing projects' costs and benefits at scales ranging from local to national.
The report was sponsored by the White House Council on Environmental Quality. The National Academy of Sciences, National Academy of Engineering,
Copies of Environmental Impacts of Wind Energy Projects will be available from the National Academies Press; tel. 202-334-3313 or 1-800-624-6242 or on the Internet at http://www.nap.edu. Reporters may obtain a pre-publication copy from the Office of News and Public Information (contacts listed above).
NATIONAL RESEARCH COUNCIL
Division on Earth and Life Studies
Board on Environmental Studies and Toxicology
Committee on Environmental Impacts of Wind Energy Projects
Paul G. Risser (chair)
University Research Cabinet
Ingrid C. Burke
University Distinguished Teaching Scholar and Professor
Department of Forest, Rangeland, and Watershed Stewardship
I.P. Johnson Director
Bioacoustics Research Program
Laboratory of Ornithology
Mary R. English
Energy, Environment, and
Sidney Gauthreaux Jr.
Professor of Biological Sciences
Sherri W. Goodman
Center for Naval Analyses Corp.
Department of Wildlife Ecology and Conservation
Engineering and Project Management Program
Department of Civil and Environmental Engineering
Center for Ecology and Conservation Biology, and
Professor of Biology
Lynn A. Maguire
Professor of the Practice of Environmental Management, and
Director of Professional Studies
Department of Civil Engineering
University of Texas
Erik Lundtang Petersen
Wind Energy Department
Risø National Laboratory
Vice President and Senior Ecologist
Western EcoSystems Technology Inc.
Jean Vissering Landscape Architecture
James Roderick (Rick) Webb
Department of Environmental Sciences, and
Shenandoah Watershed Study and Virginia Trout Stream Sensitivity Study
University of Virginia
Professor of Wildlife Ecology
West Virginia University
RESEARCH COUNCIL STAFF