[ exact phrase in "" • results by date ]

[ Google-powered • results by relevance ]


News Home

Subscribe to RSS feed

Add NWW headlines to your site (click here)

Sign up for daily updates

Keep Wind Watch online and independent!

Donate $10

Donate $5

Selected Documents

All Documents

Research Links


Press Releases


Publications & Products

Photos & Graphics


Allied Groups

Weather influences wind farm fatalities  

Wind and storms affect how deadly wind-energy turbines are for bats. Several studies in North America report that most bats die during nights of light wind, blowing at less than 13 miles per hour (21 kilometres per hour). Bat mortality at wind turbines also spikes just before and after a storm front passes by.

Different wind energy installations within a region have documented similar timing in fatalities, suggesting that a weather pattern can have widespread influence.

Most bats that get killed at wind turbine sites are on their fall migration. Observations at the Mountaineer Wind Energy Center in West Virginia reveal that bats don’t just pass through wind turbine installations.

Bats actually investigate the turbines by repeatedly flying by and approaching the blades. The animals will follow a moving blade and some even become trapped in the air vortices near a blade’s tip. Rotating blades end up smacking the more unfortunate bats. Hundreds of dead and injured bats have been found beneath the wind turbines at the West Virginia installation.

Bats that roost in trees, such as hoary bats, are the most frequent victims of this and 19 wind-energy facilities studied in United States and Canada. Some turbines are also death traps for female bats in spring. Pregnant Brazilian bats died at a wind energy site in Oklahoma and female silver-haired bats were killed by turbines in Tennessee and Alberta.


Edward B. Arnett, W. Kent Brown, Wallace P. Erickson, Jenny K. Fiedler, Brenda L. Hamilton, Travis H. Henry, Aaftab Jain, Gregory D. Johnson, Jessica Kerns, Rolf R. Koford, Charles P. Nicholson, Timothy J. O’Connell, Martin D. Piorkowski and Roger D. Tankersley Jr. 2008. Patterns of Bat Fatalities at Wind Energy Facilities in North America. Journal of Wildlife Management. 72(1): 61-78.

Journal Article

Jason W. Horn, Edward B. Arnett and Thomas H. Kunz. 2008. Behavioral Responses of Bats to Operating Wind Turbines. Journal of Wildlife Management. 72(1): 123-132.

Journal Article

By Liz Osborne

Current Results

This article is the work of the source indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

The copyright of this article resides with the author or publisher indicated. As part of its noncommercial effort to present the environmental, social, scientific, and economic issues of large-scale wind power development to a global audience seeking such information, National Wind Watch endeavors to observe “fair use” as provided for in section 107 of U.S. Copyright Law and similar “fair dealing” provisions of the copyright laws of other nations. Send requests to excerpt, general inquiries, and comments via e-mail.

Wind Watch relies entirely
on User Funding
Donate $5 PayPal Donate


News Watch Home

Get the Facts Follow Wind Watch on Twitter

Wind Watch on Facebook


© National Wind Watch, Inc.
Use of copyrighted material adheres to Fair Use.
"Wind Watch" is a registered trademark.