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Resource Documents by Hein, Cris

Hein, Cris; and Schirmacher, Michael
Impact of wind energy on bats: A summary of our current knowledge
Abstract Since 2003, when it was discovered that large numbers of bats were being killed at wind turbines in the eastern United States, our understanding of the impact of wind energy development on bats has increased and consistent patterns of fatality, including seasonality and species composition have become evident. Yet, many questions remain despite the wealth of data collected across numerous post-construction monitoring studies. We synthesized the recent literature to provide an overview of our current understanding of patterns of . . . Complete article »

Arnett, Edward; Hein, Cris; Schirmacher, Michael; Huso, Manuela; and Szewczaik, Joseph
Evaluating the effectiveness of an ultrasonic acoustic deterrent for reducing bat fatalities at wind turbines
Abstract. Large numbers of bats are killed by wind turbines worldwide and minimizing fatalities is critically important to bat conservation and acceptance of wind energy development. We implemented a 2-year study testing the effectiveness of an ultrasonic acoustic deterrent for reducing bat fatalities at a wind energy facility in Pennsylvania. We randomly selected control and treatment turbines that were searched daily in summer and fall 2009 and 2010. Estimates of fatality, corrected for field biases, were compared between treatment and . . . Complete article »

Arnett, Edward; Johnson, Gregory; Erickson, Wally; and Hein, Cris
Synthesis of operational mitigation studies to reduce bat fatalities at wind energy facilities in North America
We conclude that increasing cut-in speed between 1.5 and 3.0 m/s or feathering blades and slowing rotor speed up to the turbine manufacturer’s cut-in speed yields substantial reductions in fatality of bats. Given the magnitude and extent of bat fatalities worldwide, the conservation implications of our findings are critically important. Research efforts should continue to focus on incorporating additional variables, in addition to wind speed (e.g., temperature, time of night, bat activity) into treatments and explore using automated systems to . . . Complete article »

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