Wind turbines kill bats primarily when operating, and increasing the cut-in speed (curtailment) can reduce bat fatalities, but this practice reduces energy production; smart curtailment uses acoustic detectors and incorporates multiple environmental factors (temperature, wind speed, time of night, time of year) to minimize curtailment time while protecting vulnerable bat species like hoary bats, which account for over a third of bat deaths at North American wind farms.
Bats & Wind Turbines: Smart Curtailment Strategies for Clean Energy
Added:wind turbines have become an icon of sustainability and renewable energy raishin as turbines get more efficient the industry is poised to expand into new parts of the country with where the winds are lower this is great news for the renewable energy future but it could mean trouble for this guy this furry critter is a hoary bat one of the migratory species that accounts for over a third of the estimated half-million bats that die annually at wind farms in North America at least some of you are probably surprised to learn that bats collide with wind turbines after all bats can navigate with echolocation in complete darkness and capture small insect prey but it turns out that bats are actually attracted to turbines and unable to avoid the fast-moving blades when they did when they get too close research has shown that if you that the other factor that's important to know is that turbines only kill bats when they're operating so turbines don't spin until the wind reaches a certain threshold known as the cut-in speed at this wind speed the turbines are programmed to pitch their blades start turning and generating electricity but by changing that cutting speed by increasing it for example we found that the bat fatality rates can be lowered substantially the trouble is an idle turbine doesn't make any power and so this practice of curtailment of increasing the cutting speed can spell disaster for a wind farm if there's too much time that is required to be curtailed so what my research does is use acoustic detectors on the tops of bat of wind turbines to figure out when bats are actually active and to better predict when periods of risk will occur bats are only at risk when turbines are spinning but the risk also varies as a function of temperature wind speed time of night time of year as well as other factors so incorporating those additional factors beyond just wind speed you can reduce the amount of time that create that turbines are curtailed thus reducing the cost of curtailment while still protecting bats this practice of incorporating additional parameters is known as smart curtailment and has attracted attention and so what a part of what my research is doing is creating data visualization tools like the heat map here to help wind operators design an optimal curtailment strategy that minimizes energy loss while protecting bats so hoary bats are the most vulnerable bat species to wind energy impacts and it's estimated that there need to reduce fatality rates by as much as 50 to 60 percent to avoid significant population impacts this is really only possible if the industry adopts curtailment broadly and for this to work curtailment has to be cheap so the goal of my research is to provide additional tools that the wind industry can use to minimize fatality while generating power and my hope is that these tools will allow the industry to grow while protecting the future of hoary bats and other vulnerable wildlife thank you [Applause]
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