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Print 38 comment(s) - last by The Raven.. on Nov 4 at 10:28 AM


  (Source: Treehugger)
Raising the cut-in speed to 11 mph could result in as much as a 93 percent reduction in bat-turbine related deaths

Wind power has become an important competitor in the race for clean energy, but like many newer developments, it needs some work. One issue associated with wind power is bat and bird-related fatalities due to the spinning blades of the turbines. However, researchers may have solved this problem with a slight change in speed

Edward Arnett project leader from the Bat Conservation International in Austin, Texas, along with John Hayes, co-author of the study from the University of Florida, have studied bat fatalities associated with wind turbines and concluded that altering the speed slightly would reduce a large percentage of these deaths.

Wind turbines within the United States are programmed to start producing power when wind speed reaches 8 or 9 mph. The speed at which wind turbines begin producing power is the cut-in speed, and those with a low cut-in speed tend to run more often than those with a high cut-in speed because they begin running at lower speeds in the first place. 

Arnett, Hayes and their research team recorded bat fatalities while observing 12 out of 23 turbines at the Casselman Wind Project in Somerset County, Pennsylvania. They stayed for 25 summer and fall nights in 2008 and 2009 (because wind speeds are low this time of the year), and found that the less time a wind turbine is running, the better because bats cannot be harmed by blades that aren't in motion. Following this logic, Arnett suggests raising the cut-in speed of wind turbines to 11 mph, which would result in a reduction of bat fatalities by approximately 44 to 93 percent and an annual power loss of less than one percent. 

"This is the only proven mitigation option to reduce bat kills at this time," said Arnett. "If we want to pursue the benefits associated with wind energy, we need to consider the local ecological impacts that the turbines could cause. We have already seen a rise in bat mortality associated with wind energy development, but our study shows that, by marginally limiting the turbines during the summer and fall months, we can save bats as well as promote advances in alternative energy."

Arnett notes that reducing bat fatalities is essential because bats help with pollination and pest management, making them an important part of ecosystem health nationwide. 

"Rarely do you see such a win-win result in a study," said Arnett. "There is a simple, relatively cost-effective solution here that could save thousands of bats. This is good news for conservation and for wind energy development." 

This study was published in Frontiers in Ecology and the Environment on November 1.



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RE: This is news?
By FaaR on 11/4/2010 8:29:05 AM , Rating: 2
Bats use echo-location not because they're blind (which they in fact aren't, seeing as they got eyes), but because bats hunt at night, when there's not much light to be had to see by.

So in other words, the saying which you quote, is - like so many other sayings - nothing but a big ol' load of crap.


RE: This is news?
By The Raven on 11/4/2010 10:10:55 AM , Rating: 2
You are right. I didn't mean for the hyperbole to come off that way. But it must be noted that bats don't have great vision and certainly don't rely on it at night (which is when they are awake). And when they do use their vision, it is poor (though variances exist depending on the species).

And it should also be noted that just because an animal has eyes doesn't mean that it can see. I think moles can see (poorly) but there are other species of animals that live underground and they have non-seeing eyes. Truly blind.
I think they are caught in a point of evolution where they haven't yet "cast off" their eyes.

But my point was that a bat might have issues with these windmills due to the fact that they rely heavily on echolocation. And though they are extremely precise, that skill would be compromised if they were to locate the blades of a quickly spinning windmill.

Point is: this study isn't a "big ol' load of crap" ;-)


RE: This is news?
By The Raven on 11/4/2010 10:28:59 AM , Rating: 2
quote:
For bats, vision is important for foraging and homing, and for predator avoidance. Mesopic vision (at light levels that stimulate both the rods and the cones) is particularly relevant at dusk and dawn and on brightly moonlit nights. For flower-visiting and nectar-feeding bats like those studied here, UV vision should increase foraging success, as many flowers visited by bats show UV reflection.


http://www.sciencedaily.com/releases/2009/07/09072...

This looks like it should be the definitive word that bats aren't as blind as I thought they were.


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