shredded tweet :(

Be interesrting to know what overall % of each population these whacked birds contribute? Does it result in a noticable species population decline? I doubt these windmills actually attract the fowl, seems like they'd learn from observering their buddies demise?...eventually anyway.

One could design & construct a bird-friendly windmill, with larger blades, and reduced angular velocity. Such a machine would work fine in light to moderate winds, but it would be vulnerable to mechanical damage from high winds. The windmill would have to be taken down or retracted in some manner when wind speed exceeds a certain velocity.

I have seen the farms of windmills near Palm Springs, and I have never seen the windmills turn fast enough to shred a bird (well maybe, a really stupid bird). It is really windy in that area and I have been there when there were 30-40mph winds, and it didn't appear that the windmills were turning fast enough to hurt anything.

Of course, I havent been there during a Santa Ana when winds sometimes exceed 60 mph--it may different then. It could also be the birds are looking for a nesting area on top of the windmills (especially if the windmills are barely moving). I don't know what you can do about that.

This is a subject that interests me because windmills are being contemplated for Delaware bay, one of my favorite areas.

Of note is that although there are numerous reports of birds being killed, those reports don't cite the sources! I mean, there are lots of articles bewailing the numbers (and it seems you can pick any number likely to sound impressive) of birds killed, but if you try to track down *who* counted [and when, and where], you aren't going get much in the way of specifics, much less verifiable specifics.

Anyhow, I found one reliable report of 150 birds [annually] near a Japanese windmill; one report in the Sierra Club files re an Altovista windsite that was apparently constructed predating environmental concerns; and (see link) a newspaper report which does name sources, for windmill sites in Denmark which are closely watched by environmental groups. I linked the article rather than the sources, because it is one of the least-biased articles I have seen on the subject; the comments re environmental concerns are about 2/3 down the article.

Here is a link that might be useful: Danish windmills

The California lawsuit concerns bird strike in Altamont Pass. There are said to be 7000 windmills in Altamont Pass, and every year, federal authorities collect about 1000 dead birds. The location is part of an established migration path for eagles and hawks.

I found one article from northern Calif. newspaper. It does get frustrating to hear of the complaints, yet never see credible reports that would have so much as an appendix with a complete photo collection of bird carcasses noting species, location and date found (estimated day of death). Why does it seem the "counters" have such a hard time presenting their counts to others in a way that enables independent verification? I smell a racket...

It remains difficult to imagine that the mortality rate would be so high for any one species that it would be better to do without a wind farm here or there, for the sake of preserving a species. Isn't the "science" of windmills' impacts on bird populations still at a delicate stage of history, where it would be all to easy to go in the direction whose equivalent would be, "Have you heard about all the people who've been killed lately?! Oh NO, those automobiles are just way too dangerous - too many people get killed by them or in them - we'd better BAN them, and stick to horses!"

Of course, our species is probably more guilty than most of us want to admit of taking the attitude, "If you can't stand the way I drive, stay off the sidewalk!" Still, I feel like all I can say to the dead bird-counters (er, I mean: counters of dead birds!) who oppose construction of windmills is, "If you don't like the way I environmentalize, stay off my planet!"

Here is a link that might be useful: Headline: Haggerty Wants Plan (on p.2)

Now I know why Santa never made it to my place this year...those reindeer would have made quite a mess...venison, anyone?

Regards,

Shax

The solution for wind generators with the best usefull range of wind speed is likely the variable pitch blade. It should also make it easier to design a wind turbine that rotates at a speed the birds can avoid. Lighting the blades will help with any night flying birds.

With a variable pitch blade, the attack angle of the rotating blade is adjusted by a governor so that, as the wind speed increases, the blade rotates into the wind to lessen the attack angle. At the lower attack angle the turbine runs at the same speed as the steeper attack angle in weaker winds.

The lower attack angle in higher velocity winds also means less lateral force against the structure, and since the blades don't spin faster, they don't have to be as strong to counter the centrifugal force induced by the spinning.

My experience appears to have been the same as most who posted on this forum. I have yet to see a modern wind turbine that appears to be rotating at a speed that a bird could not easily avoid.

Two comments:

First, if they are spinning so fast why aren't they advocating caging the blades somehow instead of eliminating the turbines?

Second: why is environmental consciousness almost always tied (not just linked) to socialism? (see the boston.com news article: the person who does the write-up chooses who to quote and how to quote them)

Thanks, Shax. In fact, just had some venison about an hour ago.
V- being that humans can rarely learn from watching others' mistakes, certainly you don't expect that birds can?!
Mrs H

According to sources I've read, one of the best soultions, although there has been no study to verify the theory, is to replace the old turbines with fewer, new, higher turbines.

Here is a link that might be useful: lots of info regarding altamont

Windmills are not just killing birds they are killing bats too. This article appeared in saturdays Washington Post. Sarah
By Justin Blum
Washington Post Staff Writer
Saturday, January 1, 2005; Page A01

Jessica Kerns thought her survey of new power-generating wind turbines on a mountaintop in West Virginia would yield the standard result: a smattering of dead birds that were whacked by the whirring blades.

But the University of Maryland doctoral student turned up something unexpected amid the trees and rolling ridges of Backbone Mountain: hundreds of bat carcasses, some with battered wings and bloodied faces. "It was really a shock," Kerns said.

Thousands of bats have died at Backbone and on another nearby wind farm in Meyersdale, Pa. -- more per turbine than at any other wind facility in the world, according to researchers' estimates. The deaths are raising concerns about the impact of hundreds more turbines planned in the East, including some in western Maryland, as the wind industry steps up expansion beyond its traditional areas in the West and Great Plains.

The bat deaths, which have baffled researchers, pose a problem for an industry that sells itself as an environmentally friendly alternative to conventional power plants. Wind proponents already have had to battle complaints about bird deaths from the blades and about unsightly turbines marring pristine views.

The white turbines in Appalachia rise more than 340 feet above the ground -- well above the tree canopy -- and are lined up close to one another to catch the wind as it blows over the mountains and ridges.

The bat problem could worsen, conservationists fear, as wind developers rush to erect new turbines following the recent renewal of a federal tax break for a year. The wind industry, which had been virtually dormant since the last tax break expired a year ago, projects more wind turbines to be built around the country this year than in any previous year. In the areas near where bats have been killed in Pennsylvania and West Virginia, activists said, roughly 700 new turbines have been proposed or approved.

"Take the most conservative estimates of mortality and multiply them out by the number of turbines planned and you get very large, probably unsustainable kill rates," said Merlin D. Tuttle, president and founder of Bat Conservation International, whose Austin-based group is leading the research effort in Appalachia. "One year from now we could have a gigantic problem."

Bats serve an important role in nature, and their populations are believed to be in decline, scientists said. The bats getting killed in Appalachia devour insects that pose grave threats to crops such as corn and cotton. They also feast on pests that can spread disease, such as mosquitoes.

On Backbone Mountain, at a facility called Mountaineer Wind Energy Center, the first dead bats were found in 2003, soon after the project's 44 turbines came online. Conservationists and the wind industry hoped the deaths were a fluke.

But Kerns and other researchers returned last year and now estimate the 2004 death toll at between 1,500 and 4,000 bats. Nearby, another group of researchers, working at the 20-turbine wind farm in Pennsylvania, which came online a year ago, found a raft of bat carcasses as well.

Researchers do not know why bats are flying into the turbines. Armed with radar and thermal imaging cameras, they are trying to come up with recommendations for wind power developers to avoid the problem. Researchers are uncertain whether bats are attracted to the spinning blades or if their sonar, which allows them to find food and avoid trees and other objects, fails to detect the turbines.

None of the species of bats found on the two mountains is endangered, said Albert M. Manville II, a biologist with the U.S. Fish and Wildlife Service. The carcasses found include those of hoary, red and eastern pipistrelle bats. The deaths appear to violate no federal laws, Manville said, but the threat is serious. Unless a solution is found, he said, the turbines could get a reputation as being "bat Veg-o-matics."

The large number of dead bats caught the wind power industry by surprise, and now its leaders are scrambling to find a solution.

"It was something that when we found out about it we felt we needed to respond to immediately," said Laurie Jodziewicz of the American Wind Energy Association in Washington, which also is participating in the research. "What we wanted to do this year was to get a handle on what's going on. "

The wind industry confronted its biggest environmental challenge when early model turbines in Northern California killed large numbers of birds. The industry says newer turbines and more attention to site selection have dramatically cut the number of bird deaths in subsequent projects around the country, though some environmentalists say too many birds are still dying.

The turbines tend to attract a lot of attention as they pop up around the country, but they are responsible for generating a tiny amount of electricity in the United States.

Last year, the industry said, it provided nearly 17 billion kilowatt hours, enough to serve some 1.6 million households -- less than 1 percent of the country's electricity production. Analysts said future expansion of the industry will be tied largely to whether the tax break remains on the books.

Wind power is generally more costly than generating electricity by more conventional methods -- though analysts said federal and state subsidies make the alternative more attractive. In addition, they said that as natural gas prices rise, wind becomes more competitive.

An increasing number of states require that a certain amount of power come from renewable sources, such as wind. During debate over federal energy legislation in previous years, some interest groups called for a requirement that renewable sources account for a certain percentage of the nation's electricity production.

In the East, wind has only recently caught on, and the most preferable areas are on mountains where wind tends to be most powerful.

In West Virginia and Pennsylvania, the turbines are positioned on wide paths cleared amid maple, oak and other hardwood trees.

And that may have something to do with the bat deaths. Bats appear to be attracted to the open areas cleared by the wind developers because they can more easily find insects there, researchers said. But they are unsure why the bats hit the blades of the turbines -- whether they're attracted or accidentally fly into them.

Some of the bats are migrating south and others live near the wind farms, researchers said. Most of the deaths occurred between July and September, which includes the months of peak migration.

The two sites where researchers have found a large number of bat deaths are operated by FPL Energy of Juno Beach, Fla., the largest U.S. generator of wind power.

"There is something going on . . . that we don't fully have our arms around," said Steve Stengel, a spokesman for FPL, which has helped fund the bat research. "Our hope is that there are some suggestions based on the research of things that can be done to potentially reduce the number of collisions."

Some in the industry argue that there's no evidence that the bat deaths in Appalachia will be repeated on other wooded mountaintops or ridges in the East. Bat conservationists disagree, saying the evidence gathered so far suggests the problem will recur.

Several wind developers working on projects in Appalachia said they were concerned but planned to move ahead. Among them is Clipper Windpower Inc. of Carpinteria, Calif., which is planning a project on a portion of Backbone Mountain in Western Maryland, about 20 miles from the Mountaineer project.

"We're hopeful that they're going to identify some of the major issues there and we'll be able to respond to those," said Kevin Rackstraw, the company's development leader for eastern North America. "I don't think it's an acceptable response . . . to stop everything until we have answers. You can't just bring everything to a screeching halt. You move forward diligently trying to respond to the concerns as best you can."

The bats' deaths have caused a painful split among environmentalists. Some continue to support new wind power projects, saying any harm they cause bats would be far less severe than the environmental problems associated with mining for coal and burning it to produce electricity. The industry concurs, saying the public needs to consider the overall harm other forms of energy production cause the environment compared to wind.

But other environmentalists are calling for a moratorium on development of wind projects on wooded mountaintops in the region until researchers figure out how to prevent bat deaths. Some, such as Dan Boone, spokesman of a group called Citizens for Responsible Wind Power and conservation chair for the Maryland chapter of the Sierra Club, said the amount of power generated by the windmills is not worth killing bats and birds.

"We have an industry targeting that area, and it's not doing it sensibly," Boone said. "We're blowing the promise of wind as a good, renewable energy source."

Some other environmentalists who disagree have launched an Internet petition calling on Boone to resign from his Sierra Club position.

Kerns, who studied the problem in 2003 for a contractor for FPL and is now working with the bat conservation group, said she has started to see patterns in the deaths. She has not reached any conclusive findings.

For example, before and after large storms, more bats tend to die. On warmer nights when wind speeds are lower, more have died. But researchers do not know why.

Kerns feels a sense of urgency to complete the research as developers ready their plans for nearby mountains.

"It's likely the same thing will occur," she said. "I look at the areas that are around here and I worry about the mortality that will occur there."

2005 The Washington Post Company

LOL - Good point Mrs H!
I suppose "bird-brain" is historically accurate when describing human thought patterns ;o).
vgkg (who took a cue from Hitchcock not to be too concerned about birds ;o)

IF the blades are so high-speed as to be a danger to flying critters, WHY can't slower blades be used? Or cages or bars or screens as protective barriers? Why aren't bird-deaths a problem with those windmills in use in Denmark and other countries? Is it a particular design of blade or turbine that is causing the problem here rather than there?

Wonder why the bats ran into those particular windmills? Bats avoid solid materials by use of sonar-type navigating, so it shouldn't have been a matter of not 'seeing' the danger. Do the blades squeak in a sonic range that attracts the bats? or maybe the turbines squeal in some pitch that they 'deafen' the bats by over-riding the bats' own sonar? Is this a unique situation, or have all the other groups watching over all the other windmill stations not noticed or failed to report bat battering? -- and I have difficulty imagining a problem with bats that is due to the windmill process in general, which no one else ever noticed or reported!

Common-sense indicates that care obviously should be taken to set windmills away from the well-known migratory routes; but I still haven't read any thing that to convince me that the use of windmills would damage more birds than the use of coal-fired electric plants does in everyday pollution.

I think the windmills are probably just killing the dumber birds and bats. Perhaps they will perform a beneficial function by Darwinian selection. It wouldn't be the first time animals have made adjustments to man's activities that has resulted in increasing their population. Whitetail deer, coyotes, and others come to mind.

Maybe these wind farmers should just get some cats; those will spook the birds away.

I think you're on to something there spewey! Just tie one cat to each blade....yeah that's the ticket.
vgkg (with cat in my lap ;o)

[from Washington Post article posted earlier] "For example, before and after large storms, more bats tend to die. On warmer nights when wind speeds are lower, more have died. But researchers do not know why."

OK: Point us to the papers! Not to the newspapers, but to the researchers papers!

Here are just a couple of "duh" ideas about those patterns of bat deaths. Before a large storm, bats want to eat more (ingesting more per hour than typical) to compensate for unavailable hunting time during the bad weather - so they hunt more aggressively or "recklessly." But of course, subscribing to that requires a way of verifying that the bats sense the oncoming bad weather, and/or somehow respond to anticipated bad weather and food supply fluctuations. (Bears do that, don't they? I believe some humans still do.) Or, perhaps the bats' prey (forget the bats) sense the oncoming bad weather and seek cover or more stable structures, so they cluster more around the turbines, which draws in the bats and increases collision risks.

After bad weather, similar ideas: bats are hungry and hunt more aggressively, and/or many bats are weakened or stressed by the weather that just passed, and regardless of how aggressively they hunt, they're just more prone to run into things.

The warmer night/lower wind "anomaly" presented the biggest "duh" to me: on warmer nights with light winds, it just makes intuitive sense that more prey are out and about, thus probably more bats too. It becomes a simple case of probability - just like more people in the US are killed in car accidents around holiday times.

Ahhh, the "Poshington Waste"...as trusted by some as "Faux News" is trusted by some others.

Slate was recently ripping the Post over some sensationalist reporting (with little or no basis in fact) regarding maternal homicides.

Ryan

So we are back to the same old questions: WHO did the research? WHERE was the study done? WHAT was the protocol (their method)? and of course, what were those results?

I am always reminded of an old prof's comment: "Anyone can 'prove' anything with one study; it takes ten studies by ten different people to begin to determine a trend; and there should be a hundred studies by a hundred people before putting forth a hypothesis."

There are more than 100 windmill sites, so where are the studies, and if there aren't any: why not?

Stitches,

Those reasons you suggest are indeed possible, but they're still just hypotheses.

The Washington Post does identify the researcher and discusses her survey, but it does not plagiarize her and quote the entire survey.

One could contact her through her school.

I think the Post is a very good paper. If it hadn't been for their reporting, the Watergate arrests wouldn't have led to anything. I am sure one can find fault with almost any newspaper, but few do so much original comprehensive reporting as the Post.

I didn't mean to call my ideas any more than "ideas," let alone hypotheses. Just thinking out loud.

And I absolutely do not mean to characterize my attitude toward articles in the Washington Post as one of automatic, total, or chronic distrust. I subscribed to it for many years and my life would be much poorer now, had I never read or trusted it. I am grateful for Blum's article (and for sarahbn's posting of it), for the researchers' and conservationists' work, and for the sensitivity, ingenuity, and tenacity of persons in the wind power industry. I encourage folks to check out all media, big or small, agreeable or offensive - and all research, famous or obscure.

I am following my instincts on this issue. Right now my instincts compel me to stay cautious (critical) about every "pro" and "con," and about every distinguishable effort that's relatable to a pro or a con. I am for more energy production from wind; I am against impacting the environment in ways that prevent species from sustaining themselves. I'd like to think that I go in the manner of the phrase I heard from an old fighter pilot-turned-"bureaucrat" who wanted to make a constructive difference in a new "battlespace:" "Lean forward, check six."

"Wind turbines kill migrating birds and bats, they say, and their construction chews up atmospherically beneficial life forms such as peat. Technically minded activists such as Bruce argue that the turbines produce nowhere near the energy levels they claim, and can increase emissions from fossil-fuel generators because of their destabilizing effects on the power grid."