Stories tagged wind energy

Feb
26
2014

Is it possible to deflate hurricanes by wind energy?: Huge wind turbines off the coast of Denmark show a small-scale version of an off-shore wind farm that could sap the energy of hurricanes and tropical storms.
Is it possible to deflate hurricanes by wind energy?: Huge wind turbines off the coast of Denmark show a small-scale version of an off-shore wind farm that could sap the energy of hurricanes and tropical storms.Courtesy Leonard G.
A new study claims that positioning large, off-shore wind farms in the path of oncoming tropical storms and hurricanes can reduce the damage those storms inflict. The extra electricity they produce is just an added bonus.

The study's findings contend that "tens of thousands of turbines can lower a hurricane's wind speed up to 92 mph and reduce its storm surge up to 79%."

But is it realistic to think that such a big wind operation could actually be built? Currently there are no operating water-based wind farms in the United States. The largest off-shore wind turbine sites being considered for construction have about 200 turbines planned. Those facilities are being planned off the coasts of Texas and New England. There are small-sized off-shore wind plants in Europe and China.

But if a huge wind operation was feasible, the study estimated that such a plant would have saved a lot of damage in the 2005 Hurricane Katrina in New Orleans. Somef 78,000 wind turbines — each 50 feet tall — could have slowed Katrina's wind speeds up to 78 mph and cut its storm surge up to 79%, the report from Stanford University said.

What do you think? Is this an idea ahead of its time? Is it pie – make that blowing pie – in the sky? Share your thoughts here with other Science Buzz readers.

Dec
10
2013

Wind power vs. eagle power: New regulations hope to spur more development of wind farms (above) by removing penalties power companies face if they kill bald eagles (below).
Wind power vs. eagle power: New regulations hope to spur more development of wind farms (above) by removing penalties power companies face if they kill bald eagles (below).Courtesy Jesus Martinez
In an interesting match-up between alternative energy sources and wildlife protection, wind energy appears to have come out the winner.

The Obama administration and the Interior Department last week decided it will waive penalties for up to three decades to wind energy farms that kill bald eagles in the generation of electrical power. The birds are killed when flying into the path of spinning wind turbine blades. Eagles in flight are especially susceptible to turbine blades as they're attention is often focused on the ground looking for prey rather than looking forward to see obstacles.

The new rule will give legal protection for the lifespan of wind farms and other projects if companies obtain permits and make efforts to avoid killing protected birds. If they end up killing more birds than estimated at the start of the project, additional safeguards for the birds would then kick in. Numbers of eagle kills would be reviewed every five years. Wind power companies would have to document eagle deaths caused by their blades, but that information would not be made public.

Proponents of the plan say it will free up companies to look into expanding wind farms and providing "cleaner" electrical power. Currently there are no protections against eagle kills, which might be limiting building new wind farms. Just last month a company was prosecuted for eagle killings at two wind farms in Wyoming.

Bald eagles were removed from the endangered species list in 2007 but are still protected under two federal laws. Since 2008, official numbers peg eagle deaths due to wind turbine blades at 67. But that figure does not include eagle kills from the Altamont Pass in California, where a large wind farm is believed to kill about 60 eagles a year. Wind turbines can be massive, reaching up to 30 stories tall. Tips of the turbine blades can be spinning at speeds of 170 miles per hour on extremely windy days.

The U.S. Fish and Wildlife Service agrees with the new regulation as it will allow it to more closely monitor the relationship between eagles and wind farms.

So what do you think? Is the price for increased "clean" electricity worth the cost of more eagle deaths? Share your thoughts here with other Science Buzz readers.

Wind catcher: New wind turbines are getting taller and slower in order to generate more electricity.
Wind catcher: New wind turbines are getting taller and slower in order to generate more electricity.Courtesy JMT
The way technology usually works, things get smaller and faster to be more efficient. That's not the case with wind turbines. Read this interesting piece on how new innovations are making wind turbines taller (reaching up into the sky the length of a football field), the blades are getting longer and are moving slower. All of this is actually generating more electricity.

This video was making the viral rounds over the weekend. I think it gives a better understanding about the energy waiting to be tapped from the wind. What do you think?

Dec
16
2011

Ten abandoned mining pits in Minnesota's Iron Range could have new life as pumped-storage hydroelectricity plants, according to a University of Minnesota,* Great River Energy, and Minnesota Power study.

[Hey, now: did you click on the hyperlink above? I don't put hyperlinks in posts for my own amusement, you know. They're for your viewing pleasure and learning enjoyment! Seriously though, click on them for great explanations, photos, diagrams, graphs, and more. You won't be disappointed.]

Match made in Minnesota: Wind and water "play nice" in pumped-storage hydroelectric technology.
Match made in Minnesota: Wind and water "play nice" in pumped-storage hydroelectric technology.Courtesy Steve Fareham

Pumped-storage hydroelectric technology sounds like something from a science fiction movie, but it's really just a neat combination of water and wind energy technology. What makes pumped-storage hydroelectric projects sexy is that they make it possible to store excess energy generated by wind turbines on windy days. This stored energy can then be used during the inevitable calm days -- addressing one of the biggest issues for today's wind energy industry!

How does it work?

It's basic physics, my friends: building potential energy and releasing kinetic energy. Specifically, excess energy generated by wind turbines "is used to pump water from a low-lying reservoir to a higher elevation pool" within the mine pit. This builds the potential energy of the water. Then, when that energy is demanded, "water from the upper pool is released generating hydroelectricity and refilling the lower pool." This releases kinetic energy, which can be turned into electricity.

How effective is it?

Researchers estimated that a pumped-storage hydroelectric facility built in Virginia, MN could output the same electricity as a "modest-sized" generator burning natural gas. However, at a cost of $120 million, the pumped-hydro facility would be more expensive than a comparable natural gas generator.

There are 40 U.S. locations currently employing pumped-storage hydroelectricity technology, but there are no definite plans for any such projects in Minnesota -- yet.

Read the Star Tribune's coverage of this story here.

*Including scientists from UMD's Natural Resources Research Institute, St. Anthony Falls Laboratory, and Humphrey School of Public Affairs; and funded largely by the Initiative for Renewable Energy and the Environment.

Apr
05
2011

Whooping cranes: Can't live with 'em, can't live without 'em.
Whooping cranes: Can't live with 'em, can't live without 'em.Courtesy US Fish and Wildlife
Word on the street is that Xcel Energy has canceled its $400 million, 150-megawatt wind farm project in North Dakota. (North Dakota, if I remember my geography right, is the Dakota directly … above South Dakota. I think.)

The reason Xcel is giving for the cancellation is the same one I give for never going out in the yard without a rake: birds.

The wind turbines, it seems, could pose a potential hazard to two endangered birds: the whooping crane (known to be a silent, thoughtful bird), and the piping plover (known for perching on bathroom windowsills to watch people bathe). The whooping crane is the tallest bird in North America (save that for humiliating your fiancé on trivia night), and its population has been reduced to only about 400 birds, largely due to habitat loss. The piping plover, also a victim of habitat loss, is a shore bird with a global population of just over 6,000 individuals.

Faced with a federal mandate to mitigate the threat to the birds, Xcel, like an unenthusiastic kid who just found out he’d have to bike to a lame birthday party, decided that that the wind farm scene just wasn’t worth the hassle.

It’s too bad, really. Shana explored this issue a couple weeks ago, but the long and the short of it is that it’s a doozy. On one hand, no one wants to see a five-foot-tall crane run into a windmill (if you laugh, you go to Denny’s when you die), but on the other, you have to balance that threat against the chronic environmental effects of fossil fuel use. If both species are vulnerable to habitat loss, climate change probably isn’t going to be a great thing for them. And at least in the case of the cranes, fossil fuel has an even more direct effect on them—the cranes’ only winter habitat, Aransas, Texas, is a regular spot for oil and gas drilling operations. So … they’re able to work that out, but not the North Dakota wind farm?

It kind of feels like that kid was really looking for an excuse not to go to the birthday party. But I suppose we can’t really blame it all on the kid—we should have made sure it was a better party. And, yeah, I can see how having a bunch of birds around would make for a creepy party, but if it was done right it could also be an awesome party with all those birds!

Oh, god, I don’t know what’s metaphor and what’s reality anymore.

Anyway, no more big wind turbine field in North Dakota. What do y’all think about that?

Rivalries are common between college campuses – who's got the better football team, the tastier dorm food or the coolest parties. But in Northfield, Minn., where rival colleges Carlton and St. Olaf are located on opposite sides of the town, there's a growing intense rivalry over wind-power turbines. Read more about it here.

Jun
19
2008

Billionaire oilman T. Boone Pickens is building the world’s largest wind farm in Texas, hoping to produce enough energy to light 1.3 million homes.

If you ever wanted to live like a billionaire, now's your chance – technological advance are making home wind power much more common and affordable.

How do you power your home when the wind isn’t blowing? Through compressed air energy storage. The process is complicated and inefficient, but power companies are working on ways to improve it.