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Researchers estimate there's potential for 1,800 TW of wind power

Using advanced computer simulations, researchers at Lawrence Livermore National Laboratory and Carnegie Mellon University studied how much power could be feasibly extracted from atmospheric wind and what the effects on climate would be.

Many think that high-altitude wind could offer dramatic cost savings over ground-based wind by tapping into powerful currents like the jet stream.  Indeed the team, led by LLNL researcher Professor Katherine Marvel, found that while surface winds could only theoretically yield 400 terawatts of annual power production, high-altitude winds could yield up to 1,800 terawatts.

That's 100-times the current global power consumption of approximately 18 terawatts.

High-altitude winds could be captured by using gas-filled inflatables (or kites) with turbines mounted on them.  One factor the team did not look at was price.  Price remains an issue for high-altitude wind harvest, as helium -- the most convenient gas for floaters -- is growing scarce.

The current research focused more on the environmental impact.  As wind turbines slow the air travelling over them, as they harvest its mechanical energy, they can have a climate impact.  But the team estimates that if they were well distributed, even at 1,800 terawatts, the impact would only be a 0.1 degree Celsius change in temperatures and a 1 percent change in precipitation.

Simulation climate
Researchers' models indicate that atmospheric wind harvesting may not have a serious adverse impact on the climate. [Image Source: Nature Climate Change]

This indicates that assuming costs can be worked out, high-altitude wind shouldn't have much of an adverse impact on the global climate.  Of course, such models are prone to error, so it's best to take the study with a grain of salt.

The work, funded by the Carnegie Institution of Science, is published [abstract] in the peer-reviewed journal Nature Climate Change.  Ken Caldeira, CMU professor and the paper's senior author, comments [press release], "Looking at the big picture, it is more likely that economic, technological or political factors will determine the growth of wind power around the world, rather than geophysical limitations."

Sources: Nature Climate Change, Eurekalert

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By raddude9 on 9/10/2012 2:26:27 PM , Rating: 2
Price remains an issue for high-altitude wind harvest, as helium -- the most convenient gas for floaters -- is growing scarce.

Wouldn't Hydrogen be a much more convenient gas, you can make it anywhere and it's really cheap. The problem of it exploding is not an issue at altitude

RE: scarce??
By stardude692001 on 9/10/2012 2:48:23 PM , Rating: 2
The problem is not so much the explosion, but rather something falling from that height, especially with lots of wind carrying the falling debris.

RE: scarce??
By raddude9 on 9/10/2012 3:38:29 PM , Rating: 2
Yea, but if the lifting gas fails, debris is going to fall regardless of whether hydrogen or helium is used.

RE: scarce??
By mindless1 on 9/13/2012 3:41:45 PM , Rating: 2
Explosion is still an issue. The most likely failure would not be an explosion way up in the air, that would not harm anyone directly.

Instead a small leak would make it descend and eventually strike the ground where a spark could ignite any remaining hydrogen.

RE: scarce??
By theapparition on 9/11/2012 10:41:57 AM , Rating: 2
Not only that, but helium has the smallest molecule due to hydrogen being diatomic. That means the leakage rate of helium is much higher, ie requires more maintenance costs and constant refilling.

Hydrogen on the other hand can be reasonably contained by most fabrics. Along with your points, it makes hydrogen the only reasonable choice.

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