Windy locations that can meet world’s energy demands 100 times over

June 16th, 2009 - 4:18 pm ICT by ANI  

Washington, June 16 (ANI): A new study by scientists at the Carnegie Institution and California State University identifies various locations around the world for exploiting high-altitude winds, which globally contain enough energy to meet world demand 100 times over.

The researchers found that the regions best suited for harvesting this energy match with population centers in the eastern US and East Asia, but fluctuating wind strength still presents a challenge for exploiting this energy source on a large scale.

Using 28 years of data from the National Center for Environmental Prediction and the Department of Energy, Ken Caldeira of the Carnegie Institution’s Department of Global Ecology and Cristina Archer of California State University, Chico, compiled the first-ever global survey of wind energy available at high altitudes in the atmosphere.

The researchers assessed potential for wind power in terms of “wind power density,” which takes into account both wind speed and air density at different altitudes.

“There is a huge amount of energy available in high altitude winds,” said coauthor Ken Caldeira.

“These winds blow much more strongly and steadily than near-surface winds, but you need to go get up miles to get a big advantage. Ideally, you would like to be up near the jet streams, around 30,000 feet,” he added.

Jet streams are meandering belts of fast winds at altitudes between 20 and 50,000 feet that shift seasonally, but otherwise are persistent features in the atmosphere.

Jet stream winds are generally steadier and 10 times faster than winds near the ground, making them a potentially vast and dependable source of energy.

Up to 40 megawatts of electricity could be generated by current designs and transmitted to the ground via the tether.

“We found the highest wind power densities over Japan and eastern China, the eastern coast of the United States, southern Australia, and north-eastern Africa,” said lead author Archer.

“The median values in these areas are greater than 10 kilowatts per square meter. This is unthinkable near the ground, where even the best locations have usually less than one kilowatt per square meter,” she added.

Included in the analysis were assessments of high altitude wind energy for the world’s five largest cities: Tokyo, New York, Sao Paulo, Seoul, and Mexico City.

“For cities that are affected by polar jet streams such as Tokyo, Seoul, and New York, the high-altitude resource is phenomenal,” said Archer.

“New York, which has the highest average high-altitude wind power density of any U.S. city, has an average wind power density of up to 16 kilowatts per square meter,” she added. (ANI)

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