« Links for 09-11-2012 | Main | 'Significantly More Negligence Than Has Been Disclosed' »

Tuesday, September 11, 2012

Wind Power

Is wind power the answer?:

Wind could meet many times world's total power demand by 2030, researchers say, EurekAlert: In a new study, researchers at Stanford University's School of Engineering and the University of Delaware developed the most sophisticated weather model available to show that not only is there plenty of wind over land and near to shore to provide half the world's power, but there is enough to exceed total demand by several times if need be...
The new paper contradicts two earlier studies that said wind potential falls far short of the aggressive goal because each turbine steals too much wind energy from other turbines, and that turbines introduce harmful climate consequences that would negate some of the positive aspects of renewable wind energy. ...
Among the most promising things the researchers learned is that there is a lot of potential in the wind — hundreds of terawatts. At some point, however, the return on building new turbines plateaus, reaching a level in which no additional energy can be extracted even with the installation of more turbines.
"Each turbine reduces the amount of energy available for others," Archer said. The reduction, however, becomes significant only when large numbers of turbines are installed, many more than would ever be needed.
"And that's the point that was very important for us to find," Archer said. ...
"We're not saying, 'Put turbines everywhere,' but we have shown that there is no fundamental barrier to obtaining half or even several times the world's all-purpose power from wind by 2030. The potential is there, if we can build enough turbines," said Jacobson.
Knowing that the potential exists, the researchers turned their attention to how many turbines would be needed to meet half the world's power demand — about 5.75 terawatts — in a 2030 clean-energy economy. ...
Archer and Jacobson showed that four million, five-megawatt turbines operating at a height of 100 meters could supply as much 7.5 terawatts of power — well more than half the world's all-purpose power demand — without significant negative affect on the climate.  ...
In terms of surface area, Jacobson and Archer would site half the four million turbines over water. The remaining two million would require a little more than one-half of one percent of the Earth's land surface — about half the area of the State of Alaska. However, virtually none of this area would be used solely for wind, but could serve dual purposes as open space, farmland, ranchland, or wildlife preserve.
Rather than put all the turbines in a single location, Archer and Jacobson say it is best and most efficient to spread out wind farms in high-wind sites across the globe — the Gobi Desert, the American plains and the Sahara for example.
"The careful siting of wind farms will minimize costs and the overall impacts of a global wind infrastructure on the environment," said Jacobson. "But, as these results suggest, the saturation of wind power availability will not limit a clean-energy economy."

[Brad Plumer has more.]

    Posted by on Tuesday, September 11, 2012 at 12:24 AM in Economics, Environment | Permalink  Comments (33)

          


    Comments

    Feed You can follow this conversation by subscribing to the comment feed for this post.