I thought this was an interesting presentation. Several groups around the world are working on energy kites of various types. Two inherent advantages are that high altitude winds are less intermittent and stronger. There's also a company selling kite-sails to reduce fuel consumption in the blue-water shipping industry. Of course, as with virtually all the blue-sky ideas I've seen, it's difficult to estimate this early in the game what the cost-effectiveness will be. These are the types of ideas that should receive the stimulus funding that the Energy Department is dispensing.
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