In this May 19, 2006 file photo, a group of 260-feet tall wind towers are silhoutted against a bright orange sky at the Elk River Wind farm near Beaumont, Kan. The spinning blades atop 200-foot towers might appear to the naked eye as ... well ... spinning blades. But to Doppler radar, wind farms appear as a splatter of green, yellow, orange and red _ much like a violent storm or even a tornado. (AP Photo/Charlie Riedel, file)
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