'Stop sign'
5 of 19 from Photos: Wind farm rises up from former coal mine
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A "stop sign" like this was installed underneath each of the 158 turbines. Because the wind farm property was formerly a coal mine, the land is not as compacted as it would have been otherwise. That's why these huge concrete bases, each weighing 1.6 million pounds, are a favorite way of balancing the turbines and ensuring they don't topple in the wind.
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July 23, 2009 10:00 AM PDT
Photo by: Rocky Mountain Power
