FILE - This Aug. 13, 2014 photo shows an array of mirrors at the Ivanpah Solar Electric Generating site in Primm, Nev. The largest solar power plant of its type in the world, promoted as a turning point in green energy, isn’t producing the expected energy and one of the reasons is as basic as it gets: The sun isn’t shining as often as expected. (AP Photo/John Locher, File)
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