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Appearing like a giant oculus from above, the Gemasolar Thermosolar Plant in Seville, Spain, is a solar concentrator containing 2,650 heliostat mirrors that focus the sun's thermal energy to heat molten salt, which is then circulated to produce steam and electricity.  Reprinted with permission from Overview by Benjamin Grant, copyright (c) 2016. Published by Amphoto Books, a division of Penguin Random House, Inc.
Images (c) 2016 by DigitalGlobe, Inc.
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