Parabolic troughs at Andasol solar power station, Europe's first commercial parabolic trough solar thermal power plant, using tanks of molten salt to store solar energy, thus generating electricity even when the sun isn't shining, near Guadix, Andalusia, Southern Spain. Andasol 1 went online in 2009, and now the 3 power plants at Andasol make up the largest solar power station in the world. Picture by Manuel Cohen
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