by Stacy Feldman -
Apr 29th, 2009
You can't cast a stone without hitting a story on Spain’s influential solar sector, and this week is no exception.
Spain-based Abengoa announced it had started operations at the world's largest "solar power tower" – a 20 MW, concentrating solar plant (CSP) near Seville.
The massive installation is called PS20, and its technology is one to watch. In fact, that power tower you see here could be the future of utility-scale solar. Here's how it works:
Over 1,200 movable mirrors, or heliostats, spread over hundreds of acres of desert land, reflecting sunlight onto a receiver at the top of a central, liquid-filled, 531-foot tower. Concentrated rays heat the water, creating steam to drive a turbine that produces power for 10,000 households.
The PS20 is Abengoa's second go at bringing a solar tower online. The first – the 11-MW PS10 – was fired up to great fanfare in 2007. It sits some 15 miles west of Seville and powers 5,500 homes.
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