molten salt is a storage medium which stores the heat to then supperheat the working fluid. Its the simplest technology and some companies have actually made solar thermal work at better efficiencies than photovoltais.
http://news.cnet.com/8301-11128_3-20025870-54.html?part=rss&subj=news&tag=2547-1_3-0-20
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with Regards:Vote Julius Assange as Time 2010 Person of the Year
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