Credit: Science Daily
A problem with solar energy is that it is episodic: only available in daylight hours. A compounding factor is that even in daylight, power output doesn't match well with peak demand produced by morning & evening meals. Demand for air conditioning on summer afternoons is a better match, but problems remain.
A solution, using cheap materials, may have been found:
Video
http://www.youtube.com/watch?v=RLA2jHcQ32Q
http://nocamels.com/2012/11/israeli-researchers-use-rust-to-store-solar-energy/
http://www.sciencedaily.com/releases/2012/11/121111153755.htm
http://evworld.com/news.cfm?newsid=29159 / soar cell energy power electricity PV photovoltaic photo voltaic solar thermal /
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