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According to http://gizmodo.com/5824163/worlds-biggest-solar-furnace-starts-more-than-disco-infernos :
“This energy is used in numerous ways, including the generation of electricity via a steam turbine, [making hydrogen fuel](http://en.wikipedia.org/wiki/High-temperature_electrolysis), testing reentry materials for space vehicles, or performing high-temperature metallurgic experiments. The massive maximum temperatures Odeillo achieves even allow for the production of carbon nanotubes and zinc nanoparticles via solar induced sublimation.”
So basically, it’s a 40-year-old testbed for what’s possible with solar condenser technology.