Storing energy produced by renewable sources is one of the challenges with this technology. Engineers at Massachusetts Institute of Technology (MIT) have developed a way to power a small city around the clock, not just when the sun is shining.

They call the system “sun in a box,” and it would take heat generated by solar or wind power and store it in tanks of white-hot liquid silicon. When electricity is needed, light from the glowing silicon would be converted to electricity.    

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