In a couple of years, utilities will do just about anything to be able to store excess power coming from their future renewable sources, such as wind or solar. The good news is that lately several solutions have emerged from privately-funded startups. One of the solutions found that storing energy inside gravel-filled containers is a good idea, and Isentropic Energy, its creator, is really going to build a prototype.
The Pumped Heat Electricity Storage (PHES) is all about pumping heated and pressurized gas in an insulated gravel-filled container. Basically, their system is made of two such containers, one of them heated up to 500 degrees Celsius and the other one frozen down to -160 degrees Celsius in the process, just like in the picture above.
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Isentropic Ltd.
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