Cryogenic storage for excess renewable energy 

The BBC reports on the trial of cold storage of energy produced by renewable sources. From the article: 

The cryogenic energy facility stores power from renewables or off-peak generation by chilling air into liquid form.

“When the liquid air warms up it expands and can drive a turbine to make electricity.”

Source: http://www.bbc.co.uk/news/science-environment-37902773

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