One of the more innovative entries has come from the private company Highview Power Storage in London. At its 350KW pilot plant in Slough, Berkshire, electricity is used to cool air to its liquid state at minus 196C, which is stored in insulated containers. When power is needed, this liquid air can be warmed and converted back to gas to drive electricity generating turbines. Each litre of liquid air expands to 700 litres of gas. With further work done to improve efficiency, Highview believes its “cryogenic” storage system could provide a cheap means of smoothing wind energy supply.

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