As Scotland announces the building of 17 enormous wind farms off its coast, we look at the novel solutions for storing the electricity they will produce
However, the future for Gravitricity isn’t above our heads, but beneath our feet. The company is currently picking a site in a former coal mine in the Czech Republic and another location in Europe to build its first megawatt-scale schemes. “All of our future projects will be underground,” says managing director Charlie Blair. Building cranes isn’t cost effective, in his opinion.
Another approach is to compress or liquefy air when there is plenty of renewable electricity, store it in tanks, and then expand or heat it to turn a turbine and release energy later. UK-based Highview Power has already built a small demo liquid air plant, and should have a 50 MW oneAnother idea is the vanadium flow battery, which consist of two tanks of electrolytes separated by a membrane.
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