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Salt, air and bricks: could this be the future of energy storage?
Start-ups turn to heat over batteries and are aiming to industrialise the practice
Energy storage has a dual purpose: it plugs gaps when the wind drops or the sun stops shining, and it allows users to buy cheap off-peak power and use it when they need it. But there’s growing interest in storing energy in the form of heat – and that’s where the everyday ingredients such as air, salt and bricks come into the picture, because these materials are really good at holding warmth. Unlike much sought-after electrical battery components, salt is widely dispersed, easily extracted and able to store heat with minimal degradation or toxic by-products.
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