The first – liquid air technology – is a hugely promising method of storing ‘wrong-time’ renewable energy without the need for expensive and geographically constrictive pumped-hydro plants, and one Bishop Stortford engineer is even working on a liquid air engine for use in transportation. The idea of liquid air as an energy vector is not new. Scientists first liquefied air in 1883, and within 20 years the Liquid Air Car Company had produced a vehicle that would run on it.

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