When hydrogen is sent into the solid, the reaction creates enough heat to make a filling station very uncomfortable.

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One being tested at Victoria station pumps river water through heat exchangers.

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Whiting Bay Hall and Auchrannie Spa and Country House, in Brodick on Arran, are open for residents with power, heat and refreshments, while Lamlash fire station is also open all day with power available through a local generator.

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IMechE says this process is only 25% efficient but it is massively improved by co-siting the cryo-generator next to an industrial plant or power station producing low-grade heat that is currently vented and being released into the atmosphere.

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The biomass power station would burn rubbish, animal manure, woodchips, seaweed, corn stalks and other wastes, to heat water to create steam to turn turbines to produce around 300 megawatts of electricity.

BBC: NEWS | UK | Wales | North West Wales | Power station 'deal to save jobs'