Hot water can be stored underground and the heat used when needed to keep buildings warm.
Technology of Business reporter
In 1985, as geopolitical tensions began to ease, the caverns were emptied and have remained vacant - until now. The storage available is roughly equivalent to 120 Olympic-sized swimming pools and 11 times bigger than the largest above-ground hot water tank that Mälarenergi has nearby, adds Mrs Granström.This type of thermal storage is just one of several ways of caching warmth in the ground for use later.
Where does the heat come from, though? Burning things. The company has a nearby power plant with furnaces for combusting waste or biomass and turning it into electricity or thermal energy. Mrs Granström says that carbon capture technology, which would reduce harmful emissions from the plant, is not yet in place but that her firm is currently considering installing it.
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