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Helsinki [ENERGY]

In a Second World War bomb shelter in Helsinki, a cunning new system has been devised to turn people’s growing reliance on computers into a way to heat their houses. The bomb shelter, which is located beneath a 19th-century Orthodox cathedral, houses a 2 megawatt database server centre run by Finnish IT company Academica. Cooling the machines is expensive, however. So Academica has done a deal with local authorities to swap the heat its computers generate for cold water and free server space.

The water used by Academica to…



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