Although powerful data center machines consume a lot of electricity, most datacenters’ energy bills are usually inflated by the costs of refreshing the equipment, which generates huge amounts of heat, which in turn calls for huge power systems. Refrigeration to keep things under control.
Installed in a 1950s building for a paper mill, the Nordic data center uses a tunnel system (which, incidentally, was built next to the building) to collect cold ocean water and put in contact with huge radiators Dissipate the heat of the servers. Then this hot water is mixed or chilled water and “returned to the sea at a temperature very close to the original”.