Supplied by green IT start-up Stimergy, the six ’smart boilers’ are effectively edge platforms. They house 100 servers, which are immersed in an oil-based liquid cooling solution, itself attached to a heat exchange system that connects to the swimming pool’s central heating.

Stimergy’s system will reduce the carbon footprint of Paris by 45 tons a year and save 250MWh of energy over the same time period.