Five energy-efficient piles are being installed between end-May and the beginning of June in the foundations of the future building. They will enable research to be performed on the leveraging of geothermal energy and the mechanical behavior of the foundations. A new crane has appeared on the building site. It will allow the insertion of 20-meter-long metal structures, in one piece, in the wells dug at the back of the future Congress Center. These piles, sunk in concrete, are not only structural and supporting foundation elements, but will also act as heat exchangers. "Half of the CO2 produced in Switzerland comes from buildings. The sub-soil has excellent heat-storing properties.
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