The "Genève Lac Nations" project aims to use the cold water of the Lake of Geneva to meet the refrigerating needs of administrative buildings in the international organizations suburb of the Geneva city. The Lake water is pumped at a depth of 35m, and is available at temperatures of 7 to 9°C in the summer. This commercial GLN network (managed by SIG) will distribute the Lake's cold water to the customer buildings without complementary cooling; thus we called it a Deep Lake Water Direct Cooling network.