In Reichstett, a few kilometers north of Strasbourg, Fessenheim, the site of the former oil refinery closed in 2011 is changing: a “rig” (platform) equipped with a powerful arm on hydraulic cylinders, drilled a well for deep geothermal energy. The well drilled to a depth of 4,680 m derives water of the water table at 220 centigrades, the hottest well of France at this depth.
“The first borehole is fetching hot water, the water then goes into a heat exchanger that will form the thermie, before returning to a second borehole, nothing comes out on the surface,” explains Jean-Philippe Soulé, general manager of Fonroche. Geothermal energy to the press.
It will eventually supply the hot water and heating network of the Alsatian metropolis: public institutions, retirement homes, schools, hospitals and a third of the 65,000 housing units of the HLM park.
“It is calculated that the distance between the two boreholes gives 50 years of operation, for a loss of water temperature of 3 centigrades,” said Mr. Soulé.