On the way to a metropolis without emissions – so the goal of the city of Malmö in Sweden that should be achieved by 2030 at the latest by tapping the underground. Deep geothermal energy is to be fed into the district heating network. The system that the German energy company E.ON is building will use geothermal energy at a depth of 5 to 7 kilometers. The experts from the Munich-based company expect a temperature of 160 degrees Celsius there. Water is pumped into borehole one, which heats up at depth and then exits through a second borehole. The energy is fed into the district heating network via a heat exchanger. The company is now preparing the construction of the first of a planned 5 plants.
The model is a geothermal system in Finland
E.ON is investing EUR 5.4 million in the south-west Swedish metropolis. The Swedish Ministry of Energy is supporting the construction with 1.2 million euros. The Finnish company ST1, which already has relevant experience, is responsible for the drilling. It had a 6.4-kilometer-deep borehole drilled in Espoo, Finland. Well construction company H. Angers Söhne from Hessisch-Lichtenau achieved the feat. It is the deepest well in the world for the use of geothermal energy.
To be precise, two wells were drilled in Espoo. In one of these, water is injected, which is heated in the depth and then exits the second borehole. The thermal energy is fed into the district heating network via a heat exchanger. With the 40-megawatt system, 10% of the needs of the 280,000-inhabitant city can be met.