Based on an article by Sven Titz in the NZZ
A pioneering pilot project on deep geothermal energy is being taken forward in the Jura municipality of Haute-Sorne. The aim is to harness the heat of 135 degrees Celsius found at a depth of 4,000 metres to generate electricity for around 6,000 households and to recover residual heat for heating.
- The project utilises the Enhanced Geothermal Systems (EGS) method. This involves pumping water under high pressure into the hard rock to create artificial fractures for water circulation.
- In contrast to the failed 2006 project in Basel, which triggered earthquakes, initial tests indicate that the subsoil in Haute-Sorne is seismically stable. Through gradual stimulation, the permeability of the rock has been massively increased without any noticeable tremors.
- Geo-Energie Suisse AG is collaborating on projects in the USA, such as Fervo in Utah (planned capacity of 100 megawatts by 2027), whilst the technology is still in the pilot phase in Europe.
- Technological advances, such as improved drill bits from the oil industry, have already significantly reduced costs. Geothermal energy is considered promising because – unlike wind or solar power – it provides reliable baseload energy round the clock.
- Following successful tests in 2025, the project managers at Geo-Energie Suisse are now awaiting approval for the second deep borehole.
Link to the article (in German, for newspaper subscribers only)