All press reviews · 11. February 2026

Deep geothermal energy is seen as key to the energy transition, but its implementation is challenging and, in the case of hydrothermal systems, often involves a high risk of failing to find a suitable site. The Haute-Sorne pilot project demonstrates how these challenges might be overcome – with impressive results from deep drilling, hydraulic stimulation and state-of-the-art monitoring.

All media releases · 03. October 2025

Geo-Energie Jura SA (GEJ) has successfully completed the exploration phase of the Haute-Sorne (Canton Jura, Switzerland) geothermal pilot project. Tests conducted in July in the deep borehole confirm that rock permeability can be increased sufficiently to create a usable geothermal reservoir—while complying with the prescribed seismic thresholds. Geothermal energy is available around the clock, produces no CO₂ emissions, and is an ideal complement to other renewable energy sources.