The geothermal and reservoir geomechanics group develops research activities aimed at promoting the development of geothermal energy in Switzerland and worldwide. The main focus is on developing techniques for characterizing rock masses and exploring reservoirs, and investigating the thermo-hydro-mechanical coupled processes that take place within them. This involves fundamental developments such as understanding the stress field and its heterogeneities in the earth’s crust, and studying flow in fractured media under variable stress fields. The study of fault stability in the context of natural or anthropogenic variations in fluid pressure is also part of the research group’s field of activity. In terms of applications, the group is developing in-situ stress measurement techniques and investigating thermal-hydraulic coupled processes for subsurface heat storage activities. The geothermal and reservoir geomechanics group organizes geothermal training courses and contributes to geothermal outreach activities.