It depends on the rock formation the project is targeting. If one targets a steam reservoir or a sedimentary rock formation, generaly things are ok (save for th

It depends on the rock formation the project is targeting. If one targets a steam reservoir or a sedimentary rock formation, generaly things are ok (save for this one case in Germany where Earth started to rise [0]). In case you target hot (dry) rock that you need to fracture to increase the heat exchange surface, then more often than not you are going to induce seismicity. It's been well studied in Alsace and some small induced earthquake was felt in Strasbourg and attributed to nearby geothermal developments [1]. [0] https://m.dw.com/en/green-good-intentions-cause-chaos-in-two-german-towns/a-4473382 https://m.dw.com/en/green-good-intentions-cause-chaos-in-two... [1] https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.71/ https://comptes-rendus.academie-sciences.fr/geoscience/artic...