Geothermal energy seems to be a good replacement for a part of the currently used nuclear energy in Switzerland. The idea itself is quite simple: pump cold water into the earth’s crust, allow it to be heated by earth heat, and pump up the hot water to exploit its heat, for example in a power plant. However, there is a catch. In 4-5 km the permeabilty of the rock is low and need to be enhanced through high pressure fluid injections. This pressure increase can cause induced seismic events.