For deep geothermal projects with a thermal output of more than 5 MW, an environmental impact assessment must be carried out in accordance with legislation. This includes, in a first step, a preliminary investigation with a comprehensive set of specifications for the main investigation. In the main investigation, the environmental impact report, Geo-Energie Suisse AG must prove that it is complying with all the requirements of environmental protection legislation and that the necessary environmental protection measures are being taken.

The most important aspects of an environmental impact assessment for deep geothermal projects are:

According to the law, the seismic risk is not provided for in the environmental impact assessment. However, Geo-Energie Suisse AG is introducing this topic into the environmental impact assessment on its own initiative. Furthermore, the aspect of spatial planning is also taken into account in a geothermal project.