The aim of the project is to develop and implement concepts for digital twins for deep geothermal systems. Digital twins (DT) are intended to unite the complete databases of a site (data integration). Initially, the site exploration data (e.g. geology, geophysics, hydrogeology, groundwater properties) will be integrated, and further data sets will be continuously integrated as the exploration progresses so that the digital twin always represents the current state of data and knowledge. Data management (DMS) will be carried out in a combination of geographical (GIS) and geological information systems. On the other hand, various simulation systems will be integrated into the digital twin. Geological modeling (GEO) and process simulation (PCS) will play an important role here. Geological modeling forms the structural-geological and geometric basis for data management and process simulation, which in turn are used, for example, for the interpretation of geophysical measurement data or the subsequent design of in-situ experiments and a geothermal deep system. The concept is embedded in virtual reality (xVR) methods in order to ensure visual, intuitive access to the complex geodata and process data as well as representation in a uniform geological context.