The Thermal-Hydraulic-Chemical (THC) Prognostic Modelling project is focused on improving comprehension and control of geothermal resources. THC-Prognos aims to enhance the effectiveness and sustainability of geothermal energy extraction by utilizing sophisticated modeling techniques using extensive hydrochemical data from all over Germany to guarantee a dependable and eco-friendly energy supply for the future. The anticipated results of the THC-Prognos project are diverse, encompassing refined prognostic models for geothermal systems, more data availability via GeotIS, and more informed decision-making about geothermal energy production. The project is a cooperative endeavor that involves multiple partners, each providing their specialized knowledge to different facets of the project.