The THC-Prognos project successfully held its first annual meeting, hosted by GFZ Potsdam, with both in-person and online participation. The meeting focused on project progress andupdates, addressing challenges encountered and outlining the roadmap for the next six months. As part of the 7th Energy Research Program, THC-Prognos aims to enhance hydrochemical characterization for predictive modeling in sustainable reservoir management. Key aspects discussed included the development of a hydrochemical database, Coupled THC modeling tool, and their integration into GeotIS for public access.