ASCEND is an European initiative dedicated to establishing Positive Clean Energy Districts (PCEDs) across Europe. The project's core mission is to combat climate change and promote healthier, smarter, and more inclusive cities. With flagship PCEDs planned for Lyon and Munich, and support for additional cities including Porto, Charleroi, Prague, Stockholm, Budapest, and Alba Iulia, ASCEND aims to set new standards for sustainable urban development. As the chair of Geoinformatics and a key partner in ASCEND, our focus lies in pioneering a KPI Engine that leverages 3D semantic city models and real-time sensor data to monitor energy dynamics within Munich's Harthof district, empowering stakeholders to drive impactful change.