We apply a model-based investigation approach in which we establish a soft link between three models (ATLANTIS, HyFlow, ASCANIO), specialized and proven for their respective purpose of investigation. We then develop infrastructure expansion plans for three different scenarios (import/export-orientation, sector coupling, and energy efficiency), which represent the first core outcome of the project. A multi-criteria analysis and - assessment synthesizes technical, techno-economic, macro-economic, and environmental aspects and allows a systematic and comprehensive comparison of the scenarios. The resulting scenario-based transformation pathways represent the second core outcome of the project. A GIS-based and web-enabled map for energy infrastructures, potentials of renewable energies and sectoral energy demands, constitute the third key outcome and ensure a clear and user-friendly presentation of the complex interrelationships.