This report presents the Energy Grid modeling framework (E-Grid) developed at ETH Zurich for the SURE project. It builds on identified partner needs, with a primary focus on coupling grid models with the STEM energy system model, while integrating additional synergies across work packages. For electricity, a bottom-up linear nodal transmission model of the European grid is used, with Switzerland represented at NUTS-2 level and key line constraints included. The model can recompute Available Transfer Capacity between Switzerland and neighboring countries under different cooperation scenarios. For gas, a new nonlinear flow model based on a full European dataset enables efficient simulation of normal, stressed, and outage conditions in the Swiss gas network. A web-based visualization tool supports analysis, and initial results highlight the benefits of flexible injections like storage and synthetic fuels. E-Grid extends existing tools with new features, including a hierarchical Swiss-European electricity model, unified gas data, and integrated multi-energy modeling. It enables co-simulation of electricity and gas systems to assess cross-sector impacts. Overall, it provides a strong basis for further collaboration and resilience analysis within SURE.
