SimStadt is a workflow software for urban energy simulationdeveloped at HFT Stuttgart. It is capable to manage and process data of the actual urban situation and future planning scenarios. Such scenarios include energy demand analysis of single buildings, city quarters, entire cities and regions. Further applications are reaching from simulation of heating demand and photovoltaic potential analysis up to simulations for building refurbishment and renewable energy provisioning strategies. With this the simulations platform provides an essential support for urban planners and managers for the definition and coordination to develop a modern city with low carbon emissions.