In the +CityxChange Project, an Integrated Modelling and Decision Support Tool (DST) analyses energy use at building level; power and transmission of electricity across the electricity network; power required for the e-mobility network and socio-economic factors. Trained users of the DST can analyse scenarios for intervention e.g. energy efficiency upgrades of buildings or installation of renewable energy systems, to understand the impact of these scenarios on carbon and energy reduction targets and on socio-economic factors e.g. health or job growth. The DST is to be used by trained personnel within the municipality to inform development of the Bold City Vision and expansion of the PEB.