It is a paramount priority that cities will get ready for the raising challenges of urbanization and climate change, to reach the overall decarbonisation target and answer flexibly to the ever-changing needs of their citizens. This will require massive and collaborative efforts from the private and public sectors to leverage a common pool of opportunities. Enel X brings to the table half a century of experience in the energy sector and an open approach to innovation, to rethink energy as a key enabler of smart and sustainable city models. The electrification of public services, the digitalization of energy monitoring and consumption combined with cutting edge technological advances are the foundation of renewed and improved urban services. Innovative business models that leverage savings from energy efficiency and ‘as-a-service’ propositions are the engine of this transition.