In less than a decade the city of Geneva has been able to design and implement a novel urban energy infrastructure that will help the City accelerate and amplify its sustainability agenda based on infra system integration. An urban infrasystem is defined as the integrated system of both hard and soft infrastructure, with hard infrastructure as the physical roads, bridges and fiber optic cables, and soft infrastructure as the policies and engagement of various stakeholders/political regimes that shape or impact the outcomes of the hard infrastructure (Pincetl 2016). In this case study we briefly review the key features of Geneva's metropolitan areas and its energy and transportation systems; we explain the infrasystem components and basic functions; benefits of integration, the components of acceleration and amplification dynamics and the question of Scale. The case of Genliac project and the extension of Geneva Airport will illustrate the importance of infra-system related tradeoff formulation towards accelerating and amplifying urban sustainability agendas while reinforcing stakeholders engagement and deliberative models.