The aim of the Odysseus project is to develop an Open Dynamic System (ODYS) enabling the 'holistic energy management' of the dynamics of energy supply, demand and storage in urban areas, on top of an open integration platform supporting the integration scenario's for designated urban areas exemplified in the cities of Rome and Manchester. While in Manchester project results will be validated on a mature energy efficiency environment, on Rome it is in the early stages of dealing with energy efficiency in public building. So comparisons among each scenario will enrich conclusions on project results.The concept of holistic energy management covers the monitoring of energy operation in a certain area according to 1) dynamic energy profile information for all relevant 'energy nodes' and 2) the actual conditions and behaviour of all these nodes. Based on integral monitoring of planning and actual information problems can be spot (like deviations) and recommendations for resolution and in general optimization including commercial negotiation processes between the stakeholders (long term decision support). The later especially for real-time but also more tactical or even strategic adaptations (adding or changing nodes, changing connection, profiles, ...).The Open Integration Platform will capture all energy node information required in a "dynamic Energy Profile Card" structured according to a proposed full taxonomy of energy node types and their associated properties and interrelationships. All instance data according to these information structures and these information structures themselves will be stored in an open standards-based and open source-based spatial database accessible via standard interfaces to keep the system flexible, interoperable, adaptable and extensible.Odysseus expected achievements to be reached are:-Integration Scenarios: detailed AS-IS & TO-BE business cases/models featuring: the energy infrastructure including all relevant energy nodes for the area of interest, all relevant activities, information, energy & energy flows (physical system dynamics) & the stakeholders and their supporting software applications-Open Integration Platform: an open information sharing environment (dEPC Server) as central place in the cloud where all dEPC data for urban areas are being managed in an uniform and open way-Holistic Energy Management System (hEMS): providing end-users (district facilities managers, utilities, operators, building managers, ...) with a set of fully interoperable software tools providing holistic dynamic management (energy supply and demand) in urban areas through monitoring and decision-making support-Validation of 1/2/3: integrating all Odysseus parts for real life operations based on a demonstration plan and implementation strategies. The applied integration platform and integrated applications are expected to show increased energy efficiency at the two demonstration sites and a better approach to the hEMS to end-users