Even if significant progress has been made towards the Twin Transition, the recent energy crisis revealed the EU energy system’s vulnerability and dependence on external energy sources and highlighted the need for intensifying the integration of RES in electricity, transport and building (heating) sectors. To achieve on this, the energy system shall transform from a centralised/fossil-fuel-based to an energy efficient, RES-based and interdependent system, operating with a high degree of flexibility offered by distributed assets. ODEON is conceived under the principle that this can only be realized through the creation of an inclusive ecosystem of stakeholders characterized a mesh of Data, Intelligence, Service and Market flows, jointly enabling the resilient operation of the energy system under increased RES integration and distributed flexibility. ODEON introduces a sound, reliable, scalable and openly accessible federated technological framework (i.e. ODEON Cloud-Edge Data and Intelligence Service Platform and corresponding Federated Energy Data Spaces. AI Containers, Smart Data/AIOps orchestrators) for the delivery of a wealth of services addressing the complete life-cycle of Data/AIOps and their smart spawn in federated environments and infrastructures across the continuum. It will integrate highly reliable and secure federated data management, processing, sharing and intelligence services, enabling the energy value chain actors and 3rd parties to engage in data/intelligence sharing, towards the delivery of innovative data-driven and intelligence-powered energy services in accordance to the objectives set by the DoEAP. ODEON results will be extensively validated in 5 large-scale demonstration sites in Greece, Spain, France, Denmark and Ireland involving all required value chain actors, diverse assets, heterogeneous grid and market contexts, and multi-variate climatic and socio-economic characteristics to support its successful replication and market uptake.