EVELIXIA brings together 36 high profile organizations from 12 EU countries envisioning to realize Buildings as Active Utility Nodes (BAUNs), rendering the EU Building stock as: a) energy efficient; b) connected, by facilitating a two-way communication between the grid and the occupants, capitalizing on flexible technologies; c) smart, by utilizing analytics supported by sensors and controls to co-optimize efficiency, flexibility, and occupant preferences; and d) flexible, reducing, shifting, or modulating energy use according to occupant needs, while considering utility signals. EVELIXIA structures the advancement of its solutions along five Innovation Pathways: IP1: Building-to-Grid (B2G) Services; IP2: Grid-to-Building (G2B) Services; IP3: Human-to-Building Interfaces & Interactivity; IP 4: Systems Interoperability; and IP5: Innovative HW as Flexibility Enablers, which will be integrated, deployed, and validated at 7 large-scale, real-life pilots (GR, RO, FR, FI, ES, AT, DK). During the EVELIXIA platform deployment and validation, different actors (i.e., DSOs, DNOs, ESCOs, aggregators) from various sectors (electricity, heating/cooling, mobility) will exchange data for providing B2G and G2B services and they will participate in the development of Business Models showcasing the economic viability of the solutions proposed. EVELIXIA puts a large focus on social engagement empowering citizens as not only adopters of solutions, but also, as their co-creators applying methodologies for citizen and consumer engagement and advanced human to building interfaces. Key expected outcomes include: 14 scalable B2G/G2B services demonstrated including DSF (implicit, explicit, shifting, etc.), P2P energy trading, portfolio management (day ahead/intra-day), TSO/DSO/DHO, and system planning services; GHG emissions reduced by 17%, increase of flexibility by up to 25%, increase of self-consumption up to 100%, reduce energy consumption by 13.5%, and increase RE generation by 11%.