BeFlexible project aims to increase the flexibility of the energy system, improve cooperation between Distribution System Operators (DSOs) and Transmission System Operators (TSOs) and facilitate the participation of all energy-related stakeholders. This will be done through the validation and large-scale demonstration of adapted and proven cross-sectoral services, interoperable data exchange platforms for smart grids operation and the creation of the required system architecture framework that will enable the creation of new business models providing additional value to meet consumers’ needs in compliance with a stable regulatory framework.