Smart2B aims to create a smart building system, consisting of the Smart2B devices, platform and services, that places citizens, building users and CECs at the heart of the building energy transition, by enabling smart buildings to interact with their occupants and the grid in real-time to untap energy efficiency and local flexibility. This approach will transform the existing building stock into and interconnected active element of the energy system by upgrading existing building equipment, individual buildings and entire building blocks to higher smartness levels.