With the growing relevance of distributed renewable energy sources (DRES) in the generation mix and the increasingly pro-active demand for electricity, power systems and their mode of operation need to evolve. evolvDSO will define future roles of distribution system operators (DSOs) on the basis of scenarios which will be driven by different DRES penetration levels, various degrees of technological progress, and differing customer acceptance patterns.The evolvDSO consortium addresses the main research and technology gaps that need to be solved for DSOs to efficiently fulfil their emerging and future roles in the European electricity system. The new tools and methods will encompass a wide array of DSO activities related to planning, operational scheduling, real-time operations and maintenance. Selected methods and tools developed during the project will be validated in computer simulations and real-life testbeds to maximise their deployability, scalability and replicability. Beyond this holistic, top-down approach, evolvDSO is unique in that it brings together the key actors of the electricity value chain that are at the forefront of smart grid development, and with a clear common view on what is needed for further DRES integration in Europe. The consortium consists of 16 partners including DSOs, TSOs, renowned research institutions and new market players that provide unique expertise to achieve the stated objectives.evolvDSO will contribute to the transition to a more sustainable European energy system by maintaining and increasing the security and reliability of distribution grids facilitating the increased feed-in of DRES. The results of evolvDSO will drive the implementation of the EEGI roadmap and ultimately provide a significant impetus for reaching EU climate targets. The project will establish strong links to the realization of smart cities, thus contributing to the EC initiative “Smart Cities and Communities”