This paper addresses the concept, scope and preliminary results of Portuguese demonstrator (PT demo) of the Horizon 2020 InteGrid project. The demo fully addresses EU policy drivers, namely demonstrating that environmental targets can be achieved through smart grids development with active participation of customers in grid operation and covers two goals: a) demonstrating the role of smart grids in scenarios with high renewable energy sources (RES) penetration; b) integration of the

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... system operator (DSO) role as market facilitator enabling disruptive business models to grid stakeholders including innovative energy services to the grid customers This paper demonstrates the technical feasibility and benefits of low voltage (LV) and medium voltage (MV) grid operation based on flexibility on the top of a smart grid infrastructure.