The energy transition will generate a strong transformation of the electricity network, in Switzerland and all over the world. Distribution networks are expected to play a vital role, even though hystorically they have not been designed for this purpose. In order to better study and plan the changes to be made, the ReIne (REseaux INtElligents, French acronym for “Smart Grids”) laboratory has been conceived and built to test various solutions. The actual novelty of this laboratory resides in its intrinsic flexibility, allowing reproducing several grid topologies and different situations of loading and generation. It will allow the on field study of a wide range of smart and micro grid problematics, from short-term and midterm scheduling to very fast dynamics issues of connected devices.