The transition towards a low-carbon economy is significantly transforming the power system from a unidirectional, centralised and fossil-based system towards a bidirectional, distributed and renewable-based one. In this context, DSOs andTSOs are facing more complex grid operations, including challenges like reverse power flows, additional power flows in transmission systems and grid stability issues. Available tools for grid management in this changing environment have often underperformed for several reasons. INTERPRETER will overcome limitations of existing tools through a modular grid management solution consisting of a set of 10 software applications for an optimal design, planning, operation and maintenance of the electricity grid – with a special focus on the distribution network – that will be offered to grid operators through an open-source interoperable platform. (etc.)