Our team at EnergyVille provides expertise for hardware-in-the-loop testing of equipment for electrical power systems, coupled with real-time calculations of electrical networks. This way, we test the interoperability of different devices in realistic test conditions. Such testing procedures are necessary to ensure reliable power system operation. The energy transition has brought about a fundamental change in the behaviour of the power system, with increasing intermittent renewable energy sources, new organisational structures, and faster interactions.