In the last decade, the development of Smart Grids technologies has been enforced by the growing energy demand in the residential sector, as well as the increasing concern about climate changes and the reduction of their consequences. Indeed, one of the six priorities of Von der Leyen commission is to convert the actual energy system into a more integrated, decentralised, and sustainable one. In this context, one of the most promising technologies is NILM (Non-Intrusive Load Monitoring), whose objective is, starting from the aggregate power signal collected in a building with a single smart meter, to disaggregate and distinguish the various household appliances.