Terna S.p.A. is a transmission system operator based in Rome, Italy. It operates through Terna Rete Italia, that manages the Italian transmission grid and Terna Plus which is in charge of new business opportunities and non-traditional activities in Brazil, Uruguay, Peru and Chile. It operates the high-voltage national transmission grid with about 75,000 km of lines, around 900 electrical substations throughout the Italian territory and 26 interconnections with foreign Countries. Its mission is to guarantee 24 hours a day, 365 days a year, the secure operation, quality and efficiency of the Italian electricity system and ensure equal access conditions for all market operators. A centre of excellence made up of over 5,100 professionals, Terna plays a guiding role in the energy transition process towards complete decarbonisation and full integration of energy from renewable sources into the grid.