For all portions (high, medium and low voltage), the grid must be developed in line with the evolution of generation facilities, starting with the need to connect production units, usually located where natural resources are available, with demand that is often located elsewhere. Cross-border interconnections are then necessary to guarantee the resilience of the entire electricity system. In this context, ongoing development of new technology for transmission and more “dynamic” electricity system management will be a key factor, allowing the optimisation of investment in new infrastructure.