In December 1966, the electricity line that connects Sardinia to Tuscany passing through Corsica was turned on for the first time.
It was 413 km long (121 km undersea cable and 292 km overhead line), and after half a century it continues to represent an electrical bridge from the island to the continent.
The decision to construct such a powerful line was to export the production of hydrothermal electrical energy in excess of the island’s needs
from Sardinia to Italy. Until 1987 the Sa.Co.I connection was bi-terminal and was used exclusively to transmit energy from Sardinia to Tuscany,
using Corsica as a physical bridge for the transfer.
Following the agreement with EDF, a conversion terminal was constructed in Lucciana near Bastia,
which enabled Corsica to use part of the energy transferred by the connection.
The Sa.Co.I thus became the world’s first high-voltage direct-current three-terminal connection,
and was renamed Sa.Co.I 1. After the construction of the Lucciana substation in Corsica, the decision was taken to
rebuild the conversion stations built in the 1960s. Two new substations were constructed, one in the original
site of Codrongianos and the other in Suvereto, in the province of Livorno. The new connection, named Sa.Co.I. 2,
entered into service in 1992 and used the same overhead power lines and cables as the 1966 system.