Spain's first HVDC cable links the Spanish peninsula with the island of Mallorca. The electric supply on the Balearic Islands in the Mediterranean comes from two independent systems. These systems were not linked to the Spanish mainland system, which is connected to the European Network of Transmission System Operators for Electricity (ENSTO-E) system. To establish a link between the Balearic Islands and the Spanish peninsula, Red Electrica de Espaha (REE), the Spanish transmission system operator (TSO), awarded two main turnkey contracts: one to Siemens for converter stations and the other to a consortium formed by Nexans and Prysmian for the cable system. These contracts were the start of the Romulo project, comprising a high-voltage direct-current (HVDC) submarine cable interconnection between the Spanish peninsula and Mallorca.
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