Prysmian has successfully completed the sea trial tests for ultra-deep installation of a 500 kV HVDC MI1 cable at 2,150 m water depth. This is the first time an HVDC cable is laid at such a depth. The cable will be employed for the Tyrrhenian Link, an EUR 1.7 billion project awarded in 2021 by Terna. Under the contract, Prysmian will design, supply, and install a total of over 1,500 km of submarine cables to support the power exchange among Sardinia, Sicily and Campania, thus reinforcing the Mediterranean energy hub.

Jul 15, 2024

Prysmian, world leader in the energy and telecom cable systems industry, has announced the successful completion of the sea trial tests for ultra-deep installation of a 500 kV HVDC MI1 cable at 2,150 m water depth. This is an industry record breaking installation, as it is the first time an HVDC cable is laid at such a depth, setting new market standards.

This non-metallic armoured cable, which was designed with a composite material based on high modulus synthetic fibres, shapes the new generation of cable technology. The use of an innovative armouring solution that in water can be 50 percent lighter than steel, combined with the state-of-the-art Leonardo da Vinci cable-laying vessel, will enable the installation and maintenance of Terna’s Tyrrhenian Link at a water depth of more than 2,000 metres, the deepest ever reached with a power cable.

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The success of the sea trials is the result of many laboratory tests and proves once more the solidity of Prysmian innovations. The same light weight armour technology had been in fact used in 2019 for the Evia – Andros-Tinos interconnection at a water depth of 550 m and in 2020 for the Crete-Peloponnese submarine interconnection project at 1,000 m.

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The cable will be employed for the Tyrrhenian Link, an EUR 1.7 billion project awarded in 2021 by Terna S.p.A. Under the contract, Prysmian will design, supply, and install a total of over 1,500 km of submarine cables to support the power exchange among Sardinia, Sicily and Campania, thus reinforcing the Mediterranean energy hub.