SAPEI is a ±500 kV, 1,000 MW bipole HVDC link consisting of about 420 km of submarine cable and 15 km of land cables between Fiume Santo (Sardinia) and Latina (Italian mainland). The cable system was manufactured and installed by Prysmian, using its cable lay vessel Giulio Verne, and reaches a maximum sea depth of about 1,600 m in the Tyrrhenian Sea.
Prysmian led the HVDC cable system for the SAPEI interconnector linking Fiume Santo in Sardinia with Latina on the Italian mainland. The system comprises approximately 420 km of submarine route and 15 km of land route, configured as a +/-500 kV, 1,000 MW bipole with two parallel cables, making the Tyrrhenian Sea crossing the deepest operational power cable in the world at around 1,600 m water depth. Of the total 840 km of subsea cable required (420 km x 2 poles), Prysmian manufactured approximately 515 km at its Arco Felice factory, with the remaining 325 km manufactured by Nexans at its Halden factory. Prysmian carried out the full marine installation using its cable-lay vessel Giulio Verne and supplied 30 km of land cable for the two-pole link.