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Linking New Jersey and Long Island under the waves


July 2007 - Prysmian Group handed over the Neptune submarine transmission cable between New Jersey and Long Island. Implemented by a consortium of Prysmian and Siemens, the link is now operational after a successful trial period for the benefit of the Long Island Power Authority (LIPA) and its ratepayers.

Thanks to the Neptune interconnection, LIPA can now acquire lower-cost energy in time for the peak summer season, when demand for electricity is highest, meeting the needs of about 600,000 average-sized homes. Moreover, the project provides much-needed electric power and transmission infrastructure to densely populated areas in a cost-effective and sustainable way. 

The Neptune cable was produced in the Italian plant in Arco Felice (Naples) and installed by the Giulio Verne, one of the few high-capacity cable-laying vessels in the world. Designed to carry a rated power of 660 megawatts and not less than 750 MW in exceptional overload, the cable covers a distance of 65 miles. Neptune is the first 500Kv submarine cable ever installed worldwide. 

Thanks to its ability in developing products and systems designed on the basis of clients' specific requirements, Prysmian was also in charge of installing 20 kilometres of 345Kv high voltage terrestrial cables at Long Island, linking the cable to the closest terminal stations.