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Harnessing the power of the wind


January 2011 - Prysmian has been awarded a project worth more than € 250 million by the Dutch-German grid operator TenneT for the connection project SylWin1, linking offshore wind farms in the North Sea to mainland Germany. The project sets new technological milestones reaching 864MW of power rating and 320kV DC voltage.

Prysmian  is responsible for the complete supply, installation and commissioning of submarine and land cable connections as part of a larger contract awarded to the consortium of Prysmian and Siemens Energy.  The turnkey connection links the offshore wind park DanTysk, located about 160km offshore, to the mainland with the purpose of transmitting power from renewable sources into the German Grid. 

The SylWin1 project follows the BorWin2 and HelWin1 projects previously awarded and it exceeds the milestones set by BorWin2. The project involves a longer DC cable connection and is the highest-ever rated system for VSC technology with a power rating of 864MW operating at the highest commercially available voltage level of ± 320 kV DC. The SylWin1 project uses extruded HVDC cable technology from Prysmian together with Siemens HVDC Plus® converter technology at the offshore platform and onshore stations.

The interconnection comprises of HVDC subsea and land cable types at a voltage of ± 320kV DC to be supplied by Prysmian along a 159km sea route passing to the east of Helgoland and continuing along a 45 km land route to the land converter station in Büttel, north-west of Hamburg. Extruded 155kV HVAC submarine cable connections completes the connections from the DanTysk offshore wind park transformer platform to the offshore converter platform. The cable system’s configuration also includes a fibre optic cable for signalling and communication purposes. 

The cables and accessories will be manufactured at Prysmian’s European HV factories. Installation activities will commence in 2012 and continue into 2013. The commencement of commercial operation of the HVDC link is planned for 2014.