The two connections – HelWin1 and BorWin2 – provide transfer capacity to the German mainland for several offshore wind farms in the North Sea.
Siemens will establish a service base in Lower Saxony close to the coastline for the offshore and onshore converter stations.
The services covered by the contract include preparing the maintenance schedules, coordinating and executing inspections, preventive maintenances and repairs, and providing the related logistics and spare parts management services.
Earlier, Siemens won orders to build these two grid connections in the North Sea.
The BorWin2 grid connection will have a transmission capacity of up to 800MW of clean electric power, and HelWin1 will have a capacity of 576MW.
Both connections will be built using high-voltage direct current transmission technology with submarine cables, and are expected to start operation in 2013.
