Norderney cable
OperationalGeneration ExportDE62 MW110 kV66 km2009
Basic information
7 fieldsAlso Known As
NOR-2-1 · NOR-2-1 alpha ventus · Norderney I-Korridor · Norderney I (1. System)
Status
operational
Capacity
62 MW
Owners
Type
generation export
Expected Life
30 years
Website
Supply Chain (1)
Project Timeline (6)
2009Onss Commissioned
In 2009, during the spring to autumn construction phase, the project’s substation (Umspannwerk) was commissioned in parallel with the connection of the sea cable, as part of the grid connection works outlined in the construction overview.
May 2009Commercial Operations Full Power
The Norderney I export cable system connecting the offshore wind farm alpha ventus to the onshore substation at Hagermarsch via the island of Norderney was completed in May 2009 and entered operational service as part of the Offshore-Ist-Netz Nordsee. The system comprises a subsea and onshore cable route that transmits power from the alpha ventus offshore platform, where voltage is stepped up to 110 kV, through Norderney to the mainland grid connection point.
2008Onshore Site Preparation
During the winter of 2007–08, network operator transpower (formerly E.ON Netz) installed cable pipes and a 1.5‑kilometre empty pipe construction beneath the island of Norderney, routing them under existing roads, paths, and dunes to form a multi-duct corridor for nine three-phase and four direct-current connections between offshore wind farms, the island crossing, and the mainland substation at Diele. This trench-based installation through the Wadden Sea National Park created the core under-island ducting used as a transit corridor for multiple grid connections, enabling additional cables to be added later without complex new construction.
1 Jan 2008Cable Installation Complete
Installation of the export submarine cable linking the alpha ventus offshore transformer station to the German power grid via the island of Norderney was completed in 2008. The underwater 110 kV cable, installed by transpower gmbh (formerly E.ON Netz), now carries power from the offshore wind farm over a roughly 60–70 km route via Norderney to the Hager Marsch transformer station on the mainland.
1 Aug 2007Cable Installation Start
After several project delays, engineers began the first cable installation works for the Alpha Ventus offshore wind park’s grid connection in August 2007, laying the connection that was required to run via the junction at the island of Norderney.
1 Jul 2007Onshore Construction Start
In July 2007, one month after the June 2007 contract signing with Multibrid as general contractor for six M5000 turbines at the alpha ventus offshore test field, construction of the grid connection and the cable route on the island of Norderney commenced.