Amrumbank West offshore wind farm is being developed off the Germany coast in the North Sea.
The offshore wind farm will include 80 Siemens SWT-3.6-120 wind turbines.
Power generated by the wind farm will be transferred to the HelWin2 offshore converter station.
HelWin2 is one of ten hubs being built by grid operator TenneT.
Amrumbank West is a 288MW offshore wind farm being developed in the North Sea, Germany. It is located 35km north of Helgoland and 37km west of Amrum.
The €1bn ($1.3bn) project is being developed by E.ON Climate & Renewables. It is E.ON's first commercial wind project in Germany and will produce 720GWh of clean energy per annum, which will be enough to power about 400,000 households.
Construction of the wind farm is expected to start in 2013, with completion and commissioning scheduled for 2015.
The project is expected to cut 740,000t of carbon emissions annually.
Amrumbank West wind farm details
"The wind farm will include 80 Siemens SWT-3.6-120 wind turbines rated at 3.6MW each."
The wind farm will include 80 Siemens SWT-3.6-120 wind turbines rated at 3.6MW each. Turbines will be installed over an area of 32km² in water depths ranging from 20m to 25m. They will be supported by 800t steel monopole foundations with a diameter of 6m and height of 70m.
The turbines will have a rotor diameter of 120m and a hub height of 90m. They will be interconnected through 33kV infield cables with a total length of 86km.
An operations and maintenance facility will be built on the island of Helgoland to monitor the wind farm. The facility will serve as the base for maintenance and operation of wind farms operated by E.ON, RWE and WindMW. It will occupy an area of 10,000m² and include service buildings, workshops and warehouses. Around 150 maintenance specialists will work at the facility.
Grid network for the German North Sea wind farm
Global Tech I (GTI) is a 400MW offshore wind farm being built in the North Sea in Germany.
Electricity generated by the wind farm will be transferred to the 690MW HelWin2 offshore converter station through 8km of cables. The 10,000t converter station will be 27m high and include 98mx42m steel topsides. It is being supplied by Siemens and will use the company's HVDC PLUS technology to transform the electricity generated into high-voltage, low-loss direct current.
The converter station is being built by grid operator TenneT to serve as a hub for future wind farms being developed in the German North Sea. It is one of the ten hub projects being undertaken by TenneT to transport offshore wind power to the German grid network.
Construction of the Helwin2 converter station started in October 2012. The station will be built on an 18m high separate platform. It is expected to be completed by mid-2014 for installation during the third quarter.
An 85km export cable will transfer the electricity from the Helwin2 to a landing point near Bussum. From there, a 45km spur line will transfer the electricity to the onshore coastal converter substation at Buttel. The substation will convert the direct current into an alternating current and transfer the electricity to the grid network.
Contractors involved in Amrumbank West project
"An 85km export cable will transfer the electricity from the Helwin2 to a landing point near Bussum."
Siemens will deliver, install and commission the wind turbines. It is also responsible maintenance of the turbines for the first five years.
Heerema Fabrication Group and Siemens will jointly build the HelWin2, under an engineering, procurement, construction and installation (EPCI) contract from TenneT. Siemens will also supply the coastal converter station.
The consortium of Prysmian and Siemens is responsible for supplying, installing and commissioning the HelWin2 converter station. The €600m contract was awarded by TenneT.
Nkt Cables was awarded a €20m contract to manufacture submarine cables for the wind farm, which will be fabricated at its Cologne production facility.
Siem Offshore Contractors (SOC) was awarded a $60m contract for installation of the inner grid cables. It will also provide associated services, such as cable route survey, route clearance operation and testing. Installation works are scheduled to start in mid-2014.
SOC subcontracted marine survey company MMT to carry out a geophysical cable route survey for the offshore wind farm, for which the latter used its IceBeam survey vessel.
A joint venture of HOCHTIEF Construction, WeserWind and IAG Industrie-Anlagen-Bau Georgsmarienhütte installed a met mast for the project.
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