Offshore-Wind
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No experiences have been made anywhere in the world with the construction and operation of offshore wind parks at a comparable depth and at such a great distance from the mainland. The experiences made here will be of prime importance for the further development of offshore wind energy in Germany, as technological challenges can only be met once the first test turbines have been put to practical use.
| Operator | DOTI |
| Site | Exclusive Economic Zone (EEZ) |
| No. of Turbines | 12 |
| Nominal Capacity | 5 MW per Turbine |
| Total Capacity | 60 MW |
| Foundation | Tripod-/ jacket-style foundations |
| Water Depth | 30 m |
| Distance from Coast | 45 km |
| Length of Cable | 60 km |
| Connection Point | Emden in Lower Saxony |
1999-2001: Application by PROKON Nord GmbH for the construction of the Borkum-West wind park
2001: Approval by the Federal Maritime and Hydrographic Agency (BSH)
2005: Establishment of the offshore wind foundation Stiftung Offshore-Windenergie. PROKON Nord GmbH sells the utilization rights to the foundation
2006: Establishment of DOTI GmbH & Co. KG to erect the wind park
2006: Lease contract between DOTI and Stiftung Offshore-Windenergie
June 2007: Multibrid Entwicklungsgesellschaft mbH is signed up as general contractor for the construction and erection of six M5000 wind turbines
July 2007: Construction of grid connection and cable lines begins on Norderney
January - July 2008: Installation of the tripods for the M5000 turbines
July - August 2008: Construction, erection and assembly of the upper and lower parts of the substation jacket
15 / 18 August 2008: E.ON Netz starts laying the submarine cable
19 September 2008: Pile driving and building works commence at sea
27 September 2008: Completion of substation
24 November 2008: Contract signed for six Repower 5M turbines
16 December 2008: Dr Claus Burkhart (EWE) replaces Wilfried Hube on the management board of DOTI
From April 2009: Laying of foundations for AREVA Multibrid M5000 turbines; subsequent erection of M5000 turbines
From mid June 2009: Erection of six Repower 5M turbines
Stiftung Offshore Windenergie holds the rights to the approved test field and lets sites for wind turbines to operators. It presides over the process between manufacturers, DOTI and the Federal Maritime and Hydrographic Agency (BSH), provides the general public with information and is involved in the political processes.
The foundation’s board of trustees is composed of banks and financing companies, construction companies and suppliers, energy supply companies, offshore wind turbine manufacturers, wind energy lobbies, regional wind energy business associations, other organizations and associations, insurances, the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU), which has prime responsibility for offshore wind energy, the federal ministry responsible for maritime shipping and ocean traffic and the ministries of the coastal Länder Bremen, Hamburg, Mecklenburg-Vorpommern, Lower Saxony and Schleswig-Holstein primarily responsible for offshore wind energy and any related issues.
The DOTI syndicate of operating companies, which comprises E.ON Energy Projects GmbH, EWE AG and Vattenfall Europe New Energy GmbH, buys the turbines from the manufacturer, rents the site in the test field and concludes contracts for maintenance, operation and ongoing development with the manufacturer.
The transmission network operator transpower stromübertragungs GmbH is supplying the 60km connection to the grid connection point in Emden in Lower Saxony.
Two types of turbine and foundation are being put to the test in alpha ventus: the operator will erect six REpower 5M turbines on jacket foundations and six Multibrid turbines (M5000) on tripods are also planned. While Repower turbines are already generating electricity in Beatrice Wind Farm off the coast of Scotland, the use of the M5000 turbines will constitute an offshore first.
[German]