Location: 90 kilometre north of the isle of Borkum
Area: 59.2 square kilometre
Water depth: up to 40 metre
Turbines: 80 BARD 5.0 wind energy converter of the 5 megawatt-Class
Rotor diametre: 122 metre
Hub height: 90 metre
Total height: 152 metre
Total power: 400 megawatt
Production: 1.6 billion kWh per year (supply of approx. 500,000 households with green energy)
Start of construction: April 2010
First power input: Dezember 2010
Commissioning: September 2013
Total investment: more than 1 billion Euros
5 MW Offshore turbines of class 1c with a rotor diameter of 122 m
three roter blades made of plastic on epoxy resin basis with an electronic pitch system
drive train with main bearing and hollow rotor shaft
Wind turbine and tower segment are mounted on a tripile foundation consisting of three piles connected trough a transition piece.
Total height of a single pile varies between 84 and 91 m, depending of the exact location within the wind farm.
The zylinder shaped piles are hollow and its diametre is 3.35 m. The thickness of the walls varies between 40 and 120 mm depending on the soil conditions and the location within the farm.
For errection, the piles are hydraulically hammered into the mud by using the especially desgined Pile Guidance Frame (PGF).
In the next step the cross-bracing is laid onto the piles from above and the junctions are grouted. The grout material is a special concrete which is molded into the space between the bottom end of the cross bracing's pins and the top end of the piles.
Advantages of the tripile foundation over tripod, mono pile or jack-constructions are:
Especially designed for huge water depth and far offshore installation.
Simple and easy to errect construction, most parts of the errection occur above the water line.
Low maintenance effort, most work to be executed above the water line.
Farm external grid connection:
Farm internal grid connection:
Converter platform BARD 1: