Hamburg, Germany [RenewableEnergyWorld.com] REpower Systems AG has erected the first of a total of six REpower 5M turbines for the alpha ventus offshore test field. The systems each have a rated power of five megawatts (MW), with a blade tip height of 155 meters above sea level.
The first German offshore project is being built by a consortium of companies consisting of EWE, E.ON and Vattenfall. The alpha ventus offshore wind farm is located approximately 45 kilometers north of the island of Borkum.
At the beginning of September, the world’s largest crane ship “Thialf” anchored six jacket foundations onto previously erected piles in water around 30 meters deep. On one of these lattice structures, which are especially suitable for great water depths, the first REpower turbine was erected. Five additional wind energy turbines are scheduled to be installed by the end of the year.
“We expect that the first turbine will supply power to the electricity grid in the fourth quarter of this year,” reported Norbert Giese, Offshore Director of REpower Systems AG. “Of the 18 REpower 5M wind turbines already erected, we now have successfully installed nine on the open seas, each in water up to 45 meters deep. REpower therefore continues to be the market leader in the sector of multi-megawatt offshore turbines and for installations in deep waters away from the coast.”
With optimum wind conditions, each of the six turbines is slated to supply the electricity grid with around 18 million kilowatt hours (kWh) of power per year. Before erection on the open seas, the hub and three rotor blades were first preassembled in the Dutch base harbor of Eemshaven to form a rotor star. Afterwards, all components of the first wind energy turbine – that is, two tower segments, one nacelle and the rotor star – were transported to the offshore construction site by means of a jack-up barge.