Using sustainable and renewable energy resources is becoming more and more important. One of these resources is the use of wind energy. During the past 20 years wind energy technology has experienced remarkable development. More than 50 countries world wide are harnessing wind energy. In 2005 there were about 8,525 MW installed in Europe and 12,175 MW world wide. The accumulated capacity at the end of 2005 was of the order of magnitude of 65,000 MW (2). The main growth market is still Europe, followed by the USA and by Asia. In Europe the countries with the highest figures are Germany, Spain and Denmark. At the end of 2005 in Germany an accumulated power output of about 18,000 MW was installed (2). In Europe it is becoming more and more difficult to find suitable onshore locations for wind parks. As a consequence offshore locations are now being used. The advantages of offshore parks are the higher energy potential due to the higher wind velocities. But some disadvantages have to be faced especially regarding economic aspects due to the much higher investment and maintenance cost. Therefore a balance between the advantages and the disadvantages has to be found. As one of the consequences larger wind mills with rated power outputs of at least 5 MW are under development. Fig. 1 shows such an offshore wind park.
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