The first offshore windfarms will be erected as pilot phases from 2004 onwards. A power range up to 60 GW in total is planned in North and Baltic Sea. Each project has a size of 100 up to 2000MW. The proposed locations of offshore windfarms are mostly between 40 and 100 km away from shore. For the transmission of power to the nearest grid connection the distance onshore has to be added. Decisive facts of planning offshore wind farms are the safe transport of energy to grid connection as well as its energy-management. For the electric transmission system there is High Voltage AC as well as High Voltage DC with several respective solutions available. Substantial aspects of the different transmission technologies show a wide range of parameters which have to be taken into account. Determination of the most economical and technical conception of energy transmission needs thorough investigation. Proceeding from the state of today's technology some specific tendencies can be recognised.
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