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This paper shows the intermediate results of a concept study for a 12 MW offshore wind turbine.Baseline of the concept study is a 6 MW offshore turbine out of the product portfolio of MECAL Wind Turbine Design (MECAL WTD).At the beginning of the investigations it is checked if and in how far the common scaling rules are valid,as scaling from 6 MW to 12 MW means doubling the rated power.Design driving loads are scaled from 6 MW to 12 MW.Further,the main cost drivers for offshore wind power projects and the applicable criteria for concept selection are defined.Based on defined criteria,the most appropriate drive train concept is selected and a reduced load set is simulated.