6 MW connected to the grid

The 6 MW direct-drive turbine, with its 120m rotor diameter, is distinguished by its very lightweight nacelle – it weighs only 350t including the rotor. The turbine weighs the same as a 2 to 3 MW-class wind turbine, according to Siemens Wind Power CTO Henrik Stiesdal. The lighter weight saves tower and foundation expenses and reduces the overall cost of offshore power.

The new machine is based on key technologies already employed in the gearless 3.6 MW Siemens turbine. The first series of the new offshore turbines will also be equipped with B58 rotor blades, which are cast in a single mould and therefore have no seams or bonded joints. Siemens says that the turbines will also be service and maintenance-friendly and will be equipped with rappelling platforms on the back of the nacelles for safe access by helicopter.

Additional prototypes will be built this year. Their performance and reliability will be tested over the next two years within the framework of a pilot production run. Siemens says that series production is planned for 2014.

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