The project, which will use Siemens turbines, will become the second biggest offshore wind farm in the world. The biggest will be the 1GW London Array.
Last year, RWE signed a to build an offshore facility at the Port of Mostyn, north Wales, as part of its plan to develop the project.
It also signed a three-year £5 million contract with Cammell Laird Shipyard to provide port and quayside facilties, and to load and fit out the foundations of the offshore wind turbines.
Gwynt y Mor is owned by RWE Innogy (60%), Stadtwerke München (30%) and Siemens (10%). It is expected to start producing electricity by 2013. Overall completion is set for 2014.
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