What are the challenges involved in serial production of the new generation of huge offshore wind turbines? So far nobody really knows, as Vestas' plans for a 7 MW turbine are on hold until 2014, and Siemens' 6 MW SWT-6.0 and Alstom's 6 MW Haliade 150 are both still in the testing phase. After winning the French tender for 1.43 GW, Alstom plans to roll out its monster turbine by scaling up its prototype manufacturing facility in St Nazaire, France using lessons learned from automotive manufacturing.