The company will install six SWT-120-3.6MW, raising the capacity of the Norderhof wind farm in Schleswig-Holstein from 21.6MW to 37.7MW.
The 3.6MW turbine was developed for offshore use, but Siemens said that the near-coast location of the project meant that the turbine is well suited to the site.
The first section of the Norderhof wind farm went on line in 2007. It has a capacity of 16.1MW from seven Siemens SWT-93-2.3MW turbines.
The turbines are expected to go up by late summer 2014, and the contract also includes a 20-year maintenance deal.