Installation of the turbines near Wilhelmshaven is now complete. Commissioning is expected before the end of the year.
Simens said that the project developer Bioenergie Nord chose the offshore turbines because the wind conditions at the site are close to those found at sea.
Dong Energy installed the first Siemens 6MW to be used at a commercial site in August. The company is installing 35 turbines at the 210MW Westermost Rough project in the UK North Sea.