The project comprises 54 of Senvion’s 6.2M126 turbines, the first of which was installed in March.
That same month first power was delivered to the grid in March.
The turbines are approximately 150 metres in height, and were stored, pre-assembled and loaded on the installation vessel, the MPI Enterprise from the Dutch port of Eemshaven.
The wind farm is expected to go fully online by the end of the year, according to Innogy, which owns a 15% stake in the project.
Northland Power own an 85% majority stake in the wind farm.
Pierre Lestienne, managing director and chief financial officer of Nordsee One GmbH said: "Most of the turbines are already feeding green electricity into the grid.
"We are very pleased with our progress so far.
"With another project milestone behind us, we remain focused on advancing the project into commercial operation."