It will transfer electricity from the Veja Mate and Global Tech 1 North Sea wind farms to the German mainland. The unit comes with accommodation units.
The platform, with assemblies also brought from the neighbouring port of Warnemunde, will be anchored 125 kilometres off the German North Sea coast.
The Siemens equipment on the BorWind Beta will be capable of continuously feeding 800MW of electricity into the German power grid.
"The platform is now taking on a very recognisable shape and we are fully satisfied with the quality of the work," said Wilfried Breuer, CEO of the Power Transmission Division at Siemens Energy. The company commissioned the €500 million platform.
As well as 500 Nordic Yards employees, 150 Siemens people have been engaged during the assembly and trials of BorWin beta.
Both wind farms will generate 400MW each and are located west of Helgoland near the boundary of German and Dutch waters in the German Bight.