Dutch supplier Sif will provide 47 monopiles for the 94-turbine site, Danish group Bladt Industries will supply 35 transition pieces, while Germany-based EEW will offer 47 monopiles and 35 transition pieces.
The remaining 24 transition pieces will be contracted later this year, developer Ørsted told Windpower Monthly.
Foundation specialist Sif will start production at its assembly facility at the Port of Rotterdam on the Dutch North Sea coast next year. It will be the first time Sif has produced monopiles for Ørsted.
Bladt Industries, meanwhile, said it would begin fabricating its contribution of 35 transition pieces at its site in Denmark "very shortly".
Developer Ørsted, then Dong Energy, won the tender for the Borssele I & II site in July 2016 with a bid of €72.70/MWh.
It was the first time a wining bid for an offshore wind farm had fallen below €100/MWh.