Petrofac said it secured a contract from TenneT, the German-Dutch transmission grid operator, to help build the wind farm while Siemens will provide the systems needed to convert wind energy to electricity for the national grid in Germany.
Petrofac, which has headquarters in London, said the transmission station for BorWin3 will be the largest of its kind, with a capacity of 900 megawatts.
Karlheinz Springer, chief executive officer for Siemen's power transmission division, said the pioneering development was based on a legacy of North Sea wind operations.
"BorWin3 will supply nearly 1 million German households with clean electricity from wind power," he said in a separate statement.
Germany aims to rely on wind power to meet the bulk of its renewable energy needs. Commercial operations at the BorWin3 wind farm are expected by 2019.