The contract – which includes a five-year service agreement – is worth approximately £500m ($829m).

Installation of the 154-metre-rotor machines is slated to start in early 2017.

Dudgeon is located 32km north of the town of Cromer in North Norfolk and owned 70% by Statoil, which will operate the wind farm. Statkraft holds 30%.

"We are proud to convince more and more customers about the advantages of our 6MW offshore machine", said Markus Tacke, chief executive of Siemens' Wind Power division.

"With