The substation was lifted into position by the Seaway Heavy Lifting vessel Stanislav Yudin and is currently being cabled-up at the site off eastern England.
The wind farm will comprise 35 of Siemens' 6MW offshore turbines – the first commercial deployment of the new machine.
Turbine installation is due to begin in the summer, said Dong, with the project due to be fully operational next year.
Dong