The first wind turbine has been installed at the Rampion Offshore Wind Farm, 13km off the Sussex coast.
116 wind turbines are being put in place altogether, taking 24 hours each to install.
Once completed the project, by E.ON and Canadian energy company Enbridge, will provide enough electricity to supply almost 347,000 homes a year.
The ship, the MPI Discovery, is bringing the turbines from Esbjerg in Denmark.
Eight turbines can be transported at a time, weighing 200 tonnes each with a height of 80 metres.
Each one is positioned and bolted onto each foundation followed by three blades which measure 55 metres.
Duct trenches were dug along the seabed last year for the cables to transport the electricity to shore.
Once the project is complete, it will provide 60 permanent full time jobs for staff to maintain the turbines.
The project is due for completion in 2018.