This work is expected to start in April.
Eon said that due to the scale of the upcoming work, it will be looking to employ a further 13 staff to join its operations team.
A £3 million (EUR 3.6 million) onshore facility has also been completed at the nearby Grimsby Fish Dock. This will accommodate the operations and maintenance team with offices, stores, a workshop and wind farm control room.
The EUR 880 million Humber Gateway project is located 8km off England's north east coast, and is expected to go online in 2015.