The first of35 monopiles was put in place by installation vessel GeoSea Innovation.
The foundationswill support the wind farm’s 6MW Siemens offshore wind turbines when they go inlater this year – the first major commercial deployment of the new machine.
Constructionis being managed out of the east of England port of Grimsby.
Duncan Clark, Westermost Rough'sprogramme director said: “This is a significant point on the project, and thefirst foundation installed really kicks off a critical time for construction.