The two companies had been jointly developing the Seagreen Alpha and Seagreen Bravo sites in a 50:50 joint venture (JV) since first being granted consent in 2014.
Scottish utility SSE has today (25 September) bought Fluor's stake for £118 million (€131 million).
It now plans to enter Seagreen in the UK’s next contracts for difference (CfD) auction, due to be held in spring 2019.
It has taken full ownership in the project, having requested permission to use 120 turbines at the sites instead of the 150 originally proposed.
Seagreen was initially planned to be 1,050MW, but the JV successfully petitioned to have the capacity limit removed. SSE now states the Alpha and Bravo sites have a "potential capacity of approximately 1,500MW".
Mark Pibworth, SSE’s wholesale director, said: "The Seagreen acquisition aligns with SSE’s ambition to create value from owning, operating and developing clean energy assets and infrastructure."
SSE also owns a 25% share in the 367.2MW Walney offshore wind farm, and half of the 504MW Greater Gabbard project off the UK’s south-east coast. It further owns 40% of the 588MW Beatrice project in the outer Moray Firth in Scotland.