The German energy company’s Irish subsidiary Innogy Renewables Ireland will partner with Irish developer Saorgus Energy on the project, which could include as many as 145 turbines.
Innogy will lead the next phase of development, carrying the Dublin Array through to planning consent, the two companies announced.
Aidan Forde, director of Saorgus Energy, said: "We are pleased that Innogy, with their extensive offshore wind experience are on board with us in the development of the Dublin Array project."
The German utility has a 13.5% share in the 332MW Nordsee One project, built the 353MW Galloper wind farm, which it says "is in the final stages of commissioning", and fully owns the 860MW Triton Knoll wind farm, which was awarded a contract for difference (CfD) by the UK government in September.
Hans Bunting, the chief operating officer of Innogy’s renewables division, said: "These acquisitions are a perfect fit with our strategy to deliver sustainable growth in accordance with Innogy’s financial targets to maximise value for the company and our shareholders, and to generate sustainable renewable energy for customers."
Earlier this month, fellow German utility E.on agreed ‘in principle’ to acquire Innogy from parent company RWE. As part of the deal, "most of "Innogy’s renewable assets will be transferred to RWE, however, while E.on will buy the company’s grid and retail business.
Innogy also plans to merge its UK subsidiary, npower, with Scottish rival SSE, creating a company roughly the same size of UK market leader, Centrica-owned British Gas