Dong Energy will use turbines rated at 6MW or higher for its proposed installation off the Isle of Man in the UK.
With construction scheduled to begin in 2021 and commissioning anticipated two years later, the Danish developer is about to investigate the soil conditions at a site in 15-25m water depths in the Irish Sea.
Wind speeds will also now be surveyed and plans for grid connection for the 700MW project drawn up. Investigations at the site are due to begin this year with the consenting process expected to take place between 2016 and 2018.
The Isle of Man government selected Dong for the project in 2014 after voting overwhelmingly in favour of developing offshore wind projects, highlighting up to 2GW of potential capacity.