The contract is for 56 V164 8MW turbines to go to the project, which is located in the German North Sea.
According to Windpower Monthly's data division, WPO Intelligence, the project is located 57 kilometres from shore in depths of around 25 metres. It is set for completion in 2018.
In a statement, Dong said it planned to sign an unconditional order later this year. It said this was conditional upon it making a final investment decision on the project.
Speaking about the decision, Samuel Leupold, executive vice president for Dong, said: "The performance of the 8MW turbine from MV is decisive for us selecting it as the preferred turbine for the Borkum Riffgrund 2 development project."
Borkum Riffgrund 2 was initially jointly owned by Dong and PNE Wind. Dong acquired PNE's 50% share in December 2009.