MHI Vestas will supply V164-8.0MW turbines from its UK factory on the Isle of Wight.
The Walney Extension offshore wind development project will be developed in two phases, each with a capacity of 330MW.
Dong Energy Wind Power executive vice president Samuel Leupold said: "The performance of the V164-8.0MW wind turbine has been a decisive factor in our decision to choose it for phase 1 of the Walney Extension development project.
"A competitive market for all components is essential to the industry in order to lower the cost of offshore wind power. I appreciate MHI Vestas Offshore Wind’s efforts in establishing production close to the site and manufacturing the blades for the Walney Extension project in its UK factory on the Isle of Wight."
The extension project is located about 19km off the English east coast, next to the 367.2MW Walney offshore wind farm.
Construction work is expected to commence in 2016 but a final investment decision is yet to be made.
In November 2014, the UK government approved the extension project, which features inter array cables, offshore and onshore export cables within an export cable corridor and offshore and onshore substations that will link the project to the National Grid.
