The Swedish developer won the tender for the €1bn project, slated to be switched on in 2018, with a bid of €0.1031 ($0.1156) per kWh in February.
"Horns Rev 3 is an important part of Vattenfall's ambitions in the field of wind and particularly on our focus on offshore wind farms," says chief executive Magnus Hall.
It "also gives a clear signal to the world around us that Vattenfall's strategy is to make new investments in renewable electricity generation and to grow in wind".
Japanese-Danish
