In a statement, Northland said the money would be raised through a share offering. The compay said the project's total costs would be around EUR 2.8 billion.
Northland has a 60% stake in the project in the Dutch North Sea after striking a deal to by original developer Typhoon Offshore's 5% holding last month.
The company said is has taken a lead role in completing the remaining outstanding development activities and intends to continue its "active leadership role during construction and into operations".
Late last year, Typhoon Offshore brought in a EUR 200 million loan for the wind farm – EUR 120 million from Danish pension fund PKA and EUR 80 million from Northland Power.