The Nordex N80 2500 came down on 2 January at the Screggagh Windfarm in County Tyrone.
The 20MW plant has remained on shutdown since the incident, but will restart tomorrow after being declared safe, said its operator.
A statement from the Screggagh Windfarm operating company said: “Nordex has concluded its interim investigation and confirmed that this was a unique fault concerning the wind turbine blade control system.
