The windfarm, which produces a maximum of four megawatts (mw)of power for around 2.000 homes, was previously disabled following damage to a cable, but a replacement has been fitted and power is again being produced on site.
Martin Roberts, construction projects manager for E.ON, said: " The project has been tricky to get right and we've had to work around some rough weather during the last three months or so.
"But now it's great to see the turbines turning and producing power once again."
E.ON has also announced it has received planning consent for its Camster windfarm in Caithness, Scotland.
The proposed farm will have 25 turbines capable of producing 50mw of power.
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