Wind turbines are again producing power at the giant Nissan car plant on Wearside, a month after one of the six machines burst into flames.
Eight fire crews attended the Sunderland car plant after fire broke out on one of the 167ft (51m) Danish-built turbines on 23 December.
After safety tests the remaining five turbines have now been restarted.
A spokeswoman for the company said a report into how the fire began was due to be completed within days.
Building work started on the £2m wind farm at the 750-acre site in September 2005.
Planning permission was granted for seven turbines, but the company decided on six second-hand turbines, which together produce 7.5% of the plant's electricity needs.
The spokeswoman said: "We have had a thorough independent safety test of the remaining turbines and they have been declared fit to use.
"The damaged turbine is still with the manufacturers in Denmark and we are awaiting a full report from our insurers, which is due within the next few days."
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