The city's fire department was called to Domtar mill Saturday night after flames started burning around the electrical transformer.
Spokeswoman Bonnie Skeene says there were no injuries and the flames were doused within a couple of hours.
She says no evacuation was necessary, though production was halted for 12 hours.
Mill safety has been an ongoing issue since an explosion ripped through a sawmill in Burns Lake two years ago, killing two people and injuring 20 more.
WorkSafe BC conducted a botched investigation that produced evidence that the Crown could not use in court, leading Premier Christy Clark to appoint her deputy minister to review the case.
The BC Coroners service also announced it would hold an inquest into the deaths of the fallen workers. (CHNL)