A substation problem knocked out power to a significant number of customers on Sunday evening, the Oak Ridge Electric Department reported on its Twitter feed.
However, city workers later reported that temporary repairs had been made and power restored.
Still, there was a higher risk than normal of more power outages, the city said.
Residents and businesses reported outages on Wade Lane, West Hutchison Circle, West Outer Drive, Pennsylvania Avenue, and at Cinemark Tinseltown movie theater and the businesses around it.