Much of Rockwood lost power Monday after a late afternoon transformer problem.
Rockwood Police directed traffic at intersections for several hours until power was restored.
The problem was at Rockwood’s primary substation, said Kendall Bear, Rockwood Electric Utility manager.
Bear estimated 4,000 to 5,000 customers were impacted by the outage.
Two transformers were both de-energized when the breakers that feed them tripped.
One transformer has been isolated and the load switched to the other while TVA runs diagnostics.