Power at the Regency Square Mall went out Wednesday afternoon.
The outage was the result of a back surge that shorted out a connection to the JEA system in the area about 3:35 p.m.
There was no estimate on when power would be restored.
Home Depot and a strip mall also lost power, but theirs was restored a short time later.
The mall will have to repair damage to its infrastructure before JEA can restore power there.