3:28 p.m. update
The PUC advises that power has been restored to all affected customers.
Original story
The cause of the outage is unknown at this point, but 500 PUC customers are without power in the central part of the city.
The PUC is aware of the outage, which began at approximately 2:43 p.m., and is investigating the cause. Crews have been dispatched to try to fix the issue.
Further details will be added as they become available.