Over 2,000 homes in the Waterside have been hit by a power cut.
The outage was reported shortly after 11am on Friday, March 31.
Northern Ireland Electricity (NIE) is currently working to resolve the problem.
“We are aware of a problem in the #BT47 area. We are dispatching engineers and hope to have power restored 2.15pm. Sorry for any inconvenience,” it said.