The area first lost power Saturday afternoon after a high voltage cable caught fire.
A manhole started smoking when the cable burst into flames.
Mayor Ras Baraka is urging residents to remain patient while crews work to restore the power. About 1,100 customers were still in the dark Sunday morning.
"There's no need for people to evacuate or panic or anything like that, " said Baraka. "The lights will be out for a little while but we're working with PSE&G to get them turned back on. It's a very serious event so it's going to take us a minute to get this recovered back to normal."
Shortly before 3 p.m. Saturday, Newark firefighters and police responded to the downtown area after reports of smoke. Officials say the cables caught fire after one of them failed.
Power was knocked out from Central Avenue to Commerce Street and from Norfolk Street to Broad Street.
Crews working to restore power after major outage in Newark
Traffic signals were also affected on the following streets:
From Central to Broad, Halsey, Washington, University, Martin Luther King Blvd., Lock, Norfolk;
From Warren to Washington, University and Martin Luther King Blvd.;
From Raymond to Blvd. to Washington, Halsey and Broad Street;
From Broad to Prudential Center, New and Rector Streets
Mayor Baraka said there will be increased patrols in areas with no power.
NJPAC tweeted that an Eric Johnson concert for Saturday night was canceled due to the outage.
Baraka urges anyone emergency issues to call 973-733-4311 - if there is a real emergency, call 911.
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