An estimated 43,000 Seattle City Light customers were without power Friday night in North Seattle.
The outage started shortly before 6 p.m., but City Light staff said at 9 p.m. power was restored.
The outage was caused by a breaker failure in a substation, and a City Light crew was working at 8th Avenue Northeast and Northeast 65th Street.
Seattle City Light officials said that crews are investigating if Mylar balloons that hit a power line may have caused the breaker failure.
A view from Chopper 7 showed most of Northeast Seattle without power, with cars going down arterials including Lake City Way Northeast. On Greek Row near the University of Washington, a couch was set on fire and there were reports of fireworks.
Metro cautioned that bus service would be affected in the University District and Lake City. Police reminded people to treat traffic lights as four-way stops. Other neighborhoods without power were Ravenna, Pinehurst, Green Lake, Northgate, and Wedgwood.