There were more than 3,600 so-called tree emergencies. There are now hundreds of piles of chopped up logs and branches scattered around the city.
some downtown windows were also shattered because of the storm. There is some indication that pebbles used on rooftops to reflect the heat were blown off by the unusual winds and into some windows.
"This is an unusual thing in the way the storm came down. It was bouncing up and down and it just wasn't just a great gust of wind at one time all the way through. We were getting sporadic windstorms, as you could say, throughout the city," said Jose Santiago, OEMC executive director.
ComEd says this was the most damaging storm of the year in terms of outages. It hopes to have everyone's power back on by Tuesday.
ComEd says about 550,000 customers lost power after storms hit Friday with powerful winds and heavy rains. The storm knocked out windows at Chicago's Willis Tower.
As of Monday morning, ComEd was still working to restore power to 4,000 customers in Chicago, 7,000 in the northern suburbs, 2,600 south of the city and 1,100 in the western region.
The Associated Press contributed to this report.