Power is slow to return to some areas after Monday night's storms.
Roughly 41,000 homes and businesses mainly concentrated in the south suburbs were still without power as of Wednesday evening, and some might not see power restored until as late as Friday, according to ComEd.
Intense winds had leveled trees and scores of poles and power lines, in many cases making it hard for emergency crews to even reach equipment.
ComEd estimates about 430,000 customers have had problems with their power since the storms, but it's been restored at about 80 percent of homes and businesses. The power company has 790 extra crews are working on the problem and brought in additional workers from nine states.
In northern Indiana, the electric utility NIPSCO had restored power to about 96,000 of the 120,000 customers affected by the storm by Wednesday afternoon, according to the utility. NIPSCO officials expected to have most of their power restored by Thursday.
-Chicago Tribune reporting