ComEd officials said they are operating ahead of schedule, and now expects 99 percent of their customers back online by midnight Friday.
However, in the meantime, 105,000 customers are still without power due to the storms that wiped out electricity in Illinois.
ComEd spokeswoman Arlana Johnson said about 81,000 homes remain without power in the northern region of Illinois, by far the worst area.
In addition, she said 17,000 remain without in the western region, 4,000 are out in Chicago and 2,500 remain without power in the southern region.
She said ComEd is expecting 90 percent of customers should be back online by midnight tonight, and 99 percent of the customers will be without power until midnight Friday night. The customers hardest hit will have to do without until sometime Saturday.
She said ComEd restored power to 745,000 customers as of 6 a.m. Thursday morning, and that 800 crews are working 16 hour days in Illinois to bring power back online to everyone.