More than 19,000 Commonwealth Edison customers remained without power Monday morning after severe thunderstorms and at least one tornado tore through the area on Sunday night.
ComEd said in a statement that crews are field-assessing damage and trying to restore power "as quickly as possible."
The utility said the best way to stay updated on outages is to keep an eye on the alerts portion of ComEd's website. Anyone who encounters a downed power line should immediately call ComEd at 1-800-EDISON1 (1-800-334-7661).
According to figures issued Monday morning from the utility, 19,806 customers were affected by power outages.
Get Chicago local news, weather forecasts, sports and entertainment stories to your inbox. Sign up for NBC Chicago newsletters.
Here are the numbers of customers without power as of 8:21 a.m.:
Cook County: 8,950
DeKalb County: 105
DuPage County: 9,316
Kane County: 687
LaSalle County: 56
Will County: 347
Massive storms and at least one "confirmed large and extremely dangerous tornado" tore through the Chicago area late Sunday night, according to the National Weather Service, leaving a path of damage and destruction in its wake.