The weather is being blamed for scattered power outages throughout the Chicago area.
One of the most serious was in Aurora.
The outage started just before one this afternoon when a substation transformer failed.
About 22,000 people were affected, mostly on the city’s Far East side.
ComEd crews moved in quickly to fix the problem and managed to restore full power earlier this evening.
ComEd officials are investigating the exact cause, but haven’t ruled out extreme cold as a factor.