ComEd opened its emergency operations center and increased crews in response to an Ice Storm Warning, the utility announced.
"ComEd has developed a plan and is prepared to have the necessary resources available to respond in the event that there are weather-related issues,” said Terence R. Donnelly, ComEd president and chief operating officer, in a statement. "Should there be any impact to our system, our employees will work around the clock to get customers restored quickly and safely."
During a significant icing weather event, any outdoor surface that isn't treated, such as roads, parking lots and sidewalks, will be covered in ice. Even trees could become covered in ice, bringing a risk of limbs breaking under the weight of ice.
ComEd reminded customers Tuesday to take precautions in the event power goes out or power lines go down.
"If a downed power line is spotted, immediately call ComEd at 1-800-EDISON1 (1-800-334-7661). Spanish-speaking customers should call 1-800-95-LUCES (1-800-955-8237)," ComEd said.
ComEd urged residents to never approach a downed power line and "always assume a power line is energized and extremely dangerous."
The utility asked that residents don't approach ComEd crews about restoration times as the area around them could be hazardous.
An interactive outage map is available via ComEd's site.