ComEd issued an alert after receiving an increase of reports about scammers calling customers and falsely claiming their electric service will be disconnected unless a payment is immediately made.
The impersonators instruct customers to buy a prepaid credit card and call back to a different phone number with the personal identification number and other information, ComEd said in a statement.
Other times, the scammers will manipulate the caller ID number displayed on a phone so it appears that ComEd is calling, the statement said.
ComEd said customers with concerns about their bill should call customer service at (800) 334-7661.