Definitely a scam - do not respond; the second call from "Security" will never come. Com Ed, like most other utility companies, will never offer such a deal or ask you to confirm personal information over the phone. If I haven't already hung up, I usually say put the offer in my next billing statement or tell me which department I should ask for when I call the general Comm Ed service number.
Also, the IRS telephone scam is cycling through now. The IRS also does not call you to ask for "unpaid taxes" or confirmation of personal information.
Cheers.
Mary Anton