Integrys Energy Services, Inc. is now Constellation!

Effective April 1, 2015 Integrys Energy Services, Inc. has changed its name to Constellation Energy Services, Inc. No changes are being made to your contract term, price or terms and conditions of service as a result of this name change. Questions? Please continue to contact your current customer care.

Read the Nov. 1, 2014 press release

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Chicago, Illinois
Electric Aggregation Program from Constellation

City of Chicago Electric Aggregation Program

Congratulations City of Chicago

The City of Chicago's Electricity Aggregation Program has been underway for more than a year, saving Chicagoans millions as compared to what they would have paid ComEd. Additionally, all electricity sourced on behalf of the City's program is from completely coal free resources.

As an eligible City of Chicago customer, you will be automatically enrolled in the program unless you opt-out by January 31, 2015. Once enrolled, you may leave at any time and you will never have to pay any fees associated with joining or leaving the program.

View Pricing, Terms and Conditions:

Select your class of service:  

View sample bill

If you do not want to participate in this program, you may opt-out by January 31, 2015. For additional questions please call 888-802-2885.

*To view your respective Terms and Conditions, please choose the appropriate selections under "View Pricing."

Accessibility notice: For individuals who are deaf or hard of hearing, you can utilize the nationwide 711 dialing feature to contact Constellation. A representative can be reached by anyone by dialing 711 from a telephone or TTY (teletypewriter). For more information about 711, see