Constellation           Integrys Energy Services

Integrys Energy Services, Inc. has joined Constellation!

What does this mean to Integrys customers? No changes to service or contracts at this time. We will be merging our companies and processes to ensure seamless service and a postive customer experience. We will keep you informed of our integration progress.

Please continue to contact your current customer care and sales resources.

Read the Press Release (PDF)                  Learn More (PDF)

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Chicago, Illinois
Electric Aggregation Program from Integrys Energy

City of Chicago Electric Aggregation Program

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Congratulations City of Chicago

The City of Chicago's Electricity Aggregation Program has been underway for more than a year, saving Chicagoans more than $30 million 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 we are always looking for ways for more Chicagoans to benefit from this program, the City and Integrys worked to improve the program’s rate structure.

Participation Is Easy

If (a) you were with another supplier at the time of the opt-out and your contract has now expired or (b) you previously opted-out of the program and would like to enroll, you can enroll now via this website.

Enroll Now in the Chicago Aggregation Program

Once you have made your selection(s) above, a table will appear below. The table shows how much you would be charged for each kWh (5.299¢ per kWh plus your Monthly Customer Charge) at various consumption levels under each rate plan.

There are no enrollment or switching fees.

If you have any questions, please call Integrys Energy Services, Inc. toll-free at 888-802-2885. Customer service representatives are available 7 days a week, 24 hours per day. Although the City of Chicago is offering this program, we ask that you direct all your aggregation program questions to Integrys Energy Services, Inc.

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

Exelon Corporation also owns Commonwealth Edison Company (ComEd). Constellation is not the same company as ComEd. The prices of Constellation are not regulated by the Illinois Commerce Commission. You do not have to buy Constellation electricity or any other product in order to receive the same quality regulated service from ComEd.