Contact Us

If you have questions or concerns regarding Illinois Energy Solutions, please contact us by choosing the method that's best for you.

Illinois Energy Solutions Customer Service

PO Box 3066
Naperville, IL 60566-7066

1.888.636.1789

custcare@illenergysolutions.com

Note: Please use the above contact information if you have questions about your Illinois Energy Solutions service. If you have billing questions, please contact your utility directly. The number is on your natural gas bill.

Large Commercial & Industrial

Michael Presto

michael.presto@southstarenergy.com

Sales Agency Opportunities

Erika Douglas

404.685.4074

erika.douglas@southstarenergy.com

Contact Us:

1.888.636.1789
8 a.m. to 6 p.m. CST, Monday - Friday

Company Info:

About Us
FAQs

Illinois Energy Solutions is not the same entity as your gas delivery company. You are not required to enroll with Illinois Energy Solutions. Beginning on 8/1/2026, the Nicor Gas' gas supply cost rate is $0.36 per therm. The utility gas supply cost will expire on 8/31/2026. For more information go to the Illinois Commerce Commission's free website at www.icc.illinois.gov/ags/consumereducation.aspx.

Enrollment eligibility is subject to Illinois Energy Solutions' credit and payment policies, and other eligibility requirements. The total Fixed Bill plan charges over the term of the plan agreement may be higher than the total cost of traditional utility service over that same period and customers may not save money on the plan. Call us at 1.888.636.1789.