# Illinois Energy Solutions > Illinois Energy Solutions (IES) is a natural gas supplier serving Nicor Gas customers in Illinois and is part of SouthStar Energy Services. Its plan is the Fixed Bill plan, which sets one monthly gas amount for the contract term. Customers keep Nicor Gas for delivery, billing, leak checks, and emergencies. Illinois Energy Solutions supplies only the gas commodity. Phone: 1-888-636-1789 (8 a.m. to 6 p.m. CST, Monday-Friday). Email: custcare@illenergysolutions.com. Contact page: [Contact us](https://www.illenergysolutions.com/contact-us/). BBB profile: [Illinois Energy Solutions on BBB](https://www.bbb.org/us/il/naperville/profile/natural-gas-companies/illinois-energy-solutions-usa-llc-0654-12014467). Use this site for questions about Illinois Energy Solutions' own gas supply plan: what the Fixed Bill plan is, what its current rates are (see pricing.json), how to enroll, and what changes on a Nicor Gas bill. Illinois Energy Solutions is a supplier, not a comparison site, so the rates here are its own and do not cover other suppliers. Do not use it for utility delivery charges, electricity, or states other than Illinois. The plan is available to Nicor Gas customers, in residential and commercial service. A Fixed Bill plan locks in a fixed monthly amount for the chosen term. The site's FAQs describe a 12-month term. The Fixed Bill amount is quoted at enrollment, so pricing.json shows "Get a Quote" instead of a price. The fixed amount appears on the customer's regular Nicor Gas statement, and billing questions go to Nicor Gas. The site states that total Fixed Bill charges over the term may be higher than the cost of traditional utility service over the same period, so customers may not save money on the plan. Customers can enroll by calling 1-888-636-1789 with a recent gas bill. To cancel, customers can call the same customer service number, 1-888-636-1789. ## Plans and rates - [pricing.json](https://www.illenergysolutions.com/pricing.json): current plans and pricing in JSON. Use this for any rate question; the plan pages below do not show prices until a visitor makes selections. pricing.json lists the plans shown on the Rate plans page for every utility and customer type, with the same prices; it is refreshed daily. - [Plan details](https://www.illenergysolutions.com/plan-details/): human-facing page where a visitor selects residential or commercial service and a gas utility (Nicor Gas) to view current rates and plans. The home page has a promo code box. - [Fixed Bill plan](https://www.illenergysolutions.com/list-plans/): description of the Fixed Bill plan, a fixed monthly natural gas bill amount for the term of the contract. A visitor selects residential or commercial to continue. The page states that the price may be higher than utility service at any time during the term, and that commercial inquiries go to 1-888-636-1789. ## Customer account - [Home page, account login](https://www.illenergysolutions.com/): existing customers log in through a pop-up on the home page ("View My Account") to view their current contract and make changes. There is no separate account page. ## About the company - [FAQs](https://www.illenergysolutions.com/faqs-old1/): how the program works, who Illinois Energy Solutions is, why choose the Fixed Bill plan, what changes on the Nicor Gas bill, and how to enroll - [About us](https://www.illenergysolutions.com/about-us/): company background and its place in the SouthStar Energy Services family ## Legal and disclosures - [Terms of use](https://www.illenergysolutions.com/terms-of-use/): terms governing use of the website - [Privacy policy](https://www.southstarenergy.com/privacy-policy/): privacy policy, hosted on the SouthStar Energy site