Illinois Gas Utility Choice Programs Compared: Nicor, Peoples, North Shore, Ameren

Illinois businesses buy natural gas delivery from one of four major utilities, and each of those utilities runs a program that lets eligible commercial customers take competitive supply while the utility continues to deliver. This article compares those programs conceptually, focusing on the shared structure and on what a buyer should confirm for their own account. It deliberately avoids stating specific fees or thresholds, because those are set by each utility and change; the reliable source is always your own utility's current program materials.

For the mechanics of eligibility and switching, pair this with commercial natural gas choice eligibility and switching in Illinois. For the market foundation, see how commercial natural gas choice works in Illinois.

The Shared Structure Behind Every Program

Despite different names and details, all four programs rest on the same idea. A commercial gas bill divides into delivery and supply. Delivery is regulated and always belongs to the utility, which owns the pipes and meter and handles emergencies. Supply is the commodity, and that is what an eligible customer can source from a licensed alternative gas supplier. The utility then delivers that gas over its system.

In program terms, this is often described as transportation service or a customer-select program: the customer or its supplier arranges the gas, and the utility transports it to the meter. Understanding this shared skeleton makes the four programs far easier to compare, because the differences are variations on one common design rather than four unrelated systems.

Nicor Gas

Nicor Gas delivers to most of northern Illinois outside Chicago. It runs a customer-select and transportation style program that lets eligible commercial customers buy the gas commodity from a licensed supplier while Nicor Gas continues to deliver. As with all of these utilities, Nicor Gas remains responsible for the pipes, the meter, and emergency response regardless of who supplies the commodity.

A buyer in Nicor Gas territory should confirm, through Nicor Gas directly, whether the specific account is eligible, what the current program terms are, and how enrollment and billing work. The structural role is clear; the specifics belong to the utility's own program documents.

Peoples Gas

Peoples Gas delivers to the city of Chicago. It offers a customer-choice program under which eligible commercial customers can take competitive supply while Peoples Gas delivers. The same separation applies: supply becomes competitive for eligible accounts, while delivery, safety, and emergency response stay with Peoples Gas.

Because Peoples Gas serves a dense urban territory, a business should first confirm that Peoples Gas, rather than a neighboring utility, delivers to its address, and then verify eligibility and current program terms with Peoples Gas.

North Shore Gas

North Shore Gas delivers to northern suburbs and Lake County, including the Waukegan area, and operates within the same system as Peoples Gas. Its customer-choice program follows the same conceptual pattern, letting eligible commercial customers arrange competitive supply while North Shore Gas delivers.

Peoples Gas and North Shore Gas are frequently discussed together because of their related operation, but they serve different territories. A buyer should confirm which of the two delivers to a given address, since that determines which program and materials apply. From there, verify eligibility and terms with the utility.

Ameren Illinois

Ameren Illinois delivers to central and southern Illinois, often referred to as downstate. It offers transportation service for eligible commercial gas accounts, again allowing the customer to source the commodity from a licensed supplier while Ameren Illinois delivers it. The regulated delivery role, including maintenance and emergencies, remains with Ameren Illinois.

Businesses in Ameren Illinois territory should confirm eligibility for the transportation program and review the current program requirements with Ameren Illinois, since the specifics are set in the utility's own tariffs and documents.

What to Compare, and What Not To

When looking across these four programs, the productive comparison is structural rather than numeric. Useful questions include:

• Which utility delivers to your address? This is the first and most important determination, because it fixes which program applies.
• Is your account eligible? Each program sets its own eligibility criteria based on account type, classification, and usage.
• How does enrollment and billing work? Programs differ in how supply is arranged and how charges appear.
• What are the current program terms? Any applicable charges or requirements come from the utility's tariffs and can change.

What you should not do is treat any single number, fee, or threshold as identical across utilities. Those specifics are not standardized, and assuming they match can lead to a poor decision. Each utility's own program materials are the authoritative source, and confirming there protects you from acting on outdated or mismatched figures.

Bringing It Together for a Buyer

The practical takeaway is that all four utilities offer a way for eligible commercial customers to take competitive gas supply while the utility keeps delivering, and the underlying structure is consistent across them. The differences live in eligibility, terms, and process, which each utility defines. Start by confirming your delivery utility and your account's eligibility, then evaluate supplier offers using how to compare commercial natural gas supplier offers and think through timing with seasonal timing for commercial natural gas procurement. For the broader context, see the commercial natural gas overview.

Sources

• Illinois Commerce Commission
• Nicor Gas
• Peoples Gas
• Ameren Illinois

This article is educational and does not promise any specific savings, rate, or outcome; program terms are set by each utility and should be confirmed directly with them.