Commercial Natural Gas Choice: Eligibility and Switching in Illinois

Illinois lets many commercial customers choose who supplies their natural gas commodity while their local utility continues to deliver it. For a business owner, the idea can sound more disruptive than it is. Nothing physical changes at your building, service does not stop, and the utility you already know keeps handling the pipes and any emergencies. This guide explains who is eligible, how enrollment and switching work, and, just as importantly, what does not change when you switch.

If you are still deciding whether to shop at all, start with how commercial natural gas choice works in Illinois. When you are ready to evaluate offers, see how to compare commercial natural gas supplier offers.

The Two Halves of a Gas Bill

Every commercial gas bill in Illinois splits into delivery and supply. Delivery is the regulated service of moving gas through the utility's pipes to your meter, and it always belongs to your utility. Supply is the commodity, the gas molecules themselves, and that is the part choice is about. When you exercise choice, you are changing only the supply half. The delivery half stays with the utility no matter what.

This split is the key to understanding eligibility and switching. Because delivery is a regulated monopoly, you cannot shop it and you do not need to. Because supply is open to competition for eligible accounts, that is where an alternative gas supplier can come in.

Who Is Eligible

Eligibility for gas supplier choice runs through your delivery utility's customer-choice or transportation program. The four major Illinois commercial gas utilities each operate such a program:

• Nicor Gas, serving most of northern Illinois outside Chicago.
• Peoples Gas, serving the city of Chicago.
• North Shore Gas, serving northern suburbs and Lake County, including the Waukegan area.
• Ameren Illinois, serving central and southern Illinois.

Nicor Gas and the Peoples Gas and North Shore Gas system run customer-select and transportation style programs, and Ameren Illinois offers transportation service for eligible commercial gas accounts. Whether your particular account qualifies depends on the program's rules, which can turn on account type, service classification, and usage. The reliable way to confirm eligibility is to check with your own utility rather than to assume. Licensed alternative gas suppliers can also tell you whether they serve accounts on your utility's program.

How Enrollment and Switching Work

Switching is a paperwork and billing process, not a physical one. At a high level, the steps generally look like this:

1. Gather your account details. Pull a recent utility bill and note the account number, service address, rate or service classification, and usage history in therms or dekatherms. Twelve or more months of usage helps a supplier quote accurately.
2. Confirm eligibility. Verify with your utility that the account is eligible for its choice or transportation program, and confirm any program-specific requirements.
3. Select a licensed supplier and offer. Choose a licensed alternative gas supplier and agree on a supply price and contract terms. Illinois maintains oversight of licensed suppliers, and the state's Plug In Illinois resource is a starting point for understanding the choice framework.
4. Enroll. The supplier submits your enrollment to the utility. You typically provide authorization consistent with the utility's program and the supplier's agreement.
5. The switch takes effect. The change generally becomes active on an upcoming meter-read or billing cycle. There is no service interruption and no equipment change.

Because the transition is administrative, you will usually see the change appear on your bill rather than notice anything at the meter. Timing depends on your utility's cycle, so ask the supplier and utility when the first supply bill under the new arrangement should arrive.

What Changes and What Does Not

It helps to be precise about the effect of switching.

What changes: the supply portion of your bill. Instead of the utility's default commodity charge, your bill reflects the price and terms in your supplier agreement. Depending on the program, the supplier's charge may appear on the utility bill or be handled through the utility's billing arrangement. The commodity line is the only economic piece that moves.

What does not change: almost everything else. Your delivery utility still owns and maintains the pipes and the meter, still reads the meter, and still responds to leaks and emergencies. You still call the same utility if you smell gas. The regulated delivery charges continue as before. Reliability, safety, and emergency response are not affected by which company supplies your commodity. For a fuller line-by-line view, see deconstructing commercial natural gas bills in Illinois.

This division is deliberate. The competitive market was designed so that opening supply to choice does not touch the safety-critical delivery system, which remains regulated for exactly that reason.

Documents and Details to Have Ready

Enrollment goes more smoothly when you have the essentials in hand:

• A recent utility bill showing the account number and service address.
• Your rate or service classification.
• Usage history, ideally twelve or more months, in the units your utility bills.
• The details of any existing supplier contract, including its end date and any early termination terms.

The last item matters if you are already with a supplier, because switching again may be governed by your current agreement. Read those terms before enrolling elsewhere.

Returning to Utility Supply

Choice runs in both directions. Customers can generally return to the utility's default commodity service, subject to the terms of any supplier contract and the utility's return rules. If you signed a fixed term, an early exit could carry a termination charge, so weigh that against your reasons for returning. Confirm the specific return process with your utility so there are no surprises.

Deciding Whether to Switch

Eligibility and a smooth process are necessary conditions, but they are not by themselves a reason to switch. The decision still rests on whether a supplier's offer, once normalized and compared fairly, suits your business better than your current arrangement. Use the comparison and timing resources to evaluate that, and lean on the commercial energy procurement overview for the bigger picture.

Sources

• Plug In Illinois
• Illinois Commerce Commission
• Nicor Gas
• Ameren Illinois

This article is educational and does not promise any specific savings, rate, or outcome; confirm eligibility, program rules, and contract terms with your utility and any supplier.