How to Evaluate a Licensed Illinois ARES

In Illinois, eligible commercial customers can buy the supply portion of their electricity from an Alternative Retail Electric Supplier (ARES) instead of taking the utility's default supply. The delivery utility — ComEd in the north, Ameren Illinois in central and southern Illinois — still delivers the power, maintains the system, and restores service after an outage. The ARES affects only the supply portion of your bill.

Choosing a supplier is a commercial decision that locks in obligations, sometimes for years. This guide covers how to vet an ARES rigorously: confirming the license, weighing counterparty risk, testing contract transparency, and asking the questions that separate a serious buyer from one who takes the first quote.

Step One: Verify the ICC License

Every legitimate ARES operating in Illinois holds a license from the Illinois Commerce Commission (ICC). This is the non-negotiable first check.

• Confirm the company holds an active ARES license through the ICC before you engage seriously. The ICC is the state authority that certifies suppliers.
• Match the entity you are talking to against the licensed entity. Brokers and sales agents may represent a supplier without being the licensed party themselves — know which company will actually be your counterparty on the contract.
• If you cannot verify active licensure through the ICC, treat that as a stop sign until it is resolved.

This step is quick and it filters out the clearest risks. A company that will supply electricity to your business should be verifiable through the state that regulates the market.

Step Two: Weigh Counterparty and Financial Considerations

A supply contract is only as good as the company standing behind it. You do not need to be a credit analyst, but you should think about counterparty risk deliberately.

• Track record and tenure. How long has the supplier operated in Illinois? A longer, stable presence in the market is a reasonable signal, though not a guarantee.
• Scale and focus. Some suppliers focus on large industrial loads, others on small commercial accounts. A supplier that regularly serves businesses like yours is more likely to price and service you well.
• Financial standing. Larger suppliers may carry public credit ratings; smaller ones may not. Ask directly about financial stability and whether the supplier can speak to it.
• Continuity protection. Illinois has provisions so customers return to utility default supply if a supplier exits, so your lights stay on. But a supplier's exit would still move you off your negotiated price, so stability is worth weighing up front.

The point is not to demand perfection but to understand who you are contracting with and what happens in the unlikely event they stop serving you.

Step Three: Test Contract-Term Transparency

How a supplier handles the contract itself tells you a great deal. A serious counterparty will put terms in writing and answer questions plainly; an evasive one is a warning regardless of the rate.

Look for clarity on:

• Pricing scope. Is the price all-in, or does it fix energy while passing through capacity, transmission, ancillary services, or regulatory charges? Get the inclusions and exclusions in writing. See the clause-by-clause contract guide.
• Pass-throughs. Are they a defined, closed list, or open-ended "including but not limited to" language that shifts unbounded risk to you?
• Bandwidth and swing. How much can your usage move before out-of-band volume settles at market prices? This matters most for seasonal or variable loads. See bandwidth and swing clauses.
• Term, termination, and renewal. How long is the term, how is early exit calculated, and does the contract auto-renew or roll to a holdover rate? Note the renewal notice window and calendar it — our renewal timeline helps.

A supplier that resists putting these in writing before you enroll is telling you something.

Step Four: Assess Service and Billing

Day-to-day experience matters over a multi-year term.

• Billing method. Will charges be consolidated on your utility bill or billed separately by the supplier? Either can work; know which to expect.
• Dispute process. How are billing disputes raised and resolved, and is there a defined window to contest a charge?
• Support. Who is your point of contact for questions during the term, and how responsive are they before you have even signed? Pre-sale responsiveness is a preview of post-sale service.

Watch for Pressure and Vagueness

Certain behaviors should raise your guard regardless of the rate offered:

• Artificial urgency — "this price is only good today."
• Reluctance to provide a full written contract before enrollment.
• Evasiveness about what is fixed versus passed through.
• Unclear identity — you cannot tell which licensed entity you would actually be contracting with.
• Open-ended pass-through or change-in-law language.

None of these are about the number. They are about how the counterparty behaves, and behavior before signing is a reliable preview of behavior during the term.

Questions to Ask Before You Sign

1. Are you the licensed ARES, or a broker or agent — and which licensed entity is my counterparty?
2. Is the price all-in, or fixed energy with pass-throughs? Exactly which items pass through?
3. What is the bandwidth or swing tolerance, and how does out-of-band usage settle?
4. How is early termination calculated, and what notice is required?
5. Does the contract auto-renew? What is the notice window to prevent it, and what rate applies if I do nothing?
6. How is billing handled, and what is the dispute process and deadline?
7. Can you speak to your financial stability and time in the Illinois market?

Putting It Together

Vetting an ARES is a process, not a single price comparison. Confirm the ICC license, weigh who you are contracting with, insist on written and transparent terms, and understand the service and billing experience. Then compare finalists on full terms rather than the headline rate alone — our guide on comparing offers apples to apples shows how to build that comparison.

For structured buying and review support, see /commercial-energy-procurement/ and /commercial-energy-contract-review/. For product and territory context, see /commercial-electricity/, /utilities/comed/, and /utilities/ameren/.

Sources

• Illinois Commerce Commission
• Illinois Power Agency
• ComEd

This guide is educational and does not promise any specific savings or endorse any supplier. Verify a supplier's license and terms yourself using the primary sources above before making a decision.