Community Choice Aggregation (CCA) and Illinois Commercial Energy

"Community choice aggregation" is a term borrowed from other states. In Illinois the closest equivalent is municipal (or governmental) aggregation: a unit of local government negotiates an electricity supply price on behalf of eligible customers within its borders and enrolls them, typically on an opt-out basis. It is a real and useful mechanism, but it is built primarily for residents and small accounts. For most commercial and industrial buyers, it is a source of confusion more than a procurement strategy. This guide explains how it works, why it exists, and where it does and does not fit a business.

What municipal aggregation actually is

Illinois restructured its electricity market so that eligible customers can either take default supply from their utility or buy the electricity commodity from a licensed Alternative Retail Electric Supplier (ARES). Municipal aggregation is a group version of that choice. After voters or a governing body authorize it, the local government runs a solicitation, selects a supplier, and enrolls eligible accounts in the community under one negotiated supply price. Eligible customers receive notice and can opt out.

Crucially, aggregation only changes the supply portion of your bill. The delivery utility, ComEd in northern Illinois or Ameren Illinois in central and southern Illinois, continues to own the poles and wires, read your meter, bill delivery charges, and restore service after outages. That separation between supply and delivery is the foundation of how Illinois commercial electricity choice works, and it applies to aggregation the same way it applies to a direct contract.

Why it is designed for residents and small accounts

Aggregation gets its leverage from combining many similar, small, hard-to-shop accounts into one negotiated purchase. Residential and very small commercial customers have relatively uniform usage patterns, which lets a supplier price a single community-wide rate. That uniformity is exactly what larger commercial and industrial accounts lack.

A manufacturer, a cold-storage warehouse, and an office tower in the same town have very different load shapes, demand profiles, and capacity obligations. Pricing them under one blanket rate would either overcharge the flat, predictable users or undercharge the peaky ones. For that reason, Illinois aggregation programs commonly exclude larger commercial rate classes or make participation optional, and many businesses find the community rate is not tailored to how they actually consume power.

Why most commercial accounts contract directly instead

Commercial buyers generally get better-fitting outcomes by negotiating supply directly, because a direct process can account for the things a community-wide rate cannot:

• Load shape and rate class. A direct quote is built from your interval data and rate class, not a town-wide average. See what a commercial energy quote requires.
• Contract structure. Direct contracts let you choose fixed, index, or blended structures, set the term, and negotiate pass-through and swing language. A community rate is take-it-or-leave-it.
• Timing. You control when you go to market and can align a solicitation with your renewal window rather than the municipality's calendar. Our procurement overview covers this.
• Terms review. A direct contract can be read and negotiated clause by clause. Our contract review guidance explains what to check.

There is also a baseline every business should know before shopping at all: the utility's default supply price, often called the price to compare. Sometimes staying on utility default is the right answer and no aggregation or direct offer beats it. That is a decision you can only make by comparing against a known benchmark.

Clearing up the common confusions

Two mix-ups come up constantly.

Aggregation is not community solar. Community solar is a subscription to a share of an off-site solar project that produces bill credits on your utility account; it is administered through Illinois Power Agency programs and is a completely separate thing from a group supply purchase. If you are evaluating a subscription, read our guide on how to vet a community solar contract.

Aggregation is not a guaranteed discount. A community rate competes against the utility default, and default pricing changes over time. Whether aggregation beats default in any given period depends on market conditions when the community's contract was priced. Retail choice, in any form, does not automatically save money.

How to think about it for your business

If your accounts are small enough that a municipality has enrolled them, read the opt-out notice, note the deadline, and compare the community rate against both the utility price to compare and a direct quote before deciding. If your accounts are larger, assume aggregation is not your primary tool and run a direct process instead. In multi-site portfolios, you may find some small locations swept into local aggregation while your anchor sites are contracted directly, which is fine as long as you are tracking each account's supply arrangement deliberately rather than by accident.

The core point: municipal aggregation is a legitimate consumer mechanism aimed at households and small accounts. Understanding what it is keeps you from either assuming it covers your commercial load or dismissing a direct process that would serve you better. Confirm eligibility and current rules with your municipality, your utility, and the ICC.

Sources

• Illinois Commerce Commission
• ComEd
• Ameren Illinois
• Illinois Power Agency

This guide is educational and does not promise savings; confirm eligibility, current pricing, and program terms with your utility, your municipality, and the ICC before acting.