The Role of Community Choice Aggregation (CCA) in Shaping Illinois Commercial Energy Options

If your Illinois business receives electricity from ComEd or Ameren, there is a good chance that someone else has already chosen your energy supplier for you. That "someone" is your local municipality, acting through a program called community choice aggregation—or as it's more commonly known in Illinois, municipal aggregation.

Since Illinois passed enabling legislation in 2009 and the first programs launched in 2012, hundreds of municipalities across the state have adopted CCA programs. From small villages in the collar counties to major suburbs and downstate cities, Illinois community choice aggregation now covers millions of electricity customers. The basic premise is straightforward: by pooling the purchasing power of every resident and business in a community, the municipality can negotiate a bulk supply rate that is theoretically lower than what individual customers would pay on their own.

For residential customers, CCA has generally been a positive development. Most homeowners are not going to spend time shopping for electricity rates, and a municipally negotiated rate often beats the utility default price. But for commercial and industrial customers, the calculus is very different—and more complicated than most business owners realize.

Commercial electricity rates in Illinois are not one-size-fits-all. Your business's load profile, consumption volume, demand characteristics, and risk tolerance all factor into the rate a supplier would offer you individually. When your business is lumped into a CCA pool alongside thousands of residential accounts, the negotiated rate reflects the aggregate—not your specific profile. In many cases, that means you are leaving money on the table.

This guide will explain exactly how CCA works in Illinois, how it impacts your commercial energy rates and supplier choices, when and how to opt out, and how to build an energy strategy that leverages—rather than is limited by—municipal aggregation.

Is Your Town Choosing Your Energy Supplier? What Illinois CCA Means for Your Business's Bottom Line

Understanding the mechanics of Illinois CCA is the first step to determining whether the program is serving your business or costing you money.

How Illinois CCA Programs Work

The Illinois Power Agency Act (20 ILCS 3855) and the Illinois Municipal Code (65 ILCS 5/11-117-1.1) authorize municipalities to aggregate the electrical load of their residents and businesses. The process typically follows these steps:

1. Referendum. The municipality places a question on the ballot asking voters to authorize the governing body to negotiate an electricity supply contract on behalf of all eligible accounts. Illinois law requires this voter approval.
2. Supplier selection. Once authorized, the municipality (usually with the help of an energy consultant) issues a request for proposals to licensed retail electricity suppliers. The winning supplier offers a fixed rate for a defined term, typically 12-36 months.
3. Opt-out enrollment. All eligible accounts in the municipality are automatically enrolled in the CCA program. Customers receive a notification letter with the rate and instructions for opting out. Those who do not opt out within the specified window (usually 21 days) are enrolled.
4. Service delivery. The selected supplier provides the commodity (electricity supply), while ComEd or Ameren continues to handle delivery, billing, and maintenance. From the customer's perspective, the only change is the supply rate line on their bill.

The Opt-Out Default: Why Most Businesses Don't Realize They're Enrolled

The opt-out structure is both the strength and the weakness of Illinois CCA. It achieves high participation rates, which gives the municipality bargaining power. But it also means that many business owners have no idea they are in a CCA program.

Here is a common scenario: A business owner in a suburban Chicago municipality receives a letter about CCA enrollment, assumes it is junk mail or a utility notice that requires no action, and files it away. Two billing cycles later, their supply is switched to the CCA supplier at the CCA rate. The business owner may not notice because the bill format looks similar—ComEd still handles billing—and the rate may even be slightly lower than the previous default supply rate.

The problem? That business owner never compared the CCA rate to what they could have negotiated independently. For a business consuming 500,000 kWh per year, even a $0.005/kWh difference represents $2,500 annually. For larger commercial facilities, the gap can be much wider.

CCA Rates vs. the Commercial Energy Market: A Critical Comparison

CCA rates are designed to serve the broadest possible customer base, which in Illinois means they are optimized for the residential profile—relatively flat consumption, modest usage volumes, and low demand charges. Commercial accounts have fundamentally different characteristics:

Factor	Residential Profile	Commercial Profile
Annual consumption	8,000-12,000 kWh	50,000-5,000,000+ kWh
Load factor	20-35%	40-70%
Peak demand	5-15 kW	50-5,000+ kW
Usage pattern	Evening and weekend peaks	Daytime weekday peaks
Supplier pricing	Simple flat rate	Block, TOU, or RTP structures

Because commercial loads are larger, more predictable, and often have higher load factors, they are inherently less risky for a supplier to serve—which translates to lower per-kWh pricing. When your commercial load is pooled with thousands of residential accounts, you lose this pricing advantage.

For deeper analysis of how Illinois energy markets price commercial versus residential supply, see our guide on navigating PJM and MISO markets for Illinois businesses.

The CCA Ripple Effect: How Municipal Aggregation Impacts Your Commercial Energy Rates & Choices

CCA programs don't just affect the supply rate on your bill. They create ripple effects across the entire commercial energy landscape in Illinois.

Impact on Competitive Supplier Availability

When a municipality enrolls hundreds of thousands of accounts in a CCA program, it removes those accounts from the competitive retail market. This can have counterintuitive effects:

• Reduced supplier outreach. Retail energy suppliers focus their marketing and sales efforts on accounts that are "available"—meaning not locked into a CCA contract. If your municipality has CCA, you may receive fewer competitive offers simply because suppliers assume you are enrolled and unavailable.
• Larger pool for opted-out accounts. On the flip side, suppliers may offer more aggressive rates to businesses that have opted out of CCA because these accounts have demonstrated sophistication and price-consciousness—qualities that correlate with creditworthiness and retention.

Impact on Contract Timing and Flexibility

CCA programs operate on fixed terms, typically aligned with the calendar year or the municipal budget cycle. This creates timing constraints that may not align with your business's energy procurement strategy:

• Lock-in periods. During the CCA contract term, your rate is fixed regardless of market conditions. If wholesale prices drop significantly, you cannot take advantage of the lower market until you opt out and negotiate your own contract.
• Renewal timing. When a CCA contract expires, the municipality renegotiates—and the new rate could be higher or lower. You may receive only 21 days' notice of the new rate before automatic enrollment kicks in.
• Stacking limitations. CCA enrollment may limit your ability to layer supply strategies such as block-and-index pricing, managed portfolio approaches, or real-time pricing—strategies that sophisticated commercial energy buyers use to optimize costs.

Impact on Green Energy Choices

Many Illinois municipalities have incorporated renewable energy into their CCA programs, often purchasing Illinois wind or solar RECs to offset some or all of the supply. This is generally positive, but it comes with nuances for commercial customers:

• You may already be paying for green energy without knowing it. If your CCA program includes a green component, a portion of your rate covers REC purchases—whether or not sustainability is a priority for your business.
• Limited customization. CCA green programs are typically all-or-nothing: the standard rate includes a fixed percentage of renewables. If your business needs a specific renewable energy certificate type (e.g., Illinois wind RECs for Scope 2 reporting), the CCA's generic green offering may not qualify.
• Potential duplication. If you are independently purchasing RECs or participating in a green power program, being enrolled in a CCA with a green component means you may be paying for renewable attributes twice.

Taking Control: A Business Owner's Guide to Opting Out of or Leveraging Illinois CCA Programs

Whether you decide to stay in or leave your municipality's CCA program, the decision should be deliberate and informed—not accidental.

When Staying in CCA Makes Sense

CCA can be the right choice for some Illinois businesses. Consider staying enrolled if:

• Your annual electricity consumption is relatively low (under $25,000 per year). The savings from individual negotiation may not justify the time and effort.
• You value simplicity. CCA requires zero management effort on your part. The municipality handles supplier selection, contract negotiation, and renewal.
• The CCA rate is genuinely competitive. Compare the CCA rate to current offers from at least three licensed Illinois retail suppliers. If the CCA rate is within $0.002/kWh, the convenience factor may outweigh the marginal savings.
• The green energy component aligns with your goals. If the CCA includes 100% renewable energy and you would have purchased RECs anyway, the bundled approach may be cost-effective.

When Opting Out Is the Smart Move

For most commercial accounts with meaningful consumption, opting out and managing your own supply procurement will deliver better results:

• You consume more than 200,000 kWh annually. At this volume, you have enough purchasing power to negotiate rates that beat both CCA and utility default pricing.
• You have specialized load characteristics. High load factors, off-peak usage patterns, or interruptible loads can all be leveraged for lower rates in individual negotiations.
• You want pricing flexibility. Fixed-rate, index-based, block-and-index, and managed portfolio strategies are all available to opted-out commercial customers but not to CCA participants.
• You need specific contract terms. CCA provides a one-size-fits-all contract. Individual procurement lets you negotiate term length, pricing structure, early termination provisions, and renewable energy specifications.

The Opt-Out Process: Step by Step

Opting out of an Illinois CCA program is straightforward and free of charge:

1. Determine your current enrollment status. Check your ComEd or Ameren bill. The "supply" line will show your current supplier. If it is not ComEd or Ameren, you are likely in a CCA or have a separate supply contract.
2. Contact the CCA supplier or your utility. You can opt out by calling ComEd (1-800-334-7661) or Ameren (1-800-755-5000), or by contacting the CCA supplier listed on your bill. Some municipalities also provide online opt-out forms.
3. Choose your next step. After opting out, you will return to utility default supply (ComEd's or Ameren's "price to compare") unless you simultaneously arrange a new supply contract with a competitive retailer.
4. Confirm the switch. The transition typically takes one to two billing cycles. Monitor your next two bills to confirm the supply rate reflects your chosen option.

Important: Under Illinois law, you can opt out of a CCA program at any time without penalty. There is no early termination fee. However, once you opt out, you may not be able to re-enroll until the next CCA contract period begins—so make sure you have an alternative plan in place.

Negotiating a Better Rate After Opting Out

Once you have opted out, follow these steps to secure competitive commercial pricing:

• Gather your data. Collect 12-24 months of electricity bills and, if available, interval data from your utility's online portal.
• Solicit multiple quotes. Contact at least 3-5 licensed Illinois retail electricity suppliers. The Illinois Commerce Commission maintains a list of authorized Alternative Retail Electric Suppliers (ARES).
• Compare total cost, not just rate. Look at the all-in price including any monthly fees, usage minimums, bandwidth charges, and early termination penalties.
• Negotiate contract terms. Don't just negotiate the rate—negotiate the term length, renewal provisions, and pricing structure.

For guidance on how wholesale market dynamics affect the rates you'll see, review our resource on energy price volatility in Illinois.

Beyond Aggregation: The Future of Commercial Energy Strategy in a CCA-Dominant Illinois Market

As CCA programs continue to expand across Illinois, the commercial energy landscape is evolving in ways that create both challenges and opportunities for business owners.

The Growing CCA Footprint

Since 2012, the number of Illinois municipalities with active CCA programs has grown steadily. As of 2026, over 700 communities have passed aggregation referendums, though not all maintain active programs at any given time. The geographic concentration is heaviest in the ComEd territory (northern and northeastern Illinois), where the competitive retail market is most active.

This expansion means that an increasing share of the Illinois electricity load is contracted through municipal negotiations rather than individual procurement. For the competitive retail market, this consolidation changes the dynamics:

• Fewer individual customers are available for retail suppliers to serve, which may reduce competition and innovation in the long run.
• Larger block purchases by municipalities create opportunities for suppliers to offer volume pricing—but that pricing reflects the aggregate, not the individual commercial customer.
• Contract renewal cycles create periodic "waves" of supply procurement that can temporarily affect market pricing for all Illinois commercial customers.

Emerging Trends: CCA 2.0

Forward-thinking Illinois municipalities are evolving their CCA programs beyond simple rate negotiation:

• Tiered commercial programs. Some municipalities are beginning to offer separate CCA tracks for commercial customers, recognizing that one-size-fits-all pricing disadvantages businesses. These programs negotiate separate commercial rates based on aggregate commercial load profiles.
• Community solar integration. CCA programs are partnering with community solar developers to offer subscribers access to local solar generation, potentially providing additional bill credits beyond the supply rate savings.
• Demand response bundling. Some CCA programs are exploring demand response components that reward participating businesses for reducing consumption during peak events—a feature that overlaps with utility-offered programs from ComEd and Ameren.
• Long-term renewable procurement. Rather than short-term fixed-rate contracts, some municipalities are negotiating long-term renewable energy agreements that lock in green power pricing for 10-20 years.

Building Your Commercial Energy Strategy in a CCA World

Whether your municipality has CCA or not, the smartest Illinois businesses treat their energy procurement as a strategic function, not an administrative task:

For businesses in CCA municipalities:

• Evaluate the CCA rate annually against competitive market offers.
• Opt out if the math supports it, and use your purchasing power to negotiate better terms.
• Monitor CCA contract renewal cycles and be prepared to act quickly when new rates are announced.
• Consider whether the CCA's green energy component meets your sustainability reporting requirements.

For businesses in non-CCA municipalities:

• Take full advantage of the competitive market by soliciting multiple supplier bids.
• Consider longer-term contracts (24-36 months) when market conditions are favorable.
• Explore advanced pricing structures (block-and-index, managed portfolio) that are only available outside of CCA.
• Stay informed about potential CCA referendums in your community so you can participate in the public process.

For multi-location businesses spanning multiple municipalities:

• Develop a centralized energy procurement strategy that accounts for each location's CCA status.
• Consider aggregating your own portfolio to achieve volume pricing that exceeds what any single CCA program offers.
• Work with an energy broker or consultant who understands the Illinois CCA landscape and can navigate the complexity on your behalf.

For a broader perspective on Illinois energy market strategy, our Illinois energy market overview provides essential context.

Conclusion: Don't Let Default Decisions Define Your Energy Costs

Community choice aggregation has been a net positive for the Illinois energy market. It has brought competition to customers who would never have shopped for electricity on their own, and it has demonstrated the power of collective purchasing. For residential customers, CCA programs deliver real value with zero effort.

But for commercial customers, the default is not always the best choice. The automatic enrollment, the one-size-fits-all pricing, the limited flexibility, and the residential-weighted rate structures all work against the interests of businesses with significant energy consumption. The CCA rate that saves a homeowner $15 per month may be costing your business hundreds or thousands of dollars per month in foregone savings.

The most effective approach is not to reject CCA outright but to treat it as one option in a broader procurement strategy. Evaluate it on its merits. Compare it to competitive alternatives. Make a deliberate, data-driven decision about whether to stay enrolled or opt out. And if you opt out, use the full toolkit of the Illinois competitive retail market to secure pricing and terms that reflect your business's specific load profile and needs.

Illinois's deregulated energy market gives you the freedom to choose. Illinois commercial energy suppliers compete for your business, and the rates they offer to sophisticated, opted-out commercial customers are often significantly lower than what is available through aggregation. But that freedom only has value if you exercise it.

Not sure whether your CCA program is helping or hurting your bottom line? Contact us today for a free rate comparison. We will analyze your current CCA rate against the best available competitive offers, calculate exactly how much you could save by opting out, and help you build an energy procurement strategy that maximizes value for your Illinois business.