Understanding Deregulated Energy Markets: A Business Owner's Plain-Language Guide

In 1997, Illinois made a decision that fundamentally changed the economics of being a commercial energy consumer. The Illinois Electricity Markets Competition Restructuring Act introduced energy deregulation, breaking up the monopoly that utilities like ComEd and Ameren had held over the entire electricity supply chain—from power plant to your meter—and giving businesses the legal right to choose their own electricity supplier. Nearly three decades later, this right remains one of the most underutilized financial advantages available to Illinois commercial businesses. The gap between what most businesses are paying for electricity supply and what they could be paying through competitive procurement is often thousands to tens of thousands of dollars per year. In a state where commercial electricity rates Illinois are rising steadily due to grid modernization costs, capacity market volatility, and renewable portfolio standards, exercising your right to shop the deregulated market isn't just an opportunity—it's a financial imperative. Yet surveys consistently show that the majority of eligible commercial customers in Illinois remain on the utility's default supply rate simply because they've never taken the time to understand how the deregulated market works and how straightforward it actually is to make a change. This guide fixes that. We explain exactly how deregulation works, what it means for your business, and how to navigate the market to achieve lasting deregulated energy savings.

The Power of Choice: Unlocking Illinois's Deregulated Energy Market

To understand deregulation, you first need to understand what was "regulated" in the first place. Before 1997, your electric utility was a vertically integrated monopoly—it owned the power plants that generated electricity, the transmission lines that moved it across the state, and the distribution system that delivered it to your building. You had no choice but to buy from them at rates set by regulators.

What Changed: The Unbundled Bill

Deregulation "unbundled" the electricity supply chain. Today, your electricity bill has two distinct components:

• The supply component (competitive): The cost of the electricity itself—the electrons generated by power plants. This is the portion you can shop. Alternative Retail Electric Suppliers (ARES) licensed by the Illinois Commerce Commission (ICC) compete to provide this supply at rates lower than the utility's default.
• The delivery component (regulated): The cost of the poles, wires, and transformers that move electricity to your meter. Your utility—ComEd or Ameren—still owns this infrastructure, still delivers your power, and still charges you a regulated delivery rate. You cannot shop this component. Your power reliability is the same regardless of which supplier you choose.

The key insight: switching suppliers changes who bills you for the electricity, not who delivers it. Your ComEd or Ameren service remains unchanged. If there's an outage, you still call ComEd or Ameren. If your transformer fails, they fix it. The only thing that changes is the supply rate you pay, and who you pay it to.

The Price to Compare: Your Baseline Benchmark

The utility's current default supply rate is called the "Price to Compare" (PTC). ComEd and Ameren are required to publish their PTC monthly, and it serves as your benchmark: any competitive ARES offer should be evaluated against it. The PTC fluctuates with wholesale market conditions—which is why it changes monthly and why the timing of your procurement decision matters significantly.

Historically, competitive ARES suppliers have offered rates below the PTC on average, though this is not guaranteed in every market condition. The value of working with an energy broker is precisely the market intelligence to identify when competitive rates are most favorable and to run a process that captures that value systematically.

From Monopoly to Marketplace: How Deregulation Actually Slashes Commercial Energy Bills

The mechanics of saving money through deregulation are straightforward once you understand the market structure. Here's how it works in practice.

How ARES Suppliers Can Offer Lower Rates

ARES companies don't own the power plants—they're traders and marketers who purchase wholesale electricity and resell it to commercial customers. Because they operate in a competitive market without the capital overhead of owning infrastructure, they can:

• Aggregate customer demand to buy wholesale electricity at volume discounts
• Hedge their price exposure using futures and derivatives, offering fixed rates to customers while managing risk in the wholesale market
• Access multiple generation resources to find the lowest-cost supply at any given time
• Offer innovative products (renewable supply, indexed pricing, block-and-index structures) that utilities don't provide under regulated tariff structures

The competitive pressure between ARES suppliers is what drives rates toward market levels. When you run a competitive bid process across multiple suppliers simultaneously, you're creating auction dynamics that consistently produce better outcomes than dealing with any single supplier. A qualified energy broker can run this process efficiently and provide the independent market context needed to evaluate results objectively.

Fixed vs. Variable: The Structural Decision

Beyond price, the competitive market offers structural flexibility that the regulated default rate doesn't. You can choose fixed rates for budget predictability, variable rates to capture market opportunities, green supply contracts for sustainability goals, or sophisticated hybrid structures that blend certainty with market exposure. The right choice depends on your financial risk tolerance and energy management sophistication. Our complete guide to fixed vs. variable commercial energy rates covers this decision in depth.

The Natural Gas Parallel

Illinois's natural gas market is also deregulated, with Alternative Retail Natural Gas Suppliers (ARNGS) competing for commercial customers through Peoples Gas and Nicor Gas. The same competitive procurement principles that apply to electricity apply equally to natural gas—benchmarking against the utility's Price to Compare, running competitive bids, and choosing contract structures appropriate to your risk profile. For businesses with significant natural gas consumption (heating-heavy facilities, food service, light manufacturing), natural gas procurement optimization is often equally or more valuable than electricity procurement. Our dedicated guide to negotiating commercial natural gas contracts covers this market in detail.

The Illinois Business Owner's Checklist for Choosing an Alternative Energy Supplier

Not all ARES suppliers are equal in quality, reliability, or financial stability. Here's what to verify before signing with any supplier.

1. Verify ICC Licensing and Good Standing

All ARES suppliers operating in Illinois must be licensed by the ICC. Verify that any supplier you're considering is currently licensed and in good standing by searching the ICC's ARES database. An unlicensed "supplier" cannot legally provide you with electricity service in Illinois. This verification takes about 60 seconds and eliminates a category of fly-by-night operators from consideration.

2. Assess Financial Stability

Your electricity supply contract is a financial commitment, and your supplier's ability to honor it depends on their financial health. Ask for the supplier's credit rating (if applicable), verify their corporate structure, and ask how long they've been operating in Illinois. Suppliers that are subsidiaries of large energy companies or utilities generally have stronger financial backing than independent operators.

3. Review Their Track Record for Billing Disputes

Ask the supplier for references from similar commercial customers in Illinois and check for any ICC complaints or enforcement actions in their regulatory history. Suppliers with a pattern of billing disputes, unauthorized switching (called "slamming"), or misleading sales practices are risks you don't need to take.

4. Understand Their Compensation Model

If you're working through a broker, understand how both the broker and the supplier are compensated. Suppliers typically pay brokers a commission, which is embedded in the rate. Transparent brokers will disclose this. Less transparent operators may steer you toward higher-margin suppliers rather than best-priced suppliers.

5. Read the Contract Carefully

Specific contract terms to review: the all-in rate (not just the supply rate), the definition of what triggers a price change on variable contracts, the termination provisions and fees, the auto-renewal clause, and any pass-through charges that might add to your cost. Our guide to commercial energy contract negotiations provides a detailed framework for contract review.

6. Compare Apples to Apples

When receiving bids from multiple suppliers, ensure you're comparing the same product structure. A fixed rate from one supplier must be compared to a fixed rate (same term, same structure) from another. A variable rate offer cannot be directly compared to a fixed rate offer without understanding both the current market and forward price expectations.

Don't Leave Money on the Table: Your Next Steps to Maximize Energy Savings

Understanding the deregulated market is the first step. Here's the action plan for capturing the savings it offers.

Step 1: Know When Your Current Contract Expires

Many commercial businesses are on auto-renewing contracts that roll over to variable month-to-month rates at expiration—often at less favorable terms. Find your current contract's expiration date and set a reminder 90 days in advance to begin your next procurement process. Procuring reactively (waiting until after the contract expires) consistently produces worse outcomes than proactive shopping.

Step 2: Gather Your Consumption Data

Suppliers price offers based on your historical consumption profile. Gather 12–24 months of monthly billing data (kWh and peak kW demand) before soliciting supplier bids. This data is available from your utility or through your online account. The more accurately suppliers can assess your load profile, the better the pricing you'll receive—because they can price precisely rather than conservatively.

Step 3: Work with an Independent Energy Advisor

The deregulated market has many participants with varying levels of integrity and expertise. An independent energy advisor or broker—one who runs competitive processes across multiple suppliers and provides transparent market analysis—consistently outperforms going direct to a single supplier. At Jaken Energy, we run competitive procurement processes for Illinois commercial businesses across both electricity and natural gas, providing market intelligence, contract analysis, and ongoing rate management to ensure you're always benefiting from the competitive market.

Step 4: Pair Procurement with Efficiency

The most powerful commercial energy strategy combines competitive procurement (reducing the price per unit) with efficiency improvements (reducing the number of units consumed). The two strategies compound: every kWh you save is saved at the lower competitive rate you've locked in, amplifying the financial impact of both programs. Start with our commercial energy audit guide to understand your efficiency potential.

Frequently Asked Questions: Deregulated Energy Markets in Illinois

Is Illinois a deregulated energy state?

Yes. Illinois has had a deregulated electricity market since 1997 and a deregulated natural gas market as well. Commercial customers in ComEd and Ameren territory can choose alternative suppliers for both electricity and natural gas supply.

What is an Alternative Retail Electric Supplier (ARES)?

An ARES is a company licensed by the Illinois Commerce Commission to supply electricity to commercial and residential customers in deregulated Illinois utility territories. ARES suppliers compete on price and product structure but do not own or operate the distribution infrastructure—your utility still delivers the power.

Does switching electricity suppliers in Illinois affect my power reliability?

No. Your power delivery reliability is entirely dependent on your utility (ComEd or Ameren), not your supplier. Your utility continues to maintain the poles, wires, and transformers regardless of which supplier you choose. If there's an outage, you contact your utility, not your supplier.

How long does it take to switch electricity suppliers in Illinois?

The switching process typically takes 1–2 billing cycles (30–60 days) after your contract is signed. There is no service interruption during the switch. The new supplier's rate appears on your next or second-next utility bill as a "supplier charge" replacing the utility's supply charge.

Can I go back to my utility's default supply rate after switching?

Yes. If your contract with an ARES expires or you terminate it (subject to any applicable termination fees), you return to the utility's default supply rate. Some businesses actively use this flexibility, returning to the utility default when they believe it offers better value than available supplier rates.

What is the Price to Compare (PTC) in Illinois?

The Price to Compare (PTC) is the per-kWh supply rate your utility charges if you don't choose a competitive supplier. ComEd and Ameren publish their PTC monthly. Any competitive supplier offer should be evaluated against the PTC for a fair assessment of its value. The PTC fluctuates with wholesale market conditions, making procurement timing an important factor in supplier selection.

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