How an Illinois commercial electric bill is built
A commercial electric bill in Ameren Illinois or ComEd territory has two halves. Delivery charges pay the utility to maintain the wires and meter; they are regulated and the same no matter who supplies your power. Supply charges pay for the electricity itself. Since Illinois opened its retail market, commercial customers can buy supply from the utility at its default rate or from an alternative retail electric supplier. Supply is usually the largest single line on the bill, which is why it gets the most sales attention.
Both halves are priced per kilowatt-hour (and, for larger accounts, per kilowatt of peak demand). That gives you exactly two levers: the price per unit, and the number of units.
Lever 1: pay less per kilowatt-hour
Supply-side programs negotiate the price of electricity without touching the building. They come in three common forms in Central Illinois:
- Municipal aggregation. Many Illinois communities and counties pool small accounts and bid them out together. Small commercial accounts (roughly under 15,000 kWh a year) are often best served here because they are too small to attract individual pricing.
- Association and Chamber of Commerce programs. Business groups run group-buying programs with an energy broker who shops your account to several suppliers and locks a fixed rate for a contract term.
- Direct broker or supplier contracts. Larger accounts can negotiate individually. Terms, pass-through clauses, and renewal dates matter as much as the headline rate.
What to expect: savings depend on market timing and your usage profile, and they apply only to the supply half of the bill. Always ask for a written comparison against the utility's current price to compare, and note when the contract ends.
Lever 2: use fewer kilowatt-hours
Usage reduction lowers both halves of the bill at once, because delivery and supply are both billed per kilowatt-hour. For most Central Illinois commercial buildings the opportunities cluster in four places: lighting (especially older fluorescent or metal-halide fixtures), HVAC scheduling and setpoints, building envelope and dock-door infiltration, and equipment that keeps running after hours. Typical results from an audit run 7 to 25 percent of total energy spend, with the largest share from measures that pay back in under three years.
Illinois utilities fund part of this work. Ameren Illinois and ComEd business efficiency programs offer rebates for LED retrofits, controls, and HVAC upgrades; several programs require pre-approval before equipment is purchased, so timing the application matters.
Which one first?
| Your situation | Start with | Why |
|---|---|---|
| Never shopped supply; paying the utility default rate | Supply program | Fast, no capital, and the savings start on the next bill |
| Already on aggregation or a competitive contract | Energy audit | Price is handled; usage is the remaining lever |
| Bills rising with no change in operations | Benchmark first | Twelve months of bills show whether it is rate, usage, or both |
| Planning equipment replacement or a capital budget | Energy audit | Sizes the savings before money is committed and lines up rebates |
The two levers multiply. A building that locks a lower rate and then cuts usage 15 percent saves 15 percent of a smaller bill, and the usage savings persist after the supply contract expires.
Does switching suppliers change my delivery charges?
No. Delivery stays with Ameren Illinois or ComEd at the regulated rate, and they continue to read the meter, send the bill, and restore power after outages. Only the supply line changes.
Can a small business in Illinois choose its supplier?
Yes. Commercial customers in Ameren Illinois and ComEd territory can choose an alternative retail electric supplier or join a municipal aggregation where their community offers one. Very small accounts often get their best price through aggregation rather than an individual contract.
How does AURA Insight fit in?
We work the usage lever. AURA Insight Energy Solutions is an independent energy audit consultancy based in Bloomington-Normal, serving commercial buildings, warehouses, offices, schools, and churches across Central Illinois. We do not sell electricity or equipment. A Benchmark Report built from twelve months of your bills tells you where your building stands against its peers and which improvements are worth pursuing; when the supply side is the bigger opportunity, the report says so.
McLean County Chamber of Commerce members receive the Benchmark Report free through the Chamber Energy Savings Program.