Average Electric Bill in Illinois

What the average electric bill in Illinois actually is

The average residential electric bill in Illinois is $165.28 a month: an average rate of 23.85 cents per kilowatt-hour applied to average household consumption of 693 kWh. Nationally, the equivalent figures are 18.44 cents, 863 kWh, and $159.14. So Illinois sits about six dollars a month above the national bill while using roughly twenty percent less electricity.

Run the counterfactual and the picture sharpens. An Illinois household consuming the national average of 863 kWh would pay close to $206 a month at the state's rate. Illinois bills sit near the national figure only because Illinois homes use remarkably little electricity - a consequence of near-universal gas heating and a short cooling season, not of virtue.

This also means the state average describes very few real households. It blends a studio in Rogers Park with gas heat and a window unit, a Naperville colonial with central air and a finished basement, and a farmhouse near Effingham on a heat pump. It blends customers taking default utility supply, customers whose village negotiated a group supply contract on their behalf, and customers on a retail contract they signed at a kiosk three years ago and have not thought about since. Those last three groups can pay materially different amounts for identical usage.

Seasonally, an Illinois bill is usually flatter than in the South and steeper than it looks. Because most heating is gas, winter electric bills rise modestly - furnace blowers, lights, less daylight - while the gas bill does the heavy lifting. The electric peak arrives in July and August. If you want to see what your own household costs, the electricity bill calculator will apply the Illinois rate to your actual kilowatt-hours, and the natural gas bill calculator handles the other half of an Illinois winter.

Why the rate in Illinois is what it is

Three distinct forces push the all-in Illinois rate above the national average, and only one of them is about generation.

Delivery, and the arithmetic of low usage. Every residential bill in Illinois carries a fixed monthly customer charge and delivery charges that recover the cost of poles, wires, substations, meters, and the crews who maintain them. Those costs barely change with how much electricity you use, so dividing largely fixed costs by an unusually small number of kilowatt-hours raises the effective price per unit. Part of why Illinois looks expensive per kilowatt-hour is precisely that Illinois households buy so few of them.

Grid investment recovered through delivery rates. Illinois utilities have run sustained capital programs on distribution infrastructure - metering, automation, reliability work, storm hardening in a state that gets both ice and severe convective storms. Capital enters rates and stays there for the depreciable life of the asset.

Wholesale market structure. Northern Illinois sits in the PJM Interconnection; central and southern Illinois sit in MISO. Both markets run capacity mechanisms that pay generators to be available at peak, and the cost of that capacity flows into supply prices. Illinois also hosts the largest nuclear fleet of any state, which produces very large volumes of carbon-free power with high fixed costs and low fuel costs - a different exposure profile from a gas-dominated state, and one that has been the subject of considerable state policy attention.

What none of this means is that the bill is fixed. Illinois separates the price of the electricity from the price of delivering it, and the first of those is something a household here can change.

Why Illinois households use so little electricity

693 kWh a month is among the lowest household consumption figures in the country, and in a state with brutal winters that surprises people. The explanation is mostly about which fuel does the hard work.

Natural gas heats nearly everything. Illinois has one of the most thoroughly gas-heated housing stocks in the United States. In a Chicago winter the furnace runs constantly, but it burns gas; the electricity involved is a blower motor and an ignition. A household in a comparable climate with electric heat would show two to three times the winter kilowatt-hours. This single fact does most of the work in explaining the state's number.

A short cooling season. Air conditioning in Illinois is a genuine load for perhaps ten to fourteen weeks a year, and outside of heat waves it is intermittent. Compare that with the Gulf South, where compressors run from April into October.

Dense, compact housing. The Chicago metropolitan area contains a large share of the state's households, and a large share of those are apartments, two-flats, and attached buildings. Shared walls reduce heat loss and heat gain, and smaller units contain fewer appliances. Even the single-family stock in older Illinois neighborhoods tends toward modest square footage compared with newer construction in the Sun Belt.

Water heating is usually gas too. Water heating is typically the second largest energy end use in a home. Where it runs on gas, it disappears from the electric bill entirely.

The practical consequence: in Illinois the electric bill is not the whole energy bill. A household that looks only at electricity is seeing about half the picture, because winter energy costs here live on the gas statement.

Supply shopping in Illinois, and the traps in it

Illinois is a deregulated electricity state for the supply portion of the bill. Your utility - ComEd, Ameren Illinois, or another - remains the wires company no matter what: it owns the poles, reads the meter, restores your power after a storm, and sends the bill. What you can change is who generates or procures the electricity, and at what price.

Doing nothing is legitimate. The default is utility-procured supply at a regulated price, published as a price to compare. Judge any competitive offer against that number - not last year's bill, and not a neighbor's.

Illinois also has an unusual middle option: municipal aggregation. Many municipalities and counties negotiate a supply contract for their residents as a block, with residents enrolled unless they opt out. That confers bargaining power a household would not have alone, but it is not automatically cheapest in every cycle. Read the notice when it arrives.

The traps in the individual retail market are specific and repeatable.

• Teaser rates. An attractive introductory price for the first few billing cycles, after which the contract converts to a variable rate that can move sharply. Check the length of the introductory period, not the headline number.
• Rates quoted at a benchmark usage level. Offers are frequently advertised at an assumed monthly usage, commonly 1,000 kWh. A typical Illinois household at 693 kWh never reaches it, and because monthly fees spread across fewer kilowatt-hours, the effective rate you pay is higher than the one advertised.
• Minimum usage fees. A flat charge applied in any month you fall below a threshold. In one of the lowest-usage states in the country, this is a structurally bad deal aimed squarely at the households Illinois produces.
• Bill-credit plans. A credit paid only if you cross a usage threshold in a given month. If you sit near or below that threshold, you pay a high per-kWh price and never collect it.
• Automatic rollover. Fixed contracts end, and many convert silently to a month-to-month variable rate well above market.

The discipline that actually works: compare total cost at your usage, including every recurring fee and any early termination fee, against the utility's price to compare - then diarize the contract end date.

The utilities serving Illinois and how they differ

ComEd, the Commonwealth Edison subsidiary of Exelon, serves northern Illinois including Chicago and its collar counties - by far the largest customer base in the state. Its territory sits in the PJM Interconnection, so PJM's capacity and transmission arrangements shape the supply-side costs its customers see. It is a wires-only utility: it delivers electricity and procures default supply, but the generation is separate.

Ameren Illinois serves central and southern Illinois, a far larger geographic area with a much smaller and more dispersed population. Its territory sits in MISO rather than PJM. Lower customer density per mile of line means the fixed cost of the distribution network is spread across fewer meters, and rural circuits are longer, more exposed to trees and weather, and slower to restore after major storms.

MidAmerican Energy serves a comparatively small footprint in northwestern Illinois, as an extension of a system centered on Iowa.

Alongside the investor-owned utilities, Illinois has municipal electric systems and rural electric cooperatives. Municipals are owned by the city and governed by a council or local board; cooperatives are owned by their members and have no shareholder return to earn. Customers of both generally do not participate in retail supply choice at all - the program applies to the investor-owned utilities' customers. If you live in one of those towns, the shopping advice above does not apply to you.

One thing that does not change with your supplier: outage restoration, meter work, line safety, and the emergency number all stay with the wires utility. Switching supply does not put a different crew on your street.

What happens to an Illinois bill when a household electrifies

Illinois's low household consumption is a product of gas doing the heating and water heating. When a household changes that - a heat pump replacing a furnace, a heat pump water heater replacing a gas tank, an electric vehicle in the garage - the arithmetic changes more here than almost anywhere else, because the starting point is so low.

An electric vehicle driven typical annual mileage can add several hundred kilowatt-hours a month. Against a national baseline of 863 kWh that is a large increase. Against an Illinois baseline of 693 it can approach a doubling. Two consequences follow, and both are easy to miss.

First, the supply plan that was right before may be wrong afterward. Minimum usage fees and bill-credit thresholds that were traps at 693 kWh become irrelevant, or even favorable, at 1,300 kWh.

Second, time-of-use pricing becomes far more attractive. A household whose load is mostly lighting, refrigeration, and a summer air conditioner has little to shift. A household charging a car overnight has a large, perfectly shiftable block of demand, which is exactly what time-varying rates reward. The time-of-use guide covers how to evaluate the shift against your own pattern.

The general point: as heating and driving move onto the electric meter, the Illinois profile of low usage at a high per-unit price stops describing you, and the plan you should be on changes with it.

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