Utilities and rate plans
Each utility’s current residential tariffs, transcribed from its tariff sheets, with periods, tiers, fixed charge and a typical bill. Customer counts from EIA-861 (2025).
Cheapest utility for a typical Illinois home (697 kWh a month) | Utility | Cheapest plan open to all | Typical bill | All-in ¢/kWh | Fixed/mo |
|---|
| ComEd | DTOD | $142 | 20.4 | $19.99 |
| Ameren Illinois | DS-1 / BGS-1 | $147 | 21.1 | $16.57 |
Each row prices a utility’s standard plan for a typical home. The Illinois average of 18.91¢/kWh (EIA, 12 months) is what every household in the state actually paid, including utilities not modeled here and discounted low-income bills, so it can sit below every row.
Charging an electric car in Illinois
Driving a Tesla Model Y Long Range AWD 1,000 miles a month takes 275 kWh from the wall (EPA 27.5 kWh/100 mi), about $52 at the state average. A 25.5 mpg gasoline car covering the same distance at $4.17 a gallon (Midwest (PADD 2) average, October 2026) costs about $163.
On a time-of-use plan, charging in the cheapest hours beats the flat average. The table shows, for each utility, the plan with the lowest total bill for a typical Illinois home that adds 1,000 EV miles a month, averaged over the year, and what plugging in at 6 pm would cost instead.
| Utility | Best plan for an EV | Best start | 1,000 mi, best start | From 6 pm |
|---|
| ComEd | DTOD | 12 am | $41 | $59 |
| Ameren Illinois | DS-1 / BGS-1 | Any | $47 | $47 |
Other models: cost to charge by model. Your car, miles and plan: EV charging cost calculator.
Average electric bill in Illinois
Over the last 12 months the average price was 18.91¢ per kWh and the average home used 697 kWh a month, so a typical Illinois household spent about $132 a month on electricity, or $1,582 a year. Use is 20% below the US average of 875 kWh a month, peaking in July at 1,005 kWh.
The state average hides the real spread. Utilities in the same state charge different prices, and on a time-of-use plan the same kWh costs more in the peak hours than off-peak; each utility page shows by how much. Open ComEd’s page to see its plans, prices by hour and fixed charge, or run the calculators below with Illinois preloaded.
Natural gas for homes averaged $1.13 per therm over the 12 months to August 2026 (EIA, all charges included), and a typical gas-heated home uses about 773 therms a year for heating. The heat pump calculator compares that with electric heating on your plan.
A south-facing, 20° rooftop array in Illinois produces about 1,326 kWh per installed kW a year (NREL PVWatts at the state’s population center). What that is worth depends on your utility’s export rule, shown on each utility’s page.
Illinois electricity: common questions
How much does electricity cost in Illinois?
Homes in Illinois paid an average of 19.32¢ per kWh in August 2026, against 18.16¢ for the US, which ranks the state #18 of 51 from most expensive. Over the last 12 months the average was 18.91¢. These are EIA averages of what households actually paid, fixed charges included; your utility and plan set your own price.
What is the average electric bill in Illinois?
About $132 a month ($1,582 a year): the average Illinois home used 697 kWh a month over the last 12 months at an average 18.91¢/kWh. Use peaks in July, at 1,005 kWh.
Are electricity prices going up in Illinois?
Illinois's average residential price was 19.32¢/kWh in August 2026, 7.2% higher than a year earlier. Over the last ten years the 12-month average has changed by +4.2% a year, against +3.7% a year for the US.
How much does it cost to charge an electric car in Illinois?
Driving 1,000 miles a month in a Tesla Model Y Long Range AWD takes 275 kWh from the wall, about $52 at the state's average home price, against about $163 of gasoline for a 25.5 mpg car. On a time-of-use plan, charging overnight can cost less than that.
Do Illinois utilities offer time-of-use plans?
Yes. ComEd offers DTOD (peak 1 pm–7 pm on summer weekdays). Each utility's page shows every period and price.