Ameren Illinois electric rates and bills
Ameren Illinois's 587,659 default-service customers in Illinois paid an average of 16.70¢ per kWh in 2025, for an average bill of $148.32 a month on 888 kWh.1 Over the last 12 months (Sep 2025–Aug 2026) the average was 17.44¢, and 19.42¢ in August 2026.2 Another 475,151 homes on its wires (44.7%) buy their supply elsewhere and pay Ameren Illinois delivery charges averaging 8.77¢ per kWh, plus their supplier's price.
EIA-861 2025 final (released October 7, 2026) and EIA's monthly utility survey through August 2026 (preliminary); next monthly update expected November 24, 2026. Averages are revenue divided by kWh, all charges included: not the rate printed in a tariff.
81 of 102 Illinois counties served (EIA-861 2025)
Ameren Illinois customers paid less per kWh than ComEd's in 2025 but ran larger bills: its full-service homes averaged 16.70¢ per kWh on 888 kWh a month, for a bill of $148.32. Buying supply elsewhere is also far more common than in ComEd's area: 44.7%1 of Ameren's residential customers used a supplier or a municipal aggregation program.
Ameren Illinois's price per kWh, three ways
Ameren Illinois, legally Ameren Illinois Company and a subsidiary of Ameren, delivers electricity to 1,062,810 homes across central and southern Illinois, 20.2% of the state's residential customers. In 2025, 587,6591 of them also bought their supply from Ameren. Those full-service customers paid these averages:
| Period | Source | Average price |
|---|---|---|
| 2025, full year | EIA-861 (final) | 16.70¢ per kWh1 |
| 12 months, September 2025 to August 2026 | EIA-861M (2026 preliminary) | 17.44¢ per kWh |
| August 20263 | EIA-861M (preliminary) | 19.42¢ per kWh2 |
None of the three is a tariff rate. Each is average revenue per kWh: it divides Ameren's residential revenue from these homes (customer charge, delivery, supply and riders together, most taxes excluded) by the kWh they consumed, so a low-use apartment pays more per kWh than the average and a large house less. The single month is seasonal and preliminary, so the 12-month figure is the better reading of what full service costs now.
The 2025 average was 5.5% below the Illinois average and the 4th highest among the 16 Illinois utilities with 10,000 or more full-service homes, a group that ran from 9.99¢ per kWh (MidAmerican Energy Co) to 20.49¢ per kWh (Jo-Carroll Energy). Among US utilities with 100,000 or more residential customers it placed 63rd highest of 177, and it sat 6.1% below the national average for investor-owned utilities1.
Why Ameren bills are higher than ComEd's
ComEd, which serves the Chicago area, had the higher average price in 2025: 17.71¢ per kWh against Ameren Illinois's 16.70¢ per kWh. The bill went the other way. An Ameren full-service home used 888 kWh a month and paid $148.32; a ComEd home used 606 kWh and paid $107.321. The Illinois average bill across all utilities was $126.594.
Use per home, not price, separates the two. Ameren Illinois's figure is closer to those of large utilities in neighbouring states, where average prices were lower, than to ComEd's: Ameren Missouri, its sister company across the Mississippi, averaged 1,032 kWh a month at 13.26¢ per kWh, Duke Energy Indiana 992 kWh at 14.98¢ per kWh, and AES Indiana 941 kWh at 14.69¢ per kWh1.
Source: EIA-861 annual electric power industry report, 2025 final. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.
Show the numbers
| Utility | average monthly residential use |
|---|---|
| ComEd (IL) | 606 |
| MidAmerican Energy (IA) | 828 |
| Ameren Illinois (IL) | 888 |
| AES Indiana (IN) | 941 |
| Duke Energy Indiana (IN) | 992 |
| Ameren Missouri (MO) | 1,032 |
The result is a bill close to Duke Energy Indiana's ($148.57) and above Ameren Missouri's ($136.921), all in 2025.
July bills, April bills
EIA's monthly survey shows how much the season moves an Ameren Illinois bill. Over the 12 months from September 2025 to August 2026, full-service use per home was lowest in April 2026, at 586 kWh and an average bill of $115.79, and highest in July 2026, at 1,193 kWh and $232.34. Summer, not winter, sets the peak here, unlike at Ameren Missouri, whose peak month in the same period was January 20262.
Source: EIA-861M monthly sales and revenue by utility. kWh per residential customer in each month (EIA-861M; months since January 2026 preliminary). The table adds the average bill and price for the month.
Show the numbers
| Month | kWh per customer | Bill per customer | ¢/kWh |
|---|---|---|---|
| September 2025 | 805 | $165.20 | 20.52¢ |
| October 2025 | 706 | $144.83 | 20.51¢ |
| November 2025 | 702 | $120.02 | 17.09¢ |
| December 2025 | 1,184 | $145.32 | 12.28¢ |
| January 2026 | 1,133 | $125.23 | 11.06¢ |
| February 2026 | 840 | $152.26 | 18.13¢ |
| March 2026 | 704 | $131.00 | 18.61¢ |
| April 2026 | 586 | $115.79 | 19.75¢ |
| May 2026 | 683 | $126.26 | 18.49¢ |
| June 2026 | 923 | $169.52 | 18.36¢ |
| July 2026 | 1,193 | $232.34 | 19.47¢ |
| August 2026 | 1,054 | $204.63 | 19.42¢ |
Across the 12 months the average was 878 kWh and $153.062 a month, above the 2025 bill of $148.321 on slightly less use, as the higher prices of recent months show through.
How much rates rose in 2025 and 2026
From 2024 to 2025 the full-service average rose from 15.26¢ per kWh to 16.70¢ per kWh, an increase of 9.4%. The average bill rose faster, from $130.20 to $148.32 (+13.9%), because use per home also grew, from 853 kWh5 to 888 kWh a month. ComEd's full-service average rose more over the same years, +16.4%1.
The delivery-only average, what Ameren billed homes that buy supply elsewhere, moved less: from 8.29¢ per kWh5 to 8.77¢ per kWh (+5.8%1).
Source: EIA-861M monthly sales and revenue by utility; EIA, Electric Power Monthly / EIA-861M sales and revenue by state. Residential revenue divided by kWh in each month, as reported to EIA's monthly survey (EIA-861M; months since January 2026 preliminary). Bundled (default-service) customers only.
Show the numbers
| Month | Ameren Illinois (¢/kWh) | kWh per customer | Bill per customer |
|---|---|---|---|
| January 2025 | 12.93¢ | 1,105 | $142.87 |
| February 2025 | 14.50¢ | 992 | $143.88 |
| March 2025 | 17.19¢ | 733 | $125.99 |
| April 2025 | 18.85¢ | 596 | $112.29 |
| May 2025 | 16.99¢ | 629 | $106.84 |
| June 2025 | 15.98¢ | 968 | $154.65 |
| July 2025 | 19.22¢ | 1,183 | $227.30 |
| August 2025 | 17.84¢ | 1,040 | $185.55 |
| September 2025 | 20.52¢ | 805 | $165.20 |
| October 2025 | 20.51¢ | 706 | $144.83 |
| November 2025 | 17.09¢ | 702 | $120.02 |
| December 2025 | 12.28¢ | 1,184 | $145.32 |
| January 2026 | 11.06¢ | 1,133 | $125.23 |
| February 2026 | 18.13¢ | 840 | $152.26 |
| March 2026 | 18.61¢ | 704 | $131.00 |
| April 2026 | 19.75¢ | 586 | $115.79 |
| May 2026 | 18.49¢ | 683 | $126.26 |
| June 2026 | 18.36¢ | 923 | $169.52 |
| July 2026 | 19.47¢ | 1,193 | $232.34 |
| August 2026 | 19.42¢ | 1,054 | $204.63 |
The increase continued into 2026. The 12-month average to August 2026 was 17.44¢ per kWh, and the August 20263 average, 19.42¢ per kWh, was +8.9% on August 2025. That single month was slightly above ComEd's 19.28¢ per kWh, although Ameren remained lower over the full 12 months (19.33¢ per kWh2 at ComEd). All 2026 months are preliminary.
The Price to Compare shows the same direction. The Illinois Commerce Commission publishes it monthly for residential customers: the supply and transmission charges of Ameren Illinois's default service, on Plug In Illinois. For November 2026 it was 10.441¢ per kWh, against 8.402¢ per kWh a year earlier; its highest value since January 2017 was 12.236¢ per kWh6, in October 2022.
Source: Illinois Commerce Commission, Plug In Illinois, historical Prices to Compare. The residential default-service price for supply and transmission (electric supply charge plus transmission services charge), as published by the Illinois Commerce Commission on Plug In Illinois. It excludes distribution charges and the purchased electricity adjustment, which changes monthly.
Show the numbers
| Month | Price to Compare (¢/kWh) |
|---|---|
| January 2017 | 6.519¢ |
| February 2017 | 6.519¢ |
| March 2017 | 6.519¢ |
| April 2017 | 6.519¢ |
| May 2017 | 6.519¢ |
| June 2017 | 5.369¢ |
| July 2017 | 5.369¢ |
| August 2017 | 5.369¢ |
| September 2017 | 5.369¢ |
| October 2017 | 6.167¢ |
| November 2017 | 6.167¢ |
| December 2017 | 6.167¢ |
| January 2018 | 6.162¢ |
| February 2018 | 6.162¢ |
| March 2018 | 6.162¢ |
| April 2018 | 6.162¢ |
| May 2018 | 6.162¢ |
| June 2018 | 4.658¢ |
| July 2018 | 4.658¢ |
| August 2018 | 4.658¢ |
| September 2018 | 4.658¢ |
| October 2018 | 5.038¢ |
| November 2018 | 5.038¢ |
| December 2018 | 5.038¢ |
| January 2019 | 5.026¢ |
| February 2019 | 5.026¢ |
| March 2019 | 5.026¢ |
| April 2019 | 5.026¢ |
| May 2019 | 5.026¢ |
| June 2019 | 4.561¢ |
| July 2019 | 4.561¢ |
| August 2019 | 4.561¢ |
| September 2019 | 4.561¢ |
| October 2019 | 4.715¢ |
| November 2019 | 4.715¢ |
| December 2019 | 4.715¢ |
| January 2020 | 4.707¢ |
| February 2020 | 4.707¢ |
| March 2020 | 4.707¢ |
| April 2020 | 4.707¢ |
| May 2020 | 4.707¢ |
| June 2020 | 4.396¢ |
| July 2020 | 4.396¢ |
| August 2020 | 4.396¢ |
| September 2020 | 4.396¢ |
| October 2020 | 4.542¢ |
| November 2020 | 4.542¢ |
| December 2020 | 4.542¢ |
| January 2021 | 4.553¢ |
| February 2021 | 4.553¢ |
| March 2021 | 4.553¢ |
| April 2021 | 4.553¢ |
| May 2021 | 4.553¢ |
| June 2021 | 4.821¢ |
| July 2021 | 4.821¢ |
| August 2021 | 4.821¢ |
| September 2021 | 4.821¢ |
| October 2021 | 5.407¢ |
| November 2021 | 5.407¢ |
| December 2021 | 5.407¢ |
| January 2022 | 5.478¢ |
| February 2022 | 5.478¢ |
| March 2022 | 5.478¢ |
| April 2022 | 5.478¢ |
| May 2022 | 5.478¢ |
| June 2022 | 10.623¢ |
| July 2022 | 10.628¢ |
| August 2022 | 10.628¢ |
| September 2022 | 10.628¢ |
| October 2022 | 12.236¢ |
| November 2022 | 12.236¢ |
| December 2022 | 12.236¢ |
| January 2023 | 11.833¢ |
| February 2023 | 11.833¢ |
| March 2023 | 11.833¢ |
| April 2023 | 11.833¢ |
| May 2023 | 11.833¢ |
| June 2023 | 7.877¢ |
| July 2023 | 7.877¢ |
| August 2023 | 7.877¢ |
| September 2023 | 7.877¢ |
| October 2023 | 8.107¢ |
| November 2023 | 8.107¢ |
| December 2023 | 8.107¢ |
| January 2024 | 8.683¢ |
| February 2024 | 8.683¢ |
| March 2024 | 8.683¢ |
| April 2024 | 8.683¢ |
| May 2024 | 8.683¢ |
| June 2024 | 8.136¢ |
| July 2024 | 8.136¢ |
| August 2024 | 8.136¢ |
| September 2024 | 8.136¢ |
| October 2024 | 8.090¢ |
| November 2024 | 8.090¢ |
| December 2024 | 8.090¢ |
| January 2025 | 8.277¢ |
| February 2025 | 8.277¢ |
| March 2025 | 8.277¢ |
| April 2025 | 8.277¢ |
| May 2025 | 8.277¢ |
| June 2025 | 12.180¢ |
| July 2025 | 12.180¢ |
| August 2025 | 12.180¢ |
| September 2025 | 12.180¢ |
| October 2025 | 8.402¢ |
| November 2025 | 8.402¢ |
| December 2025 | 8.402¢ |
| January 2026 | 8.769¢ |
| February 2026 | 8.769¢ |
| March 2026 | 8.769¢ |
| April 2026 | 8.769¢ |
| May 2026 | 8.769¢ |
| June 2026 | 11.326¢ |
| July 2026 | 11.326¢ |
| August 2026 | 11.326¢ |
| September 2026 | 11.326¢ |
| October 2026 | 10.441¢ |
| November 2026 | 10.441¢ |
The Price to Compare covers supply and transmission only and is a current price, so it is not comparable with the full-service averages above, which include delivery. Delivery rate cases and tariff changes for Ameren Illinois go to the Illinois Commerce Commission; filings can be searched by company in its e-Docket system. The rate increase guide follows a case from filing to bill.
Nearly half of Ameren homes buy supply elsewhere
Of the 1,062,810 homes on Ameren Illinois's wires in 2025, 475,151 bought their electricity from a competitive supplier or a municipal aggregation program, 44.7% of the total. In ComEd's territory the share was 19.5%1.
Those homes pay Ameren for delivery and their supplier for the power. Ameren's delivery-only average was 8.77¢ per kWh in 2025, a delivery bill of $76.67 a month on 875 kWh1. What they paid for supply depends on each contract or aggregation agreement; EIA does not publish supplier prices by utility area. The delivery-only average is one part of a bill and the full-service average a whole bill, so the two are shown side by side, never added or subtracted. A supply offer lines up against the Price to Compare, the measure the Illinois retail choice guide explains.
Outage minutes nearly double the Illinois average
Ameren Illinois customers averaged 287 minutes without power in 2025 counting major events, more than the Illinois average of 144 minutes, and had 1.19 interruptions on average against 0.87 statewide. Leaving major event days out, Ameren's figure falls to 130 minutes, still above the 62 minutes Illinois average, so the gap is not only a matter of large storms. ComEd's customers, by comparison, averaged 77 minutes7 with major events included. EIA collects these measures under IEEE 1366.
Source: EIA-861 2025, reliability. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.
Show the numbers
| Utility | outage minutes per customer (all events) |
|---|---|
| ComEd (IL) | 77 |
| MidAmerican Energy (IA) | 205 |
| Duke Energy Indiana (IN) | 267 |
| Ameren Illinois (IL) | 287 |
| AES Indiana (IN) | 295 |
| Ameren Missouri (MO) | 594 |
Among the neighbouring utilities in the chart, Ameren Missouri recorded more, 594 minutes, and AES Indiana a similar 295 minutes7.
Rooftop solar and hourly pricing
Rooftop solar is more common in Ameren Illinois's territory than in ComEd's: 39,801 net-metered residential installations with 437.8 megawatts in 2025, or 37.4 per 1,000 residential customers, against 19.5 at ComEd and 8.28 at Ameren Missouri.
Practically every home has a smart meter (99.9% of residential meters were advanced meters in 2025), which hourly billing requires. Ameren Illinois listed real-time pricing and critical peak rebates as its residential time-varying offers in its EIA filing; 168,050 homes, 15.8%8 of residential customers on the system, took part. The time-of-use guide explains how hourly prices and peak rebates change a bill.
Central and southern Illinois: who else serves
Ameren Illinois reported customers in 819 counties to EIA for 2025, from Adams County on the Mississippi to Champaign and Clark counties in the east and Alexander County at the southern tip. Not one of them is Ameren's alone; every county on the list also has customers of another utility, a city-owned system or an electric cooperative. Illinois's 141 electric cooperatives and its municipal systems set their own prices, so a county or ZIP code does not settle what a home pays: Ameren Illinois's own service map decides by address. EIA publishes no city-level price.
Source: EIA-861 2025, service territory; Census Bureau, Cartographic boundary file, counties. EIA-861 2025 service territory: 81 counties. Counts whole counties even where the utility serves only part of one; check the utility's own service-area map for an address.
Business customers and help with bills
Businesses that took full service from Ameren Illinois in 2025 paid less per kWh than homes: 14.60¢ per kWh for commercial customers and 7.63¢ per kWh for the 323 industrial accounts on Ameren supply. The all-customer average was 15.51¢ per kWh. More commercial customers bought supply elsewhere (90,423) than took full service from Ameren (75,726); their delivery-only average was 4.74¢ per kWh1.
Illinois received $199.8 million11 in federal LIHEAP funds for fiscal 2026 to help low-income households with energy bills. The Ameren page compares Ameren Illinois with Ameren Missouri, and the Illinois page puts Ameren Illinois and ComEd in the state picture.
Ameren Illinois rate questions
What are Ameren Illinois rates per kWh?
Full-service residential customers paid an average of 16.70¢ per kWh1 in 2025 and 17.44¢ per kWh2 over the last 12 months (September 2025 to August 2026, 2026 months preliminary). These are averages of everything billed, customer charge, delivery, supply and riders, divided by kWh. They are not a tariff line, and they measure something different from the Price to Compare, which covers only supply and transmission.
What is the average Ameren Illinois electric bill?
$148.32 a month in 2025 for full-service homes using 888 kWh1, up from $130.205 in 2024. Over the 12 months to August 2026 it was $153.062.
How much are Ameren Illinois summer bills?
In EIA's monthly data the highest month of the last 12 was July 2026, when the average full-service home used 1,193 kWh and was billed $232.34. In August 20263 the average price was 19.42¢ per kWh2 (preliminary). EIA does not publish the summer and winter tariff rates themselves; those are in Ameren Illinois's tariff filed with the Illinois Commerce Commission.
Did Ameren Illinois rates go up in 2026?
The averages did. The August 20263 residential average was +8.9% on the same month a year earlier, and the 12-month average to August 2026 (17.44¢ per kWh2) was above the 2025 figure. The Price to Compare (supply and transmission) was 10.441¢ per kWh for November 2026, against 8.402¢ per kWh6 a year earlier.
Related pages
Sources
- EIA-861 annual electric power industry report, 2025 final; table Sales_Ult_Cust_2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861M monthly sales and revenue by utility; table sales_ult_cust_2025 and _2026; released October 23, 2026. www.eia.gov
- EIA, Electric Power Monthly / EIA-861M sales and revenue by state; table sales_revenue.xlsx (EPM Table 5.6.A); January 2001 to 2026-08; months since January 2026 preliminary; released October 23, 2026. www.eia.gov
- EIA-861 2025, average monthly bill by state; table Average_Bill_2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861 annual electric power industry report, 2024 final; table Sales_Ult_Cust_2024; 2024, final (file updated December 3, 2025); released December 3, 2025. www.eia.gov
- Illinois Commerce Commission, Plug In Illinois, historical Prices to Compare; table Historical Prices to Compare workbook; through November 2026. plugin.illinois.gov
- EIA-861 2025, reliability; table Reliability_2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861 2025, advanced meters, dynamic pricing and net metering; table Advanced_Meters, Dynamic_Pricing, Net_Metering 2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861 2025, service territory; table Service_Territory_2025; 2025, final; released October 7, 2026. www.eia.gov
- Census Bureau, Cartographic boundary file, counties; table cb_2025_us_county_5m; cb_2021_us_county_5m; 2025 (2021 for Connecticut). www.census.gov
- HHS, LIHEAP funding releases to states; table FY2027 first release; FY2026 final; FY2027 first release (October 9, 2026); FY2026 total; released October 9, 2026. acf.gov
How every figure is built: methodology. Found an error? Write to [email protected]; corrections are listed on the updates page.