States › Illinois › Ameren Illinois Company
investor-owned utility · EIA utility 56697
Ameren Illinois Company
Average price is revenue divided by sales for the sector and year; it is not a tariff rate. Reliability figures are as reported by utilities to EIA on Form 861 and may use different calculation methods. Annual figures: Form EIA-861 for 2024, final release. Monthly state figures run to July 2026.
Ameren Illinois Company is an investor-owned utility that reported 1,060,894 residential customers in Illinois on Form EIA-861 for 2024, with a service territory that touches 81 counties.
Its average residential price that year was 15.26¢ per kilowatthour, 3.8% below the Illinois average of 15.87¢ and 7.4% below the US average of 16.48¢. The figure is residential revenue divided by residential sales, so it folds in fixed charges, riders and every rate schedule the utility bills under.
That works out to an average residential bill of $130.20 a month on average use of 853 kWh a month. Across Illinois the average bill was $109.99 on 693 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.
The price covers the 520,498 residential customers on bundled service. A further 540,396 take delivery only and buy their energy from another supplier; EIA collects just part of their bill from this respondent, so they are left out of the average.
For reliability it reported a SAIDI of 223.9 minutes per customer with major event days included and 120.6 minutes with them excluded, calculated under IEEE 1366 standard. The median among Illinois utilities reporting was 131.9 minutes with major event days; this utility's figure is 70% above that median.
The average price is up 62.0% on 2019, against up 21.8% for Illinois as a whole, and down 10.4% on 2023.
Compared with Illinois, the US and other investor-owned utilities
| Measure, 2024 | This utility | Investor-owned utilities, US median | Illinois | United States |
|---|---|---|---|---|
| Average residential price per kWh | 15.26¢ | 16.17¢ | 15.87¢ | 16.48¢ |
| Average monthly residential bill | $130.20 | $131.47 | $109.99 | $142.26 |
| Average monthly use, kWh | 853 | 787 | 693 | 863 |
| Residential price change, 1 year | -10.4% | — | +1.0% | +3.0% |
| Residential price change, 5 years | +62.0% | — | +21.8% | +26.7% |
| SAIDI, all events (minutes) | 223.9 | 278.7 | 131.9 median | 184.5 median |
| SAIDI, without major event days | 120.6 | 106.5 | 85.0 median | 99.8 median |
State and US prices, bills and use are EIA's own averages over every customer. The ownership column and the reliability columns are medians across utilities with at least 1,000 residential customers, computed on this site from the final 2024 file. Among the 4 filings by investor-owned utilities in Illinois, the median price was 15.24¢. In Illinois this utility's price ranks 12 of 24, counting from the highest.
Average price by year
Ameren Illinois CompanyIllinois averageUS average
Year by year
| Year | ¢ per kWh | Illinois ¢ | Monthly bill | kWh a month | Residential customers | All sales |
|---|---|---|---|---|---|---|
| 2024 | 15.26¢ | 15.87¢ | $130.20 | 853 | 1,060,894 | 33.6 TWh |
| 2023 | 17.04¢ | 15.71¢ | $139.98 | 821 | 1,060,030 | 33.2 TWh |
| 2022 | 15.37¢ | 15.65¢ | $145.91 | 949 | 1,061,975 | 34.8 TWh |
| 2021 | 11.17¢ | 13.18¢ | $102.86 | 921 | 1,063,026 | 34.8 TWh |
| 2020 | 9.74¢ | 13.04¢ | $88.23 | 906 | 1,060,266 | 33.8 TWh |
| 2019 | 9.42¢ | 13.03¢ | $87.89 | 933 | 1,059,134 | 36.1 TWh |
| 2018 | 9.79¢ | 12.77¢ | $93.81 | 959 | 1,058,471 | 37.1 TWh |
| 2017 | 10.40¢ | 12.95¢ | $90.85 | 873 | 1,059,300 | 35.2 TWh |
| 2016 | 10.40¢ | 12.54¢ | $93.86 | 903 | 1,062,515 | 36.4 TWh |
| 2015 | 10.32¢ | 12.50¢ | $92.26 | 894 | 1,060,473 | 36.1 TWh |
| 2014 | 10.05¢ | 11.91¢ | $93.42 | 930 | 1,062,627 | 36.9 TWh |
| 2013 | 9.14¢ | 10.63¢ | $81.57 | 893 | 1,061,909 | 37 TWh |
Bundled residential service only in the price, bill and use columns. Bill = residential revenue ÷ customers ÷ 12; use = residential sales ÷ customers ÷ 12.
Month by month
Ameren Illinois CompanyIllinois average
Sales by sector, 2024
| Sector | Customers | Sales | Share of sales | Revenue | ¢ per kWh, bundled |
|---|---|---|---|---|---|
| Residential | 1,060,894 | 10.7 TWh | 32% | $1,259,712,400 | 15.26¢ |
| Commercial | 162,240 | 11.9 TWh | 35% | $716,833,400 | 13.04¢ |
| Industrial | 973 | 10.9 TWh | 33% | $178,147,900 | 4.75¢ |
| Transportation | 1 | 15.5 GWh | 0% | $1,371,800 | — |
Customers, sales and revenue count every service type the utility reported (bundled, energy-only and delivery-only). The price column uses bundled service alone, because part-bill revenue would understate it. Sources of energy: 8.9 TWh in total, of which 0% was its own net generation and 8.9 TWh was bought wholesale; summer peak demand 8,350 MW.
Reliability
Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 1.13 interruptions per customer with major event days, 0.91 without; CAIDI 198.1 minutes per interruption. EIA's Illinois total across all reporting utilities was 156.9 minutes with major event days and 59.4 without. Major event days are storms and similar events that a utility's chosen method sets apart; methods differ, so treat comparisons as approximate. What SAIDI and SAIFI mean.
| Year | SAIDI, all events | SAIDI, no major events | SAIFI, all events | SAIFI, no major events | Method |
|---|---|---|---|---|---|
| 2024 | 223.9 | 120.6 | 1.13 | 0.91 | IEEE 1366 |
| 2023 | 592.1 | 113.9 | 1.33 | 0.82 | IEEE 1366 |
| 2022 | 162.3 | 114.9 | 1.02 | 0.88 | IEEE 1366 |
| 2021 | 193.9 | 117.8 | 1.11 | 0.88 | IEEE 1366 |
| 2020 | 223.6 | 101.3 | 1.04 | 0.82 | IEEE 1366 |
| 2019 | 178.6 | 132.3 | 1.16 | 1.00 | IEEE 1366 |
| 2018 | 207.8 | 110.9 | 1.07 | 0.90 | IEEE 1366 |
| 2017 | 192.0 | 118.0 | 1.12 | 0.90 | IEEE 1366 |
| 2016 | 239.0 | 124.0 | 1.36 | 1.04 | IEEE 1366 |
| 2015 | 352.0 | 130.0 | 1.39 | 1.04 | IEEE 1366 |
| 2014 | 175.0 | 139.0 | 1.31 | 1.15 | IEEE 1366 |
| 2013 | 285.0 | 136.0 | 1.38 | 1.08 | IEEE 1366 |
Counties in its service territory
- Adams County
- Alexander County
- Bond County
- Brown County
- Bureau County
- Calhoun County
- Cass County
- Champaign County
- Christian County
- Clark County
- Clay County
- Clinton County
- Coles County
- Crawford County
- Cumberland County
- De Witt County
- Douglas County
- Edgar County
- Edwards County
- Effingham County
- Fayette County
- Ford County
- Franklin County
- Fulton County
- Gallatin County
- Greene County
- Hancock County
- Henderson County
- Henry County
- Iroquois County
- Jackson County
- Jasper County
- Jefferson County
- Jersey County
- Johnson County
- Kendall County
- Knox County
- LaSalle County
- Lawrence County
- Livingston County
- Logan County
- Macon County
- Macoupin County
- Madison County
- Marion County
- Marshall County
- Mason County
- Massac County
- McDonough County
- McLean County
- Menard County
- Mercer County
- Monroe County
- Montgomery County
- Morgan County
- Moultrie County
- Peoria County
- Perry County
- Piatt County
- Pike County
- Pulaski County
- Putnam County
- Randolph County
- Richland County
- Saline County
- Sangamon County
- Schuyler County
- Scott County
- Shelby County
- St. Clair County
- Stark County
- Tazewell County
- Union County
- Vermilion County
- Wabash County
- Warren County
- Washington County
- Wayne County
- White County
- Williamson County
- Woodford County
Counties the utility listed on Form EIA-861 for 2024. Listing a county does not mean the utility serves all of it.
Other utilities in Illinois
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| Commonwealth Edison Co | Investor-owned | 3,727,675 | 15.22¢ | $88.72 | 131.9 | 35.6 |
| Mt Carmel Public Utility Co | Investor-owned | 4,327 | 19.13¢ | $168.03 | 110.6 | 86.8 |
| MC Squared Energy Services, LLC energy only | Retail power marketer | 244,008 | — | — | — | — |
| Homefield Energy energy only | Retail power marketer | 163,064 | — | — | — | — |
| Just Energy Solutions Inc. energy only | Retail power marketer | 97,550 | — | — | — | — |
| Energy Services Providers, Inc energy only | Retail power marketer | 84,834 | — | — | — | — |
| Residents Energy, LLC energy only | Retail power marketer | 77,167 | — | — | — | — |
| City of Springfield | Municipal | 59,621 | 11.95¢ | $99.19 | 83.2 | 83.2 |
All Illinois utilities · Investor-owned utilities nationwide
Questions and answers
How much does electricity cost from Ameren Illinois Company?
Residential customers paid an average of 15.26¢ per kilowatthour in 2024. EIA derives this by dividing residential revenue by residential sales; it is an average across all rate schedules and charges, not a tariff rate.
How does that compare with Illinois?
The Illinois average residential price in 2024 was 15.87¢ and the US average 16.48¢; Ameren Illinois Company was 3.8% below the state figure. Among 24 utility filings with a bundled residential price in Illinois, it had the 12th highest.
What is the average Ameren Illinois Company bill?
$130.20 a month in 2024, on average residential use of 853 kWh a month (annual revenue and sales divided by customers and by twelve). The Illinois average was $109.99 on 693 kWh.
How reliable is Ameren Illinois Company service?
It reported 223.9 minutes of interruption per customer (SAIDI) including major event days and 120.6 minutes excluding them, with 1.13 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.
Is the Ameren Illinois Company price rising?
The average residential price was down 10.4% in 2024 compared with 2023 and up 62.0% compared with 2019.
Which counties does Ameren Illinois Company serve?
Its Form EIA-861 service territory lists 81 counties, including Adams County, IL, Alexander County, IL, Bond County, IL, Brown County, IL, Bureau County, IL and Calhoun County, IL. A county can appear in several utilities' territories.
Provenance
Source: U.S. Energy Information Administration. Annual figures are from Form EIA-861 (sales to ultimate customers, reliability, operational data and service territory files), final release for 2024, respondent "Ameren Illinois Company", utility number 56697. Monthly utility figures are from the Form EIA-861M sample. State and US averages are from the Form EIA-861M sales and revenue workbook, published through July 2026. All are US government works in the public domain. Page built 30 Sep 2026. Errors in processing are corrected at the next build; see corrections. For tariffs and rate schedules, consult the utility or the state utility commission.