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Ameren Illinois Company
Ameren Illinois Company served 587,659 residential customers in Illinois in 2025 (10.8% of the state's residential customers), the 2nd largest of 77 utilities reporting there. Bundled service; ownership: investor owned; balancing authority MISO.
The meter, one average month.
Scroll to run 30 days of Ameren Illinois Company's average residential use through a five-dial register.
- Used so far
- 888 kWh
- At 16.7¢/kWh
- $148
Price ruler0 to 50¢ per kWh
Where 16.7¢ sits.
Ameren Illinois Company averaged 16.7¢ per kWh against a Illinois residential average of 17.69¢: 5.6% below the state figure. Among the 4 investor owned utilities in Illinois with bundled residential sales, it ranks 2nd from the lowest price.
2020 and 2025EIA-861
Five years, same meter.
In 2020 the average Ameren Illinois Company home used 906 kWh a month at 9.74¢ and paid $88.23. In 2025 it used 888 kWh at 16.7¢ and paid $148: the price per kWh is up 71.5%.
| Measure | 2020 | 2025 |
|---|---|---|
| Price, ¢/kWh | 9.74 | 16.7 |
| Use, kWh a month | 906 | 888 |
| Bill, US$ a month | 88.23 | 148.32 |
| Class | Customers | MWh sold | ¢/kWh |
|---|---|---|---|
| Residential | 587,659 | 6,261,586 | 16.7 |
| Commercial | 75,726 | 2,570,138 | 14.6 |
| Industrial | 323 | 643,513 | 7.63 |
| Transportation | 1 | 14,417 | 11.98 |
Who else is on the line
Homes are one class.
Homes took 66.0% of the electricity Ameren Illinois Company sold in Illinois in 2025.
Rooftop solar on its linesnet metering
39,801 roofs.
- Residential net-metered PV
- 39,801installations reported for 2025
- Capacity
- 437.8 MWresidential, net metered
- Per 1,000 homes
- 67.7installations per 1,000 residential customers
Service territoryEIA-861
81 counties.
AdamsAlexanderBondBrownBureauCalhounCassChampaignChristianClarkClayClintonColesCrawfordCumberlandDeWittDouglasEdgarEdwardsEffinghamFayetteFordFranklinFulton
Counties in Illinois where Ameren Illinois Company reported serving customers in 2025 (81 in all; up to 24 listed).
EIA-8612025Utility 56697
The filing, line by line.
| Measure | Value | Unit |
|---|---|---|
| Average price | 16.7 | ¢/kWh |
| Illinois average price | 17.69 | ¢/kWh |
| Difference from state average | -5.6 | % |
| Price change over 5 years | 71.5 | % |
| Typical monthly use | 888 | kWh |
| Typical monthly bill | 148.32 | US$ |
| Residential customers | 587,659 | accounts |
| Share of IL residential customers | 10.8 | % |
| Size rank in IL | 2 of 77 | by customers |
| Price rank, investor owned peers | 2 of 4 | 1 = lowest |
Rate plans on fileOpenEI URDB
3 active plans.
- Time-of-use
- 0more than one energy period within a month
- Seasonal only
- 3price changes by month, not by hour
- Median fixed charge
- $14.01US dollars per month
Active residential plans: not ended, started within the last 5 years, latest version of each plan name. Time-of-use means more than one energy period within a single month; plans whose price changes only by season are counted as seasonal.