Ameren Illinois Company Electricity Rates and Average Bill (Illinois)
Data through April 2026 (the latest month EIA has published) · Updated July 05, 2026
As of April 2026, Ameren Illinois Company's residential customers in Illinois paid an average effective rate of 19.75¢/kWh with an average monthly bill of $115.79, per EIA Form 861-M data. That rate is 0.7¢ below the Illinois average of 20.47¢/kWh; the U.S. average is 18.83¢/kWh.
Rate trend vs the Illinois average
View this chart as a table (last 12 months)
| Month | Rate (¢/kWh) | Avg bill ($/mo) | Avg usage (kWh/mo) |
|---|---|---|---|
| May 2025 | 16.99 | 106.84 | 629 |
| June 2025 | 15.98 | 154.65 | 968 |
| July 2025 | 19.22 | 227.3 | 1183 |
| August 2025 | 17.84 | 185.55 | 1040 |
| September 2025 | 20.52 | 165.2 | 805 |
| October 2025 | 20.51 | 144.83 | 706 |
| November 2025 | 17.25 | 121.13 | 702 |
| December 2025 | 12.28 | 145.32 | 1184 |
| January 2026 | 11.06 | 125.23 | 1133 |
| February 2026 | 18.13 | 152.26 | 840 |
| March 2026 | 18.61 | 131.0 | 704 |
| April 2026 | 19.75 | 115.79 | 586 |
Ameren Illinois Company vs Illinois vs the U.S.
| Ameren Illinois Company | Illinois | U.S. average | |
|---|---|---|---|
| Rate (April 2026) | 19.75¢/kWh | 20.47¢/kWh | 18.83¢/kWh |
| Average monthly bill | $115.79 | $110.07 | $127.71 |
| Average monthly usage | 586 kWh | 538 kWh | 678 kWh |
| Rate change, 1 year | +4.8% | +12.0% | +7.3% |
Estimate a bill at Ameren Illinois Company rates
Worked example: 1,000 kWh at Ameren Illinois Company's average effective rate of 19.75¢/kWh is about $197.50. The utility's actual average usage is 586 kWh/month, which produces the $115.79 average bill. This is an all-in average (energy, delivery, fixed charges, riders); your tariff's marginal price will differ.
See the full Illinois rate trend, look up another utility by ZIP code, or read why electric bills are rising.
Source: EIA Form 861-M (monthly utility-level sales to ultimate customers, residential), published with roughly a two-month lag. Rate = revenue ÷ sales; bill = revenue ÷ customers. Months failing basic sanity screens are excluded. See methodology.