Ameren Illinois Company Electricity Rates and Average Bill (Illinois)
Data through June 2026 (the latest month EIA has published) · Updated September 04, 2026
As of June 2026, Ameren Illinois Company's residential customers in Illinois paid an average effective rate of 18.36¢/kWh with an average monthly bill of $169.52, per EIA Form 861-M data. That rate is 1.5¢ below the Illinois average of 19.89¢/kWh; the U.S. average is 18.34¢/kWh.
Rate trend vs the Illinois average
View this chart as a table (last 12 months)
| Month | Rate (¢/kWh) | Avg bill ($/mo) | Avg usage (kWh/mo) |
|---|---|---|---|
| July 2025 | 19.22 | 227.30 | 1183 |
| August 2025 | 17.84 | 185.55 | 1040 |
| September 2025 | 20.52 | 165.20 | 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 | 131.00 | 704 |
| April 2026 | 19.75 | 115.79 | 586 |
| May 2026 | 18.49 | 126.26 | 683 |
| June 2026 | 18.36 | 169.52 | 923 |
Ameren Illinois Company vs Illinois vs the U.S.
| Ameren Illinois Company | Illinois | U.S. average | |
|---|---|---|---|
| Rate (June 2026) | 18.36¢/kWh | 19.89¢/kWh | 18.34¢/kWh |
| Average monthly bill | $169.52 | $142.84 | $170.65 |
| Average monthly usage | 923 kWh | 718 kWh | 930 kWh |
| Rate change, 1 year | +14.9% | +8.7% | +5.0% |
Estimate a bill at Ameren Illinois Company rates
Worked example: 1,000 kWh at Ameren Illinois Company's average effective rate of 18.36¢/kWh is about $183.60. The utility's actual average usage is 923 kWh/month, which produces the $169.52 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.