Full service
16.70¢
per kWh, 2025 average revenue
$148.32 / month at 888 kWh
Price +9.5% from 2024
Investor Owned · 1,062,810 residential customers · Illinois
Why is my Ameren Illinois electric bill so high?
EIA respondent: Ameren Illinois Company. Reviewed October 14, 2026. Also searched as Ameren.
Ameren Illinois did not have one residential price in 2025. EIA keeps the service types separate. 587,659 full service customers averaged 16.70¢ per kWh and $148.32 a month; 475,151 delivery only customers averaged 8.77¢ per kWh and $76.67 a month. A blended average would describe neither bill. The legal name in the filing is Ameren Illinois Company.
Illinois's 2025 statewide residential average was 17.67¢. July 2026 was 19.22¢, versus 17.22¢ in July 2025 (+11.6%). Compare each Ameren Illinois service type with those figures on its own.
From 2024 to 2025, the average monthly bill for full service changed +13.9%. Average use changed +4.0% and average price changed +9.5%. Holding the 2024 price fixed, the usage change accounts for $5.27 a month. The price change, applied to 2025 usage, accounts for $12.82.
EIA Form 861, 2025 final · Reviewed October 14, 2026
EIA Electric Power Monthly, Table 5.6.A · Reviewed October 14, 2026
Delivery only
8.77¢
per kWh, 2025 average revenue
$76.67 / month at 875 kWh
Price +5.8% from 2024
The rate on the record
Investor-owned base rates are usually set in a state docket. Riders can change outside a full rate case. Average revenue per kilowatt-hour is total residential revenue divided by residential sales. It is not a tariff schedule.
| Service | Customers | Price | Monthly use | Monthly bill | Vs 2024 price |
|---|---|---|---|---|---|
| Full service | 587,659 | 16.70¢ | 888 kWh | $148.32 | +9.5% |
| Delivery only | 475,151 | 8.77¢ | 875 kWh | $76.67 | +5.8% |
EIA-861 sales to ultimate customers, 2025 final, compared with 2024 · Reviewed October 14, 2026
By state
| State | Service | Customers | Price | Monthly bill |
|---|---|---|---|---|
| IL | Full service | 587,659 | 16.70¢ | $148.32 |
| IL | Delivery only | 475,151 | 8.77¢ | $76.67 |
Audit the full service average
Revenue 1,045,940.7 thousand dollars. Sales 6,261,586 MWh. Customers 587,659. Cents per kWh = revenue ÷ megawatt-hours × 100. Monthly bill = revenue × 1,000 ÷ customers ÷ 12.
Audit the delivery only average
Revenue 437,145.4 thousand dollars. Sales 4,986,381 MWh. Customers 475,151. Cents per kWh = revenue ÷ megawatt-hours × 100. Monthly bill = revenue × 1,000 ÷ customers ÷ 12.
Why a Ameren Illinois bill moved
The price change was the larger piece
From 2024 to 2025 the average full service bill at Ameren Illinois moved +13.9%, from $130.20 to $148.32. Holding the 2024 price fixed, the usage change of +4.0% is worth $5.27 a month. The price change of +9.5%, from 15.26¢ to 16.70¢, is worth $12.82 on 2025 usage.
Below the Illinois average
16.70¢ per kWh is below Illinois's 2025 residential average of 17.67¢. July 2026 in the state was 19.22¢, versus 17.22¢ a year earlier (+11.6%). The utility figure is a full year of average revenue. The state figure is one later month. A household that uses more than 888 kWh will not land on $148.32.
Two residential prices, on purpose
Ameren Illinois reported more than one residential service with a real customer count: 587,659 full service customers at 16.70¢; 475,151 delivery only customers at 8.77¢. Bundled customers buy supply and delivery together. Delivery customers buy supply from someone else. A single blended rate would describe neither bill.
Revenue-neutral rate design, not a revenue increase
Illinois Commerce Commission, Docket 25-0083. On August 7, 2025 the Illinois Commerce Commission entered a final order in Ameren Illinois's revenue-neutral electric rate-design case under Section 16-105.5. Compliance tariffs were filed to take effect August 28, 2025. The proceeding redesigns delivery rates. It does not itself raise the revenue requirement. The… The rate-case section has the full citation.
Season
The 2025 monthly average for this Ameren Illinois service was 888 kWh, and the Illinois residential average was 717 kWh. A single month can sit far from either figure. Compare kilowatt-hours with the same month last year before you treat the whole increase as a rate hike.
Time-of-use is already on the EIA schedule
EIA's 2025 dynamic-pricing file shows residential time-of-use activity at Ameren Illinois, with 168,050 residential customers enrolled in dynamic pricing. The expensive window is in the tariff, not in that enrollment count. Shifting a dishwasher or an EV charger only helps if you are actually on that schedule.
EIA-861 2025 and 2024 residential sales · Reviewed October 14, 2026
Rate cases and hikes
decided · Docket 25-0083
Revenue-neutral rate design, not a revenue increase
On August 7, 2025 the Illinois Commerce Commission entered a final order in Ameren Illinois's revenue-neutral electric rate-design case under Section 16-105.5. Compliance tariffs were filed to take effect August 28, 2025. The proceeding redesigns delivery rates. It does not itself raise the revenue requirement. The order rejected Ameren's proposed peak-usage charge.
A separate 2025 Ameren Illinois docket, 25-0084, is a natural-gas rate case, not the electric delivery revenue requirement.
Illinois Commerce Commission final order, Docket 25-0083 (Illinois Commerce Commission) · Reviewed October 14, 2026
Assistance
One Ameren Illinois program was read from an official page. LIHEAP is still the federal backstop. Any other discount not named here needs verification.
Illinois LIHEAP and the Ameren electric discount
Illinois DCEO's application page is the LIHEAP door for Ameren Illinois. The page says Ameren's electric discount begins October 1, 2026, and it keeps that program separate from the natural-gas low-income discounts.
Illinois DCEO, how to apply for utility bill assistance · Reviewed October 14, 2026
LIHEAP program · State and territory contacts · Ameren Illinois site
LIHEAP · Reviewed October 14, 2026
How to lower the bill
- Read the kilowatt-hours against this filing's average of 888 kWh a month. If your use is the thing that moved, the dollar total can rise on an unchanged rate.
- Add the supply line and the delivery line before you decide the bill is high. This page keeps those EIA rows apart so they are not blended.
- Match this month's weather to last year's same month. A mild comparison month makes an ordinary bill look like a hike.
- Ask about Illinois LIHEAP and the Ameren electric discount before a payment arrangement. Income rules are on the linked page.
- 168,050 residential customers were already on a dynamic price in the 2025 EIA file. If you are one of them, the window on the tariff is the lever. If you are not, calling the utility to discuss the schedule is the first step, not shifting load you are not being charged extra for.
- If the read is marked estimated, the next actual read can true the account up or down. The tariff rule for that true-up needs verification.
Full service at the 2025 average price
| Monthly use | Estimated bill |
|---|---|
| 500 kWh | $83.50 |
| 750 kWh | $125.25 |
| 1,000 kWh | $167.00 |
| 1,500 kWh | $250.50 |
| 2,000 kWh | $334.00 |
Usage times the average price. At very low use, a real bill is often higher because a fixed customer charge does not shrink. The tariff needs verification.
Delivery only at the 2025 average price
| Monthly use | Estimated bill |
|---|---|
| 500 kWh | $43.85 |
| 750 kWh | $65.78 |
| 1,000 kWh | $87.70 |
| 1,500 kWh | $131.55 |
| 2,000 kWh | $175.40 |
Usage times the average price. At very low use, a real bill is often higher because a fixed customer charge does not shrink. The tariff needs verification.
Questions people ask
Why is my Ameren Illinois electric bill so high?
Ameren Illinois did not have one residential price in 2025. EIA keeps the service types separate. 587,659 full service customers averaged 16.70¢ per kWh and $148.32 a month; 475,151 delivery only customers averaged 8.77¢ per kWh and $76.67 a month. A blended average would describe neither bill. The legal name in the filing is Ameren Illinois Company. Illinois's 2025 statewide residential average was 17.67¢. July 2026 was 19.22¢, versus 17.22¢ in July 2025 (+11.6%). Compare each Ameren Illinois service type with those figures on its own. From 2024 to 2025, the average monthly bill for full service changed +13.9%. Average use changed +4.0% and average price changed +9.5%. Holding the 2024 price fixed, the usage change accounts for $5.27 a month. The price change, applied to 2025 usage, accounts for $12.82.
What was Ameren Illinois's average residential rate?
Using 2025 EIA-861 revenue and sales, the full service average was 16.70¢ per kWh. Average use was 888 kWh a month and the average bill was $148.32. This folds in whatever customer charges and riders the utility reported. It is not the marginal rate on your tariff.
Did Ameren Illinois raise rates?
Illinois Commerce Commission Docket 25-0083 (decided): Revenue-neutral rate design, not a revenue increase. Separately, the EIA average price moved +9.5% from 2024 to 2025. The annual average and the docket are not the same document.
What bill assistance can Ameren Illinois customers ask about?
Illinois LIHEAP and the Ameren electric discount. Illinois DCEO's application page is the LIHEAP door for Ameren Illinois. The page says Ameren's electric discount begins October 1, 2026, and it keeps that program separate from the natural-gas low-income discounts. LIHEAP is still available (https://www.acf.hhs.gov/ocs/programs/liheap).
Are data centers why this bill went up?
Large computing load is raising U.S. electricity demand, and regulators can later recover new generation and wires costs from customers. EIA has not published a dollar line that isolates data centers on this utility's residential bill. That pass-through needs verification.