Estimate what solar does against Ameren Illinois’s 11.3¢ rate
Enter your bill and we’ll size the array that would cover it, and show the gross value of that production at your rate. It does not net off the customer charge, taxes or what you would still draw at night — for that, use the bill savings calculator. Nothing is sent anywhere; this runs in your browser.
An estimate from your own numbers, not a quote, and not a savings figure. It assumes 400 W panels, an 80% system derate and no roof constraints. Your real number depends on orientation, roof area and your utility’s export credit. Savings are not guaranteed.
Illinois · Updated September 2026
Ameren Illinois rates in 2026
What Ameren Illinois customers are paying, where the number comes from, and what it means for your bill. Serving central and southern Illinois.
The numbers
| Measure | Current | Detail |
|---|---|---|
| Price to Compare | 11.326¢/kWh | First 800 kWh, June–Sept 2026 |
| Electric supply | 8.2¢/kWh | Up from 8.769¢ through May |
| Supply cost adjustment | 0.308¢/kWh | Fixed, set by the ICC |
| Transmission service | 2.765¢/kWh | Effective June 2026 |
| MISO capacity auction | $666.50/MW-day | Up from $30 — the main driver |
| ICC delivery increase | $308.6M | Approved December 2024 |
Source: Illinois Commerce Commission via PlugIn Illinois, effective June 1 – September 30, 2026.
How to check your own rate in thirty seconds
Take the total dollar amount on your most recent bill and divide it by the kilowatt-hours you used that month. That figure includes supply, delivery, transmission, riders and taxes, and it is the only number that matters when comparing against solar. Every published average — ours included — is a stand-in for it.
If your figure is materially different from the one above, yours is right and ours is an average. Rates vary by rate class, by season and by usage tier.
What solar does against this rate
Solar does not stop your utility raising rates. It reduces how many kilowatt-hours you buy at whatever the rate becomes, and under a power purchase agreement it fixes the price of your own production in advance. That is a reduction in exposure, not a guaranteed saving, and the size of it depends entirely on your roof, your usage and your export credit.
How net metering works in Illinois · All Illinois utility rates · Size a system for your usage
Common questions
What does Ameren Illinois charge per kWh?
About 11.3¢ per kilowatt-hour — Price to Compare — supply plus transmission, before delivery. Source: Illinois Commerce Commission via PlugIn Illinois, effective June 1 – September 30, 2026. Divide your own bill total by kWh used for your exact figure.
Why did my Ameren Illinois bill go up?
Rate changes are filed publicly and the table above lists the current ones with dates. Most recent increases across the region have landed in delivery and transmission rather than supply, which means switching suppliers does not avoid them.
Is solar worth it against Ameren Illinois rates?
It depends on your usage, your roof and your state's export credit structure, not on the rate alone. Use the calculator with your own numbers rather than a published average.