Illinois · Investor Owned · serves 893 ZIP codes
Ameren Illinois Company rate plans
2 residential plans are currently open to new customers. None of them price by hour, so shifting when you use power won’t change your bill here.
A household using 1,000 kWh a month pays about $6,400 a year on DS-1 Residential Zone 3, the only residential plan here — $3,292 at 500 kWh, $12,439 at 2,000 kWh.
What does Ameren Illinois Company's residential rate cost?
Ameren Illinois Company files a single residential tariff, so there is no plan to choose between — everyone served here is on the same terms. That makes this page short on comparison and long on one question instead: what does that tariff actually do to a bill?
Priced hour by hour across a full year, a small apartment on this tariff comes to about $2,400 and a three-bedroom house with central air to about $5,089 — an effective 49.3¢ and 53.8¢ per kilowatt-hour once the fixed charge is spread across everything used.
With one plan and no hourly pricing, the only lever left is using less. Moving laundry or car charging to the middle of the night changes nothing here, which is worth knowing before you rearrange your evenings for no reason.
Expect the bill to swing with the weather rather than with anything you decide: the same house costs around $1,012 in July and $153 in February. Budget against the higher figure and the summer bill stops being a surprise.
How Ameren Illinois compares across Illinois
Run the same three-bedroom house with central air through its default plan at each of the 2 Illinois utilities we cover, and Ameren Illinois is the dearest of the lot at about $5,089 a year; the state median is $3,086. The cheapest, MidAmerican Energy, charges $1,084 for identical use — a gap set by the address, not by anything either household did.
The other two households tell the same story in different sizes: a small apartment pays about $2,400 here against a state median of $1,498, and the same house with an electric car charging overnight about $6,718 against $4,084. Effective rate, fixed charge included, is 53.8¢ per kilowatt-hour for the family home.
Illinois lets households choose their electricity supplier, so the supply half of this bill can be shopped separately. The figures above use the utility's own default supply price.
Every Illinois utility we cover, priced for the same three households →
Which plan would cost you least?
No bill upload, no sign-up. Tell us roughly what a month costs you and what runs on electricity — we price every plan against the same household and show you the gap.
That adds up to 6,940 kWh a year. Compare it to the total on your bill and adjust until it’s close.
| Plan | Per year | Vs best |
|---|---|---|
| DS-1 Residential Zone 3The hour never matters here — only the season. Rates peak June–September. | $3,349 | — |
An estimate, not a quote. Supply charges move month to month, and your real usage pattern is not exactly this one. What it does show reliably is the gap between plans — both are priced off the same assumptions.
Making sense of the bill
- How to read your electric bill
Four kinds of charge, only two of which you can do anything about.
- Fixed charges on your electric bill: what they are and why they matter
The line that makes cents-per-kilowatt-hour comparisons quietly wrong.
- How to compare electricity plans without getting it wrong
Six things that break a comparison, and the order to check them in.
Every plan, in detail
Hour-by-hour schedules, tier thresholds, and the tariff each one comes from.