HomeWattCost

Ameren Illinois rates

Ameren Illinois has one residential plan modelled here. A typical Illinois home using 700 kWh a month pays about $145 a month.

Investor-owned 1,060,894 residential customers (EIA-861, 2024) Tariffs checked September 28, 2026

Typical all-in priceDS-1 / BGS-1

01234567890123456789.0123456789¢/kWh
DS-1 / BGS-1$145/mo

Residential plans

PlanTypeFixed/moJuly pricesJanuary pricesJuly weekday windows
DS-1 / BGS-1
Residential Service (DS-1 delivery + BGS-1 supply), Rate Zone I		 Tiered $16.57 20.9¢ all hours 16.7¢ 0–800 kWh · 12.3¢ over 800 kWh None

Charging an EV on Ameren Illinois

1,000 miles a month in a Tesla Model Y Long Range AWD (275 kWh from the wall, EPA 27.5 kWh/100 mi) at 7.2 kW, added to a typical Illinois home’s use, on each plan’s cheapest start hour versus plugging in at 6 pm. Averaged over the year.

PlanBest startCharging, best startCharging from 6 pmWhole bill with EV
DS-1 / BGS-1Any$46/mo$46/mo$191/mo

With an EV charged at its best hour, the cheapest plan overall is DS-1 / BGS-1. Compare plans on your own usage.

How Ameren Illinois’s plans work

DS-1 / BGS-1 (Residential Service (DS-1 delivery + BGS-1 supply), Rate Zone I). In July the first 0 kWh a month cost 20.9¢ each; then . An average Illinois home (1,005 kWh in July) stays within the first tier. Fixed charge: $16.57 a month.

Prices on this page are all-in per kWh, before taxes: base rates, supply and every per-kWh rider in the utility’s current tariff sheets. Your bill shows them as separate lines, and riders can change between tariff revisions.

As a cross-check, Ameren Illinois billed its residential customers an average of 15.26¢ per kWh in 2024 (revenue ÷ sales, EIA-861). A plan taken from URDB is shown only if its all-in price is consistent with that figure, adjusted for Illinois’s price change since.

Sources for each plan

PlanEffectiveSeasonsSolar exportsSource and status
DS-1 / BGS-1
Transcribed from the utility’s tariff		 September 1, 2026 Summer pricing Jun–Sep; winter Oct–May Not recorded in URDB Checked September 28, 2026
Ameren Illinois Rate PBR-R Appendix, Sheet 8.011 (DS-1 2026 charges; eff. 8/28/2025, Docket 25-0083) · Rate DS-1 Residential Delivery Service · HSS/PER informational sheet, Effective September 2026 (123rd) · HSS/PER informational sheet, Effective October 2026 (124th) · Plug In Illinois (ICC): Ameren price to compare, TSC 2.765 c/kWh from June 2026 · ICC Historical Prices to Compare (through Sept 2026) · Rate PBR-R Annual Adjustment Factor (3.65%, 2026) · Rider RBA charges (DS-1 3.09%, 2026) · Rider MAP-R surcharge (0.01% Apr-Dec 2026) · Rider EDITA informational filing (0.00% 2026) · Rider EE charges 2026 · Rider REA informational filing (Sept 2026) · Rider CEAC charges · Rider CSESC charges · Rider ETAC informational filing · Rider USS charges · Rider EEA charges - Rate Zone I · Rider EDR charges (0.000 since 2017) · Rider EUA charges effective June 2026 · Supplemental Customer Charges (Sheet 38) and BEAC $0.80 · UCB/POR Program Charge (Apr-Dec 2026) · Rider PSP Residential Incremental Charge · Rider ESDA charges Oct 2026-May 2027

Plans marked “Checked” were transcribed from the utility’s current tariff and rider sheets, all charges included, and are re-checked on the date shown in each file. Other plans come from the OpenEI U.S. Utility Rate Database (CC BY 4.0) and have not yet been checked line by line against the utility’s tariff. Always confirm the current rates on your utility’s website before switching plans.

Run the numbers on Ameren Illinois

EV charging cost Which plan is cheaper Best time to run things Appliance cost Solar payback Heat pump vs gas