Ameren Illinois Summer Electric Rate Takes Effect June 1 and What it Means for Our Community

GraniteCityGossip.com, June 1, 2026

Ameren Illinois residential electric customers who receive their electric supply through Ameren will see a higher summer electric supply comparison rate beginning today, June 1, 2026.

According to the State of Illinois’ Plug In Illinois Price to Compare page, the Ameren Illinois residential Price to Compare is now 11.326 cents per kilowatt-hour, effective June 1, 2026 through September 30, 2026, for residential usage from 0 to 800 kWh.

That is an increase from the prior Ameren Illinois residential rate of 8.769 cents per kWh, which was in effect in May 2026 for the first 800 kWh of usage.

For comparison, the Ameren Illinois residential rate that took effect June 1, 2025 was 12.180 cents per kWh. That means this year’s June 1 rate is higher than the rate customers paid this spring, but it is still lower than the June 2025 summer rate.

Here is the comparison:
Rate Period & Rate

Ameren Illinois Residential Rate
May 2026
8.769 cents per kWh

June 1, 2026
11.326 cents per kWh

June 1, 2025
12.180 cents per kWh

The June 1, 2026 rate is an increase of about 29.2% compared to the May 2026 rate.

However, compared to the June 2025 rate, the new June 2026 rate is about 7% lower.
For a household using 800 kWh in a month, the change from 8.769 cents to 11.326 cents per kWh would amount to about $20.46 more for that portion of electric supply and transmission charges, before other bill charges, adjustments, taxes, or fees.

It is important to note that the Price to Compare is not the entire electric bill. Ameren Illinois bills also include delivery charges, taxes, fees and possible monthly adjustments. Customers who are enrolled with an alternative retail electric supplier or a municipal aggregation program may have a different supply rate.

Customers can check the “Electric Supply” section of their Ameren Illinois bill to see whether Ameren or another supplier is providing their electric supply and what rate they are being charged.

The official Plug In Illinois Ameren Illinois Price to Compare page states that the current Ameren Illinois Price to Compare is effective June 1, 2026 through September 30, 2026, and lists it as 11.326 cents per kWh for summer residential usage from 0 to 800 kWh.
The same official page explains that the Price to Compare equals electric supply charges plus the transmission service charge, and that delivery charges are separate from supply charges.

The ICC / Plug In Illinois historical Price to Compare PDF lists Ameren Illinois residential rates of 8.769 cents per kWh for May 2026 and 12.180 cents per kWh for June 2025

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The official Plug In Illinois Ameren Illinois Price to Compare page states that the current Ameren Illinois Price to Compare is effective June 1, 2026 through September 30, 2026, and lists it as 11.326 cents per kWh for summer residential usage from 0 to 800 kWh.

The same official page explains that the Price to Compare equals electric supply charges plus the transmission service charge, and that delivery charges are separate from supply charges.
The ICC / Plug In Illinois historical Price to Compare PDF lists Ameren Illinois residential rates of 8.769 cents per kWh for May 2026 and 12.180 cents per kWh for June 2025.

plugin.illinois.gov
icc.illinois.gov
ameren.com