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Ameren Illinois, Illinois

MISO capacity price spike hits Ameren Illinois supply charges

On bills now Supply and capacity price before the Illinois Commerce Commission.

No residential dollar figure published yet

The filing does not state a typical-bill impact we can verify. We will add one when the commission staff or the consumer advocate publishes it.

Fileddate not published
Hearingheld or waived
Decisiondecided
On billsJun 1, 2026

MISO capacity auction prices have climbed sharply, and Ameren Illinois' summer supply price rose to about 11.326 cents per kilowatt hour effective June 1, 2026, up roughly 39 percent from about 8.14 cents per kilowatt hour in summer 2024. Citizens Utility Board estimates that means Ameren customers pay almost 16 dollars more for every 500 kilowatt hours used compared with summer 2024. Capacity costs, which MISO forecasts from expected future demand, make up roughly a fifth of the supply price, and both MISO and CUB point to new and proposed data centers as a major driver of that forecast.

What it means for your bill: Capacity costs baked into the summer supply price are the main channel through which data center growth is already raising Ameren Illinois electric bills.

Status
On bills now
Utility
Ameren Illinois
Commission
Illinois Commerce Commission
On bills from
June 1, 2026
Data center linked
Yes. The filing ties part of the cost or the tariff design to data center load.
Last checked
August 29, 2026

Sources

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