Capacity costs baked into the summer supply price are the main channel through which data center growth is already raising Ameren Illinois electric bills.
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Ameren Illinois
Investor-owned utility (Ameren Illinois Company), regulated by the Illinois Commerce Commission. The average Illinois home pays about $110 a month for electricity (EIA, 2024).
Ameren Illinois rate increase 2026: no pending rate case right now
Increases approved in the last 12 months add up to about $4 a month on a typical bill. Recent decisions are below. See every case in Illinois, or get an alert when the next one is filed.
Decided
This is a routine annual true up of Ameren's delivery charges, not tied to data centers, and regulators said it should not noticeably move a typical bill.
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This is a gas delivery rate case, separate from electric bills, and it is not linked to data center growth.
+$4a month
Statewide matters that also hit Illinois bills
CRGA is a broad clean energy and affordability law, not a data center bill, and it is the main reason state officials point to when asked what Illinois has done so far to control electricity costs statewide.
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How to have a say
Rate cases are decided by the Illinois Commerce Commission, which takes written comments on every docket and holds public hearings on the big ones. Comment deadlines and hearing dates are on each case page above when we have them. The office that argues for households in these cases is the Citizens Utility Board; its filings are the plain-English version of the utility's numbers.
Guides: how to comment and whether it helps, what "typical bill" means, how to read your bill.
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Other Illinois utilities with cases
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Corrections and tips: [email protected]. Every figure links to its source on the case page.