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 natural gas delivery rate case
Approved Base rate case, natural gas before the Illinois Commerce Commission.
+$4a month
on a typical bill, as approved
As published by the utility or the commission.
What happens next
The decision is final; the new rate takes effect once the order sets a date. How rate cases work.
What it means for your bill
$
Fileddate not published
Hearingheld or waived
DecisionNov 19, 2025
On billsdate not published
Ameren Illinois asked the Illinois Commerce Commission for a 129 million dollar increase in natural gas delivery rates. On November 19, 2025 the ICC approved 73 million dollars instead, a 43 percent cut from the request. That works out to roughly a 3.65 dollar a month increase on a typical residential gas bill, well below the 8 to 10 dollar increase Ameren originally sought.
What it means for your bill: This is a gas delivery rate case, separate from electric bills, and it is not linked to data center growth.
- Status
- Approved
- Utility
- Ameren Illinois
- Commission
- Illinois Commerce Commission
- Typical bill change
- +$3.65 a month
- Decided
- November 19, 2025
- Last checked
- August 29, 2026
Common questions
How much will my Ameren Illinois bill go up?
Adds about $4 a month on a typical bill. As published by the utility or the commission.
When would the new rates start?
Not yet set. That is decided along with the case, usually as part of the commission's final order.
When is the hearing?
No hearing date is on record for this case.
How do I comment?
The comment period closed once this case was decided; its result is above.
Sources
- Proposed Ameren gas hike cut nearly in half by Illinois Commerce Commission, CU-CitizenAccess.org
- IL Regulators Slash Nicor, Ameren Rate Hikes, Environmental Defense Fund
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Other Ameren Illinois matters
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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