Capacity costs baked into the summer supply price are the main channel through which data center growth is already raising Ameren Illinois electric bills.
no figure yet
Ameren Illinois annual electric reconciliation rate case
Approved Base rate case, docket 25-0382 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
DecisionDec 18, 2025
On billsJan 1, 2026
Ameren Illinois asked to recover 59.6 million dollars in its annual reconciliation case, which trues up prior grid spending. The Illinois Commerce Commission approved 48.4 million dollars on December 18, 2025, after consumer advocates identified wasteful spending including a bid to shift 10.7 million dollars in shareholder retirement costs onto customers, which regulators rejected. Citizens Utility Board said the approved amount should leave typical residential rates close to unchanged.
What it means for your bill: 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.
- Status
- Approved
- Utility
- Ameren Illinois
- Commission
- Illinois Commerce Commission
- Docket
- 25-0382
- Decided
- December 18, 2025
- On bills from
- January 1, 2026
- Last checked
- August 29, 2026
Sources
- CUB statement on Ameren Illinois' $48 million electric reconciliation rate hike, Citizens Utility Board, 2025-12-18
- Regulators strike millions from Ameren, ComEd electric rate hike requests, NPR Illinois, 2025-12-19
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Other Ameren Illinois matters
This is a gas delivery rate case, separate from electric bills, and it is not linked to data center growth.
+$4a month