This case does not change what a household pays today, but it is the main tool Illinois regulators are using to try to stop the cost of new grid equipment for data centers from landing on residential bills.
no figure yet
ComEd annual reconciliation rate case
Approved Base rate case, docket 25-0383 before the Illinois Commerce Commission.
+$3a month
on a typical bill, as approved
As published by the utility or the commission.
Fileddate not published
Hearingheld or waived
DecisionDec 18, 2025
On billsJan 1, 2026
Under an Illinois law that lets ComEd true up its grid plan spending every year, the utility asked to recover 268.5 million dollars in a reconciliation case. The Illinois Commerce Commission approved 243.1 million dollars on December 18, 2025, cutting about 25.4 million dollars including costs tied to a mismanaged customer billing system rollout. Citizens Utility Board estimated the approved amount adds about 3.10 dollars a month to a typical residential bill starting in 2026.
What it means for your bill: This is a routine annual true up of ComEd's delivery charges, not something tied to data centers, and it adds a few dollars a month to a typical bill.
- Status
- Approved
- Utility
- Commonwealth Edison
- Commission
- Illinois Commerce Commission
- Docket
- 25-0383
- Typical bill change
- +$3.10 a month
- Decided
- December 18, 2025
- On bills from
- January 1, 2026
- Last checked
- August 29, 2026
Sources
- CUB statement on ComEd's $243 million reconciliation rate hike, Citizens Utility Board, 2025-12-18
- Regulators strike millions from Ameren, ComEd electric rate hike requests, Capitol News Illinois, 2025-12-19
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Other Commonwealth Edison matters
This is the single biggest reason ComEd bills jumped in summer 2025 and again in 2026, and PJM and consumer groups both tie it directly to data center demand growth.
+$11a month
This is the base multi-year plan that sets the delivery portion of a ComEd household bill through 2027, separate from the newer data center specific tariff cases.
no figure yet