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.
+$3a month
ComEd large load (data center) tariff and consumer protection investigation
Approved Rider or surcharge, docket 25-0677/25-0679 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
DecisionMar 20, 2026
On billsdate not published
ComEd told regulators it has 75 pending customer applications, mostly data centers, whose combined power demand is bigger than ComEd's entire all time record peak. On March 20, 2026 the Illinois Commerce Commission approved new ComEd tariff rules requiring large data center customers over 50 megawatts to post security deposits, starting at 1 million dollars, so ComEd can recover costs if a project is cancelled or never fully used. The ICC also ordered a separate investigation, due to start by April 23, 2026, into how to keep the cost of new substations and power lines built for data centers from being shifted onto regular households.
What it means for your bill: 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.
- Status
- Approved
- Utility
- Commonwealth Edison
- Commission
- Illinois Commerce Commission
- Docket
- 25-0677/25-0679
- Decided
- March 20, 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
- ICC looks to develop consumer protection framework amid increase in large energy demand, Illinois Commerce Commission, 2026-03-20
- Regulators OK ComEd's plan to increase deposit costs for large-load projects like data centers, Capitol News Illinois, 2026-03-20
- Illinois regulators launch investigation into consumer protection against data center costs, pv magazine USA, 2026-03-23
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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