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
Commonwealth Edison
Investor-owned utility (Commonwealth Edison Co), regulated by the Illinois Commerce Commission. The average Illinois home pays about $110 a month for electricity (EIA, 2024).
No pending rate case for Commonwealth Edison right now
Increases approved in the last 12 months add up to about $3 a month on a typical bill. Recent decisions are below, and the alert will tell you when the next case is filed.
Decided
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
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
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.
no figure yet
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.
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Other Illinois utilities with cases
Ameren Illinois investor-owned utility
Corrections and tips: [email protected]. Every figure links to its source on the case page.