ComEd Price to Compare: The Current Supply Rate and Every Posted Month Since 2017
ComEd's residential Price to Compare is 10.399 cents per kWh, effective June 1, 2026. The current supply rate, every posted month since 2017 as a chart and table, when it resets next, and what the number does to a bill like yours.
The instrument above is ComEd's residential Price to Compare, the cents per kWh figure every supplier offer is measured against, drawn for every month the Illinois Commerce Commission has posted since January 2017. The current value is 10.399 cents per kWh, effective June 1, 2026. Every number on this page comes from the ICC's official publication, and the current window is checked against a real ComEd bill that we reconciled to its printed supply lines to the cent. We do not sell energy and we take no commission; the page exists to keep the number honest and in one place.
What is the ComEd price to compare?
The Price to Compare is what ComEd charges for the energy itself when you have not signed with a third party supplier: the electric supply charge plus the transmission services charge. For the summer window of June 1 through September 30, 2026 that is 8.677 cents of supply plus 1.722 cents of transmission, 10.399 cents per kWh in total. ComEd does not profit on this energy. It buys power through state supervised procurement and passes the cost through, which is why the number moves on a schedule instead of standing still.
One adjustment rides outside the headline number. The Purchased Electricity Adjustment is a small monthly credit or charge that trues up the difference between the posted rate and what the electricity actually cost. It is not part of the Price to Compare as posted, and the full record keeps it as its own column.
When does the price to compare reset?
The rate is set at procurement resets in June and October, so the next scheduled reset is October 1, 2026. Between resets the posted number can still drift by small amounts in other months, and the chart draws every posted month rather than an idealized two-step year, so what you see is the record, not a simplification.
The June 2026 reset moved the rate from 9.66 to 10.399 cents per kWh, an increase of 0.74 cents, about 7.7 percent. On a home using 750 kWh a month, that reset alone added about five and a half dollars a month on the supply side. The record also holds the other direction: in June 2023 the rate fell by 2.86 cents in a single reset. A rate that looked bad against last year's Price to Compare can look fine against this year's, which is exactly why the comparison has to be made against the current posted value.
What does the current rate do to a bill like yours?
A posted rate is an abstraction until it is multiplied by your usage. The instrument's panel links the free bill grader with the current Price to Compare already filled in: put in your bill total and your kWh and it shows the all-in rate you actually paid next to the rate printed on the page, which is almost always lower than the all-in number. That difference, not the headline rate, is what deciding blind costs.
If you are weighing a supplier offer, the honest comparison is the offer's cents per kWh against 10.399, on the same window, with the same treatment of any monthly fee. An offer that beats the Price to Compare saves money on the supply line; an offer that only beats last year's number does not.
The price to compare covers the supply half only
Nothing about this number touches the delivery side of the bill. Delivery is ComEd's regulated charge for the wires and it is identical no matter who supplies the energy, so a supplier switch leaves it untouched. For a residential account, supply is most of the bill and the Price to Compare is the number that matters. For many commercial accounts the weight flips.
Two things sit inside the supply half that a headline rate can hide. One is capacity, set by what a building drew during a handful of hours last summer and priced for the year that follows: an offer that quotes a low energy rate while passing capacity through separately is not comparable to one that includes it. The other is the option nobody markets, ComEd's own hourly-priced supply, Rate BESH, worth a look if your load runs outside summer afternoons.
Why supply is often not the number that matters on a commercial bill
For many commercial accounts, the demand charge on the delivery side, set by a single thirty minute interval, can rival or exceed the entire supply cost for the month, and no supplier switch touches it. This is the mechanism behind a common experience: a business switches suppliers and the bill barely moves. The switch did what a switch can do. It changed the price on the half you can shop, and it could not change the half that was running the bill.
The only way to know which half is driving your account is to look at both. The free ComEd bill reader rebuilds every charge from an uploaded bill and separates the shoppable half from the regulated half; the free demand charge tool reconciles the interval that set the demand charge against the bill.
Where these numbers come from
Every value in the chart and table is the ICC's own posted figure. The history is compiled from the Illinois Commerce Commission's Historical Prices to Compare publication, and the current value and window are cross-checked against the ICC's Plug In Illinois page for ComEd. The June and July 2026 months are additionally verified against a real ComEd residential bill whose printed supply lines we reconciled to the cent. A month the ICC has not posted does not appear here: nothing on this page is estimated, interpolated, or projected.
Download the data or cite this page
The full series is downloadable as CSV or JSON. Every row carries its source URL and retrieval date, so a row cut out of the file still says where it came from. The JSON additionally holds the full source record, including the archived copy of the ICC workbook the series was compiled from.
The compiled dataset is published under CC BY 4.0: reuse it freely, with attribution. It is also archived on Zenodo with a DOI, 10.5281/zenodo.21969015, which always resolves to the latest version. A citation that covers it:
Phantom Grid, "ComEd residential Price to Compare by month, 2017 to present," phantomgrid.io/insights/comed/comed-supply-rate/, DOI 10.5281/zenodo.21969015. Compiled from Illinois Commerce Commission, Plug In Illinois, Historical Prices to Compare.
If you are writing about Illinois supply rates and need a month, a window, or the whole series checked against the record, the data above is the record.
Embed this chart on your site
The chart is available as an embed that stays current as the ICC posts new months. Paste this where you want it to appear:
<iframe src="https://phantomgrid.io/embed/comed-ptc/"
width="100%" height="420" style="border:0;border-radius:12px;"
loading="lazy" title="ComEd Price to Compare, current and historical">
</iframe>
The embed carries its own source line and a link back to this page. Use it freely; the same CC BY 4.0 terms as the dataset apply.