by time of day and by season · plus $19.27 per month · covers delivery and default supply — delivery plus the utility's default supply; a customer who buys supply elsewhere pays the delivery part only
effective2026-08-01
transcribed2026-08-20
today2026-10-08
Monthly bill on default supply
Usage
cheapest hours
most expensive hours
500 kWh
$91.06
$135.76
1,000 kWh
$162.84
$252.25
2,000 kWh
$306.42
$485.24
This plan prices by time of day, so a monthly total alone does not determine the bill. The columns are the bounds: every kWh in the cheapest period, and every kWh in the dearest. A real bill falls between them, and where it falls is what this plan is asking you to change. Delivery plus this utility's default supply. A customer who switched supplier pays the delivery part and their supplier's rate instead.
Before taxes, franchise fees and any local surcharge.
Provenance
no published total to check against
sourceComEd Schedule of Rates for Electric Service, Ill.C.C. No. 10
verifiedTranscribed from the utility's filed sheetComEd Schedule of Rates for Electric Service, Ill.C.C. No. 10
verifiedEffective date on the sheet: 2026-08-01
approximateNo published total to reconcile the whole rate againstSUPPLY HALF ONLY, AND NOT EVEN ALL OF IT. The Illinois Commerce Commission publishes a Price to Compare for ComEd of 10.399 cents/kWh effective 1 June 2026 for the summer period through 30 September, being an 8.677 cent
verifiedSource document checked daily for changes
approximateThis is not a whole billdelivery and default supply — delivery plus the utility's default supply; a customer who buys supply elsewhere pays the delivery part only
excludedTaxes, franchise fees and local surchargesJurisdiction-specific, so they are deliberately not encoded. A bill will be higher than this figure by that amount.
Energy rates
Period
Applies to
$/kWh
summer morning, 6am-1pm June-September
all usage
$0.15922
summer mid-day peak, 1pm-7pm
all usage
$0.23299
summer evening, 7pm-9pm
all usage
$0.15633
summer overnight, 9pm-6am
all usage
$0.14794
nonsummer morning, 6am-1pm October-May
all usage
$0.15486
nonsummer mid-day peak, 1pm-7pm
all usage
$0.22863
nonsummer evening, 7pm-9pm
all usage
$0.15197
nonsummer overnight, 9pm-6am
all usage
$0.14358
Other plans at this utility
Encoded from the same tariff book, on the same day. Which one
you are on is on your bill; which one you are eligible for is set by the
utility, not by this page.
Transcription notes recorded when this tariff was encoded, including anything deliberately left out.
ILLINOIS IS A THIRD MARKET STRUCTURE. Not bundled like California and not wires-only like Texas: ComEd always provides delivery, and provides supply by default, but a customer may buy supply from a retail supplier or a municipal aggregation instead. These figures are the default-supply bill. A customer who has switched pays ComEd's delivery plus their own supplier's rate, so the supply component here does not apply to them.
DELIVERY CLASS, NOT TERRITORY. ComEd's residential classes are Single or Multi Family, each With or Without Electric Space Heat - four classes keyed to dwelling and heating type rather than geography. Encoded here is Single Family Without Electric Space Heat, the largest. The others differ substantially: Single Family WITH electric space heat pays less than half the distribution charge per kWh.
THE ADJUSTMENT STACK. Delivery charges are not billed as filed. Each is multiplied by IDUF + DRAF + EDAF + TPAF + RBAFD = 1.100563, with the distributed-generation adjustment added afterwards. The five terms come from five separate informational sheets with effective windows that do not align - IDUF runs June to May, DRAF April to December, TPAF and RBAFD by calendar year.
The Illinois Electricity Distribution Tax charge uses a SHORTER stack - IEDT x (IDUF + RBAFD) = 1.028268 - and getting this wrong is invisible because both multipliers are close to 1.
SUPPLY IS NOT MULTIPLIED. The published Purchased Electricity Charges already incorporate both the supply base and incremental uncollectible factors; Sheet 1 notes (3) and (4) say so. Applying them again would double-count.
SHORT SHELF LIFE. The Purchased Electricity Adjustment changes EVERY MONTH - it is a credit of 0.142c in August 2026 and was a charge of 0.247c in July. The renewable and zero-emission riders are filed only through August 2026. No encoding of ComEd is current for more than about four weeks, which is a fact about ComEd rather than about this catalogue.
THE BOOK CONTAINS ITS OWN SUPERSEDED RATES. Informational Sheet 24 is the Rate DSPP residential schedule carrying 2022 and 2023 charges, and it appears before Sheet 64 in the extracted text. Reading the document in order yields rates three years old that look entirely plausible.
EXCLUDED: Rider TAX (municipal and state tax additions) and Rider FCA (franchise cost additions). Both vary by municipality.
TIME OF USE APPLIES TO DELIVERY, NOT SUPPLY. This is the opposite of every other time-of-use plan in the catalogue, where the peak signal is in the energy price. Here the supply charge is flat and the DISTRIBUTION charge varies by hour - it is a network-congestion signal, not a generation-cost one.
EVERY DAY, INCLUDING WEEKENDS. Sheet 67 note (2) states the periods apply 'every day', so unlike DTE, SCE and PG&E there is no weekend exemption from the peak.
Four periods: Morning 6am-1pm, Mid-Day Peak 1pm-7pm, Evening 7pm-9pm, Overnight 9pm-6am, all Central Prevailing Time. The Mid-Day Peak is six hours long, wider than any other peak in the catalogue.
The spread is entirely in the delivery component, so it looks smaller than a California plan's: 10.712c against 2.984c before adjustments, but only about 1.5x once the flat supply and riders are added.
Think a figure here is wrong?
Email support@rategrid.dev
with this plan's name and what the filed sheet says. Every rate on this page was
transcribed from the document linked above, so a report that quotes the sheet can
be checked against it and corrected.
Change history
The source document is fetched daily and every version is kept.
Utilities do not publish superseded rates, so this record does not exist
elsewhere once a rate changes.
No changes detected since monitoring began. The source sheet is checked daily.