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SampleA real ComEd home bill with the numbers changed, not yours. Sixteen charge lines in three sections, each of which has to add up to its own printed subtotal before anything else is claimed.
Residential ComEd bill / Residential - Single
What a bill like yours proves
May 1, 2026 to Jun 2, 2026 (32 days)
16 lines read, 11 recompute to the cent from their own printed rate, 4 checked against filed records (ComEd filed ratebook, ICC posted price to compare).
All 16 charge lines, read, and they add up to $281.06
Every line on your bill was extracted and re-added. The computed total matches the Service Period Total ComEd printed, which is how you know nothing was missed or misread.
How, and the source
How
sum of 16 line items = $281.06 = printed total
Source
Your bill, charge details section
What this bill settles
You are on ComEd's Single Family Without Electric Space Heat delivery class
We did not take this from the label on your bill, which does not say whether the home has electric space heat. We rebuilt the Distribution Facilities rate for all four residential delivery classes we hold and found the one whose rate matches the rate printed on your bill. We do not hold ComEd's rules for which class a customer belongs in, so this is the class you are billed on, not a check that it is the right one.
How, and the source
How
printed $0.06333/kWh matches Single Family Without Electric Space Heat in the June 2026 billing period
Source
ComEd filed ratebook, matched to your bill
Price to compare: 10.399 c/kWh; you paid 10.629 c/kWh
ComEd printed a price to compare of 10.399 cents per kWh. Your supply and transmission rates add to 10.399 cents, which is the same number -- consistent with being on ComEd's default supply rather than a retail supplier. What you actually paid for supply was 10.629 cents per kWh, because the price to compare excludes the purchased electricity adjustment and your bill includes it.
Your bill, supply section and the price-to-compare notice
You have no demand charge, so peak shaving saves you nothing on delivery
Your delivery charges are billed entirely on how much energy you use, not on how fast you use it. Cutting a short spike in your usage would not reduce this bill by a cent. Anyone selling you a residential battery on demand-charge savings in ComEd territory is selling a saving that does not exist on this rate.
How, and the source
How
Distribution Facilities Charge billed per kWh, not per kW
What you paid to buy the electricity, what you paid to have it delivered, and what you paid in taxes, fees and credits. Each section was re-added against its own printed subtotal.
How, and the source
How
Supply: lines sum to $161.35 vs printed $161.35; Delivery: lines sum to $117.44 vs printed $117.44; Taxes, fees and credits: lines sum to $2.27 vs printed $2.27
Source
Your bill, charge details section
The ICC posted 10.399 c/kWh for June 2026, the price your bill printed
The Illinois Commerce Commission posts ComEd's residential price to compare every month, and for June 2026 it posted 10.399 cents per kWh, the same figure your bill printed. That is a check against a source other than the bill itself. Your bill covers May 1, 2026 to June 2, 2026. ComEd's posted price rose from 9.660 (May 2026) to 10.399 (June 2026), and your supply lines were billed at the later figure for the whole period. On your 1,518 kWh the difference between the two postings is $11.22. A year earlier, June 2025's posting was 10.028, so this price is 0.371 cents higher than the same month last year. The ICC also posted the purchased electricity adjustment for June 2026 at 0.230 cents per kWh; the adjustment on your bill works out to 0.230 cents per kWh on the same 1,518 kWh, which agrees.
How, and the source
How
printed 10.399 c/kWh = ICC posting for 2026-06; (10.399 - 9.660) c/kWh x 1,518 kWh = $11.22; PEA $3.49 / 1,518 kWh = 0.230 c/kWh vs posted 0.230
Source
Illinois Commerce Commission, Historical Prices to Compare for ComEd, retrieved 2026-08-31; residential non-space-heat class
All-in rate: 18.52 cents per kWh
Everything on the bill divided by the energy you used. This is the number to use when comparing against anything quoted in cents per kWh.
How, and the source
How
$281.06 / 1,518 kWh = 18.515 c/kWh
Source
Your bill
13 months of usage, from 1,259 to 2,894 kWh a month
Your highest month was August at 2,894 kWh; your lowest was May at 1,259 kWh. That is a 2.3x swing across the year.
1,519Jun
2,694Jul
2,894Aug
2,513Sep
1,853Oct
1,482Nov
1,810Dec
2,796Jan
2,122Feb
1,742Mar
1,489Apr
1,259May
1,518Jun
How, and the source
How
max 2,894 / min 1,259 = 2.30x
Source
Your bill, the usage graph
What your bill cannot tell you
A monthly statement does not contain the data to answer these.
When did you actually use the electricity?
Your bill resolves your usage to 13 monthly totals. A month is roughly 2,900 half-hours, and the bill collapses all of them into one number. Nothing on it distinguishes 3am from 3pm.
Interval data: your usage every 15 or 30 minutes.
What is your peak demand, and when does it happen?
Residential bills do not measure demand at all. Your meter records it, but nothing on the bill reports it. It is the number that decides whether a battery or a service upgrade is sized correctly.
Interval data: the maximum interval, with its timestamp.
What does your always-on floor cost you?
Every building has a base load that never switches off. It is typically the largest single line in an annual energy bill and it is the one nobody ever decided to buy. The bill cannot separate it from everything else, because it never sees your usage at rest.
Interval data: the overnight trough is the floor, and we already compute it.
Would a different rate have been cheaper?
ComEd's hourly pricing rate settles against what you used in each hour. Your bill does not record hours, so this is not merely unknown from a bill -- it is unanswerable from one, for anybody, including us.
Interval data priced against the hourly rate for the same period, hour by hour.
The bill reader: your electric bill read line by line, and the ComEd delivery charges we hold filed rates for checked against those rates
On a ComEd bill, the delivery charges we hold ComEd's filed rates for are rebuilt from those rates, for the billing periods those filings cover, and every other line is checked against the bill itself. A bill from any other utility is read as far as the reader can take it.
The reading built from your own ComEd interval data is $99. The first two are waived. Once that data arrives, the interval analyzer and the reconciliation tool read it, and both are free.
It is read once, in the moment, and discarded. We do not write it to disk, we do not keep a copy, and nothing on it is sold or shared.
When the reader refuses a bill whose layout it does not know, that screen may offer to keep the one bill so we can teach the reader that layout. On your ticked consent, the PDF is stored encrypted and deleted when your reading is delivered or at day 30, whichever comes first. Without that tick, the promise above holds.
