Tool
Commercial electricity bill calculator
Enter the components from a commercial bill. The calculator separates what a supplier can price from what stays regulated, and shows the arithmetic.
On this worked example a commercial account using 100,000 kWh pays $12,464.40, an all-in rate of 12.46¢/kWh. Only $6,420.00 of it — 52% — is supply that a competitive supplier can price. 47% is delivery, demand and fixed charges that stay regulated.
Source: Calculation engine v1.0.0 · 2026-10-31
The formulas
These are the whole engine. There is nothing hidden behind them, and no language model performs this arithmetic.
subtotal = supply + delivery + demand + fixed + riders taxes = subtotal x taxRate total = subtotal + taxes allInPerKwh = total / kWh supplyPerKwh = supply / kWh deliveryPerKwh= (delivery + demand + fixed + riders) / kWh
Where to find these numbers on your bill
Commercial bill layouts vary by utility, but the components are consistent and they are almost always grouped rather than scattered.
| Input | Usually labelled | Where to look |
|---|---|---|
| Billing period kWh | Usage, consumption, kWh billed | Near the meter reading section, with the read dates |
| Supply charges | Supply, generation, energy charge, or the supplier’s own section | Often a separate block, sometimes a separate page or a separate bill entirely |
| Delivery charges | Delivery, distribution, transmission | The utility section, charged per kWh |
| Demand charges | Demand, billing demand, kW charge | Only present if the account is demand-metered; look for a kW figure |
| Fixed charges | Customer charge, service charge, meter charge | A flat monthly amount that does not move with usage |
| Riders and surcharges | Rider, adjustment, recovery, surcharge | Usually several small lines within the utility section |
Two things are worth checking while you are there. If supply and delivery arrive as two separate bills, you need both — a comparison built on one of them is incomplete. And if you cannot find a demand charge, confirm whether the account is demand-metered at all, because that single fact changes which rate schedules you are eligible for.
For the mechanics behind these numbers: supply vs delivery, demand charges and how to read a commercial bill.
What this calculator will not tell you
- A rate you can buy. Commercial supply pricing depends on territory, rate schedule, load shape, demand, term, start date and credit. Nothing on a public page is your executable price.
- Whether you should switch. That needs your actual rate schedule, contract terms and expiry, plus conforming offers from qualified suppliers.
- Your savings. We do not estimate savings from a bill split alone, and we do not forecast a renewal price.
Send the bill itself and a person will look at it properly: rate schedule, demand structure, ratchet exposure, contract window. Nobody calls unless you ask.