The two numbers that matter
Find the kilowatt-hours and the total amount due. Everything else on the page is a breakdown of how the second was derived from the first.
The kilowatt-hour figure is the physical quantity you consumed, and it is the only line that reflects your own behaviour. The total is that quantity multiplied by rates you did not choose, plus charges that would apply whether or not you switched anything on. Watching the dollars alone tells you nothing about whether you used more electricity, because the rate moves too.
Working out what you really pay
Divide the total amount due by the kilowatt-hours. That single division gives your effective rate — what a kilowatt-hour actually costs you, including the fixed charge, the delivery charges, the riders and the taxes.
A worked illustration, not your bill. Note the effective rate falling as consumption rises — the fixed charge is spread over more units.
| If you used | Energy at 18.34¢ | Plus a $12 fixed charge | Effective rate |
|---|---|---|---|
| 400 kWh | $73 | $85 | 21.3¢ |
| 700 kWh | $128 | $140 | 20.1¢ |
| 1,000 kWh | $183 | $195 | 19.5¢ |
| 1,500 kWh | $275 | $287 | 19.1¢ |
That table shows something people find counter-intuitive: the less electricity you use, the more each unit costs you, because the fixed charge is divided across fewer of them. A very frugal household can pay an effective rate a third higher than a heavy user on exactly the same tariff. It is also why the published state averages on this site sit slightly below what most households actually pay.
The lines you cannot change
| Line | What it is | Can you reduce it? |
|---|---|---|
| Basic / customer / service charge | A fixed monthly fee for being connected | No. It applies at zero consumption. |
| Energy or supply charge | The electricity itself, per kWh | Yes — this is the one your behaviour moves. |
| Delivery / distribution charge | Moving it over the wires, usually per kWh | Yes, indirectly, since it scales with consumption. |
| Riders and surcharges | Recovery of specific programme or infrastructure costs | No. |
| Taxes and franchise fees | Local and state levies, usually a percentage | No. |
| Demand charge (uncommon residentially) | Based on your highest short-interval draw | Yes, by not running large loads simultaneously. |
The practical consequence is that a household using zero electricity would still receive a bill. In most of the US the fixed portion runs somewhere between eight and twenty dollars a month, so a realistic floor for a connected home is well above zero however carefully anyone behaves.
Estimated readings, and the catch-up bill
Utilities sometimes estimate a meter reading rather than taking one, and estimated months are usually marked with an E or a footnote. If several estimates ran low, the first real reading produces a large catch-up bill that looks like a sudden spike and is nothing of the kind — it is several months of under-billing arriving at once.
The tell is that the kilowatt-hours on the catch-up bill are far above the pattern while the preceding months were suspiciously flat. Before investigating your house, check whether the readings either side were estimated.
Budget billing, and why it hides things
Many utilities offer to average your annual cost across twelve equal monthly payments — budget billing, levelised billing, or a similar name. It makes cash flow predictable, and it makes diagnosis considerably harder, because the amount you pay stops responding to what you use.
On budget billing the dollar figure is meaningless as a signal. A fault that doubles your consumption in January shows up as a large true-up months later rather than as a bill you notice at the time. If you are on it, the kilowatt-hour line is the only thing worth watching — and the annual reconciliation is the moment to check whether the year actually went as expected.
If you have solar
A bill with net metering carries additional lines and a different arithmetic. Consumption, generation and net are separate figures, and the credit you receive for exported electricity is often at a different rate from the one you pay for imported. That difference is the entire economics of a residential array.
- Total consumption is still what the house used, and it is still the number for any appliance calculation on this site.
- Exported kilowatt-hours are what went to the grid, credited at whatever rate your programme specifies — increasingly below the retail rate.
- Net is the difference, and it is what you are billed for. A net of zero does not mean a bill of zero: the fixed charge still applies, and many jurisdictions add a separate charge for grid-connected generators.
The practical point is that self-consumption beats export wherever the export rate is below the retail rate — which makes shifting large loads into daylight hours worth real money, the mirror image of the time-of-use advice for households without panels.
What to do with the numbers once you have them
- Note the kilowatt-hours and compare them with the same month last year, which most bills print. That comparison separates a rate rise from a usage rise.
- Divide total by kilowatt-hours to get your effective rate, and use that figure — not a state average — in the calculators here.
- If you have twelve months of data, use the annual total. One month describes the weather; a year describes the house.
- Then break it down against the end uses your home actually has, and look at what is left over.
Many utilities now publish hourly or fifteen-minute interval data through their customer portal, free. That is considerably more informative than the bill and enough to spot a heater cycling overnight or a pump running when the house is empty — it is worth checking whether yours does before buying anything to measure with.
Questions
How do I work out my electricity rate per kWh?
Why is my bill high when I barely used electricity?
What does an estimated reading mean?
Should I compare dollars or kilowatt-hours month to month?
All guides · How the figures are computed · Break down your own bill