Utility bills are designed by regulators and accountants rather than by anyone trying to make them readable. The result is a document that hides a simple structure under a lot of vocabulary. The structure is worth learning, because most advice about saving money on electricity is aimed at exactly one part of it, and in some states that part is the smaller half.
The one number that drives everything
Find the kilowatt-hours. It will be labelled kWh used, usage or consumption this period, usually near the meter readings. Everything else on the bill is either that number multiplied by a price, or a flat amount that does not depend on it.
A kilowatt-hour is one kilowatt of draw sustained for an hour. A 1,500-watt space heater running for four hours uses six kWh. The average American household uses roughly 871 kWh a month, but the range across states is more than two to one, driven mostly by climate and by whether the home heats with electricity or gas.
Ignore the single month and look for the twelve-month usage history most utilities print as a small bar chart. One month tells you about the weather. A year tells you about your house.
The two halves
Below the usage, the charges divide into two groups. Different utilities use different words for them, but the division is nearly universal.
Supply
Also called generation, energy or basic service. This is the cost of the electricity itself, and it is the part a competitive supplier sells you in states with retail choice. In a regulated state the utility buys it on your behalf and passes it through at cost, with no markup, because regulators do not allow a utility to profit on the commodity.
Supply is usually quoted as a single price per kWh. At the U.S. average of 18.44¢ for the whole bill, supply is often somewhere between a third and two thirds of that, depending heavily on the state.
Delivery
Also called distribution, transmission or the wires charge. This covers poles, lines, substations, meters, the crews who restore service after storms, vegetation management, and in many states a set of public policy programmes funded through the bill: efficiency schemes, low-income discounts, renewable procurement.
Delivery follows you regardless of who sells you the electricity. This is the single most important thing to understand before shopping for a supplier. In Massachusetts and California, delivery and policy charges have grown faster than supply for years and are frequently the larger half of the bill. Switching supplier in those states cannot move the total very much, whatever the advertising says.
The flat charges
Somewhere near the top of the charges you will find a fixed customer charge, a flat monthly amount billed whether you used one kilowatt-hour or two thousand. It exists because connecting a property to the grid has costs that do not scale with consumption.
Its size varies enormously. A few dollars in much of the Northeast, $15 to $30 in parts of the Mountain West and Great Plains. This matters when you are deciding whether efficiency work pays: if a third of your bill is fixed, cutting usage by a third does not cut your bill by a third.
Riders, adjustments and surcharges
Between the two halves you will usually find a list of smaller line items. These are riders: charges approved separately by the regulator to recover a specific cost. Common ones include:
- Fuel or purchased power adjustment. Trues up the difference between forecast and actual fuel cost, usually annually.
- Storm recovery. Recovers the cost of rebuilding after a major event. In Gulf states these are often securitised, meaning bonds spread the cost over decades, so a bill can carry surcharges from several past hurricanes at once.
- Energy efficiency. Funds the rebate programmes you are probably eligible for. Worth remembering: you are already paying for these whether or not you use them.
- Public benefits or societal benefits. Funds low-income discounts and state policy programmes.
- Capacity. In some states the cost of keeping generation available is billed separately from the energy itself.
Riders are legitimate, but they are also how a bill grows quietly. Each is approved on its own schedule, so the headline rate can look stable while the total climbs.
Taxes
State and local taxes appear at the bottom, and in some places they are substantial. A handful of states exempt residential electricity from sales tax entirely; others apply state sales tax plus a municipal utility tax plus a franchise fee. These are outside the utility's control and outside yours.
Putting it together
Work through your own bill in this order and you will have answered the useful questions in a few minutes.
| Find | Because it tells you |
|---|---|
| Twelve-month usage history | Whether your consumption is normal for your home, and how seasonal it is |
| Fixed customer charge | How much of your bill efficiency work cannot touch |
| Supply total vs delivery total | Whether shopping for a supplier can help you at all |
| Rate schedule name or code | Which tariff you are on, and therefore whether a better one exists |
| Your effective rate | Total bill divided by kWh. This, not the advertised rate, is what you actually pay |
That last line is the one most people never calculate. Divide your total bill by your kilowatt-hours. If your utility advertises 12¢ and your bill works out to 19¢, the difference is fixed charges, riders and taxes, and it is the number you should use when comparing anything.
What to do next
If supply is the larger half and you live in a retail choice state, comparing offers is worth your time. Read how retail choice actually works first, because state regulators keep finding that most residential switchers end up paying more.
If delivery is the larger half, supplier shopping is close to pointless and your levers are usage and rate schedule. Start with time-of-use rates, which are frequently the largest saving available and are almost always opt-in.
Either way, it is worth knowing where your state sits. The average bill nationally is about $155 a month, and the spread between states is wider than most people expect.