How to Read Your Electric Bill

Most people read an electric bill from the bottom up: find the amount due, wince, pay it. The useful information is further up, and it takes about five minutes to extract. By the end of this you should be able to say what you used, what you paid per unit, and whether a change came from your usage, your rate or the calendar.

Start with the billing period

Find the service period and count the days it covers. Meter reads land on a route schedule, not on the first of the month, so a period can run 28 days or 34. That count drives the total more than most people expect: more days means more usage, and on most plans the same fixed charge covers a longer span. DOE's bill guide has a name for correcting this when you compare periods — calendarization, allocating usage and cost to standard periods.

Find your total electricity use

Your usage line is a subtraction, not a measurement: current meter reading minus previous meter reading. If both readings are printed, do it yourself and check the result matches the kWh billed. For scale, EIA puts the average U.S. residential customer at 10,791 kWh a year, about 899 kWh a month, on 2022 data — with Louisiana averaging 14,774 kWh and Hawaii 6,178.

Supply and delivery charges

Most bills split into two families. Supply — also labelled generation or energy — is the electricity itself. Delivery covers getting it to you: EIA lists the transmission and distribution system as its own cost component, carrying construction, operation and maintenance costs, and notes that residential customers pay more per kWh than industrial ones partly because distributing to them costs more.

Whether these appear separately depends on your state. EIA notes that some states fully regulate prices through a public utility commission while others combine unregulated generation prices with regulated transmission and distribution. In a restructured state you may see two suppliers on one bill; in a fully regulated one, a single bundled charge.

Fixed charges, variable charges, and the rate you actually paid

Sort every line into two buckets: charges that move with kWh and charges that do not. The fixed bucket is why your bill is never zero in a month away from home, and why cutting usage never cuts the total proportionally.

Then compute the only rate that describes your bill: total amount due divided by kWh used. DOE's guide calls this the blended cost of electricity and computes it exactly that way. It will exceed the per-kWh supply rate printed on the bill, because the fixed charges and taxes are folded in. When you cost an appliance, this is the number to use.

The arithmetic in one place

Eight lines cover almost everything you can work out from a bill. None of it needs more than a phone calculator.

• Electricity used: current meter reading − previous meter reading = kWh.
• Variable energy charge: kWh used × rate = charge.
• Rate you actually paid: total amount due ÷ kWh used.
• Daily usage: total kWh ÷ billing days.
• Daily cost: total amount due ÷ billing days.
• Usage change: current-period kWh − previous-period kWh.
• Usage change as a percentage: (current kWh − previous kWh) ÷ previous kWh × 100.
• Fair comparison: daily usage this period against daily usage last period — never the totals.

Time-of-use and tiered rates

If your bill shows several rates, you are on a structure that varies price by time or by quantity. With time-of-use pricing, DOE's guide puts it simply: the time energy is used determines its price. Utilities set on-peak windows when the grid is strained, off-peak windows when it is not, and some add a shoulder rate in between. On-peak periods may apply year-round or only in summer months.

Tiered or block rates change price by quantity instead. California's PUC describes a baseline quantity billed at a lower rate, with usage above it charged at higher rates through successive tiers. The thresholds, the hours and the seasonal rules are all set in your tariff — no two utilities are obliged to match, and weekends and holidays are often treated differently. Read your own rate schedule; DOE notes these are public documents.

Taxes, riders, credits and adjustments

Below the energy lines sit the charges that are not electricity. DOE's guide groups them as riders — programme costs the utility recovers separately from its base rates — and non-energy charges. They are legitimate and usually small individually, but they accumulate, and they are part of why the rate you actually paid exceeds the rate printed on the bill.

Credits work in the opposite direction and are easy to misread. A credit is not a payment: it reduces what you owe, and where it came from matters. A one-off correction after a disputed reading behaves differently from a recurring assistance credit or a solar export credit that rolls forward. If a total drops sharply, check whether usage fell or a credit landed before crediting yourself with the saving.

A worked example

How to compare two electric bills

Comparing totals is the mistake. Two periods rarely cover the same number of days, so normalize to a daily figure before drawing any conclusion.

The bill rose 10% and total usage rose 7.7%, yet daily usage fell almost 9%. The household used less electricity per day than the month before; it was billed for five extra days at a slightly higher supply rate. Had you compared only the totals, you would have gone looking for a problem that was not there.

Estimated readings and catch-up bills

Not every reading is taken. When a utility cannot access the meter it may estimate, and Maryland's PSC requires that an estimated reading be marked as estimated on the bill, with an internal record of why. Rules on this are set state by state. An estimate is not automatically wrong — but the correction lands at the next actual read, so a bill can look alarming while reflecting two months of reality rather than one.

Maryland also notes practical options: ask whether a remote reading device can be installed, or submit your own reading if your utility accepts one. If an estimate is far out of line with normal usage you may be able to ask for it to be cancelled — with the consequence that the following bill then covers the whole two-month span.

Solar credits and net metering

A bill with rooftop solar behind it reads differently: expect separate figures for energy imported from the grid and energy exported to it, a credit for the exports, and often a balance carried forward rather than paid out. Fixed charges usually remain regardless of how much you exported. What exports are worth, whether credits expire, and how they roll over are set state by state and revised periodically, so nothing national can be said about the amount. Your interconnection agreement and tariff are the documents that answer it.

When to contact your utility

What to do next

Pull your last two bills. Write down four numbers for each: billing days, kWh, total due, and total divided by kWh. Then divide kWh by billing days. Those five figures per bill will explain almost every change you are likely to see, and they turn the next bill from a number you accept into one you can check.