Why is my electric bill so high?

Start with kilowatt-hours, not dollars

A bill can rise for two completely different reasons: you used more electricity, or electricity got more expensive. They call for opposite responses, and the dollar total cannot tell them apart. The kilowatt-hour figure can.

Find the kWh on your bill and compare it with the same month last year, which most utilities print alongside. If the kilowatt-hours are flat and the dollars are up, you have a rate problem and nothing in your house needs fixing. If the kilowatt-hours are up, something is running that was not running before.

The four causes, in the order they are likely

Ranked by how often they turn out to be the answer, not by how interesting they are.

1. Electric heat, engaging more than you think

This is far and away the most common cause of a winter bill that doubles or triples. If you have a heat pump, it has a backup resistance heater for the coldest days, and that backup uses roughly three times the electricity per unit of heat. A thermostat set to recover several degrees quickly, a defrost cycle running often, or an outdoor unit iced up will all call for it. The bill does not distinguish, so the increase looks mysterious.

At the US average rate of 18.34¢/kWh. The gap is what a heat pump running on its backup element costs you.
Heating a home for a winter	Electricity	Cost
Heat pump, working normally	2,307 kWh	$423
Resistance heat doing the same job	9,012 kWh	$1,653

2. Electric water heating, quietly

A tank loses heat to the room every hour of the year whether or not anyone showers, and it is the second largest end use in most all-electric homes. It rarely causes a sudden spike, but it is often the reason a bill that never seemed to have a cause is simply always high. A failed lower element or a stuck thermostat can also make it run continuously without anyone noticing anything except lukewarm water.

3. Air conditioning, with the setpoint doing the damage

Cooling has the widest geographic spread of any end use in the country. The EIA puts the hot-humid average at more than four times the marine-climate average. Within one house, the sensitivity to setpoint is what people underestimate: each degree is worth roughly 3–5% of cooling energy, so the difference between 72°F and 76°F is not small.

4. One appliance nobody counted

If heating, water and cooling all check out, it is a single device. The profile is always the same: it has a compressor or a heating element, it runs unattended, and it is somewhere you do not walk past.

Each of these is capable of being the whole of an unexplained increase on its own.
The usual suspects	A year	A month
Garage refrigerator	$130	$11
Hot tub	$602	$50
Pool pump	$396	$33
Dehumidifier	$228	$19
EV charging (Level 2 home)	$649	$54
Grow light	$322	$27

What normal looks like where you live

Before deciding your bill is abnormal, it is worth knowing what a household in your part of the country actually uses. The spread is much wider than most people expect, and a bill that looks alarming against a national average can be unremarkable against a regional one.

EIA RECS 2020, table CE4.6. End-use figures are conditional means — the average among households in that division that use electricity for that purpose — so they do not sum to the total.
Census division	Total a year	Electric heating	Cooling	Water heating	At US average rate
East South Central	13,882 kWh	3,477 kWh	2,812 kWh	2,958 kWh	$2,546
West South Central	13,609 kWh	2,482 kWh	3,873 kWh	2,766 kWh	$2,496
South Atlantic	13,089 kWh	2,401 kWh	3,112 kWh	2,767 kWh	$2,401
West North Central	10,705 kWh	3,472 kWh	1,728 kWh	2,870 kWh	$1,963
Mountain	10,500 kWh	1,795 kWh	2,918 kWh	2,550 kWh	$1,926
East North Central	9,345 kWh	2,919 kWh	1,425 kWh	2,673 kWh	$1,714
Middle Atlantic	8,275 kWh	2,287 kWh	1,483 kWh	2,528 kWh	$1,518
Pacific	7,665 kWh	1,864 kWh	1,514 kWh	2,588 kWh	$1,406
New England	7,308 kWh	1,748 kWh	1,136 kWh	2,124 kWh	$1,340
United States	10,566 kWh	2,484 kWh	2,318 kWh	2,706 kWh	$1,938

The extremes: a East South Central household averages 13,882 kWh a year against 7,308 kWh in the New England — 1.9× as much, for the same national appliances. Cooling is wider still: 3,873 kWh in the West South Central against 1,136 kWh in the New England, a factor of 3.4×. Any article that quotes one national figure for “what air conditioning costs” is describing nowhere in particular. Your own state’s page uses its division’s figures rather than the national ones.

Do the subtraction

Guessing which of the four it is has a poor hit rate. Subtracting is better: take your actual annual kilowatt-hours, subtract what your end uses should account for, and look at what is left. If the remainder is a quarter of the bill, your house is normal and the answer is the rate or the weather. If it is half, there is a specific device to find.

What not to bother with first

Unplugging phone chargers, changing already-LED bulbs, and switching off a television at the wall are all real savings and all far too small to explain a bill that has jumped. A realistic whole-house always-on load is under a hundred watts.

One watt drawn continuously costs $1.61 a year. Chasing ten watts of standby saves $16. Finding a second refrigerator saves $130. Spend your attention accordingly — and if you want the full arithmetic, the always-on calculator totals a whole house.

Questions

My bill doubled in one month. What is it?

In winter, backup resistance heat on a heat pump. In summer, air conditioning combined with a heatwave, or an AC low on refrigerant running continuously without reaching setpoint. In any season, if the weather did not change, look for a device that started running unattended: a freezer with a failed seal, a well pump short-cycling, or a hot tub whose cover has taken on water.

Could my meter be wrong?

It is possible but uncommon, and there is a cheap test. Switch off everything in the house at the breaker panel and watch the meter. If it is still registering consumption, either something is wired around the panel or the meter has a fault, and both are the utility’s to investigate. Note that utilities also sometimes estimate a reading rather than take one, so a “catch-up” bill after several estimated months is a billing artefact rather than a usage change.

Is my old refrigerator really costing that much?

A pre-2000 full-size refrigerator commonly uses two to three times what a current one does, and a second unit in an unconditioned garage works harder still because the ambient temperature is higher. It is the single most common answer to an unexplained standing increase.

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