Spending less · updated 2026-09-07

Why is my electric bill so high? Seven causes, in the order to check them

A high electric bill almost always has one of seven causes: a seasonal rate change, more days in the billing period, a tier threshold you crossed, a rate increase, an estimated reading, a new or failing appliance, or a plan that no longer suits how you use power. The first five can be confirmed from the bill alone. Check them in that order before you go looking for a mystery load.

The reflex when a bill jumps is to blame consumption — someone left something on. Sometimes that is right. More often the kilowatt-hours barely moved and the price of each one did, or the number of days did, or the meter was never read at all. The checks below go from most common to least, and each one takes a minute with the bill in front of you.

1. The season changed and so did your rate

Of the 515 household plans we track, 366 charge a different price in summer than in winter — sometimes a different price per kilowatt-hour, sometimes a different set of peak hours, sometimes both. The switch usually happens on the first of June and the first of October, and it is not announced on the bill in any way that stands out. If the jump landed on the first bill after one of those dates, compare the cents per kWh on this bill with the one before it. If the rate moved, that is your answer, and this guide explains what to do about it.

2. The billing period was longer

Billing cycles are not calendar months. A 33-day period following a 28-day one is 18% more electricity before anything else changes, and if your plan has a daily fixed charge, it is 18% more of that too. The dates are printed near the top of every bill. Divide the total by the number of days before you compare two bills; it is the only fair comparison.

3. You crossed a tier

196 of our plans are tiered: a cheap allowance, then a higher rate for everything above it. The cliff is invisible until you are over it, and a modest increase in use — a space heater, guests for a week — can push a whole block of kilowatt-hours into the expensive tier. Look for two rates on the bill with different quantities beside them. If the second quantity is larger than last month, you found it. How tiers work, and where the cliff sits.

4. The utility raised the rate

Utilities change tariffs on regulatory schedules, and the notice is usually a line in a bill insert months earlier. Supply charges in deregulated states move every month with no notice at all. Compare cents per kWh across the two bills, same tier, same period. If the number went up and your use did not, nothing you did caused this. What you can do is check whether a different plan at the same utility now costs less — the ordering of plans changes when rates change.

5. The reading was estimated

If the meter could not be read — snow, a locked gate, a broken transmitter — the utility bills an estimate based on your history, then corrects it the next time it gets a real reading. An estimated bill is marked as such, usually with a small "E" or the word "estimated" beside the reading. A large correction after a small estimate looks exactly like a sudden surge in use. Check two bills back.

6. Something new is running, or something old is failing

Only now is it worth looking at the house. The usual suspects, in rough order of how much they cost when they go wrong: an electric water heater with a failed thermostat or a slow leak in the hot line; a heat pump running on backup resistance strips because the outdoor unit iced up; a refrigerator or freezer with a failed door seal; a pool pump on a broken timer; a well pump cycling on a waterlogged tank; a space heater. Each of these can add several hundred kilowatt-hours to a month. A single light left on cannot.

Water heater: hot water at a tap that was not run recently, or a tank that is warm on the outside, points to a leak or a stuck element.
Heat pump: a bill that doubled in a cold month, with the indoor unit blowing air that is warm but not hot, suggests the backup heat is carrying the load.
Fridge or freezer: a compressor that never seems to stop, frost inside, or a seal that will not hold a slip of paper.

7. The plan no longer fits

Sometimes nothing broke. A car got plugged in, someone started working from home, a thermostat schedule changed, and the plan that was fine last year is the wrong one now. On a time-of-use plan, use that moved into peak hours costs more even if the total did not change. On a flat plan, a new overnight load is being billed at the same price as daytime use when a time-of-use plan would price it far lower. This is the one cause on the list that the bill will not show you, because the bill only knows the plan you are on.

Every utility page on this site prices all of that utility’s plans against the same household, so you can see whether yours is the cheap one or the expensive one for a house like yours. Start from your utility.

The ten-minute version

Divide each of the last three bills by its number of days. Compare those.
Compare cents per kWh, tier by tier, across the same bills.
Look for "estimated" on any of them.
If the price moved, it was the season, a tier, or a rate change — not you.
If the quantity moved and the price did not, walk the house with the list above.

A bill that is high every month, rather than suddenly, is a different question. That is usually the fixed charge, the plan, or electric heat, and the guide on comparing plans is the place to start.