Why is my electric bill so high this month? A step-by-step check

A bill that jumps from one month to the next usually has an ordinary explanation, but ordinary explanations call for very different fixes. A longer billing cycle needs no action. An estimated read needs checking against the reading history and the utility's process for confirming usage. A heat pump stuck on backup heat needs a technician, and a supplier rate jump may need a contract change. This guide is the triage step: it helps you work out which of those you are dealing with before you spend an hour on hold.

Pull three numbers from each bill

Put this month's bill next to last month's and, if you have it, the bill for the same month last year. From each one, write down:

1. Billing days. These are usually printed with the service period dates. Cycles commonly run from the high 20s to the mid 30s of days, and a move-in, meter change or rescheduled read can stretch one further.
2. kWh used. This is the meter's measure of energy, separate from the dollar amount. Note whether the reading is labelled actual or estimated; many bills use a letter code or the word estimated beside the reading.
3. All-in price per kWh. Divide the electric charges for the period (leaving out any old balance, late fee or unrelated services) by the kWh. This folds supply, delivery, riders and taxes into one number you can compare. It is an effective average, not necessarily your tariff rate: fixed charges spread over fewer kWh can raise this number even when no rate changed.

Then calculate kWh per day for each bill. That one figure removes the distortion caused by billing periods of different lengths and is the fastest way to see whether your household actually used more energy.

Split the increase into days, usage and price

With those numbers you can divide a dollar increase into its causes. The example below uses invented, hypothetical figures for a home with a $15 monthly customer charge and a single blended usage price.

The bill rose by $108. Here is one way to split it:

• Longer cycle: five extra days at the old pace of 30 kWh per day is 150 kWh. At the old price of $0.16, that is $24.
• Higher daily usage: 10 more kWh per day across 35 days is 350 kWh, or $56 at $0.16.
• Higher price: all 1,400 kWh cost 2 cents more, adding $28.

$24 + $56 + $28 = $108, and 900 + 150 + 350 = 1,400 kWh, so the pieces reconcile. In this invented case, roughly half the increase is genuine extra consumption, a little under a quarter is the calendar and about a quarter is price. The order in which you assign the effects shifts the split slightly; what matters is spotting which factor is largest, because each one leads to a different next step.

Check whether the meter was actually read

If kWh per day jumped sharply but nothing changed at home, look at the reading type. When a utility estimates for one or more months and then takes an actual reading, the whole correction lands on one bill. A catch-up bill can therefore look like a usage spike even though the energy was used over several months. Bills issued around a smart meter installation can also combine a final read from the old meter with the first read from the new one.

Two quick checks help. First, the previous reading on this bill should match the current reading on the last bill. Second, add up the kWh for the estimated months plus the catch-up month, divide by the total days, and see whether that average looks normal for the season. If it does, billing timing may explain the apparent spike; still check the reading dates and any remaining discrepancy. How far back a utility may bill for under-estimated usage depends on your state. New York's Home Energy Fair Practices Act rights page, for example, describes a general six-month limit on backbilling, subject to exceptions; other states set different limits or apply different conditions.

If usage really rose: weather first, then equipment

Heating and cooling are the usual drivers. Compare with the same month last year: if this January's kWh per day is close to last January's, a seasonal pattern is plausible. That comparison alone does not prove the equipment is operating correctly; weather and occupancy may also have changed. The U.S. Energy Information Administration explains that electricity prices vary by season and region and reflect generation, transmission and distribution costs, so the amount you use and the price you pay can both climb in peak months.

If kWh per day is well above the same month last year in similar weather, suspect equipment. Loads that come up again and again in consumer questions include:

• Heat pump backup heat. Electric resistance auxiliary heat uses far more electricity per unit of warmth than the heat pump itself. Guidance from the Consortium for Energy Efficiency, hosted on a DOE site, describes auxiliary heat as costly and inefficient and treats a constant auxiliary indication as a possible malfunction.
• Air conditioning that runs nonstop without cooling well, or a heating strip that energizes during cooling season.
• Electric water heaters with a hot-water leak, an excessive thermostat setting or another fault confirmed by a technician, and well pumps that cycle constantly.
• New loads such as a space heater, a second refrigerator in a hot garage, a pool pump, a hot tub or an electric vehicle.

A safe way to find a continuous load is to look at your utility's hourly usage data, or note the meter display, late at night when the house is quiet. A high overnight baseline points to something running around the clock. Do not open electrical panels or meter housings to investigate; if you suspect a wiring or equipment fault, bring in a licensed electrician or HVAC technician.

If the price rose: find which line moved

When kWh per day is steady but the all-in price per kWh rose, the line items tell you why. Bills generally separate supply (the energy itself) from delivery (poles, wires, meters and grid operation), with riders, taxes and surcharges on top. Connecticut's regulator, for instance, explains in its PURA consumer FAQ that delivery and supply are billed separately and that some charges apply by usage no matter which supplier you use. Compare each line between the two bills:

• Supply rate rose. Your utility's default supply price may have reset. If you buy from a third-party supplier, a fixed-price term may have ended and rolled onto a variable rate. Check the supplier name printed on the bill.
• Delivery charge or a rider rose. Regulated delivery changes apply according to the relevant tariff and rate class; different residential plans may have different charges. You cannot switch away from them, but you can ask when the change took effect and whether it was prorated across your billing period.
• Tiered or seasonal pricing. Some utilities charge more per kWh above a usage threshold or during summer months, so higher usage can also push up the average price.

Questions to ask when you call the utility

Have both bills and your three-number comparison in front of you. Useful questions include:

• Were the readings on this bill and the previous one actual or estimated, and when was the meter last read?
• Was the meter replaced or reprogrammed during this period? If so, what were the final and starting readings?
• Can you send hourly or daily usage for the past two months, or tell me where to download it?
• Which rate schedule am I on, and did any rate, rider or seasonal price change take effect during this period?
• Is a third-party supplier listed on my account, and since what date?
• If the reading was wrong, will you issue a corrected bill, and can the disputed amount be held while you investigate?
• Can you test the meter, and is there a fee if it tests accurate?

Write down the date, the representative's name or ID and any reference number. If the answer does not match your numbers, ask for the explanation in writing.

Escalation, and what depends on your state

If the utility will not correct an evident misread or cannot explain the change, ask for a supervisor and then open a formal billing dispute. Most state utility commissions accept consumer complaints once you have tried the utility first. Rules on meter testing, backbilling limits, whether you must pay the undisputed portion, and whether a complaint pauses collection differ by state and by utility type; municipal utilities and electric cooperatives are often outside the state commission's complaint process. Connecticut's PURA, for example, notes that filing a complaint is not automatically the same as disputing a bill.

If you can, pay the part of the bill you do not dispute, so that a disagreement over one portion does not turn into a shutoff risk.

Mistakes that send people down the wrong path

• Comparing dollar totals across bills of different lengths instead of kWh per day.
• Comparing a cold month with a mild one rather than with the same month last year.
• Assuming a headline rate decrease means a lower bill; delivery charges or usage can move the other way.
• Including a past-due balance or a one-time fee when calculating price per kWh.
• Treating the appliance breakdown chart in a utility app as a measurement. Many of these charts are modeled estimates based on typical homes.
• Waiting several cycles to see whether the problem fixes itself. A hot-water leak or unnecessary backup heating can keep adding to consumption until the cause is addressed.