How to Read Your Electricity Bill Line by Line

Most of your bill comes down to three things: how many kilowatt-hours (kWh) you used, the per-kWh rates applied to that usage, and the fixed and delivery charges that apply whether you use a little or a lot. If you read those three parts first, the total stops being a mystery.

Start with three numbers: kWh used, billing period, and total due

Find the billing period first. A 33-day bill looks larger than a 28-day bill, even if your daily use did not change.

A kilowatt-hour is the energy used by a 1,000-watt appliance running for one hour. The formula is: watts x hours used / 1,000.

A 100-watt bulb for 10 hours uses about 1 kWh, and a 1,500-watt space heater for two hours uses about 3 kWh.

Compare kWh, not just dollars. Flat kWh with higher dollars means a rate or fixed charge changed, while jumped kWh means something used more energy.

Supply charges: the price of the electricity itself

Supply is the cost of the electricity used, priced per kWh.

National context only, not a quote for any home: the U.S. Energy Information Administration (EIA) forecast in January 2025 that the average U.S. residential electricity price would be 16.8 cents per kWh in 2025, about 2% higher than in 2024.

Your own bill's rate is the number that matters, since rates vary by state, utility, and plan.

Delivery charges: the cost of getting power to your home

Delivery, including transmission and distribution, pays for poles, wires, transformers, meters, meter reading, and maintenance.

It often mixes a fixed monthly amount with a per-kWh amount, which is why cutting usage 10% rarely cuts the total 10%.

Rate plans change which habits move the total

• Flat rate: the same price all hours.
• Tiered rate: a lower price up to a threshold, and a higher price above it.
• Time-of-use rate: higher in late-afternoon and early-evening peak hours, and lower overnight.

On a flat plan, the hour does not change the price. Check your bill or rate sheet for the plan name.

Taxes, fees, and small riders add up

Taxes and surcharges or riders set by regulators or law vary by state and utility. Read them once so a new line later stands out, and check a new fee against your utility's notice.

Why a bill suddenly jumps: a short checklist

Work through these in order:

• Compare kWh with the same month last year, not just last month.
• Check whether the reading was estimated rather than actual. An actual reading after estimates can lump catch-up usage into one bill.
• Count billing days and look for a rate-change notice.
• Think about what changed at home, such as a new appliance, guests, a heater left running, or a water heater or pump working harder.
• Check for a tier crossing on a tiered plan.

What to check, and what to ask, before you pay a surprising bill

If kWh looks wrong, compare the bill's meter reading with your own meter if safely reachable, and ask whether the reading was estimated.

If a charge name is unfamiliar, ask what it covers and when it started.

If paying is a strain, ask the utility about payment plans and energy assistance. The federal Low Income Home Energy Assistance Program (LIHEAP) is run through states, territories, and Tribal organizations, and eligibility, benefit amounts, and application windows vary by location, so check your state program office for current rules.

Share account numbers or meter photos only with the utility or an official assistance office.

Keep one habit: each month note kWh used, per-kWh rates, and any fixed charge, and compare kWh with the same month last year. That three-line record turns the next surprising bill from a shock into a question you can already half-answer.