Electric companies calculate your energy use by reading the meter attached to your property, subtracting the previous reading from the current one to get the kilowatt-hours (kWh) you consumed during the billing cycle, and then applying your rate structure to that number before adding fixed service charges, delivery fees, and taxes. The U.S. residential average sits at about 17.45 cents per kWh as of early 2026, but what lands on your bill depends on how your utility prices each kWh and what non-energy charges it tacks on.1U.S. Energy Information Administration. Electric Power Monthly – Table 5.03
What the Meter Is Counting
A watt measures how fast electricity is being used at a given instant. A kilowatt is 1,000 watts. A kilowatt-hour is one kilowatt drawn for one hour, and it is the unit utilities bill you in.2U.S. Energy Information Administration. Measuring Electricity Run a 1,000-watt appliance for an hour and you have used one kWh. Burn a 100-watt bulb for ten hours and you have used the same one kWh.
That distinction is why two homes with the same appliances can post very different bills. The meter does not care what you own. It records how much power actually flowed, for how long.
How the Meter Reports Your Usage
The meter mounted where the utility’s wires reach your property is the single source of truth for billing. Everything else on the bill is arithmetic performed on its reading.
Older Electromechanical Meters
Traditional meters use a spinning aluminum disk whose speed tracks your power draw, with clock-like dials tallying total kWh. A technician visits the property, reads the dials, and the difference from the previous reading is your usage for that period.
Smart Meters
Most utilities have replaced spinning-disk meters with digital smart meters, part of what the industry calls Advanced Metering Infrastructure. These record usage in short intervals, often 15 minutes, and transmit the readings wirelessly, so no one needs to visit the property. The granular data is what makes time-of-use pricing workable and lets the utility see outages almost as they happen. Many states let customers opt out of smart meters, but opting out usually comes with a one-time setup fee and a recurring monthly charge to pay for manual reads.
Estimated Reads
When the utility can’t get an actual reading — a locked gate, a blocked meter, a hardware fault — it estimates the bill based on your usage during the same period in prior years. Most state regulators cap how long this can continue. Under common frameworks, the utility must take an actual reading at least every two to three months. Once a real reading comes in, the next bill is adjusted to reconcile any gap between the estimates and reality.
How the Monthly Bill Comes Together
At the end of a billing cycle, which typically runs about 30 days, the utility takes the current meter reading and subtracts the previous one. The result is your kWh for the period. That number gets multiplied by whatever per-kWh price your rate plan calls for, which produces the energy portion of the bill. The utility then adds the fixed and variable charges that do not depend on how many kWh you used, applies taxes, and prints a total.
The piece most people assume is simple — the price per kWh — is often the piece that varies the most.
Rate Structures That Change the Price per kWh
Two neighbors can use identical kWh in a month and owe different amounts because their utilities price electricity differently. How your rate is structured is one of the few parts of the bill you can actually plan around.
Flat Rates
The simplest structure charges the same price per kWh no matter how much you use or when. Use 900 kWh at 14 cents and you owe $126 for energy. Flat rates are easy to predict and are becoming less common as utilities move to pricing that reflects when and how much power is being drawn.
Tiered Rates
Under a tiered structure, sometimes called an inverted block rate, your first chunk of kWh each month is priced at the lowest tier. Cross a threshold and every additional kWh costs more. A utility might charge 30 cents per kWh for the first 384 kWh and 40 cents for everything above. Some utilities set the thresholds against a baseline allowance that varies by region and season, so the exact breakpoints can shift during the year.
Time-of-Use Rates
Time-of-use (TOU) rates charge more during peak grid hours and less off-peak. A common split sets on-peak at weekday late afternoon through evening, often 5 p.m. to 9 p.m., with off-peak covering all other hours, weekends, and holidays. On-peak rates can run two to three times the off-peak price. Shifting heavy loads like dishwashers or EV charging to off-peak hours lowers the bill without reducing total consumption.
Fixed-Rate and Variable-Rate Plans
In deregulated states, you may be able to choose between a fixed-rate plan that locks your per-kWh price for the length of the contract and a variable-rate plan that moves with wholesale market conditions. Fixed plans give you bill stability but may charge an early cancellation fee. Variable plans let you switch providers freely, but the rate can spike during heat waves or cold snaps. Some variable plans advertise a low introductory rate that jumps after a month or two, so the contract terms matter.
The Charges That Aren’t About kWh
Energy consumption is only part of the bill. Several additional line items appear every month, and together they can account for 30% to 50% of what you owe. That is why comparing plans only on the advertised per-kWh rate can mislead you.
- Customer or service charge: A flat monthly fee, usually $5 to $20, that covers your account, meter, and connection regardless of usage.
- Transmission charges: Regulated by the Federal Energy Regulatory Commission, these pay for moving power from generating plants to local distribution systems over high-voltage lines.
- Distribution charges: The cost of the “last mile,” including poles, wires, and transformers between the local substation and your home.
- Fuel or energy adjustment charges: A rider that moves your rate up or down based on changes in the utility’s actual fuel costs since rates were last set.
- Taxes and public benefit charges: State and local taxes plus surcharges that fund low-income assistance, efficiency rebates, or renewable energy mandates.
Demand Charges
Some plans, historically commercial and industrial but increasingly on residential bills, add a demand charge based on the single highest point of power draw during the billing period, measured in kilowatts rather than kilowatt-hours. If a business pulls 45 kW during one 15-minute window when the HVAC and kitchen fire up together, that peak sets the demand charge for the whole month, even if the rest of the month is quiet. Staggering heavy equipment startups is the most direct way to lower it.
When Your Meter Runs Both Ways
If you have rooftop solar or a small wind turbine, the meter counts energy flowing in both directions. When your system produces more than the home is using, the excess exports to the grid and the utility credits you for it. At the end of the cycle, the utility calculates net consumption: total drawn minus total exported. A positive number means you owe for the difference; a negative number becomes a credit carried forward. The export credit rate varies by program. Some credit at the full retail rate, others at a lower avoided-cost or wholesale rate.
Checking the Math on Your Bill
Revenue meters in the United States have to meet accuracy standards set by the American National Standards Institute. The current governing document, ANSI C12.1-2026, defines what counts as acceptable accuracy for new and in-service billing meters.3ANSI. ANSI C12.1-2026 – Code for Electricity Metering Meters are grouped into accuracy classes of 0.1, 0.2, and 0.5, meaning the meter must read within ±0.1%, ±0.2%, or ±0.5% of the true value at full load.4ANSI. ANSI C12.20-2015 – Electricity Meters – 0.1, 0.2, and 0.5 Accuracy Classes A 0.5% meter on a 1,000 kWh month can be off by at most 5 kWh. If a meter drifts outside its class, the utility generally has to recalibrate or replace it.
You have the right to request a meter accuracy test. The specifics vary by state, but the pattern is consistent. You ask the utility to test the meter. If it hasn’t been tested in the past 12 months, the first test is usually free. For more frequent requests, the utility can require a deposit, often $50 to $100, to cover its cost. If the test shows the meter running fast beyond the allowable tolerance, the deposit comes back and the utility typically issues a billing credit for the period the meter was inaccurate. If the meter tests within tolerance, the utility keeps the deposit. In most places you can also hire an independent testing facility at your own expense, and the utility must accommodate that.
If you have worked through the utility’s own complaint process and still think the bill is wrong, every state has a public utility commission or public service commission that oversees billing practices. These agencies can order refunds, require meter replacements, and penalize utilities that don’t follow the rules.