How to Read Your Electricity Bill (and Cut It)

The one unit that matters: the kilowatt-hour (kWh)

Electricity is sold by the kilowatt-hour (kWh) — the energy a 1,000-watt appliance uses in one hour. A 100-watt bulb left on for 10 hours uses 1 kWh; a 1,500-watt space heater burns through 1 kWh in just 40 minutes. Your bill's total is essentially kWh used × your rate, plus fixed charges and taxes. Everything else is detail.

The parts of a typical bill

• Supply (or generation) charge — the electricity itself, priced per kWh.
• Delivery (or distribution) charge — the cost of moving it to your home, often also per kWh.
• Fixed / customer / service charge — a flat monthly fee you pay no matter how little you use.
• Taxes, fees, and riders — local surcharges layered on top.

In deregulated markets, supply and delivery come from two different companies; regulated utilities bundle them. Either way, add up every per-kWh line to know what a unit truly costs you.

Find your true price per kWh

The rate printed on your plan is rarely the whole story. To find what you actually pay, divide the bill's total by the kWh used:

Example: a $180 bill for 900 kWh works out to 20¢/kWh — even if your "energy rate" is listed as 11¢, because delivery, fixed charges, and taxes are all baked in. Use that real number in our cost-per-kWh calculator to price any appliance accurately.

What actually drives your bill

In most homes a handful of large loads dominate. Heating and cooling usually top the list, followed by the water heater, then anything else that makes heat — the dryer, the oven, and EV charging.

*Varies widely with climate, usage, and household size.

Notice the pattern: the biggest costs come from devices that either run for long hours or make heat. That is where the savings live.

Seven ways to cut the total

1. Attack heating and cooling first. Each 1 °F of setback trims roughly 1–3% off that load; a smart thermostat pays for itself quickly.
2. Turn the water heater down to 120 °F and insulate the tank and the first few feet of pipe.
3. Shift heavy loads to off-peak hours — dryer, dishwasher, and EV charging — if you're on a time-of-use plan.
4. Swap any remaining incandescent or halogen bulbs for LEDs — an 85%+ cut on that wattage.
5. Kill standby draw with switched power strips on entertainment centers and idle electronics.
6. Wash in cold and air-dry when you can — the dryer is one of the thirstiest appliances in the house.
7. Shop your plan. In deregulated areas, switching the supply rate alone can save 10–30%.

Price any appliance in seconds

Want to know what a specific device costs to run? Drop its wattage, hours per day, and your real price per kWh into the Energy Cost Calculator for daily, monthly, and yearly figures. If you only know the appliance's amperage, convert it first with our Amps to Watts calculator.

Common Questions

Why is my electricity bill so high?

Almost always because of long-running or heat-producing loads — air conditioning, electric heat, the water heater, or EV charging — combined with a higher-than-expected real price per kWh once delivery and fixed charges are counted. Calculate your true rate first, then find your biggest load.

What uses the most electricity in a home?

Heating and cooling typically account for the largest share, followed by water heating and, in EV households, vehicle charging. Lighting and electronics are usually minor by comparison.

Is my "rate" the same as what I pay per kWh?

No. The advertised energy rate excludes delivery charges, fixed fees, and taxes. Divide your total bill by the kWh used to get the number that actually matters.