What Is a kWh? Texas Electricity Units Explained

One kilowatt running for one hour. That's it. Here's what that looks like in your house and why it's the only number that matters on your bill.

By Han Hwang Published April 21, 2026 2 min read

The definition

A kilowatt-hour (kWh) is the amount of electricity you use when you run a 1,000-watt appliance for one hour. Every Texas electricity bill is denominated in kWh, and every plan is priced per kWh.

Watt = instantaneous power. Kilowatt-hour = power over time. Bills measure time because that's what you pay for — how much you used and how long you used it.

What a kWh gets you

Running specific things for specific amounts of time uses 1 kWh:

A 1,500W AC unit for about 40 minutes
A 100W lightbulb for 10 hours
A modern refrigerator for about 8 hours
A gaming PC for about 2.5 hours
A clothes dryer for one load (roughly)
Charging an electric car for ~4 miles of range

How many kWh does a Texas home use?

Average Texas household: about 1,200 kWh a month. But the variance is huge.

Apartment / small home, mild month: 500-700 kWh
Average home, summer: 1,500-2,000 kWh
Large house, Texas August with AC: 3,000+ kWh

Your bill will tell you your 12-month history. If you're new to a home, ask the previous tenant or your provider — they have a "historical usage report" you can request.

Why the "advertised rate" trick works

The advertised rate is the plan's average at exactly 1,000 kWh — and bill credits are engineered to land at exactly that number, making the effective rate look low. The problem: real homes swing. Use 900 kWh in a mild month and the credit vanishes; the low advertised number was never your number.

If a plan's advertised rate is 9.9¢ at exactly 1,000 kWh but 17.6¢ at 900, and your months swing between 800 and 1,400 kWh, you're paying the higher rate most of the year. The advertised rate told you a true thing — just not the true thing that matters for your home.

The one trick to remember

When comparing plans, use your own recent kWh from your last few bills. If you don't have that, start at 1,000 — then check the plan's 500 kWh column on the EFL to see what a miss costs. Plans that stay flat across 500, 1,000, and 2,000 kWh are usually good plans. Plans that only win at exactly 1,000 kWh are usually bill-credit traps.

The Bottom Line

One kilowatt running for one hour. That's it. Here's what that looks like in your house and why it's the only number that matters on your bill.

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Han Hwang

Consumer Advocate

Han turns industry jargon into plain English. He breaks down confusing rate structures, explains how to read an EFL, and identifies which plans actually save money versus those that just look cheap upfront. EFLs, TDU charges, tiered rates — if it's confusing, he makes it make sense.

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Sources

U.S. Energy Information Administration (EIA) — Texas residential consumption

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