How much does an electric water heater cost per month in Oklahoma?

About $41.85 a month, assuming 3,500 kWh a year at 14.35¢/kWh.

How many kilowatt-hours does an electric water heater use?

Roughly 3,500 kWh a year under these assumptions.

Is that expensive compared with other states?

Oklahoma has the 10th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $641 a year.

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Cost to run an electric water heater in Oklahoma (July 2026 rates)

At 14.35¢ per kilowatt-hour — Oklahoma's average residential price in July 2026 — running an electric water heater costs $502 a year. That is 22% less than the national average of $641. Oklahoma's residential rate is up 6.1% from July 2025, which moves this appliance from $473 to $502 a year.

Per day: $1.38
Per month: $41.85
Per year: $502

Assumption: 3,500 kWh a year. A 50-gallon resistance tank for a household of three or four. This is typically the largest or second-largest electric load in a home without electric heat. Use the calculator to swap in the numbers from your own model.

Related calculators: work out whether a heat-pump water heater pays back.

How Oklahoma compares

Oklahoma pays 14.35¢/kWh, the 10th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $139 less a year than the typical U.S. household pays for the same use. Running the same electric water heater costs $445 a year in Louisiana and $1,680 in Hawaii, so where you live changes this bill by $1,235 a year.

State	Rate	Per month	Per year
Kentucky	13.81¢	$40.28	$483
Arkansas	14.33¢	$41.80	$502
Oklahoma	14.35¢	$41.85	$502
Wyoming	14.36¢	$41.88	$503
Mississippi	14.54¢	$42.41	$509

States ranked by average residential price, cheapest first. See all 51 states for an electric water heater.

What else costs about the same in Oklahoma

Electric car$545 a year in OK Hot tub$359 a year in OK Central air conditioner$338 a year in OK

Cutting the number down

A heat-pump water heater does the same job for roughly a third of the electricity, which is why it usually pays back faster than any other upgrade in the house.
Dropping the setpoint from 140 F to 120 F cuts standby losses and scalding risk at once.
An insulating blanket on an older tank pays for itself in a season; check the manufacturer's guidance first.

Questions

How much does an electric water heater cost per month in Oklahoma?: About $41.85 a month, assuming 3,500 kWh a year at 14.35¢/kWh.
How many kilowatt-hours does an electric water heater use?: Roughly 3,500 kWh a year under these assumptions.
Is that expensive compared with other states?: Oklahoma has the 10th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $641 a year.