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

About $45.41 a month, assuming 3,500 kWh a year at 15.57¢/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?

Montana has the 19th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $636 a year.

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Cost to run an electric water heater in Montana (August 2026 rates)

At 15.57¢ per kilowatt-hour — Montana's average residential price in August 2026 — running an electric water heater costs $545 a year. That is 14% less than the national average of $636. Montana's residential rate is up 9.0% from August 2025, which moves this appliance from $500 to $545 a year.

Per day: $1.49
Per month: $45.41
Per year: $545

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 Montana compares

Montana pays 15.57¢/kWh, the 19th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $90.65 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 Nevada and $1,651 in Hawaii, so where you live changes this bill by $1,206 a year.

State	Rate	Per month	Per year
South Dakota	15.15¢	$44.19	$530
Kansas	15.47¢	$45.12	$541
Montana	15.57¢	$45.41	$545
South Carolina	15.76¢	$45.97	$552
Georgia	15.90¢	$46.38	$556

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

What else costs about the same in Montana

Electric car$592 a year in MT Hot tub$389 a year in MT Central air conditioner$366 a year in MT

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 Montana?: About $45.41 a month, assuming 3,500 kWh a year at 15.57¢/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?: Montana has the 19th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $636 a year.