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

About $41.91 a month, assuming 3,500 kWh a year at 14.37¢/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?

Idaho has the 10th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $642 a year.

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Cost to run an electric water heater in Idaho (June 2026 rates)

At 14.37¢ per kilowatt-hour — Idaho's average residential price in June 2026 — running an electric water heater costs $503 a year. That is 22% less than the national average of $642. Idaho's residential rate is up 19.1% from June 2025, which moves this appliance from $422 to $503 a year.

Per day: $1.38
Per month: $41.91
Per year: $503

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.

How Idaho compares

Idaho pays 14.37¢/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 $459 a year in Nevada and $1,845 in Hawaii, so where you live changes this bill by $1,386 a year.

State	Rate	Per month	Per year
Kentucky	14.26¢	$41.59	$499
Oklahoma	14.33¢	$41.80	$502
Idaho	14.37¢	$41.91	$503
North Carolina	14.74¢	$42.99	$516
Mississippi	14.88¢	$43.40	$521

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

What else costs about the same in Idaho

Electric car$546 a year in ID Hot tub$359 a year in ID Central air conditioner$338 a year in ID

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 Idaho?: About $41.91 a month, assuming 3,500 kWh a year at 14.37¢/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?: Idaho has the 10th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $642 a year.