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

About $39.00 a month, assuming 3,500 kWh a year at 13.37¢/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 5th 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 Idaho (August 2026 rates)

At 13.37¢ per kilowatt-hour — Idaho's average residential price in August 2026 — running an electric water heater costs $468 a year. That is 26% less than the national average of $636. Idaho's residential rate is up 10.7% from August 2025, which moves this appliance from $423 to $468 a year.

Per day: $1.28
Per month: $39.00
Per year: $468

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 Idaho compares

Idaho pays 13.37¢/kWh, the 5th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $168 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
North Dakota	13.31¢	$38.82	$466
Utah	13.31¢	$38.82	$466
Idaho	13.37¢	$39.00	$468
Tennessee	13.42¢	$39.14	$470
Nebraska	13.54¢	$39.49	$474

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$508 a year in ID Hot tub$334 a year in ID Central air conditioner$314 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 $39.00 a month, assuming 3,500 kWh a year at 13.37¢/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 5th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $636 a year.