Cost to Run a Electric Water Heater in Idaho
Idaho's average residential electricity rate is 12.4¢/kWh as of May 2026 — the 1st cheapest in the country, 33% below the U.S. average. At typical usage (2.9 hours/day), a electric water heater here costs $49.19 per month.
Per hour
$0.56
at 3,500–5,500 W
Per day
$1.62
2.9 hours/day
Per month
$49.19
397 kWh
Per year
$591
4,763 kWh
By usage level in Idaho
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (1.45 hrs/day) | $0.81 | $24.60 | $295 |
| Typical (2.9 hrs/day) | $1.62 | $49.19 | $591 |
| Heavy (5.8 hrs/day) | $3.24 | $98.39 | $1,181 |
Idaho vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a electric water heater in Idaho?
At Idaho's current average residential rate of 12.4¢/kWh (May 2026), a electric water heater with typical usage costs about $1.62 per day, $49.19 per month, or $591 per year.
Is running a electric water heater in Idaho more expensive than average?
No — it's cheaper. Idaho's rate is about 33% below the U.S. average: $49.19 per month here versus $73.00 nationally.
What does electricity cost in Idaho right now?
Idaho residents pay an average of 12.4¢ per kWh as of May 2026 — the 1st cheapest rate of the 51 U.S. jurisdictions we track.