Cost to Run a Incandescent Bulb in Idaho
Idaho's average residential electricity rate is 13.7¢/kWh as of July 2026 — the 5th cheapest in the country, 25% below the U.S. average. At typical usage (5 hours/day), a incandescent bulb here costs $1.25 per month.
Per hour
0.8¢
at 40–100 W
Per day
4.1¢
5 hours/day
Per month
$1.25
9.1 kWh
Per year
$15.00
110 kWh
By usage level in Idaho
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (2.5 hrs/day) | 2.1¢ | $0.62 | $7.50 |
| Typical (5 hrs/day) | 4.1¢ | $1.25 | $15.00 |
| Heavy (10 hrs/day) | 8.2¢ | $2.50 | $30.00 |
Idaho vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a incandescent bulb in Idaho?
At Idaho's current average residential rate of 13.7¢/kWh (July 2026), a incandescent bulb with typical usage costs about 4.1¢ per day, $1.25 per month, or $15.00 per year.
Is running a incandescent bulb in Idaho more expensive than average?
No — it's cheaper. Idaho's rate is about 25% below the U.S. average: $1.25 per month here versus $1.67 nationally.
What does electricity cost in Idaho right now?
Idaho residents pay an average of 13.7¢ per kWh as of July 2026 — the 5th cheapest rate of the 51 U.S. jurisdictions we track.