Cost to Run a Grow Light in Montana
Montana's average residential electricity rate is 14.7¢/kWh as of May 2026 — the 13th cheapest in the country, 20% below the U.S. average. At typical usage (14 hours/day), a grow light here costs $18.77 per month.
Per hour
4.4¢
at 100–650 W
Per day
$0.62
14 hours/day
Per month
$18.77
128 kWh
Per year
$225
1,533 kWh
By usage level in Montana
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (7 hrs/day) | $0.31 | $9.38 | $113 |
| Typical (14 hrs/day) | $0.62 | $18.77 | $225 |
| Heavy (24 hrs/day) | $1.23 | $37.54 | $451 |
Montana vs. the rest of the country
Monthly cost at typical usage.
Frequently asked questions
How much does it cost to run a grow light in Montana?
At Montana's current average residential rate of 14.7¢/kWh (May 2026), a grow light with typical usage costs about $0.62 per day, $18.77 per month, or $225 per year.
Is running a grow light in Montana more expensive than average?
No — it's cheaper. Montana's rate is about 20% below the U.S. average: $18.77 per month here versus $23.49 nationally.
What does electricity cost in Montana right now?
Montana residents pay an average of 14.7¢ per kWh as of May 2026 — the 13th cheapest rate of the 51 U.S. jurisdictions we track.