Cost to Run a Grow Light in Montana
Montana's average residential electricity rate is 15¢/kWh as of July 2026 — the 15th cheapest in the country, 18% below the U.S. average. At typical usage (14 hours/day), a grow light here costs $19.15 per month.
Per hour
4.5¢
at 100–650 W
Per day
$0.63
14 hours/day
Per month
$19.15
128 kWh
Per year
$230
1,533 kWh
By usage level in Montana
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (7 hrs/day) | $0.32 | $9.58 | $115 |
| Typical (14 hrs/day) | $0.63 | $19.15 | $230 |
| Heavy (24 hrs/day) | $1.26 | $38.30 | $460 |
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 15¢/kWh (July 2026), a grow light with typical usage costs about $0.63 per day, $19.15 per month, or $230 per year.
Is running a grow light in Montana more expensive than average?
No — it's cheaper. Montana's rate is about 18% below the U.S. average: $19.15 per month here versus $23.37 nationally.
What does electricity cost in Montana right now?
Montana residents pay an average of 15¢ per kWh as of July 2026 — the 15th cheapest rate of the 51 U.S. jurisdictions we track.