Cost to Run a Grow Light in California
California's average residential electricity rate is 33.6¢/kWh as of July 2026 — the 50th cheapest in the country, 84% above the U.S. average. At typical usage (14 hours/day), a grow light here costs $42.90 per month.
Per hour
$0.10
at 100–650 W
Per day
$1.41
14 hours/day
Per month
$42.90
128 kWh
Per year
$515
1,533 kWh
By usage level in California
| Usage | Per day | Per month | Per year |
|---|---|---|---|
| Light (7 hrs/day) | $0.71 | $21.45 | $258 |
| Typical (14 hrs/day) | $1.41 | $42.90 | $515 |
| Heavy (24 hrs/day) | $2.82 | $85.80 | $1,030 |
California 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 California?
At California's current average residential rate of 33.6¢/kWh (July 2026), a grow light with typical usage costs about $1.41 per day, $42.90 per month, or $515 per year.
Is running a grow light in California more expensive than average?
Yes. California's electricity costs about 84% more than the U.S. average, so the same usage costs $42.90 per month here versus $23.37 nationally.
What does electricity cost in California right now?
California residents pay an average of 33.6¢ per kWh as of July 2026 — the 50th cheapest rate of the 51 U.S. jurisdictions we track.