How much does an incandescent bulb cost per month in Montana?

About $1.42 a month, assuming 60 W, 5 hours a day, 365 days a year at 15.57¢/kWh.

How many kilowatt-hours does an incandescent bulb use?

Roughly 110 kWh a year under these assumptions, or 0.06 kWh for every hour it runs.

Is that expensive compared with other states?

Montana has the 19th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $19.89 a year.

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Cost to run an incandescent bulb in Montana (August 2026 rates)

At 15.57¢ per kilowatt-hour — Montana's average residential price in August 2026 — running an incandescent bulb costs $17.05 a year. That is 14% less than the national average of $19.89. Montana's residential rate is up 9.0% from August 2025, which moves this appliance from $15.65 to $17.05 a year.

Per hour: 0.9¢
Per day of use: 4.7¢
Per month: $1.42
Per year: $17.05

Assumption: 60 W, 5 hours a day, 365 days a year — 110 kWh a year. A 60 W bulb producing roughly the same 800 lumens as a 9 W LED. Use the calculator to swap in the numbers from your own model.

How Montana compares

Montana pays 15.57¢/kWh, the 19th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $2.84 less a year than the typical U.S. household pays for the same use. Running the same incandescent bulb costs $13.93 a year in Nevada and $51.66 in Hawaii, so where you live changes this bill by $37.73 a year.

State	Rate	Per month	Per year
South Dakota	15.15¢	$1.38	$16.59
Kansas	15.47¢	$1.41	$16.94
Montana	15.57¢	$1.42	$17.05
South Carolina	15.76¢	$1.44	$17.26
Georgia	15.90¢	$1.45	$17.41

States ranked by average residential price, cheapest first. See all 51 states for an incandescent bulb.

What else costs about the same in Montana

Microwave$17.05 a year in MT Electric kettle$17.05 a year in MT Box fan$17.52 a year in MT

Cutting the number down

The comparison is the point: identical light, nearly seven times the electricity, for the whole life of the bulb.
Replacing the handful of bulbs that burn the most hours captures most of the available saving immediately.

Questions

How much does an incandescent bulb cost per month in Montana?: About $1.42 a month, assuming 60 W, 5 hours a day, 365 days a year at 15.57¢/kWh.
How many kilowatt-hours does an incandescent bulb use?: Roughly 110 kWh a year under these assumptions, or 0.06 kWh for every hour it runs.
Is that expensive compared with other states?: Montana has the 19th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $19.89 a year.