How much does an LED bulb cost per month in Washington?

About 20.1¢ a month, assuming 9 W, 5 hours a day, 365 days a year at 14.71¢/kWh.

How many kilowatt-hours does an LED bulb use?

Roughly 16 kWh a year under these assumptions, or 0.01 kWh for every hour it runs.

Is that expensive compared with other states?

Washington has the 13th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $3.01 a year.

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Cost to run an LED bulb in Washington (July 2026 rates)

At 14.71¢ per kilowatt-hour — Washington's average residential price in July 2026 — running an LED bulb costs $2.42 a year. That is 20% less than the national average of $3.01. Washington's residential rate is up 9.4% from July 2025, which moves this appliance from $2.21 to $2.42 a year.

Per hour: 0.1¢
Per day of use: 0.7¢
Per month: 20.1¢
Per year: $2.42

Assumption: 9 W, 5 hours a day, 365 days a year — 16 kWh a year. A 9 W LED producing about 800 lumens, the equivalent of an old 60 W incandescent. Use the calculator to swap in the numbers from your own model.

How Washington compares

Washington pays 14.71¢/kWh, the 13th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to 59.1¢ less a year than the typical U.S. household pays for the same use. Running the same LED bulb costs $2.09 a year in Louisiana and $7.88 in Hawaii, so where you live changes this bill by $5.79 a year.

State	Rate	Per month	Per year
Wyoming	14.36¢	19.7¢	$2.36
Mississippi	14.54¢	19.9¢	$2.39
Washington	14.71¢	20.1¢	$2.42
Montana	14.99¢	20.5¢	$2.46
Florida	15.03¢	20.6¢	$2.47

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

What else costs about the same in Washington

Clothes iron$2.43 a year in WA String of christmas lights99.3¢ a year in WA Smart speaker$3.87 a year in WA

Cutting the number down

Per bulb the cost is trivial; a house has 40 of them, and that is the number that matters.
Dimming an LED does cut power draw, though not perfectly in proportion to the light output.

Questions

How much does an LED bulb cost per month in Washington?: About 20.1¢ a month, assuming 9 W, 5 hours a day, 365 days a year at 14.71¢/kWh.
How many kilowatt-hours does an LED bulb use?: Roughly 16 kWh a year under these assumptions, or 0.01 kWh for every hour it runs.
Is that expensive compared with other states?: Washington has the 13th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $3.01 a year.