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

About 27.2¢ a month, assuming 9 W, 5 hours a day, 365 days a year at 19.89¢/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?

Illinois has the 16th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $3.01 a year.

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Cost to run an LED bulb in Illinois (June 2026 rates)

At 19.89¢ per kilowatt-hour — Illinois's average residential price in June 2026 — running an LED bulb costs $3.27 a year. That is 8% more than the national average of $3.01. Illinois's residential rate is up 8.7% from June 2025, which moves this appliance from $3.00 to $3.27 a year.

Per hour: 0.2¢
Per day of use: 0.9¢
Per month: 27.2¢
Per year: $3.27

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 Illinois compares

Illinois pays 19.89¢/kWh, the 16th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to 25.5¢ more a year than the typical U.S. household pays for the same use. Running the same LED bulb costs $2.15 a year in Nevada and $8.66 in Hawaii, so where you live changes this bill by $6.51 a year.

State	Rate	Per month	Per year
Delaware	19.29¢	26.4¢	$3.17
Wisconsin	19.56¢	26.8¢	$3.21
Illinois	19.89¢	27.2¢	$3.27
Pennsylvania	21.73¢	29.7¢	$3.57
Maryland	21.84¢	29.9¢	$3.59

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

What else costs about the same in Illinois

Clothes iron$3.28 a year in IL String of christmas lights$1.34 a year in IL Smart speaker$5.23 a year in IL

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 Illinois?: About 27.2¢ a month, assuming 9 W, 5 hours a day, 365 days a year at 19.89¢/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?: Illinois has the 16th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $3.01 a year.