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

About $1.75 a month, assuming 60 W, 5 hours a day, 365 days a year at 19.22¢/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?

Illinois has the 17th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $20.05 a year.

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Cost to run an incandescent bulb in Illinois (July 2026 rates)

At 19.22¢ per kilowatt-hour — Illinois's average residential price in July 2026 — running an incandescent bulb costs $21.05 a year. That is 5% more than the national average of $20.05. Illinois's residential rate is up 11.6% from July 2025, which moves this appliance from $18.86 to $21.05 a year.

Per hour: 1.2¢
Per day of use: 5.8¢
Per month: $1.75
Per year: $21.05

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 Illinois compares

Illinois pays 19.22¢/kWh, the 17th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to 99.6¢ more a year than the typical U.S. household pays for the same use. Running the same incandescent bulb costs $13.93 a year in Louisiana and $52.56 in Hawaii, so where you live changes this bill by $38.63 a year.

State	Rate	Per month	Per year
Delaware	18.48¢	$1.69	$20.24
Wisconsin	19.06¢	$1.74	$20.87
Illinois	19.22¢	$1.75	$21.05
Ohio	19.45¢	$1.77	$21.30
Maryland	21.41¢	$1.95	$23.44

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

What else costs about the same in Illinois

Microwave$21.05 a year in IL Electric kettle$21.05 a year in IL Box fan$21.62 a year in IL

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 Illinois?: About $1.75 a month, assuming 60 W, 5 hours a day, 365 days a year at 19.22¢/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?: Illinois has the 17th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $20.05 a year.