How much does a string of Christmas lights cost per month in Illinois?

About 10.8¢ a month, assuming 25 W, 6 hours a day, 45 days a year at 19.22¢/kWh.

How many kilowatt-hours does a string of Christmas lights use?

Roughly 7 kWh a year under these assumptions, or 0.03 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 $1.24 a year.

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Cost to run a string of Christmas lights in Illinois (July 2026 rates)

At 19.22¢ per kilowatt-hour — Illinois's average residential price in July 2026 — running a string of Christmas lights costs $1.30 a year. That is 5% more than the national average of $1.24. Illinois's residential rate is up 11.6% from July 2025, which moves this appliance from $1.16 to $1.30 a year.

Per hour: 0.5¢
Per day of use: 2.9¢
Per month: 10.8¢
Per year: $1.30

Assumption: 25 W, 6 hours a day, 45 days a year — 7 kWh a year. Per 100-count LED string. A 100-count incandescent string draws roughly 40 W, and older C9 bulbs far more. 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 6.1¢ more a year than the typical U.S. household pays for the same use. Running the same string of Christmas lights costs 85.9¢ a year in Louisiana and $3.24 in Hawaii, so where you live changes this bill by $2.38 a year.

State	Rate	Per month	Per year
Delaware	18.48¢	10.4¢	$1.25
Wisconsin	19.06¢	10.7¢	$1.29
Illinois	19.22¢	10.8¢	$1.30
Ohio	19.45¢	10.9¢	$1.31
Maryland	21.41¢	12.0¢	$1.45

States ranked by average residential price, cheapest first. See all 51 states for a string of Christmas lights.

What else costs about the same in Illinois

Led bulb$3.16 a year in IL Clothes iron$3.17 a year in IL Smart speaker$5.05 a year in IL

Cutting the number down

A timer that runs the display six hours instead of twelve halves the season's cost with nobody noticing.
Incandescent strings are where holiday bills come from; LED strings of the same length are a fraction of the draw.

Questions

How much does a string of Christmas lights cost per month in Illinois?: About 10.8¢ a month, assuming 25 W, 6 hours a day, 45 days a year at 19.22¢/kWh.
How many kilowatt-hours does a string of Christmas lights use?: Roughly 7 kWh a year under these assumptions, or 0.03 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 $1.24 a year.