How much does an electric water heater cost per month in Illinois?

About $58.01 a month, assuming 3,500 kWh a year at 19.89¢/kWh.

How many kilowatt-hours does an electric water heater use?

Roughly 3,500 kWh a year under these assumptions.

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 $642 a year.

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Cost to run an electric water heater in Illinois (June 2026 rates)

At 19.89¢ per kilowatt-hour — Illinois's average residential price in June 2026 — running an electric water heater costs $696 a year. That is 8% more than the national average of $642. Illinois's residential rate is up 8.7% from June 2025, which moves this appliance from $640 to $696 a year.

Per day: $1.91
Per month: $58.01
Per year: $696

Assumption: 3,500 kWh a year. A 50-gallon resistance tank for a household of three or four. This is typically the largest or second-largest electric load in a home without electric heat. 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 $54.25 more a year than the typical U.S. household pays for the same use. Running the same electric water heater costs $459 a year in Nevada and $1,845 in Hawaii, so where you live changes this bill by $1,386 a year.

State	Rate	Per month	Per year
Delaware	19.29¢	$56.26	$675
Wisconsin	19.56¢	$57.05	$685
Illinois	19.89¢	$58.01	$696
Pennsylvania	21.73¢	$63.38	$761
Maryland	21.84¢	$63.70	$764

States ranked by average residential price, cheapest first. See all 51 states for an electric water heater.

What else costs about the same in Illinois

Electric car$756 a year in IL Hot tub$497 a year in IL Central air conditioner$468 a year in IL

Cutting the number down

A heat-pump water heater does the same job for roughly a third of the electricity, which is why it usually pays back faster than any other upgrade in the house.
Dropping the setpoint from 140 F to 120 F cuts standby losses and scalding risk at once.
An insulating blanket on an older tank pays for itself in a season; check the manufacturer's guidance first.

Questions

How much does an electric water heater cost per month in Illinois?: About $58.01 a month, assuming 3,500 kWh a year at 19.89¢/kWh.
How many kilowatt-hours does an electric water heater use?: Roughly 3,500 kWh a year under these assumptions.
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 $642 a year.