How much does a desktop computer cost per month in North Carolina?

About $4.91 a month, assuming 200 W, 8 hours a day, 250 days a year at 14.74¢/kWh.

How many kilowatt-hours does a desktop computer use?

Roughly 400 kWh a year under these assumptions, or 0.20 kWh for every hour it runs.

Is that expensive compared with other states?

North Carolina has the 11th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $73.36 a year.

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Cost to run a desktop computer in North Carolina (June 2026 rates)

At 14.74¢ per kilowatt-hour — North Carolina's average residential price in June 2026 — running a desktop computer costs $58.96 a year. That is 20% less than the national average of $73.36. North Carolina's residential rate is up 10.2% from June 2025, which moves this appliance from $53.52 to $58.96 a year.

Per hour: 2.9¢
Per day of use: 23.6¢
Per month: $4.91
Per year: $58.96

Assumption: 200 W, 8 hours a day, 250 days a year — 400 kWh a year. An office-class tower plus monitor, doing ordinary work. Use the calculator to swap in the numbers from your own model.

How North Carolina compares

North Carolina pays 14.74¢/kWh, the 11th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $14.40 less a year than the typical U.S. household pays for the same use. Running the same desktop computer costs $52.44 a year in Nevada and $211 in Hawaii, so where you live changes this bill by $158 a year.

State	Rate	Per month	Per year
Oklahoma	14.33¢	$4.78	$57.32
Idaho	14.37¢	$4.79	$57.48
North Carolina	14.74¢	$4.91	$58.96
Mississippi	14.88¢	$4.96	$59.52
Washington	14.91¢	$4.97	$59.64

States ranked by average residential price, cheapest first. See all 51 states for a desktop computer.

What else costs about the same in North Carolina

Refrigerator$58.96 a year in NC Air purifier$64.56 a year in NC Electric oven$49.05 a year in NC

Cutting the number down

Sleep after 15 minutes idle is the default with the largest payoff and the smallest downside.
Screensavers do not save energy; a display running a 3D animation costs more than a blank screen.

Questions

How much does a desktop computer cost per month in North Carolina?: About $4.91 a month, assuming 200 W, 8 hours a day, 250 days a year at 14.74¢/kWh.
How many kilowatt-hours does a desktop computer use?: Roughly 400 kWh a year under these assumptions, or 0.20 kWh for every hour it runs.
Is that expensive compared with other states?: North Carolina has the 11th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $73.36 a year.