How much does a desktop computer cost per month in Washington?

About $4.90 a month, assuming 200 W, 8 hours a day, 250 days a year at 14.71¢/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?

Washington has the 13th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $73.24 a year.

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Cost to run a desktop computer in Washington (July 2026 rates)

At 14.71¢ per kilowatt-hour — Washington's average residential price in July 2026 — running a desktop computer costs $58.84 a year. That is 20% less than the national average of $73.24. Washington's residential rate is up 9.4% from July 2025, which moves this appliance from $53.80 to $58.84 a year.

Per hour: 2.9¢
Per day of use: 23.5¢
Per month: $4.90
Per year: $58.84

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 Washington compares

Washington pays 14.71¢/kWh, the 13th 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 $50.88 a year in Louisiana and $192 in Hawaii, so where you live changes this bill by $141 a year.

State	Rate	Per month	Per year
Wyoming	14.36¢	$4.79	$57.44
Mississippi	14.54¢	$4.85	$58.16
Washington	14.71¢	$4.90	$58.84
Montana	14.99¢	$5.00	$59.96
Florida	15.03¢	$5.01	$60.12

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

What else costs about the same in Washington

Refrigerator$58.84 a year in WA Air purifier$64.43 a year in WA Electric oven$48.95 a year in WA

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 Washington?: About $4.90 a month, assuming 200 W, 8 hours a day, 250 days a year at 14.71¢/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?: Washington has the 13th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $73.24 a year.