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

About $15.73 a month, assuming 200 W, 8 hours a day, 250 days a year at 47.18¢/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?

Hawaii has the most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $72.64 a year.

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Cost to run a desktop computer in Hawaii (August 2026 rates)

At 47.18¢ per kilowatt-hour — Hawaii's average residential price in August 2026 — running a desktop computer costs $189 a year. That is 160% more than the national average of $72.64. Hawaii's residential rate is up 22.5% from August 2025, which moves this appliance from $154 to $189 a year.

Per hour: 9.4¢
Per day of use: 75.5¢
Per month: $15.73
Per year: $189

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 Hawaii compares

Hawaii pays 47.18¢/kWh, the most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $116 more a year than the typical U.S. household pays for the same use. Running the same desktop computer costs $50.88 a year in Nevada and $189 in Hawaii, so where you live changes this bill by $138 a year.

State	Rate	Per month	Per year
Alaska	29.41¢	$9.80	$118
California	29.75¢	$9.92	$119
Massachusetts	30.48¢	$10.16	$122
Maine	32.11¢	$10.70	$128
Hawaii	47.18¢	$15.73	$189

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

What else costs about the same in Hawaii

Refrigerator$189 a year in HI Air purifier$207 a year in HI Electric oven$157 a year in HI

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 Hawaii?: About $15.73 a month, assuming 200 W, 8 hours a day, 250 days a year at 47.18¢/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?: Hawaii has the most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $72.64 a year.