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How Much Does It Cost to Run a Desktop Computer in South Carolina?
The short answer
Running a 150W desktop computer in South Carolina costs about $0.02 an hour. At 8 hours a day, that’s roughly $5.65 a month and $67.76 a year.
South Carolina’s average residential rate was 15.5¢ per kWh in July 2026 (EIA), 16% below the US average.
Source: U.S. EIA, July 2026 data · Updated
Desktop Computer cost by daily use in South Carolina
| Daily use | kWh/month | Per day | Per month | Per year |
|---|---|---|---|---|
| 1 hour/day | 4.6 | $0.02 | $0.71 | $8.47 |
| 2 hours/day | 9.1 | $0.05 | $1.41 | $16.94 |
| 4 hours/day | 18.3 | $0.09 | $2.82 | $33.88 |
| 8 hours/day | 36.5 | $0.19 | $5.65 | $67.76 |
| 12 hours/day | 54.8 | $0.28 | $8.47 | $102 |
| 24 hours/day | 109.5 | $0.56 | $16.94 | $203 |
South Carolina vs other states
At typical use, a desktop computer costs $67.76 a year in South Carolina — $142 less than in Hawaii and $12.05 more than in Louisiana.
South Carolina has the 20th-cheapest residential electricity of the 50 states and DC. South Carolina electricity rates · all states ranked
Electricity price trend in South Carolina
15.5¢/kWh in July 2026 — ▲ +5.2% from a year earlier.
How to lower the cost of running a desktop computer
Everyday desktop use — browsing, documents, video calls — is light work for a modern PC, so most office desktops plus a monitor draw around 100–200W. Workstations rendering video or running heavy software use more. Sleep mode drops consumption to just a few watts, so letting the computer sleep when you step away makes a real difference over a year.
- Set the computer to sleep after 15–30 minutes and the display after 5–10 minutes.
- Turn off the whole setup with a power strip at the end of the day.
- Lower monitor brightness — it often accounts for a big share of the total.
Questions
Frequently asked questions
How much does it cost to run a desktop computer for 24 hours in South Carolina?
Running a 150W desktop computer for 24 hours uses about 3.60 kWh, which costs about $0.56 at South Carolina’s average rate of 15.5¢/kWh.
How many kWh does a desktop computer use per month?
At 8 hours a day, a typical desktop computer uses about 36.5 kWh a month. In South Carolina that costs $5.65.
Is it expensive to run a desktop computer in South Carolina?
South Carolina has the 20th-cheapest residential electricity of the 50 states and DC at 15.5¢/kWh — cheaper than most. Running a desktop computer here costs about $67.76 a year at typical use, compared with $80.20 at the national average rate.
What is the electricity rate in South Carolina right now?
The average residential electricity rate in South Carolina was 15.5¢ per kWh in July 2026, according to the latest EIA data — up 5.2% from a year earlier.
Desktop Computer costs in nearby states
Other appliances in South Carolina
Cheapest and priciest states
Comparisons
Sources & method
- Electricity rates: U.S. Energy Information Administration, Electric Power Monthly — average residential retail price, July 2026 (latest available). Retrieved .
- CO₂: EIA State Electricity Profiles, 2024 emissions rate of in-state power generation.
- Default usage for desktop computer: 8 hours a day. Typical power 150W.
- Formulas, duty cycles and limitations: methodology. Data download: open data (CC BY 4.0).