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How Much Does It Cost to Run a Desktop Computer in Illinois?
The short answer
A typical 150W desktop computer costs about $0.03 per hour to run in Illinois, or $7.02 a month at 8 hours a day.
The estimate uses Illinois’s average residential electricity price of 19.2¢/kWh from EIA (July 2026) — 5% above the national average.
Source: U.S. EIA, July 2026 data · Updated
Desktop Computer cost by daily use in Illinois
| Daily use | kWh/month | Per day | Per month | Per year |
|---|---|---|---|---|
| 1 hour/day | 4.6 | $0.03 | $0.88 | $10.52 |
| 2 hours/day | 9.1 | $0.06 | $1.75 | $21.05 |
| 4 hours/day | 18.3 | $0.12 | $3.51 | $42.09 |
| 8 hours/day | 36.5 | $0.23 | $7.02 | $84.18 |
| 12 hours/day | 54.8 | $0.35 | $10.52 | $126 |
| 24 hours/day | 109.5 | $0.69 | $21.05 | $253 |
Illinois vs other states
At typical use, a desktop computer costs $84.18 a year in Illinois — $126 less than in Hawaii and $28.47 more than in Louisiana.
Illinois has the 17th-most-expensive residential electricity of the 50 states and DC. electricity prices in Illinois · all states ranked
Electricity price trend in Illinois
19.2¢/kWh in July 2026 — ▲ +11.6% 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 Illinois?
Running a 150W desktop computer for 24 hours uses about 3.60 kWh, which costs about $0.69 at Illinois’s average rate of 19.2¢/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 Illinois that costs $7.02.
Is it expensive to run a desktop computer in Illinois?
Illinois has the 17th-most-expensive residential electricity of the 50 states and DC at 19.2¢/kWh — pricier than most. Running a desktop computer here costs about $84.18 a year at typical use, compared with $80.20 at the national average rate.
What is the electricity rate in Illinois right now?
The average residential electricity rate in Illinois was 19.2¢ per kWh in July 2026, according to the latest EIA data — up 11.6% from a year earlier.
Desktop Computer costs in nearby states
Other appliances in Illinois
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).