A router and modem left on continuously draw 5–20 watts. Though modest individually, 24/7 operation means this small load runs up significant cost over months and years.
| Basis | Cost |
|---|---|
| Per hour (while running, 15 W typical) | $0.003 |
| Per day (24 h/day, 7/7 days) | $0.068 |
| Per month | $2.06 |
| Per year | $24.76 |
| Hourly range (small 10 W – large 25 W) | $0.002 – $0.005 |
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