Cost to run a External USB SSD
A External USB SSD (Storage) draws roughly 1 W at idle and up to 4 W under load. Run 24/7 at a typical ~2 W and the US average of $0.17/kWh, it uses about 18 kWh a year and costs roughly $2.98/year ($0.25/month). In higher-priced regions such as Germany (€0.40/kWh) the same device costs about €7.01/year. Adjust the calculator for your own draw and electricity price.
Source: HomelabWatts wattage database. Data as of 2026-06-13.
Bus-powered USB SSD used for fast scratch or boot storage.
Idle vs load running cost
| Scenario | Power | Energy / year | Cost / year (US) |
|---|---|---|---|
| Idle | 1 W | 9 kWh | $1.49 |
| Typical 24/7 | 2 W | 18 kWh | $2.98 |
| Full load | 4 W | 35 kWh | $5.96 |
Whole-device draw over USB. Negligible compared with spinning drives. Source: HomelabWatts wattage database, data as of 2026-06-13.
Cost by region (typical 24/7 draw)
| Region | Price/kWh | Cost / month | Cost / year |
|---|---|---|---|
| United States (avg residential) | $0.17 | $0.25 | $2.98 |
| Germany | €0.40 | €0.58 | €7.01 |
| France | €0.28 | €0.41 | €4.91 |
| United Kingdom | £0.25 | £0.36 | £4.38 |
| Spain | €0.25 | €0.36 | €4.38 |
Prices from electricity price presets (EIA / Eurostat), data as of 2026-06-01. Excludes standing charges and taxes.
Frequently asked questions
How much does it cost to run a External USB SSD per year?
At a typical 24/7 draw of about 2 W and the US average of $0.17/kWh, roughly $2.98 per year ($0.25/month). At €0.40/kWh in Germany it is about €7.01. Use the calculator above for your own price.
How many watts does a External USB SSD use?
Approximately 1 W at idle and up to 4 W under load. Whole-device draw over USB. Negligible compared with spinning drives.
Are these figures measured or estimated?
Estimated. They are compiled from manufacturer specifications and community wall-meter measurements; your exact draw depends on configuration, firmware and attached storage. Measure at the wall for a precise figure.
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Last updated: 2026-06-13