Lenovo 21SX: $3 a year to run
This model (Computers) uses 15 kWh of electricity a year, which costs about $3 a year and $30 over 10 years at 21.0¢/kWh.
Energy use
15 kWh
per year
Running cost per year
$3
21.0¢/kWh
Running cost over 10 years
$30
Efficiency rank
824 / 1,748
Product details
| Type | Notebook |
|---|---|
| Battery capacity (Wh) | 64.0 |
| Available since | April 17, 2025 |
Compared with the average model (Computers), this one saves about $2 a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| ASUS UX5406A | 14 | $3 |
| DELL PV14255 | 14 | $3 |
| DELL DC14255 | 14 | $3 |
| DELL Latitude 5350 | 14 | $3 |
| DELL MC14250 | 14 | $3 |
| Lenovo 21U6 | 14 | $3 |
| Lenovo Lenovo V14 G5 IRL | 14 | $3 |
| Lenovo 21SE | 14 | $3 |
- Refrigerators
- Freezers
- Washing machines
- Dishwashers
- Tumble dryers
- Room air conditioners
- Dehumidifiers
- Water heaters
- Electric cooktops and ranges
- Televisions
- Air purifiers
Source: ENERGY STAR (U.S. EPA) · 21.0¢/kWh (August 2026) · Methodology