Lenovo 21X2: $3 a year to run
This model (Computers) uses 15 kWh of electricity a year, which costs about $3 a year and $31 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
$31
Efficiency rank
841 / 1,748
Product details
| Type | Notebook |
|---|---|
| Battery capacity (Wh) | 57.0 |
| Available since | May 12, 2026 |
Compared with the average model (Computers), this one saves about $2 a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| Ace T830 | 15 | $3 |
| Acer TMP414-56 | 15 | $3 |
| Acer SFSP14-I51T | 15 | $3 |
| Acer A14-A71M | 15 | $3 |
| ASUS FX610U | 15 | $3 |
| Jp. ik JPLT204-0* | 15 | $3 |
| Acer TMP214-44 | 15 | $3 |
| DELL Dell Pro 7 13 P713265 | 15 | $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