Lenovo 21LK: $2 a year to run
This model (Computers) uses 9 kWh of electricity a year, which costs about $2 a year and $19 over 10 years at 21.0¢/kWh.
Energy use
9 kWh
per year
Running cost per year
$2
21.0¢/kWh
Running cost over 10 years
$19
Efficiency rank
173 / 1,748
Product details
| Type | Notebook |
|---|---|
| Battery capacity (Wh) | 42.0 |
| Available since | April 19, 2024 |
Compared with the average model (Computers), this one saves about $3 a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| Acer TMX215-51 | 9 | $2 |
| Acer A315-24P | 9 | $2 |
| Apple A3241 | 9 | $2 |
| Apple A3112 | 9 | $2 |
| ASUS CM1402CM2 | 9 | $2 |
| DELL CC11260 2-in-1 | 9 | $2 |
| DELL Latitude 3140 2-in-1 | 9 | $2 |
| dynabook PAC10* | 9 | $2 |
- 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