Lenovo 21S6: $3 a year to run
This model (Computers) uses 13 kWh of electricity a year, which costs about $3 a year and $27 over 10 years at 21.0¢/kWh.
Energy use
13 kWh
per year
Running cost per year
$3
21.0¢/kWh
Running cost over 10 years
$27
Efficiency rank
621 / 1,748
Product details
| Type | Notebook |
|---|---|
| Battery capacity (Wh) | 57.0 |
| Available since | May 20, 2025 |
Compared with the average model (Computers), this one saves about $2 a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| Acer AG15-44P | 13 | $3 |
| Acer AG15-43P | 13 | $3 |
| ASUS B5405CVA | 13 | $3 |
| ASUS X515K | 13 | $3 |
| ASUS UX5304V | 13 | $3 |
| CHUWI CWI656 | 13 | $3 |
| DELL Dell Pro 14 Premium PA14260 | 13 | $3 |
| DELL XPS 13 9350 | 13 | $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