Lenovo 21U6: $3 a year to run
This model (Computers) uses 14 kWh of electricity a year, which costs about $3 a year and $30 over 10 years at 21.0¢/kWh.
Energy use
14 kWh
per year
Running cost per year
$3
21.0¢/kWh
Running cost over 10 years
$30
Efficiency rank
813 / 1,748
Product details
| Type | Notebook |
|---|---|
| Battery capacity (Wh) | 45.0 |
| Available since | July 24, 2026 |
Compared with the average model (Computers), this one saves about $2 a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| ASUS CX9406CAA | 14 | $3 |
| ASUS PM5406CGA | 14 | $3 |
| ASUS BM1503CDA | 14 | $3 |
| ASUS UX5406S | 14 | $3 |
| dynabook PDA50* | 14 | $3 |
| Framework FRANPJ0000 | 14 | $3 |
| HP 16-ct | 14 | $3 |
| HP 16-bz | 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