Lenovo 21U2: $2 a year to run
This model (Computers) uses 11 kWh of electricity a year, which costs about $2 a year and $23 over 10 years at 21.0¢/kWh.
Energy use
11 kWh
per year
Running cost per year
$2
21.0¢/kWh
Running cost over 10 years
$23
Efficiency rank
375 / 1,748
Product details
| Type | Notebook |
|---|---|
| Battery capacity (Wh) | 64.0 |
| Available since | July 24, 2025 |
Compared with the average model (Computers), this one saves about $3 a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| Acer N25WB11 | 11 | $2 |
| Apple A3427 | 11 | $2 |
| DELL Dell Pro Precision 5 16S PW516260 | 11 | $2 |
| DELL Latitude 7450 2-in-1 | 11 | $2 |
| dynabook WLM10* | 11 | $2 |
| Framework FRAPPG0000 | 11 | $2 |
| ASUS S5652M | 11 | $2 |
| ASUS M1605U | 11 | $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