Lenovo 21Q8: $4 a year to run
This model (Computers) uses 18 kWh of electricity a year, which costs about $4 a year and $37 over 10 years at 21.0¢/kWh.
Energy use
18 kWh
per year
Running cost per year
$4
21.0¢/kWh
Running cost over 10 years
$37
Efficiency rank
1,122 / 1,748
Product details
| Type | Notebook |
|---|---|
| Battery capacity (Wh) | 90.0 |
| Available since | September 25, 2025 |
Compared with the average model (Computers), this one saves about $1 a year.
More efficient alternatives
| Model | kWh/year | Cost/year |
|---|---|---|
| Acer TMP215-55 | 18 | $4 |
| ASUS AM7406CKA | 18 | $4 |
| GETAC S410 | 18 | $4 |
| Lenovo ThinkBook 16 G7 ARP | 18 | $4 |
| Lenovo ThinkBook X G2 IAH | 18 | $4 |
| MSI Prestige 13 AI+ Evo A2VMG | 18 | $4 |
| dynabook PSY28U | 18 | $4 |
| YASHI YP1682 | 18 | $4 |
- 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