Business computersENERGY STAR certified
Lenovo ThinkPad X12 Detachable Gen 2
32 GB notebook computer, model number 21LK.
Memory
32 GB
Processor
Core Ultra 7 164U
Typical electricity use
9.1 kWh/yr
NPU installed
Yes
Of 980 certified notebook business computers, 81 have a lower typical electricity use than the ThinkPad X12 Detachable Gen 2 (9.1 kWh/yr).
Its certified typical electricity use of 9.1 kWh/yr costs about $1.18 a year at 13¢/kWh.
- Maker
- Lenovo
- Model
- ThinkPad X12 Detachable Gen 2
- Model number
- 21LK
- Type
- Notebook
- Processor
- Core Ultra 7 164U
- CPU cores
- 12
- Memory
- 32 GB
- NPU installed
- Yes
- Storage
- SDD
- Screen
- 12.3 in
- Battery
- 42 Wh
- Operating system
- Windows 11 Pro
- Marketed as a workstation
- No
- Typical electricity use
- 9.1 kWh/yr
- Power in sleep
- 0.5 W
- Power at long idle
- 0.5 W
- Power when off
- 0.2 W
- On the market since
- Apr 2024
- ENERGY STAR certified
- 30 Jul 2025
Certified under the same record
The maker lists these as the same machine or a variant of it: 21LL.
Source: ENERGY STAR certified business computers dataset, US EPA, record 4480867, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the ThinkPad X12 Detachable Gen 2
Certified business computers from other makers, same color class, within 20% of its speed.
| Model | Type | Processor | Memory | Typical electricity use |
|---|---|---|---|---|
| HP 16-af | Notebook | Core Ultra 7 | 32 GB | 14.2 kWh/yr |
| HP OmniBook 7 Laptop AI ENERGY STAR | Notebook | Intel Ultra 9 285H | 32 GB | 16.4 kWh/yr |
| Acer N25H6*** | Notebook | lntel� Come "Ultra 9 285H | 32 GB | 12.7 kWh/yr |
| LG 15Z80T*-* | Notebook | AMD Ryzen AI7 350W | 32 GB | 14.6 kWh/yr |
| HP Pavilion Aero Laptop 13 ENERGY STAR | Notebook | Ryzen 7 | 32 GB | 11.9 kWh/yr |
| Acer N25H5*** | Notebook | lntel� Come "Ultra 9 285H | 32 GB | 13.4 kWh/yr |
Lenovo
More Lenovo business computers
| Model | Type | Processor | Memory | Typical electricity use |
|---|---|---|---|---|
| Lenovo V15 G7 Q7X | Notebook | C110100 | 16 GB | 8.2 kWh/yr |
| IdeaPad Slim 3 15Q7X11 | Notebook | C110100 | 16 GB | 7.8 kWh/yr |
| IdeaPad Slim 3 14Q7X11 | Notebook | C110100 | 16 GB | 8.2 kWh/yr |
| ThinkCentre M75s Gen 6 | Desktop | Ryzen 7 | 64 GB | 50.5 kWh/yr |
| ThinkCentre M75t Gen 6 | Desktop | Ryzen 7 | 64 GB | 53 kWh/yr |
| Yoga 9 2-in-1 16N1X11 | Notebook | NVIDIA RTX Spark N1X (6144-core GPU, 20-core CPU) | 64 GB | 21.2 kWh/yr |
| ThinkCentre M75q Gen 6 | Desktop | Ryzen 7 | 64 GB | 36 kWh/yr |
| Yoga Pro 9 15N1X11 | Notebook | NVIDIA RTX Spark N1x (6144-core GPU, 20-core CPU) | 128 GB | 23.4 kWh/yr |