Business computersENERGY STAR certified
Lenovo ThinkPad X1 Carbon Gen 12
64 GB notebook computer, model number 21KC.
Memory
64 GB
Processor
Core Ultra 7 165U
Typical electricity use
19.2 kWh/yr
NPU installed
No
Of 980 certified notebook business computers, 895 have a lower typical electricity use than the ThinkPad X1 Carbon Gen 12 (19.2 kWh/yr).
Its certified typical electricity use of 19.2 kWh/yr costs about $2.50 a year at 13¢/kWh.
- Maker
- Lenovo
- Model
- ThinkPad X1 Carbon Gen 12
- Model number
- 21KC
- Type
- Notebook
- Processor
- Core Ultra 7 165U
- CPU cores
- 12
- Memory
- 64 GB
- NPU installed
- No
- Storage
- SDD
- Screen
- 14 in
- Battery
- 55.8 Wh
- Operating system
- Linux, Windows 11 Pro
- Marketed as a workstation
- No
- Typical electricity use
- 19.2 kWh/yr
- Power in sleep
- 0.6 W
- Power at long idle
- 0.6 W
- Power when off
- 0.2 W
- On the market since
- Mar 2024
- ENERGY STAR certified
- 2 Apr 2025
Certified under the same record
The maker lists these as the same machine or a variant of it: ThinkPad X1 Carbon Gen 12 5G, ThinkPad X1 Carbon Gen 12 CAT4, 21KD.
Source: ENERGY STAR certified business computers dataset, US EPA, record 4009047, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the ThinkPad X1 Carbon Gen 12
Certified business computers from other makers, same color class, within 20% of its speed.
| Model | Type | Processor | Memory | Typical electricity use |
|---|---|---|---|---|
| HP HSN-I62C-3 | Notebook | Core Ultra 7 | 64 GB | 10.6 kWh/yr |
| HP HSN-I62C | Notebook | Core Ultra 7 | 64 GB | 11 kWh/yr |
| HP HSN-I62C-6 | Notebook | Core Ultra 9 | 64 GB | 19.8 kWh/yr |
| HP HSN-I62C-4 | Notebook | Core Ultra 9 | 64 GB | 15.6 kWh/yr |
| HP HSN-Q38C-4 | Notebook | Core Ultra 7 | 64 GB | 19.1 kWh/yr |
| HP HSN-Q38C | Notebook | Core Ultra 7 | 64 GB | 19.3 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 |