 |
| primary energy: 46 phrases in 18 subjects |
| Diplomacy | 1 |
| Ecology | 3 |
| Electrical engineering | 2 |
| Energy industry | 10 |
| Energy system | 2 |
| Environment | 1 |
| Forestry | 1 |
| Gas processing plants | 1 |
| General | 1 |
| Geology | 2 |
| Metallurgy | 2 |
| Nanotechnology | 1 |
| Natural resourses and wildlife conservation | 1 |
| Nuclear and fusion power | 6 |
| Oil / petroleum | 1 |
| Physics | 2 |
| Programming | 3 |
| Technology | 6 |