| Nace | Description | Number of Company |
|---|---|---|
| 02.10.01 | Growing of coppice woods (including woods for pulpwood and fire) | 13 |
| 02.20.01 | Production of industrial and fire woods (including production of charcoal in the forest using traditional methods) | 20 |
| 05.10.01 | Mining of hard coal | 118 |
| 05.20.01 | Mining of lignite | 83 |
| 06.20.01 | Extraction of natural gas | 7 |
| 08.92.01 | Extraction and picking of turf | 2 |
| 16.29.90 | Manufacture of other wooden products, firewood and pellets for energy (uncarbonized) | 31 |
| 19.10.10 | Manufacture of coke oven products form lignite and turf (including manufacturing of coke and semi-coke coal, belly, coal, tar, pitch and pitch coke etc. products and processing coke coal into pellet) | 8 |
| 19.10.11 | Manufacture of coke oven products form hard coal (including manufacturing of coke and semi-coke coal, belly, coal, tar, pitch and pitch coke etc. products and processing coke coal into pellet) | 1 |
| 19.20.12 | Manufacture of turf, lignite and hard coal briquette (a fuel made by pressing coal dust) | 6 |
