| Value | Category |
|---|---|
| 1 | Alcohol/ethanol |
| 2 | Gasoline/diesel |
| 3 | Kerosene/paraffin |
| 4 | Coal/lignite |
| 5 | Charcoal |
| 6 | Wood |
| 7 | Straw/shrubs/grass |
| 8 | Agricultural crop/crop waste |
| 9 | Animal dung |
| 10 | Processed biomass (pellets) or woodchips |
| 11 | Garbage/plastic |
| 12 | Sawdust |
| 96 | Other |