21. Inventories
| in PLN thousand | As at 31 December 2017 | As at 31 December 2016 |
| Raw materials | 75 556 | 70 189 |
| Prepayments for deliveries | 569 | 512 |
| Energy origin certificates | 23 192 | 29 359 |
| 99 317 | 100 060 |
| in PLN thousand | As at 31 December 2017 | As at 31 December 2016 |
| Raw materials | 75 556 | 70 189 |
| Prepayments for deliveries | 569 | 512 |
| Energy origin certificates | 23 192 | 29 359 |
| 99 317 | 100 060 |
