6. Other operating costs
| in PLN thousand | For the year ended 31 December 2017 | For the year ended 31 December 2016 |
| Loss on sale of property, plant and equipment | - | (67) |
| Impairment loss on inventory and receivables | - | (432) |
| Provision for recultivation of ash storages | (2 853) | - |
| Imparment loss of assets held for sale | (740) | (2 922) |
| Write off of fixed assets under construction | - | (586) |
| Donations | (495) | (495) |
| Maintenance expenses of ESP Młoty | (835) | (38) |
| Costs of leased assets | (507) | (261) |
| Other | (584) | (507) |
| (6 014) | (5 308) |
