6. Other operating costs

in PLN thousand	For the year ended 31 December 2018	For the year ended 31 December 2017 (transformed data)
Provision for recultivation of ash storages	(3 132)	(2 853)
Donations	(495)	(495)
Maintenance expenses of ESP Młoty	(164)	(835)
Costs of leased assets	(27)	-
Other	(173)	(378)
	(3 991)	(4 561)