2. Revenue from sale

in PLN thousand	For the year ended 31 December 2018	For the year ended 31 December 2017 (transformed data)
Revenues from the sale of finished goods	574 671	581 961
Revenue from sale of electricity	180 265	175 269
Revenue from sale of heat	364 124	374 590
Revenue from energy origin certificates	15 199	18 564
Revenue from sale of heat distribution services	8 898	8 293
Revenue from rental of investment property	4 053	3 728
Other revenue from sale of products	2 132	1 517
Revenues from the sale of merchandise and raw materials	666	692
Other revenue from sale of merchandise and raw materials	666	692
	575 337	582 653