Project manager Marcin Hołub, prof. of ZUT, was taking part in the 5th International Congress on Energy Efficiency and Energy Related Materials” which was held on October 22-28, 2019 in Oludeniz, Fethiye / Mugla-TURKEY. He presented STEP project results on this multi-national event with a paper titled: “Energy efficiency of small waste water treatment plants in the Baltic Sea region – a comparative case study” which compares energy efficiency indexes of WWTP of project partners. Paper will be available for download on our project website after the congress revision process is completed.