- SIJ Acroni
- SIJ Metal Ravne
- Henkel Maribor
- Šoštanj Thermal Power Plant
- Brestanica Thermal Power Plant
- Dravske elektrarne Maribor
- City Municipality of Velenje
- Municipality of Šoštanj
- City Municipality of Novo Mesto
- Municipality of Jesenice
- Municipality of Mozirje
- Municipality Kanal ob Soči
- Elektro Slovenija
- Petrol Energetika
- Gorenje
- Hydro power plants on the lower Sava River
- Nikola Tesla Thermal Power Plant, Obrenovac
- Elektriprivreda Črne Gore
- Elektro Ljubljana
- Elektro Gorenjska
- Elektro Maribor
- Komunala Novo mesto
- Komunalno podjetje Velenje
- Comet
- Niko Železniki
- IEI Institute for Ecological Engineering
- Slovenian technological platform for waters
- Jožef Štefan Institute – Department for Environmental Sciences, Department for Inorganic Chemistry and Technology, and Centre of Excellence for Environmental Technologies
- Jožef Štefan Institute, Office for Transfer of Technologies
- Elektro Celje
- Institute for Physical Biology
- Institute for Metals and Technology
- Javor Pivka
- Central waste water treatment plant Domžale – Kamnik
- National Institute of Chemistry
- Krka, Novo mesto
- Limnos d.o.o., Company for Applied Ecology
- Ljubljanske mlekarne
- International Post-Graduate School of the Jožef Štefan Institute
- MPI Reciklaža
- National Institute of Biology
- Paloma
- Perutnina Ptuj
- Politehnika Nova Gorica
- Raci
- Radeče papir
- Salonit Anhovo
- TAB – IPM Mežica
- University of Ljubljana, Biotechnical Faculty, Department of Food Science
- Department for Microbiology and Department for Agronomy – Centre for Pedology and Environmental protection
- University of Ljubljana, Faculty of Civil and Geodetic Engineering, Institute for Hydraulic Engineering
- University of Ljubljana, Faculty of Chemistry and Chemical Technology
- University of Maribor, Faculty of Mechanical Engineering
- GDES – District Energy Cluster of Slovenia
