German Sustainable Building Council - (DGNB) - http://www.dgnb.de/

World Green Building Council - (WorldGBC) - http://www.worldgbc.org/

Austrian Green Building Council - (ÖGNI) - http://www.ogni.at 

Sustainable Energy Europe - http://www.sustenergy.org

Build Up - http://www.buildup.eu

Bulgarian Photovoltaic Association - http://www.bpva.org

Technical University of Sofia - http://www.tu-sofia.bg

University of Architecture, Civil Engineering and Geodesy - http://www.uacg.bg

National Association of the Bulgarian European Clubs - http://ec.europa.eu/bulgaria/youth/nabec/index_en.htm