Conference of Environmental and Climate Technologies CONECT 2015 has been envisaged as a regular scientific forum bringing together researchers, policy makers and industry professionals. The main aim was to acquaint researchers with achievements in the area of energy systems and environmental engineering and to give scientists, PhD students and professionals an opportunity to present and publish the results of their research. The conference topics were: Biotechonomy and circular economy Resource and waste management Advanced energy and environmental technologies Renewable energy Energy efficiency improvement Heat and power generation & systems Energy management, policy and economics Integration of system approach in energy and environmental sector. Two stage blind peer reviewed papers of the conference presentations are gathered in this volume of Energy Procedia.