The SGSC conference focuses on utilizing new ideas and technologies in the field of smart grid to make our urban environment more sustainable, increasing quality of life and efficiency of urban infrastructure, operation, services, and competitiveness while meeting the needs of present and future generations with respect to economic, social and environmental aspects in smart cities. This year, SGSC 2015 will be collocated with Smart City 360 Summit 2015 at Toronto, Canada, during October 13-16, and dedicated to the role of energy innovations in urban environment, and research and development on sustainable smart city ecosystems. Latest outcome of these enabling technologies will offer new opportunities for policy-makers, research institutes and business to learn, share, and collect experience and best smart grid practices to plan and operate sustainable urban communities. Scientific results, design concepts, new solutions, new smart grid applications, and case studies will be presented.