JGERI is an international open-access and free-of-charge journal in the field of green and renewable energies, published quarterly, both printed and electronically, in cooperation with the Renewable Energy Research Institute of Arak University. Articles accepted and published by JGERI are in three formats: research articles, review articles, and applied articles. JGERI is interested in qualified international multidisciplinary research results related to all aspects of green and renewable energy. JGERI accepts manuscripts from the results of scientific achievements in a very wide range of fundamental, engineering, and industrial research in the field of green energy.