The book contains selected and peer-reviewed papers presented during the ?International Workshop on Renewable Energy and Storage Devices for Sustainable Development? (IWRESD-2021). The book covers recent research on various applications and scientific developments in the areas of renewable energy. These topics are solar cells, sustainable energy conversion, processing technologies, instrumentation, energy storage devices, solar thermal applications, batteries, new materials, and processes to develop low-cost renewable energy-based technologies, etc. This book will be of interest to researchers and engineers across a variety of fields.