Renewable energy refers to the energy that is naturally replenished with time. Some of the sources of renewable energy include sunlight, wind, tides, rain, etc. Adoption of renewable energy has resulted in increased energy security, climate change mitigation and economic benefits. The availability of energy is a major driver of human development. Renewable energy helps in facilitating this even in rural and remote areas of the world. Research is being done to develop newer and better energy sources like algal fuel or algal-derived biomass and artificial photosynthesis for energy storage using nanotechnology. This book presents the important theories and concepts that are central to the development of the technologies of renewable energy production. It further elucidates the cutting-edge technological innovations of recent years that have revolutionized this field. Students and researchers will benefit alike from an in-depth study of this book.