This book offers a comprehensive exploration of renewable energy systems, elucidating the fundamental principles underpinning technologies such as solar photovoltaics, wind turbines, and biomass conversion. Features:Discusses the role of computational fluid dynamics simulations in bioenergy production and for thermal solar collectors. Covers geothermal power plant design and performance optimization and solar-assisted heat pump technologies for building applications. Highlights the role of smart technologies such as artificial intelligence in sustainable energy technologies. Presents case studies on renewable energy sources, power demand, policies, and solar thermal desalination technologies. Explains valorization of biomass to fuel briquettes and environmental life cycle analysis of renewable energy. The text is primarily written for senior undergraduates, graduate students, and academic researchers in the fields of environmental engineering, renewable energy, clean technologies, mechanical engineering, electrical engineering, chemical engineering, and civil engineering.