The sun provides solar energy which is clean and environmentally friendly and can be directly used to produce thermal as well as electrical power. It is also directly the main source of all renewable energy sources discussed in this book. Due to global industrialization and the sharp increase of CO2, there is an increasing need to develop less polluting renewable energy sources for our long term survival and to balance the ecological system. This book is a unique and complete book covering renewable energy resources and contains a detailed analysis of energy and exergy, CO2 mitigation, and CO2 credit of various renewable energy sources. It is an ideal reference for teaching renewable energy to engineering and science students, as well as a reference book for scientists and professionals doing self study on the subject.This book is an ideal reference text for teaching renewable energy to engineering and science students, as well as a reference book for scientists and professionals doing self study on the subject. The book has twelve chapters and starts with the definition and classification of renewable and non renewable energy and their status at global level. This chapter also contains the basic heat transfer mechanisms and laws of thermodynamics. It then deals with availability of solar radiation at different latitudes and energy and exergy analysis of flat plate collector, solar air collector, solar concentrator, evacuated tube collector, solar water heating system, solar distillation and solar cooker. The following chapter discusses the basics of semiconductor, its characteristics, working, characteristics of solar cell in dark and daylight situation, fundamentals of characteristic curves of semiconductor, fundamentals of PV module and array and some PVT systems. Detailed discussion on biomass, bio-fuels and biogas and their applications and the power produced by them, namely bio-power, is covered in the following chapters. Other renewable energy sources like hylCv