Introduction to Renewable Energy is increasingly becoming important to resolve climate change, energy security and equitable growth. 2.7 million tons of CO2 have been saved through its use and about 16% of global final energy consumption presently comes from renewable resources. It is instrumental in providing economical and clean energy through the deployment of a wide range of technologies, e.g. improved cookware, solar lanterns, solar home systems, etc. Many Introduction to Renewable Energy projects are large-scale, renewable technologies suited to rural and remote areas of developing countries. This textbook on Introduction to Renewable Energy, meant for undergraduate and postgraduate students, provides a brief introduction which takes a look at the transition to Introduction to Renewable Energy economy and salient features. The 23 chapters included in this book study the solar thermal power, photovoltaic power, global view of solar energy, scenario in USA, Spain, Germany and China. It takes global overview of wind power, development of bio-energy in all its gamut and developments. It takes a look at the prospects of Introduction to Renewable Energy in different fields. Though intended as a textbook, it should be equally useful for engineers, general readers and all others involved in planning and administration of energy.