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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 renewable energy projects are large-scale, renewable technologies suited to rural and remote areas of developing countries. This textbook on Renewable Energy, meant for undergraduate and postgraduate students, provides a brief introduction which takes a look at the transition to renewable energy economy and salient features. The 25 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 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. Brief Contents: Part-IA–Overview of Solar Energy: Science and Technology of Solar Thermal Power • Science and Technology of Photovoltaic (PV) Power. Part-IB–Global Perspectives on Solar Energy: Solar Energy to Global Overview • Survey of Solar Power in USA, Spain, Germany and China. Part-IC–Development of Solar Power in India: Solar Power in India Today • Jawaharlal Nehru National Solar Mission (JNNSM) • National R & D Programme in Solar Energy • Major Solar Companies of India. Part-II–Wind Power: History of Wind Power Through the Ages • Global Overview of Wind Power • Technology of Wind Energy and Associated Turbo-power Systems • Indian Wind Power Development • World Wind Power Development (USA, China, European Union, Canada, Australia and South Africa). Part-III–Bioenergy: Growth of Plant Biomass, Biomass Structure and Forestry • An Overview of Bioenergy Fuels • Biogas—Producer Gas and Anaerobic Gas • Bioethanol: Biochemical Processes • Biodiesel: Transesterification of Vegetable Oils • Development of Bioenergy in India • World Bioenergy Scenario (Brazil, China and USA). Part-IV–Futuristic Renewable Energies: Renewable Energy to Motive Power: Sterling Engine • Hydrogen Energy and Fuel Cell Technology • Ocean Thermal Energy Conversion (OTEC) • Ocean Wave Energy and Tidal Energy.