The book begins with an exploration of energy itself and the classification of energy sources, providing a foundational understanding necessary to appreciate the complexities of sustainable energy dynamics. This is followed by an in-depth analysis of renewables, from solar and wind to biomass and biofuels, detailing their potentials, technology advancements, and practical applications in modern society. 

Each technology is examined critically, considering both its advantages and challenges, including biomass characterization and its associated technologies such as briquetting, combustion, gasification, and pyrolysis. The discussions extend into vital considerations for biogas technology and the selection of construction materials for biogas plants, all while emphasizing the critical role of biofuels in achieving energy security and reducing greenhouse gas emissions.

Furthermore, this book addresses the unique applications of renewable energy technologies, including solar photovoltaics, solar water heaters, hydro energy conversion systems, and wind power generation—each presented with principles essential for understanding their operation and application. Special focus is given to energy conservation in agriculture, highlighting the significance of efficiency in this vital sector.

1. Energy
2. Classification of Energy Sources
3. Harnessing the Sun, Wind, and Earth: The Rise of Renewable Energy
4. Introduction to Renewable Energy Sources
5. Renewable Energy-Potentials and Achievements
6. Characterization of Biomass
7. Biomass Briquetting– A Value Adding Technology for Agro Residues
8. Biomass Combustion Technology
9. Biomass Gasification Technology
10. Removal of Tar and Other Impurities in Biomass Gasification
11. Biomass Pyrolysis Technology
12. Biogas Technology
13. Biogas Plants: Types and Technologies
14. Selection of Construction Materials Used in Biogas Plants
15. Biofuels and their Characteristics
16. Biodiesel: Overview
17. Biodiesel Production: A Comprehensive Overview
18. Bio-Ethanol Production Flowchart and Applications in the Transport Sector
19. Biofuels: Importance, demand, and growth in the transport sector
20. Basics of Solar Photovoltaics
21. Recent Trends in Solar Drying: Solar Tunnel Dryer
22. Solar Driers: Principles and Types
23. Solar PV Systems: Principles and Water Pumping Applications
24. Solar Water Heater: Principles and Applications
25. Hydro Energy Conversion System
26. Wind Energy: Principles and Applications
27. Wind Power Generation: Principles and Applications
28. Energy Conservation in Agriculture: Overview and Significance