Explanatory text that treats the complete fundamentals of energy and current energy resources, technologies developments, solutions to energy issues and new concepts ranging from fossil fuel to solar energy, biomass energy, wind energy, ocean energy, geothermal energy, hydrogen energy, fuel cells, thermo-electric systems, nuclear energy and nanotechnology concepts to generate clean energy. The theoretical aspects of various energy conversion technologies, and design practices in light of national and international perspectives are discussed with educational examples. Every technique is explained in detail and every chapter is concluded with a reference section, recommended reading and a number of questions. Intended for university students with various backgrounds, who are involved in energy science and engineering (chemistry, physics, environmental sciences, earth sciences, petroleum, mining and mechanical engineering). Recommended for professionals seeking an introduction to the subject.