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Now that it is time to write the preface, I am reminded of Professor J.P. Den Hartog and of my father. My father, many times told me to read prefaces and opening lines by mathematicians he admired, as if those short pieces of writing contained the keys to something he wanted me to see. Den Hartog was more pragmatic, he reminded all authors that a publisher will not take a book without a preface and that it is good to play it safe not to follow the fortunes of Henri Bouasse and Oliver Heaviside, who ignoring the laws of mechanics, known to Sancho Panza, got hit just as hard as they punched in their prefaces by powerful men in starchy shirts. So let us go easy and without hitting anyone, with the starch for energy storage and the windmills for power generation. Life itself is an expression of active energy conversion. But for humans, probably from the moment we learned to manipulate fire, energy conversion has gone well beyond our physiology and has created needs that are embedded in our identity. By now, one hopes, we have come to realize that our future, and that of many other species along ours, depends greatly on how we approach power generation. Energy conversion processes for power generation are balancing acts of creating and exploiting asymmetries; a juggling performance with photons, electrons, and fluid particles to create structured motions and flows that can be harvested. There are multiple pieces to the puzzle of energy conversion and the associated technology adoptions. Some involve economics, other politics, and other psychology. All play important roles. This book is intentionally focused on the scientific underlying principles and technological aspects of renewable energy processes. The book aims to explain how these processes work and in doing so sets up the stage for process improvements and, hopefully, to spark ideas for new, efficient, and renewable energy conversion strategies. The book is based on class notes created in the teaching of “Fundamentals of Energy Processes” at Stanford since 1976 and taught for over three decades. It is written with graduate and senior undergraduate level students in mind from science and engineering. Because of its fundamental approach, we hope it will also serve well those who need to understand the limitations of technical energy solutions, and require a good scientific grasp of what is being proposed. The book is divided into five parts: Heat Engines, The World of Hydrogen, Energy from the Sun, Wind and Water, and Land and Beyond. The first four parts contain enough material to be made into individual courses, however, most chapters in the book are independent and can be selected to meet the needs of a specific course. Depending on the audience, some sections can be safely skipped. For example, for students with a background in solid-state devices, the section on semi-conductors will be trivial. Those with a background in engineering thermodynamics could, after covering kinetic theory, skip some sections of Chapters 2 and 3, although they may benefit from seeing a different approach to the material. Students with a background in organic chemistry could skip sections on the chapter on biomass and those with knowledge of electrochemistry will find that they can go fast on the chapters on fuel cells and hydrogen generation.