What are the energy sources of the future and what technologies can we rely on? These are the questions that show the precarious situation our planet is in. Which is why we need solid answers – for laypeople and the scientifically-minded as well as for politicians and students of the relevant disciplines. The author provides here a compact and comprehensible overview of our future energy resources. Alongside a detailed and richly illustrated introduction to the various technologies, he also discusses the fundamental problem of energy storage. The author is an electrical engineer working as a consultant for a group of inventors in regenerative energies, and reports on the latest research approaches.