By the year 2030, the International Energy Agency (IEA) forecasts a 50% growth in global primary energy consumption. The strongest increases are expected in developing countries, but industrialized nations will also continue to raise their energy demand. Among the various forms of energy, nuclear power plays a crucial role in securing energy supply worldwide. The demand for well-trained professionals in energy and systems engineering is on the rise, with interdisciplinary knowledge becoming increasingly important. This book provides a comprehensive overview of the topic, even for readers without prior knowledge. In addition to promising reactor concepts such as high-temperature and fusion reactors, it also covers the operation of the two power reactors currently in operation in Germany.