A profound understanding of the physical laws underlying energy converters is a prerequisite for a sustainable use of our energy resources. The aim of this textbook is to provide a unified view on the different energy conversion processes ranging from power plants to solar cells. It offers an interdisciplinary introduction to energy sciences for senior undergraduate and graduate students from natural sciences and engineering. The central theme is the treatment of energy converters as open thermodynamical systems and the performance of efficiency analyses, based on the concept of exergy. About the Authors Katharina Krischer is a professor of physics at the Technische Universitat Munchen, Germany. She has taught lectures on energy sciences for undergraduate and graduate students for more than 10 years. Her research topics include the photo-electrochemical production of solar fuels. Konrad Schonleber is a researcher in the group of Prof. Krischer which he joined after graduating in physics from the Technische Universitat Munchen. His research interest focuses on light-driven semiconductor electrochemistry and its application for renewable energies.