The book covers energy storage systems bioenergy and hydrogen economy, grid integration of renewable energy systems, distributed generation, economic analysis, and environmental impacts of renewable energy systems. The overall approach are interdisciplinary and comprehensive covering economic, environmental, and grid integration issues as well as the physical and engineering aspects. Core issues discussed include mechanical, electrical, and thermal energy storage systems, batteries, fuel cells, biomass and biofuels, hydrogen economy, distributed generation, a brief presentation of microgrids, and in-depth discussions of economic analysis and methods of renewable energy systems, environmental impacts, life-cycle analysis, and energy conservation issues. With several solved examples, holistic material presentation, in-depth subject matter discussions and self-content material presentation, this textbook will appeal strongly to students and professional and nonprofessional readers who wish to understand this fascinating subject. Readers are encouraged to solve the problems and questions, which are useful ways to understand and apply the concepts and the topics included. Introduces key concepts of analysis, design and modeling methods of energy storage systems grid integration of renewable energy systems, microgrids are hybrid power systems, Presents the most common applications of energy storage systems batteries, fuel cells, biomass and biofuel production, and hydrogen economy, Introduces a comprehensive discussion of the most used economic analysis methods applied to energy systems, Presents in a comprehensive manner the environmental issues of renewable energy conversion systems, Includes several solved examples and end-of-chapter questions and problems, helping readers to understand the theory and concepts Book jacket.