The purpose of this book is to provide a broad range of modeling, design, and issues related to waste to energy systems with an innovative approach while providing significant content for designers, students, and practitioners. In the concepts of waste-to-energy, seeking to study waste stream, energy flows, new equipment, and develop a common understanding of the framework of international harmonized definitions, tools, innovative solutions and guidelines for consumers and manufacturing industries to support the concept of waste-to-energy in power plants. The waste to energy is an idea into a practical reality in the energy market. The task was to look for integrated design solutions that measure different conditions. In order to gain a clear view of the state of waste incineration with useful energy consumption, current views and techniques from the past to the future are reviewed and evaluated. In this regard, in all separate chapters, we examine the content dimensions of this issue. In this way, thermal and environmental assessments of waste to energy power plants have been considered. Also, energy concepts associated with municipal solid wastes have been presented.