The main aim of this book is to provide a state of the art of the Levelized Cost of Energy calculation for energy communities from both a theoretical, defining a systematic analysis approach, and a practical point of view, providing results for three representative real case studies. The book is structured in four clear chapters which cover everything from the fundamentals of power system configuration and the LCOE concept, to the definition of the aggregated system LCOE and its impact on electricity markets and energy policies. It presents case studies, within multiple examples for energy generation and storage, making it a brief but well-rounded review. The book will be useful for researchers and academics in energy economics, power systems and energy policies, for energy policy makers and students.