"Optimal Three-Phase Power Flow: Modeling of Photovoltaic Plants" is a technical book that addresses the challenges and solutions in the field of energy production from renewable sources, particularly photovoltaics. Given the increasing energy demand and global warming, it is crucial to develop effective strategies for reducing greenhouse gas emissions. This book provides a comprehensive analysis of the existing problems in energy distribution and proposes innovative approaches for integrating photovoltaic systems into the existing power grid. It is aimed at professionals and students who wish to gain a deeper understanding of the modeling and optimization of three-phase power flows in electrical networks. The author, Malinwo Estone Ayikpa, brings her expertise in the analysis of unbalanced electrical networks and offers valuable insights into the future development of energy supply.