A newly established, huge and an exciting field of optimization algorithm applied in micro-grid and distributed energy resources is being implemented in our book. A growing presence of distributed generation along with micro-grid nowadays is a herculean task for practicing engineers, researchers, academicians. This book is basically targetted for an advanced level of undergraduate curriculum, postgraduate curriculum and for researchers in this directions. We have tried to present the concept of the subject matter in a comprehensive manner offers a lucid explanation theory. This book not only lays strong emphasis on distributed generation but also incorporates some important optimization algorithms for further higher learning. A careful selection of text material enable the students to gradually master the course.