This book aims to detail the optimal power flow (OPF) analysis. The mathematical formulation of OPF analysis has been presented considering the current operational issues such as pollutant emission and fuel restriction. The analysis has been carried out in standard test systems under static and dynamic environments. Ant lion optimiser is a modern optimisation tool that has been implemented for performing static and dynamic OPF analyses. This book is highly suitable for researchers and post graduate students who are performing researches in the field of power flow analysis, multi-objective optimisation and meta-heuristic algorithms.