Microgrids are electric power grids composed of loads and distributed energy resources which provide electricity to villages, university campuses and other entities usually smaller than cities which are capable of operating independently from the larger grid if necessary. Such systems are gaining importance in times of rising shares of renewable power and desire for energy resilience. There is a need for an updated work and overview describing the latest technology in microgrids and also adding perspectives of economics, environment and energy policies, including microgrids for cold regions, and future trends. The aim of this work is to give this complete overview of the latest technology around the world, and the interrelation with clean energy systems. Topics covered include key concepts and definitions; microgrid communication and control; storage systems for microgrids; microgrid reliability; clean generation in microgrids; country case studies; economics and policies. The book is essential reading for researchers and practicing engineers, as well as advanced students.