What makes a regular electric grid a "smart" grid? It comes down to digital technologies that enable two-way communication between a utility and its customers, as opposed to the traditional electric grid, where power flows in one direction. Based on statistics and available research, smart grids globally attract the largest investment venues in smart cities. Smart grids and city buildings that are connected in smart cities contribute to significant financial savings and improve the economy. The smart grid has many components, including controls, computers, automation, and new technologies and equipment working together. These technologies cooperate with the electrical grid to respond digitally to our quickly changing electric demand. The investment in smart grid technology also has certain challenges. The interconnected feature of smart grid is valuable, but it tremendously increases their susceptibility to threats. It is crucial to secure smart grids wherein many technologies are employed to increase real-time situational awareness and the ability to support renewables, as well as system automation to increase the reliability, efficiency, and safety of the electric grid. This exciting new volume covers all of these technologies, including the basic concepts and the problems and solutions involved with the practical applications in the real world. Whether for the veteran engineer or scientist, the student, or a manager or other technician working in the field, this volume is a must-have for any library.