Abstract The degraded conventional power grid has required transformation and modernizations depending to increased energy demand. Since the conventional grid is most commonly dependent to fossil-fuel based generation plants, it caused hazardous outcomes such as carbon emission and pollutions deteriorating the environment. Extensive researches and developments have brought a novel grid type called smart grid that allows integrating renewable energy sources (RESs), achieving distributed generation (DG), remote monitoring, remote control, and associating information and communication technologies (ICT) throughout the power network. The everlasting evolution of utility grid requires sophisticated control and communication infrastructures. The Internet of Energy (IoE) or Energy Internet (EI) that both implies same concept has been proposed as a solution to meet requirements of business and industry players. The IoE is assumed as an evolution of smart grid by integration of internet protocols and computational methods to generation, transmission, distribution and consumption levels of utility grid. This chapter introduces smart grid architecture and components in terms of physical devices and ICTs.