This chapter presents the development of the Energy Internet throughout the history as an evolutionary solution based on modern technological development and needs, with the respect of its architecture, key features, and key concepts, such as energy router, prosumer, and virtual. This chapter presents the development of the Energy Internet throughout the history as an evolutionary solution based on modern technological development and needs, with the respect of its architecture, key features, and key concepts, such as energy router, prosumer, and virtual. Then, we propose a new universal definition of the EI by bringing together the various existing definitions and concepts in light of the upcoming smart grid. We also pinpoint the fundamental technologies responsible for ITM University Gwalior, India. coordinating and. Building the Energy Internet involves transforming traditional, one-way power grids into decentralized, intelligent, and two-way, digital networks. The. Energy Internet, as the product of the deep integration of energy system and Internet technology, can become a possible way to approach the "energy impossible triangle" in the process of energy transformation. The dumb centralized grid marches on a metamorphosis to a smart, distributed grid and a diversity of new market roles, business models and technologies are spawned. The ot er shore of this revolution is called Energy.