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. 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. Energy Internet, a futuristic evolution of electricity system, is conceptualized as an energy sharing network. Its features, such as plug-and-play mechanism, real-time bidirectional flow of energy, information, and money can lead to significant benefits and innovation in electricity production and. Abstract The next-generation electric power system, known as the smart grid, will incorporate a large number of renewable energy resources that fundamentally change the energy man-agement paradigm. In order to manage ef ciently the energy supply and demand in the power grid, energy routers are. umption resulted climate change urges a transformation of the energy sector. 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. Facing the comprehensive complex challenges of the Energy Internet practice, such as the imperfect design of the technical structure system, incomplete standard system and synergetic control between multi-energy supplement, this paper first explains the importance of building an energy internet.