This paper describes the basic features and the key structure of Energy Internet, proposes a hierarchical model, and presents key technologies, such as distributed energy storage technology, energy router technology, big data technology and blockchain, etc. It also summarizes the evolving status of. In the critical period of the global response to climate change and the promotion of energy transformation, Xin Baoan, Chairman of the Global Energy Internet Development Cooperation Organization and Chairman of the China Electricity Council, recently delivered a keynote speech entitled "Building. The Energy Internet represents a transformative paradigm integrating advanced power systems, distributed renewable energy, and digital technologies to achieve efficient, resilient, and sustainable energy management. In the network topology, the traditional tree network is transformed to the hierarchical partition network.