Energy Internet integrates small-scale renewable energy systems, electric loads, storage devices, and electric vehicles for effective transaction of power backed by emerging technologies such as Internet of Things, vehicle-to-grid, and blockchain. This work was supported in part by the Academy of Finland EE-IoT Project under Grant 319009, in part by the FIREMAN Consortium CHIST-ERA under Grant 326270, and in part by the EnergyNet Research Fellowship under Grant 321265 and Grant 328869. ABSTRACT The climate change crisis, exacerbated by the. 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. 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 power plant. The. Aalborg Universitet What Is Energy Internet? Concepts, Technologies, and Future Directions Hussain, Hafiz Majid; Narayanan, Arun; Nardelli, Pedro H.