EI² focuses on innovative technologies and practical implementations around 2 EIs (EI² in abbreviation) — “Energy Internet” and “Energy System Integration”, which can be interpreted as the fusion of energy systems with information technologies and artificial intelligence as well as the coupling of multiple energy systems (e.g., heating, cooling, electricity, gas, and transportation). This conference will promote innovative EI² technologies and practical applications which aim to fully realize the interconnection, openness, sharing, and collaboration of various energy resources, and to create green, low-carbon, high-efficiency and low-cost smart energy systems.tems.