2021 International Conference on Smart Grid and Energy Internet (SGEI 2021) will be held in Chengdu, China on October 15-17, 2021. The conference mainly focused on Smart Grid and Energy Internet and other related research fields. It aims to provide an international exchange platform for experts, scholars and business developers in the fields of Smart Grid and Energy Internet to share research achievements, discuss existing problems and challenges, and explore cutting-edge technology. This conference will vigorously promote innovative technologies and practical applications in the energy field, aiming to fully realize the interconnection, openness, sharing and coordination of various energy resources, and to create a green, low-carbon, efficient and low-cost smart energy system. The conference sincerely invites experts, scholars from domestic and foreign universities, scientific research institutions, business people and other relevant personnel to participate in the conference.