It is pleased to announce that 2022 The 4th International Conference on Clean Energy and Electrical Systems will be held in Tokyo, Japan on April 2-4, 2022.  CEES covers a broad range of clean energy and electrical systems topics, and it will continue the tradition of the past editions organized in Lille and Morocco. Clean energy, or green energy, refers to energy that does not emit pollutants and can be directly used in production and life. It includes nuclear energy and “renewable energy.” With the continuous growth of energy demand and the increasing awareness of environmental protection in countries around the world, it is urgent and imperative to establish a clean energy innovation research and development, promotion and application system. Electricity will play a huge role in the development of clean energy. The future development trend of energy must be towards the direction of clean energy, and the ecological and economic benefits it brings will be immeasurable.