Future Energy: Challenge, Opportunity and Sustainability presents new advances and research results in the fields of theoretical, experimental, and practical sustainable energy engineering and contains selected research papers presented at the 2023 7th International Conference on Sustainable Energy Engineering (ICSEE 2023), held in Sydney, Australia during February 17-19, 2023 . Contributions cover case studies to explore and analyze technological advancements alongside practical applications to help readers better understand the relevant concepts and solutions necessary to achieve clean energy and sustainable development. ICSEE 2023 also brings together the latest developments in the emerging areas of intelligent power systems, green energy, and technology, offering approaches that can help engineers and researchers working in sustainable energy engineering technologies solve practical problems that affect their daily work.