The proceedings are compilation of selected papers from the 5th International Conference on Smart City and Green Energy (ICSCGE 2025). This collection of papers explores the latest advances in sustainable green energy, emphasizing innovative methods, technological breakthroughs, and practical applications. Topics include smart city, green energy, smart grid, power system, energy-efficient technologies, environmental impact assessment, and policy analysis, all of which are vital for addressing global energy challenges. The proceedings feature theoretical and technical innovations, detailed case studies, data-driven analyses, and visual illustrations to enhance understanding. A special focus on interdisciplinary approaches and novel presentation formats aims to inspire researchers, practitioners, and policymakers. Readers will gain valuable insights into cutting-edge research trends and practical solutions, benefiting those engaged in the development of sustainable energy systems and environmental preservation.