The aim of the Second International Conference on the Future Sustainable Energy (February 20-22, 2024, Al-Mustaqbal University, Iraq) was to create a platform for discussing coherent and coordinated efficient ways of developing new and renewable energy resources, developing green materials and sustainable technologies in architecture and construction, implementing metallic materials to biomedical practice, designing tools and analysing materials processing technologies. The engineering research and design of machines and equipment and investigation of heat and mass transfer phenomena in engineering systems were also presented in this edition. This collection will be interesting to many specialists in materials science and mechanical engineering.