Volume 5, Issue 5 (2025) of Energy & System presents groundbreaking research and innovative solutions at the intersection of energy technologies and system optimization. This issue explores advancements in renewable energy systems, energy storage technologies, smart grids, and sustainable energy management. Highlighting practical applications and theoretical breakthroughs, the featured articles address key challenges in energy efficiency, system integration, and decarbonization. With contributions from leading researchers and industry experts, this edition serves as a valuable resource for those shaping the future of energy and system innovations.