Sustainable Energy Systems

This Reprint presents recent advances in sustainable energy systems and explores their progress, challenges, and future prospects in the context of global decarbonization and energy transition. The collected papers cover a broad range of topics, including renewable energy technologies, hydrogen development, low-carbon transportation, smart buildings, integrated energy systems, energy security, and digital innovations for energy management. The contributions highlight how technological innovation, system optimization, policy design, and international cooperation can jointly support the transition toward sustainable and resilient energy systems. By combining engineering research, economic assessment, and governance analysis, this Reprint provides a comprehensive perspective on the opportunities and challenges facing energy systems in an era of carbon neutrality.The Reprint serves as a valuable resource for researchers, policymakers, industry practitioners, and graduate students interested in sustainable energy development and long-term energy transition pathways.