The global transition toward renewable energy is imperative for a sustainable future. As the demand for cleaner and more efficient energy sources grows, the role of advanced materials, particularly sustainable and natural polymers, has become increasingly significant. These materials offer innovative solutions for improving energy generation, storage, and efficiency while reducing environmental impact. From lightweight composites enhancing wind turbine performance to biodegradable polymers optimizing energy storage devices, sustainable materials are reshaping the landscape of energy technology. The book explores the transformative potential of bio-based and eco-friendly materials in various renewable energy applications. Through in-depth discussions, the book highlights key advancements in polymer science, including biodegradable materials for solar panels, bio-based catalysts for bioenergy production, and self-healing coatings for energy devices. Additionally, it delves into innovative recycling methods and resource management strategies that enhance the lifecycle of renewable technologies.