This book provides a comprehensive exploration of current theoretical research at the intersection of green technologies, computational intelligence, and sustainable systems design. This book delves into foundational insights, formal models, algorithmic developments, and simulation-based methodologies crucial for understanding intelligent, energy-efficient infrastructures. It covers advances in renewable energy modeling, artificial intelligence for green Internet of Things (IoT), green communication systems, and mathematical modeling within sustainability-driven frameworks. With a computational and systems-oriented perspective, contributors offer detailed examinations of principles enabling next-generation green technology design. Aimed at researchers, academics, and graduate students, this book provides deep insights into theoretical foundations and computational methodologies driving innovation in green and sustainable technologies.