This book is an effort to fill the gap of a comprehensive textbook that covers topics related to green energy sources. It connects climate change, sustainable development goals, and green electricity as a simple text for students, faculty, and practising engineers. It explains the green energy technology as a key part of the overall electricity network and brings practical system insights. The author's unique experience as an academic, researcher, and policy maker, combined with first-hand experience in the field, makes the book rich in practical insights, case studies and real-world applications.