This comprehensive exploration delves into the transformative potential of renewable energy, examining the key technologies and their global impact. From the fundamentals of solar energy, including the science behind photovoltaic cells and their efficiency, to the growing potential of wind, geothermal, and biomass energy, this work provides an in-depth look at the systems powering our transition to a sustainable future. It also addresses the complexities of energy storage and integration, offering insights into how renewable sources can be effectively incorporated into the global grid. The book goes beyond technical details to explore the broader implications of renewable energy on society and the economy. It highlights the social impacts of energy transition, including shifts in labor markets and rural development, as well as the economic dimensions of renewable energy, with a particular focus on investment trends, market competition, and policy initiatives from major global players. In the context of climate change, it emphasizes the importance of renewable energy in achieving a carbon-free future and outlines the global policies shaping the future of energy, such as the European Green Deal and the Paris Agreement. With its combination of scientific analysis, practical applications, and socio-economic considerations, this work serves as an essential resource for anyone seeking to understand the multifaceted role of renewable energy in our evolving world.