Renewable Energy Technologies: A Physics-Based Review

Abstract Renewable energy technologies are central to achieving a sustainable and low-carbon energy future. This review examines the physics-based principles underlying major renewable energy technologies, including solar, wind, hydropower, ocean energy, and energy storage systems. Fundamental concepts such as thermodynamics, electromagnetism, semiconductor physics, and electrochemical processes are explored to explain energy conversion mechanisms and performance limitations. The study discusses photovoltaic and solar thermal technologies, wind turbine aerodynamics, hydropower generation, tidal and wave energy systems, battery storage, hydrogen energy, and fuel cells. Additionally, challenges related to grid integration, system stability, energy storage, and sustainability assessment are analyzed. The review highlights recent technological advancements, policy considerations, and emerging research directions that support the transition toward reliable, efficient, and environmentally sustainable energy systems. Understanding the physical foundations of renewable energy technologies is essential for improving efficiency, reducing costs, and accelerating global adoption.