Recent Developments and Challenges in Renewable Energy Engineering: Solar, Wind, and Hybrid Systems

Abstract

Renewable energy engineering has advanced rapidly over the last two decades due to technological innovation, climate policy imperatives, and economic competitiveness. Solar and wind energy systems now represent the fastest-growing sources of electricity worldwide, while hybrid renewable configurations are increasingly adopted to overcome intermittency and grid integration challenges. This review critically examines recent engineering developments in solar photovoltaic technologies, wind energy systems, and integrated hybrid renewable energy architectures. Emphasis is placed on system design evolution, performance enhancement strategies, power electronics, and control mechanisms. Persistent challenges related to variability, storage integration, grid stability, material sustainability, and large-scale deployment are discussed in detail. The review synthesizes current literature to identify research gaps and outlines future engineering directions aimed at improving efficiency, reliability, and scalability of renewable energy systems.