Objective: This paper provides a comprehensive analysis of the solar energy revolution, examining technological evolution, socio-economic benefits, grid integration challenges, and the pivotal role of governance and public trust in the global energy transition. Methodology: A systematic literature review following PRISMA guidelines was conducted across Scopus, Web of Science, ScienceDirect,& IEEE Xplore for studies published between 2015 and 2025. From 240 initial records, 29 high-quality studies were retained after rigorous quality assessment and synthesized thematically. Findings: The global weighted-average Levelized Cost of Energy (LCOE) for utility-scale solar PV declined from approximately USD 0.371/kWh in 2010 to USD 0.043/kWh in 2024, while battery storage costs fell from about USD 1,000/kWh to USD 130/kWh. Crystalline silicon remains dominant, while third-generation perovskites promise higher efficiency, targeting 30% by 2030, contingent on resolving stability issues. Solar deployment drives job creation, energy security, and public health benefits. However, intermittency creates grid integration challenges, including the duck curve and nonlinear storage requirements exceeding 50% PV penetration. Gridforming inverters, battery storage, and smart grids are critical enablers. Governance and public trust conceptualized as institutional, technological, and procedural are decisive determinants of deployment success. Comparative analysis of Iran, India, and South Africa reveals that energy crises, not climate policy, drive adoption in developing countries, where inequality and institutional distrust shape outcomes. Conclusion: Solar power is a cornerstone of the energy transition, delivering cost reductions, employment, and climate mitigation. Its largescale adoption requires coordinated advances in storage, smart grids, and supportive, trust-building policies, with particular attention to energy justice..