In West Africa, where millions still lack access to electricity, solar home systems (SHS) ofer a ray of hope. These modular renewable energy solutions have been instrumental in bridging the gap, bringing light to remote areas where traditional grid extension is challenging. . Why is solar power struggling to make a breakthrough in West Africa despite its increasing competitiveness? What can be done to release its potential and help countries in West Africa pursue low-carbon development while also bringing energy access to those who still need it? We see four major. . This paper addresses long-term historical changes in solar irradiance in West Africa (3 to 20 ∘ N and 20 ∘ W to 16 ∘ E) and the implications for photovoltaic systems. Here, we use satellite irradiance (Surface Solar Radiation Data Set – Heliosat, Edition 2. The International Energy Agency's World Energy Outlook. . In West Africa energy demand is growing fast and, the spotlight is increasingly shifting toward solar, as a practical, scalable solution for both urban centers and off-grid communities. Now, after one full year of use, the results are clear and can help other governments and EPC contractors when preparing. .