This study which examines the utilisation of renewable energies in the modern tropical cities of Nigeria in the West African Region benefits from the renewable energy specialists’ views, authentic facts in texts, and the top-geomorphic exploration of the Nigerian environment. The study identifies and analyses the four most suitable types of renewable energies in the country as hydro, solar, wind, and biomass. It argues strongly that widespread beneficial development is possible in Nigeria where adequately viable and reliable energies are established and transmitted to the diverse areas of need through the public-private efforts. On this premise, the study analyses the diverse contributions of renewable energies to Nigeria’s development in the vital areas of agro-production, construction, manufacturing, communications, transportation, aesthetic tourism, human health sustenance, rural-urban business, crime reduction, research and innovations. Based on its findings, the study suggests realistic measures, which include, inter-alia, the deployment of specialists, adequate funding of energy projects, provision of effective security in the work sites, improvisation of suitable tropical technology, and improved research and innovations to sustain the continuous utilisation of modern renewable energies in Nigeria.