Nigeria's energy landscape is on the cusp of a revolution, with hydrogen emerging as a promising energy carrier. However, the country's hydrogen energy potential remains largely untapped, hindered by challenges such as high energy consumption during electrolysis and co-production of CO and CO2 during steam hydrocarbon reforming. This research addresses this critical research gap by estimating the technical potential of utilizing hydrogen from various sources in Nigeria for fuel cell usage, focusing on Solid Oxide Fuel Cells (SOFCs) and Proton Exchange Membrane Fuel Cells (PEMFCs). Our analysis reveals significant energy potential in Nigeria's waste gases, with an estimated 23.9 TWh/year from municipal landfills, 0.57 TWh/year (SOFC) and 0.96 TWh/year (PEMFC) from the chlorine industry, and 0.24 TWh/year (SOFC) and 0.25 TWh/year (PEMFC) from sodium chlorate production. By harnessing this potential, Nigeria can unlock a cleaner, more efficient energy future, driving economic growth, reducing emissions, and enhancing energy security. Notably, SOFCs are well-suited for landfill gas utilization and contaminated hydrogen sources, while PEMFCs excel with relatively pure hydrogen, but require CO removal for chlorine industry applications. The dispersed spatial distribution of waste gas sources makes on-site energy production an attractive option, underscoring the technical and practical feasibility of this approach.