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As the world shifts to sustainable energy, hydrogen has gained attention as an eco-friendly energy solution, but managing municipal solid waste (MSW) remains a challenge in developing nations like Nigeria. This study explores incorporating an MSW gasification-based hydrogen production system into Egbin steam turbine plant, proposing a cogeneration system combining electricity and hydrogen production. Egbin TPP has six units each consisting of K-220-12.5/50 steam turbines with unit 1 chosen as the site of the integration. A novel thermal model was formulated using CAD united cycle simulation software. The research evaluated the effects of varying morphological characteristics in MSW and the energy effects of transitioning from a condensing steam turbine plant to a cogeneration system. The findings revealed that reference fuel consumption decreased by 6.02 t/h at 75% volumetric hydrogen concentration in synthesis gas while at 25% volumetric hydrogen concentration in synthesis gas, Fuel Heat Utilization Factor (FHUF) increased from 43.37% to 57.41% (32.37% increase), confirming enhanced energy efficiency. The findings demonstrate a viable approach to combining waste management and hydrogen production within existing power infrastructure, offering a sustainable solution for energy and waste challenges.