South Africa faces significant challenges in managing rapidly growing municipal solid waste (MSW) streams, which contribute to environmental pollution and lost energy potential. Converting municipal solid waste (MSW) into bioenergy presents a dual opportunity to generate renewable energy while mitigating environmental pollution in rapidly urbanizing regions like South Africa. This study evaluates the techno-economic and life-cycle performance of bioenergy production through gasification of torrefied MSW, using a 100 kg feedstock scenario representative of local municipal waste streams. Torrefaction improves feedstock quality by increasing energy density and reducing moisture content to 10%, yielding a higher heating value (HHV) of 20 MJ/kg, thereby enhancing gasification efficiency. The techno-economic assessment demonstrates that a 1 ton/hour plant converting torrefied MSW into syngas requires a capital investment of USD 4.5 million, with annual operating costs of USD 45,000. Revenue from syngas sales is projected at USD 67,000 per year, producing a Net Present Value (NPV) of USD 560,000 and an Internal Rate of Return (IRR) of 12%. The levelized cost of energy (LCOE) is USD 0.03/kWh, competitive with conventional fossil fuels. Sensitivity analyses indicate that feedstock composition, plant scale, and local energy pricing significantly influence economic viability, highlighting opportunities for optimized operational strategies. The life-cycle assessment underscores substantial environmental benefits, including GHG emission reductions of 15 kg CO₂-equivalent per 100 kg of torrefied MSW, displacement of fossil fuels, and improved energy recovery, achieving a process energy efficiency of 36% and an energy return on investment (EROI) of 3. Gasification produces 60 kg of syngas with an HHV of 12 MJ/kg and 15 kg of char, demonstrating effective material and energy utilization. Overall, torrefied MSW gasification provides a technically feasible, economically viable, and environmentally sustainable bioenergy pathway for South Africa. These findings offer critical guidance for policymakers, industry stakeholders, and researchers seeking to implement advanced waste-to-energy systems that support renewable energy deployment, methane mitigation, and the transition toward a circular bioeconomy