Replacing conventional fossil fuels (such as coal, heavy fuel oil, and virgin natural gas) with synthetic and biogas derived from waste recycling represents a strategic transition toward energy sustainability and the circular economy. This technological approach enables power generation facilities to leverage synthesis gas (Syngas) and biomethane produced via pyrolysis, gasification, and anaerobic digestion of municipal and agricultural waste streams, effectively transforming landfills from environmental pollution hazards into productive clean energy reservoirs.The primary technical and economic challenges stem from the lower calorific value of waste-derived gases compared to conventional natural gas, alongside fluctuations in gas flow rates and chemical compositions based on variable waste feedstocks. In power plant combustion chambers and turbines, these dynamics induce operational bottlenecks, including reduced thermal efficiency, flame instability, and accelerated chemical and mechanical corrosion of internal boiler tubes caused by trace hydrogen sulfide ($H_2S$), halogens, and siloxanes. Furthermore, retrofitting existing generation facilities requires substantial capital expenditure (CAPEX) for downstream gas conditioning, scrubbing, and upgrading infrastructure prior to combustion.To overcome these engineering obstacles, researchers and advanced power engineers have pioneered robust gas cleaning and cost-optimization technologies. These include multi-stage gas scrubbing and drying trains, activated carbon filtration units, and nano-membrane separation modules that bring waste gas purity up to grid- and turbine-grade specifications. Concurrently, flexible multi-fuel and dual-fuel burners have been engineered to adjust dynamically to fuel blending and Wobbe Index fluctuations. Environmental and economic impact assessments confirm that this fuel displacement slashes carbon dioxide equivalent ($CO_2e$) emissions by 60–80% while generating lucrative tipping fees and waste management revenues, ensuring short capital payback periods and reinforcing long-term grid sustainability. Al-Mustaqbal University – The First Private University in Iraq