Solid waste management and its associated environmental challenges serve as a primary catalyst for transitioning toward Waste-to-Energy (WtE) technologies, which represent innovative engineering solutions integrating environmental pollution mitigation with electricity and thermal energy generation. Despite the dual benefits of these technologies in reducing landfill spatial footprints and lowering carbon emissions, their implementation faces technical, environmental, and economic hurdles that demand advanced technological solutions to ensure operational efficiency and sustainability. The primary technical challenges reside in the high heterogeneity and elevated moisture content of municipal solid waste, which severely depresses fuel calorific value and impairs direct combustion efficiency within boilers and incinerators. Furthermore, direct incineration of unsorted waste emits hazardous toxic gases—such as dioxins, furans, and acidic oxides—alongside volatile fly ash containing heavy metals that cause severe equipment corrosion and environmental contamination. In anaerobic digestion and biogas production technologies, operational bottlenecks include slow biological reaction kinetics, microbial sensitivity to temperature and pH fluctuations, and the accumulation of corrosive trace gases like hydrogen sulfide, which degrades engines and generators. To overcome these engineering obstacles, researchers and engineers have engineered a suite of advanced technological solutions. Foremost among these is the implementation of mechanical sorting and biodrying processes to produce Refuse-Derived Fuel (RDF) with high and consistent calorific values, paired with multi-stage flue gas cleaning systems using fabric filters, electrostatic precipitators, and activated carbon injection to capture toxins. Regarding biogas production, deploying advanced controlled anaerobic digesters enhanced by enzymatic additives and real-time digital monitoring accelerates fermentation, complemented by gas upgrading systems that strip hydrogen sulfide and moisture, converting raw biogas into high-purity biomethane suitable for direct grid injection. Al-Mustaqbal University – The First Private University in Iraq