As a result of the significant increase in population, urbanization, the lack of societal awareness, and the lack of sustainable strategies and appropriate policies for solid waste management, the problem of solid waste management has become a significant threat to the environment and living organisms in developing countries. The situation is not in the best condition in the Zahle district in Lebanon, as the lack of funding and expertise, the absence of legal systems and the Syrian refugee crisis are the most prominent obstacles faced by the municipalities of Zahle district for the optimal management of municipal solid waste (MSW). In the Zahle district, most MSW is disposed of in landfills. This approach includes several drawbacks, such as occupying large areas and becoming an environmental threat. In this paper, a review was conducted of the most common technologies for recovering energy from MSW. Based on that, anaerobic digestion (AD) technology as a potentially effective option for converting waste into energy was selected for adoption in the Zahle district. However, the main objective of this analysis was the site suitability analysis by implementing the Analytic Hierarchy Process (AHP) in a Geographic Information System (GIS) model to assess the land suitability for the AD plant. AHP was used to estimate the weights and thus determine their relative importance in the site selection of the AD plant. ArcGIS software was used to analyze the site suitability of an AD plant in this research. The map of the potential locations of the AD plant was divided into five classes: Highly suitable, most suitable, suitable, moderately suitable, and low suitable. The results indicated that the highly suitable class with an area of 1867.5 hectares contained three zones suitable for building an AD plant, according to its proximity to the current sites of sanitary landfills. Accordingly, Zone 3 with 66.79 ha was identified as the most suitable site for establishing an AD plant. The research can help decision-makers in the Ministry of Environment and the Zahle municipalities choose the appropriate technology for energy recovery from waste and select a suitable site for that plant.