<p>Commercial pig farms in Cambodia are increasing, representing 30% of the overall pig production in 2018. To run the farms, huge quantity of water is used on daily basis, and its large proportion ends up being wastewater that can cause air and water pollution, fly-related illnesses, and methane emissions. In response, anaerobic digestion (AD) is applied to convert waste into energy. Covered lagoons are an anaerobic biodigester that has long been used for commercial biogas plants in Cambodia due to acceptable investment cost and favorable climatic conditions for biogas production. However, lack of local technical data and technical assessment is a barrier to wider implementation of biogas systems in the country. Therefore, the study was conducted to explore the characteristics of commercial pig farms and wastewater use; to analyze the quality of biogas compositions from different covered lagoons; and to estimate biogas production, electricity generation, and CO₂ reduction equivalent from the collected data. The study was started from January to October 2020, selecting 9 farms with evaporative cooling systems for in-depth interviews, along with direct observations, biogas analysis, and power analysis. The findings indicate that all the studied farms were fattening farms operated under purchase contract with private companies. Pig production varied from 2,800 to 7,200 head per cycle, with two cycles per year. Moreover, daily wastewater was 0.033 m3 d-1 head-1, with dry matter (DM) accounting for 0.9%. Annual biogas production and electricity generation were 32.7 m³ y^-1 head^-1 and 42.5 kWh y^-1 head^-1, respectively. Biogas quality was 59.5% CH₄, 31.5% CO₂, 1.3% O₂, and 2,256 ppm H₂S. With biogas systems, individual farms could reduce CO₂ emission by 0.676 tCO₂eq y^-1 head^-1, which is economically and environmentally beneficial. However, a business model should be taken into account for successful implementation.</p>