The landfill is a place used for landfill that can have a negative impact on the environment such as, causing greenhouse gas emissions, soil contamination, and groundwater pollution. Landfill gas content of CH4, CO2 and Non Methane Organic Compounds (NMOC) is the cause of the greenhouse effect and Global Warming Potential (GWP). The concentration of CH4 in landfill gas is relatively low, but CH4 causes a greenhouse effect 21 times greater than CO2. The research was conducted at the Talang Gulo landfill in Jambi City. The purpose of this study is to measure and analyze the production and amount of CH4 gas concentration emitted into the atmosphere and assess methane gas emissions as an energy source. The Application to estimate gas using models was with LandGEM-v302 software. The results of LandGEM- v302 simulation of landfill gas show a peak in 2023 of 3,194 x 104 Mg year-1 for total landfill gas, methane emissions A6 (8,530 x 103 Mg year-1), carbon dioxide (2,341 x 104 Mg year-1) and NMOC (3,667 x 102 Mg year-1). The potential of methane gas as a source of fuel energy is 11,403,693.84 kg year-1 and electrical energy is 182,862.08 kWh.