Biogas is one of the renewable energy sources and it has a special significance in therncontext of energy crisis in populous countries like Ethiopia. Mainly cattle dung has beenrnused as the major feed material for anaerobic digestion, which is not likely to havernsignificant impact. This calls for widening the scope of this technology by tapping otherrnorganic materials like plant waste, industrial and municipal wastes. Chat producesrndifferent wastes in the city of Addis Ababa, and can be used for the production of biogas.rnIn this study, chat wastes were characterized for their physical properties such as totalrnsolids (TS) and volatile solids (VS) and they were assessed in seven combinations with orrnwithout cow dung for their suitability to biogas production in batch digesters. The TS andrnVS in the combinations varied in the range of 15 to 30 and 81 to 90 percent, respectively.rnIn the batch digesters of six week digestion (at the ambient temperature of Addis Ababa),rnthe combination chat biomass and cow dung mixed in the ratio 2:1 was found to be thernbest of all combinations producing 8640 +150ml in 40 days followed by chat biomassrnalone 8435 + 215ml in 39 days, the combination chat biomass and cow dung mixed in thernratio 1:1 as 7515 + 210ml in 39 days and the least with the cow dung as 3405 ml in 42rndays. The methane quality of 2:1 ratio was detected qualitatively for its second, third andrnfifth week. The result showed that methane quality of its second week is comparable tornthat of cow dung for the same week. This combination was selected to estimate biogasrnproduction potential under controlled temperature conditions of 35 + 3 ÂºC (optimumrnmesophilic temperature).rnThe total biogas production obtained under the controlled temperature condition wasrn14,740 + 600ml during the digestion of 35 days which is 1.7 times greater than thernambient temperature, and the biogas production potential was 0.137 m3 per kg VS added.rnThe out put of this experiment revealed that the favourable climatic conditions in chatrnxiirnproducing and consuming areas like Dire Dawa (mean yearly maximum temperature isrn31.5 ÂºC), as their yearly average temperature is in the range of higher mesophilic rangernfor optimum continuous gas production