An attempt had been made to design and develope a flexible balloon stirring digester for anaerobic digestion of JOC. The investigation showed that Jatropha Oil Cake had biogas generation potential of 101.65 litre per kg of dry matter. A stirring device was used to agitate the slurry inside the digester. The methane content of biogas derived from JOC was found to be in the range of 63-68%.