Edible oil which has once been used for frying in restaurants and hotels, and no longer be utilized for such purpose. In most towns in developing countries including in Ethiopia waste cooking oil simply dumping into the environment. It has a lot of commercial value owing mainly to its ability to be recycled into useful commercial products. Alongside its usage in the creation of soaps, it can be readily broken down into glycerin and biodiesel using a simple chemical process called ‘trans esterifi cation’. Cooking oils are essentially 'triglycerides or esters' that react with an alcohol like ethanol or methanol in the presence of a catalyst (an acid or base) to produce biofuel and glycerol.