Mumias is engaged in the manufacture and sale of sugar. The company grows some sugar cane; its own estates provide up to 7% of its annual output. Its primary source of sugarcane is over 50,000 registered "out growers" with over 400 km² under cultivation. It has also piloted the production of a hybrid high-yielding palm oil variety in areas previously thought too cool for commercial cultivation, in collaboration with the UNFood and Agriculture Organization (FAO). In 2005 Mumias managing director Evans Kidero announced plans to expand into the production of ethanol to take advantage of the high cost of fuel. Mumias is located in Western Province in an area that is traditionally occupied by the Luyia ethnic group.