The use of processed sewer sludge — in other words, human waste — as a biomass fuel for power generation is increasingly being used in Kyushu and throughout the nation. Kumamoto City plans to commercialize the operation in 2013, and Kitakyushu is planning to follow suit in 2015. Construction started on the Kumamoto City plan in January. When it begins operation next year, it will have the capacity to process 16,000 tons of the sludge, roughly half the amount produced in the city. That will be converted to 2,300 tons of fuel for use at power plants.