Coal liquefaction offers promise for nations that are rich in coal, yet scarce in oil. There are four plants in the United States and South Africa currently using coal as feedstock to create liquid fuels. A plant using more than 6 million tons of coal annually could produce more than 3.6 million barrels of diesel and Naptha annually, making diesel liquefaction competitive at $35 to $40 per barrel oil prices. China has earmarked $15 billion for coal-to-diesel-fuel conversion plants and has targeted replacing 10 percent of its oil imports with coal-liquified oil by 2013.