Energy security of the People's Republic of China concerns the need for the People's Republic of China to guarantee itself and its industries long- term access to sufficient energy and raw materials. China has been endeavoring to sign international agreements and secure such supplies; its energy security involves the internal and foreign energy policy of China. Currently, China's energy portfolio consists mainly of domestic coal, oil and gas from domestic and foreign sources, and small quantities of uranium. China has also created a strategic petroleum reserve, to secure emergency supplies of oil for temporary price and supply disruptions. Chinese policy focuses on diversification to reduce oil imports, which used to rely almost exclusively on producers in the Middle East.