first cities in China to industrialize, as a focus of the First and Second Five-Year Plans. The GDP per capita of Lanzhou was 25,566 (RMB) (US$3,681) in 2008, ranking it at number 134 among 659 Chinese cities. In 2015, the GDP per capita had grown to 57,191 RMB (US$9182.28) and the city ranked at place 100 for total GDP of Chinese cities. Institutions The International Solar Energy Center (UNIDO-ISEC) is located in Lanzhou's Chengguan district. Natural resources Minerals: coal, gold, silver, zinc, nickel, manganese, clay, and dolomite Hydropower There is a thermal generating plant supplied with coal from fields in Qinghai. In addition, there is a hydroelectric station at Zhulama Gorge in Gansu, and a large multipurpose dam has been built in the Liujia Gorge on the Yellow River above Lanzhou. Industry Main industries include textile mills, rubber processing and fertilizer plants, an oil refinery, petrochemicals, machinery, and metallurgical industry. Gansu has one of the largest oil refineries in the country and Lanzhou itself is the center of the province's petrochemical industry. The refinery is linked to the fields at Yumen by pipeline. It also manufactures equipment for the oil industry. Lanzhou has a large textile industry, particularly noted for the production of woolen and leather goods. In addition, Lanzhou produces locomotives and rolling stock for the northwestern railways, as well as machine tools and mining equipment. Aluminum products, industrial chemicals, and fertilizers are produced on a large scale, and there is a large rubber industry. Copper is mined in nearby Gaolan. Lanzhou has been one of the centers of China's national nuclear power industry since the 1960s. Agriculture Lanzhou is the collecting center and market for agricultural produce and livestock from a wide area. Spring wheat, vegetables, beans, oil-boiling, melon, peaches, and tobacco Roses and lilies Transportation Airport Lanzhou Zhongchuan Airport is the main airport serving Lanzhou, it is located north of Lanzhou. It opened for public service in 1970. The airport offers direct connections to over 70 international and domestic destinations. Railway Subway Lanzhou was the second city in northwest China to announce the construction of a subway line, in August 2012. The urban railway network, Lanzhou Metro, is planned to consist of six subway lines running . The first line, which is completely underground, opened in June 2019. Lanzhou's second subway line is under construction. Regional Lanzhou Railway Station is a major railway hub of western China.