ECONOMY Thermal and gas energy Its energy sources are Kainji, Jebba, Shiroro, Egbin (IkoroduLagos), Afam, Ughelli and Sapele. The installed capacity (2005) is 6,130 megawatts (MW). Electricity generation The energy produced was 24,208.92 gigawatt hours (GWH) in 2004 and 20,635.74 GWH in 2005. Aluminium smelter Fertilizer There is an aluminium smelter at Ikot Abasi. Fertilizers are manufactured at Onne, Port Harcourt, Kaduna, Minna and Kano. The main seaports are located at Lagos (Apapa, Tin-Can Island and Main seaports Roro), Port Harcourt, Warri, Onne Deep Sea Hub Port and Calabar, an Export Processing Zone. Main airports The main airports are at Lagos, Kano, Abuja, Port Harcourt, Enugu, Kaduna, Jos, Owerri, Calabar, Maiduguri, Ilorin, Yola and Sokoto. INTERNATIONAL TRADE (2005) Exports Main exports Nigeria’s main exports were crude and refined oil, distillation products, tin, columbite, nickel, aluminium, sulphur, salt and other minerals, cocoa, rubber, plastics, crustacean, mollusc, food, cassava, raw hides and skins, and leather. Major export partners Nigeria’s main partner was the United States of America (US), with 58.4 per cent. Other partners were the United Kingdom (UK), Germany, France, Italy, South Africa, West African countries, the Netherlands, Belgium, China, Taiwan and Saudi Arabia. Imports Main imports XII Exports totalled US$59 billion. Imports totalled US$25 billion. Nigeria’s main imports were manufactured goods, machinery and transport equipment, vehicles, aircraft, chemicals, mineral products, computers and accessories, fuels, oils and oil products, photographic and cinematographic goods, spirits, tobacco, textiles and telecommunications equipment.