The SADC Energy Protocol outlines the various principles and objectives that the region has towards energy. Chief among those is SADCs desire to use energy to support economic growth and development in the region. Overall, SADC is a net energy exporter. In 2003, the countries belonging to SADC collectively consumed 5.9 quadrillion British thermal units (Btu) (1.4 percent of total world consumption) and produced 8.5 quadrillion Btu (2.0 percent of total world production). The regions dominant economy, South Africa, accounted for 83 percent (4.9 quadrillion Btu) of the regions energy consumption, 69.8 percent (5.9 quadrillion Btu) of its energy production, and 88.8 percent (112 million metric tons) of its CO2emissions. Throughout the region there are significant reserves of Coal, Petroleum, and Natural Gas. Electricity in SADC is generated mainly through thermal or hydroelectric resources. Natural gas is becoming more significant to the regions energy sector as Mozambique, Namibia, South Africa and Tanzania develop natural gas fields in their respective countries. Due to the regions relatively small urban population (approximately 25.4 percent), access to commercial energy sources is limited. The majority of SADCs population still relies on the use of biofuel as its primary source of energy.