Hydropower for electricity generation and biofuels for industrial and transport uses are the main renewable sources. As a result, biofuels accounted for 17% of fuels used in road transport in 2012, by far the highest share in the world and well above the OECD average of 4% (IEA, 2014a, also see Annex l. Other renewables play a minor but growing role. Brazil imports a significant share of its petroleum supply, but exploitation of pre-salt reserves discovered in 2006 could triple oil production (IEA, 2013).4 Other fossil fuels and nuclear energy play minor roles (Figure 1.5).