Southeast Asia has considerable resources to produce liquid biofuels sustainably, using biomass feedstocks that would not cause carbon-dioxide emissions or interfere with food supply. This report offers detailed estimates of biomass resource potential for Indonesia, Malaysia, the Philippines, Thailand and Viet Nam. According to an IRENA assessment, advanced biofuels could provide as much as 7.3 exajoules of primary energy per annum in Southeast Asia by 2050, or half of the region’s total primary bioenergy potential.