The economic growth is essential to the region. However, the foundation of the growth is their primary energy, which in 1995, ASEAN constituted approximately 2.5%% of the total primary energy demanded in the entire world. Some of the members are more, advance in association with the energy resources than other members. In addition, the diversification of energy in ASEAN region is an interesting field of study, where individual member has different management style and status of energy resource. For example, Indonesia is an active exporter and explorer of oil and gas, while Singapore has the third largest refining capacity in the world. Therefore, this paper is the study or the report of how ASEAN's energy sector is being prepared for the upcoming AFTA and how the AFTA is present significant impact to the energy sector.