Physical energy infrastructures play a critical role to deepen the extent of regional integration and economic growth in ASEAN region. To enhance the current status of the Trans-ASEAN Gas Pipeline (TAGP) and ASEAN Power Grid (APG), there is a need to address the challenges of the technical and legal issues through harmonisation of standards. In addition, the complementary development of additional supply of piped natural gas and other energy sources such as coal and liquefied natural gas (LNG) also needs to be addressed.