Southeast Asia faces one of the fastest growths in energy demand in the world, driven by increasing incomes, urbanisation, and industrialisation. The development and deployment of green energy technologies offer a natural conduit to meet the growing energy needs in the Association of Southeast Asian Nations (ASEAN). This chapter undertakes a case study approach in reviewing green energy deployment in the context of green growth and energy transition and discusses the current status of renewable energy development in ASEAN. The study aims to formulate policy lessons for the ASEAN economies in facilitating the development and deployment of green technologies and alternative energy options based on a case-study approach for delivering sustainable economic growth and in combating climate change in the region. The review suggests that carbon capture and storage (CCS) technologies will allow ASEAN to continue to use fossil fuels whilst achieving sustainable economic growth as coal demand increases in the region. The deployment of CCS technologies is also an enabler of hydrogen energy as a green energy solution in the region in the longer term. The shorter-to-medium-term policies include boosting public acceptance to nuclear energy, implementing energy efficiency improvement policies, and eliminating fossil fuels consumption subsidies. Increasing both public and private sector energy investments and the development of CCS technologies in the longer-term are necessary complementary policies for maximising the benefits of greater deployment of renewable energy sources in the region.