This study explores ASEAN energy policy for decarbonization in ASEAN countries. ASEAN is working as a regional organization in the Southeast Asia region and has proven to be a successful organization in the world. For many years ASEAN has been working on the installation of alternative energy sources in the region. The Renewable Energy Program was initiated by ASEAN to achieve carbon neutrality and promote renewable energy in its Member States. This paper delves into a critical area of energy policy and sustainability within Southeast Asia. The commitment of ASEAN nations to reduce greenhouse gas emissions and promote sustainable development, as outlined in the ASEAN Plan of Action for Energy Cooperation (APAEC) and the ASEAN Declaration on Renewable Energy, demonstrates a collective recognition of the importance of this issue. This paper qualitatively emphasizes the multifaceted nature of the challenge and the importance of a holistic approach to achieving decarbonization goals.