The development of renewable energy in Southeast Asia has become the main focus of countries in this region in facing the challenges of climate change and increasing energy demand. Various initiatives have been launched to harness abundant natural resources, such as sunlight, wind and biomass. The growth of the renewable energy sector in Southeast Asia is largely driven by supportive government policies, as well as increasing public awareness of the importance of sustainability. Countries such as Indonesia, Malaysia and the Philippines have set ambitious targets to increase the contribution of renewable energy to their national energy mix. In Indonesia, renewable energy projects continue to develop, especially in the fields of hydroelectric power and solar power. With large solar energy potential, Indonesia is targeting 23% of its total energy mix to come from renewable sources by 2025. Foreign investment, especially in the solar power sector, is increasing, supporting the development of new installations and technologies. Malaysia has also shown significant progress in developing renewable energy. The Feed-in Tariff (FiT) program has succeeded in attracting investment for solar and biomass-based power plants. In 2020, Malaysia launched the National Power Plan 2020-2040, which targets a 20% renewable energy contribution by 2025. The focus on diversifying energy sources and energy efficiency is part of the broader strategy. Meanwhile, the Philippines is tapping into the potential of wind and hydro energy, with new projects being developed across the country. More supportive regulations and incentives for investors are key to increasing renewable capacity. The country is also committed to reducing carbon emissions through increasing clean energy. The renewable energy sector in Thailand has experienced significant development, thanks to the “Power Development Plan” (PDP) program which strategically integrates renewable energy. Thailand plans to achieve 30% of its total energy mix through renewable energy by 2036, and the biomass program is one of its main pillars. Brunei Darussalam, although known as an oil and gas producing country, is also starting to invest in renewable energy projects. This effort is devoted to the development of solar energy, which is in line with the country’s vision to create long-term energy sustainability. Vietnam, a country with rapid economic growth, aspires to become a regional leader in renewable energy. With a strong incentive program for solar and wind power projects, Vietnam plans to expand renewable capacity to 21% by 2030. This is driven by the need to meet growing energy demand. Support from international institutions also plays an important role in the development of renewable energy in Southeast Asia. Grant and loan programs from the World Bank and Asian Development Bank are helping these countries overcome financial and technical obstacles. With increasing global awareness of the issue of climate change, the development of renewable energy in Southeast Asia is a strategic step towards sustainability. New technologies, investments and innovative policies are expected to accelerate the transition to cleaner and greener energy in the region.