The energy transition in Southeast Asia is at a critical juncture as the region's energy demand is set to more than double by 2050. Southeast Asia faces the challenge of balancing energy security, climate ambitions, and population growth. However, this also presents an opportunity for the region to lead in the global energy transition. The ASEAN Power Grid (APG) vision advocates for regional interconnectivity to unlock the potential of renewable energy sources and create a robust integrated energy market. Collaboration and partnerships among ASEAN countries and dialogue partners are essential to realizing the APG vision. Initiatives like the Lao PDR-Thailand-Malaysia-Singapore Power Integration Project showcase the feasibility of cross-border power trade. Singapore is supporting projects to import low-carbon electricity from Australia, Cambodia, Indonesia, and Vietnam, highlighting the collaborative efforts within the region. Partnerships with countries like the United States and Australia on renewable energy technologies and regional power integration are crucial for accelerating the sustainable energy transition in Southeast Asia. Initiatives on hydrogen, geothermal energy, and carbon capture and storage (CCS) are showing promise in enhancing the region's climate resilience. The article emphasizes the importance of partnerships and collaborations in driving innovation and ensuring Southeast Asia's position at the forefront of the global energy transition. By working together, the region can build a connected and sustainable world, benefitting not only Southeast Asia but also global supply chains, economic growth, and climate stability.