Electricity demand in Southeast Asia is rising rapidly, and the International Energy Agency estimates that demand from the ten members of the Association of Southeast Asian Nations (ASEAN) will rise 60% through 2040. Reliably meeting projected needs will require doubling the region’s current power generation capacity and significantly expanding transmission infrastructure. This burden does not fall equally on all ASEAN members, and the five Mekong countries have proposals for more than 170,000 MW of new power generation projects through the mid-2030s. Although Thailand’s annual electricity demand growth is slower than its neighbors, just under one third of that 170,000 MW will be built to meet Thailand’s projected energy needs.