An integrated, prosperous, and equitable Mekong subregion is the vision of the Greater Mekong Subregion (GMS) Economic Cooperation Program. Developing the energy sector is critical to realizing this vision. The results of the formal energy modeling exercise make a strong case for pursuing an integrated regional energy strategy. Targeted and sustained policy actions, including reforms, are necessary for a viable GMS energy strategy. Private sector participation is also key in accomplishing this goal. This book synthesizes the output of the consultative process undertaken by the Asian Development Bank's technical assistance to develop a GMS energy strategy, and proposes concrete actions for a cleaner, brighter energy future for the subregion.