This publication is a historical summary of progress made in energy cooperation in the Greater Mekong Subregion (GMS) since the beginning of the economic cooperation program in 1992. It highlights a two-pronged and phased approach to develop the GMS power market to realize the full benefits of synchronous operations---the policy and institutional framework to promote power trade and the physical interconnection to facilitate cross-border power transfers. This publication aims to help stakeholders understand GMS members' efforts in power cooperation and to draw attention to crucial issues on regional power trade.

Sino-Southeast Asian regionalism is exemplified by the development plans for the Mekong River basin, where ambitious projects for building regional infrastructural linkages and trade contribute to mediating the security concerns of the Mekong countries.

This report explains the complex challenges facing the six countries in the renewables-rich Greater Mekong Subregion (GMS) as they work to implement a comprehensive framework to enable regional electricity power trading. Against the backdrop of energy market volatility, it details how ADB is helping high-voltage electricity network operators reach a deal on interconnections which could unlock extensive economic benefits for each GMS country. Acknowledging a transparent power-sharing regime is still some way off, it provides a road map to help countries overcome infrastructural challenges and political concerns to build a fully synchronized GMS transmission network.