Tuesday July 28, 2026
Stimson —
A surprise Lao-Myanmar agreement to study a massive new Mekong mainstream dam raises urgent questions about who benefits, who bears the costs, and how regional rules will apply. The proposed 2,790 MW project could reshape a remote stretch of the river while worsening long-running concerns over fish migration, sediment flows, and downstream livelihoods. Because Laos is bound by the 1995 Mekong Agreement, the project should eventually face regional scrutiny — but that process may be years away. This piece explains why the dam matters now, what risks it poses, and why civil society and Mekong governments should demand transparency before plans advance.
During a state visit by Myanmar’s disputed president Min Aung Hliang to the Lao PDR on July 4, representatives from the governments of Laos and Myanmar signed a joint agreement announcing their interest in the construction of a new dam along the Myanmar-Lao border on the Mekong mainstream.
The announcement, which has caught the Mekong watching community completely by surprise, comes as part of Min Aung Hliang’s charm offensive to shore up bilateral ties around Myanmar’s bordering countries amidst widespread condemnation of his pathway to power. For decades, mainstream Mekong dam plans have been published and circulated by the Mekong River Commission (MRC) member countries of Cambodia, Laos, Thailand, and Vietnam. Even China, which shares zero information about its Mekong dam operations, has long mapped out the locations of its 19 Mekong mainstream dams — 12 of which are now fully operational.