A long-dormant plan to build a mega dam on the mainstream of the Mekong River in Cambodia’s northeastern Stung Treng province appears to have been revived this year, leaving locals immediately downstream of the potential sites worried and experts confounded.
First studied in 2007, the 1,400-megawatt hydropower project, known as the Stung Treng dam, has reared its head in many forms, only to be canceled or scrapped. Finally, in 2020, Cambodia’s government announced a 10-year ban on damming the Mekong River’s mainstream, placing the Stung Treng dam and others on indefinite life support.
However, on Dec. 29, 2021, Royal Group — arguably Cambodia’s largest and best-connected conglomerate — wrote to the government, requesting permission to conduct a six-month feasibility study across a number of sites along the Mekong in a bid to revive the long-sought-after hydropower project.
The Ministry of Mines and Energy approved, and Stung Treng Governor Svay Sam Eang ordered district governors to cooperate with SBK Research and Development, a Phnom Penh-based consultancy hired by Royal Group, while they analyzed three sites for the dam between January and June 2022.
All the sites that SBK analyzed sit within or would affect the Stung Treng Ramsar site, a wetland of ecological significance that’s supposed to be protected by the Ramsar Convention, an international treaty to which Cambodia became a signatory in 1999.
The Stung Treng dam has been the subject of many studies that have amounted to very little, first in 2007 by Bureyagesstroy, a subsidiary of Russian state-owned enterprise RusHydro. More than two years later, when it became apparent Russia wasn’t going ahead with the dam, Vietnamese state-owned enterprise Song Da also conducted studies.
The volleys of criticism that each study provoked has seen the Stung Treng dam shelved repeatedly. A 2012 study by the Cambodian Fisheries Administration’s Inland Fisheries Research and Development Institute found the Stung Treng dam would reduce aquatic food yields by 6% and 24% by 2030. This, the government’s own researchers warned, would lead to increased malnutrition and worse public health outcomes, especially among poorer, rural communities.