Laos has emerged as a major regional energy supplier since 2010, constructing over 70 dams along the Mekong River and its tributaries. However, environmental groups and international researchers report that this rapid development is causing widespread ecological damage, including deforestation, river degradation, and biodiversity loss, with limited public oversight.
The nation has branded itself the “battery of Southeast Asia,” exporting electricity to Thailand, Vietnam, Cambodia, and Myanmar. The government aims to increase generation capacity from approximately 10,000 megawatts to 30,000 megawatts by 2030. Most projects are run-of-river dams, which divert water through turbines without large reservoirs but still require extensive infrastructure. “The sheer number of dams in such a short period is unprecedented for a country of this size,” said Dr. Somsak Chanthavong, a hydrologist at the National University of Laos.
“We are seeing cumulative impacts that were not fully assessed when individual projects were approved.” Construction has cleared large forest areas for access roads, transmission lines, and worker camps. Satellite data from Global Forest Watch indicates forest loss in dam construction zones rose by 40 percent between 2015 and 2023 compared to the previous decade.
River Ecosystems and Fisheries Under Pressure
The Mekong River supports one of the world’s most productive inland fisheries, providing protein for 60 million people across Southeast Asia. Dams block fish migration routes, alter water flow, and trap sediment that fertilizes downstream floodplains.
“Fish catches in the lower Mekong have declined by an estimated 30 percent over the past 15 years,” said Dr. Khamphone Vongxay, a fisheries biologist at the Mekong River Commission. “Dams are a primary driver, along with overfishing and climate change.” Sediment trapping behind dams is starving the Mekong Delta of nutrients, accelerating erosion and saltwater intrusion in Vietnam. A 2024 study in Nature Sustainability found that Laos’ dams trap up to 60 percent of sediment that would otherwise reach the delta.
The Nam Theun 2 dam, one of the largest, flooded 450 square kilometers of forest, and downstream communities report reduced fish numbers and changes in water quality.
Social Costs and Relocation Challenges
Hydropower projects have forced the relocation of an estimated 100,000 people in Laos since 2000, according to International Rivers. Many resettled communities receive inadequate compensation and struggle to maintain livelihoods. “We were promised new houses, schools, and jobs,” said Bounthong Sisouphanh, a village chief in Khammouane province whose community was relocated for the Nam Theun 2 dam.
“But the land we got is poor for farming, and the fishing is not the same.” The government has a resettlement policy requiring developers to restore incomes to pre-project levels, but implementation is inconsistent. A 2023 World Bank audit, which helped finance Nam Theun 2, found many households still had lower incomes than before relocation.
Regulatory Gaps and Enforcement Issues
Laos lacks a comprehensive environmental impact assessment system for hydropower projects. The Ministry of Energy and Mines approves most dams, while the Ministry of Natural Resources and Environment has limited authority to enforce mitigation measures. “There is a fundamental conflict of interest when the same ministry that promotes dam construction also oversees environmental compliance,” said Dr. Anoulak Kittikhoun, a policy analyst at the Stimson Center’s Southeast Asia program.
“Independent oversight is almost nonexistent.” International lenders like the Asian Development Bank and the World Bank impose environmental safeguards on financed projects, but many dams are built by Chinese and Thai companies with fewer requirements. The Xayabury dam, the first on the mainstream Mekong in Laos, was built by a Thai company and began operating in 2019 despite objections from downstream countries.
Balancing Energy Needs and Environmental Protection
Laos exports about 70 percent of its hydropower, earning revenue for infrastructure and poverty reduction programs. The government argues clean energy helps combat climate change by displacing coal-fired power in importing countries.
“Hydropower is a renewable resource that provides stable electricity and foreign exchange,” said a spokesperson for the Lao Ministry of Energy and Mines, speaking on condition of anonymity. “We are committed to sustainable development and are working with international partners to improve environmental management.” Environmental groups counter that benefits are overstated. A 2024 International Union for Conservation of Nature report found that methane emissions from tropical reservoirs can make some dams worse for the climate than fossil fuels.
The report also noted that most electricity from Laos’ dams goes to industrial users in Thailand, not to rural communities in Laos that still lack reliable power. Strengthening enforcement of existing laws, establishing independent monitoring, and shifting toward smaller, less destructive projects are needed to address these challenges.
