China has approved construction of what could become the world’s largest hydropower dam, according to BBC News. The project would be built on the lower reaches of the Yarlung Tsangpo river in Tibet and could generate three times more power than the Three Gorges Dam, currently the world’s biggest hydropower plant.
That scale explains why the project has triggered concern well beyond Tibet. BBC News reported fears of displacement inside Tibet and environmental impact downstream in India and Bangladesh. Those concerns are central to the controversy because the river does not stop at China’s borders. It flows south into India and then into Bangladesh, making any upstream engineering project a regional issue.
Chinese state media has framed the dam as a safe project that prioritizes ecological protection and supports climate neutrality goals. But the report also notes that human rights groups and experts worry about knock-on effects, including displacement, landscape alteration and damage to ecosystems that are among the richest and most diverse on the Tibetan Plateau. Those opposing claims are now at the center of the debate over the dam’s purpose and cost.
The engineering challenge is enormous. Reports cited by BBC say the project would require at least four 20-kilometre tunnels through Namcha Barwa mountain to divert the river. The site sits on an earthquake-prone tectonic boundary, and Chinese researchers have previously warned that heavy excavation in the steep gorge could increase landslides. A senior engineer quoted in 2022 said earthquake-induced landslides and mud-rock flows would pose a huge threat to the project.
The river itself is part of why the dam is so ambitious. One section drops 2,000 metres over just 50 kilometres, giving the basin enormous hydropower potential but also creating difficult engineering conditions. The report says the project could cost as much as a trillion yuan, or about $127 billion, showing that Beijing is treating it as a national-scale infrastructure bet rather than a local energy upgrade.
The political sensitivity is equally large. Critics have long argued that China’s dam-building in Tibetan areas has environmental and rights implications, while Indian and Bangladeshi officials have worried about water flow and strategic leverage. The BBC report says Chinese officials have previously said they had a legitimate right to dam the river and had considered downstream impacts. That does not end the dispute, but it shows the project is already being discussed as both an energy project and a geopolitical one.
