China Begins $167 Billion Tibet Dam as India and Bangladesh Fear Risks Downstream

A Giant Power Project on a Shared River

China has begun construction of a hydropower project costing an estimated 1.2 trillion yuan, about $167 billion, on the Yarlung Tsangpo river in southeastern Tibet. As of July 21, 2025, the project promises electricity generation on a scale beyond the Three Gorges Dam, while bringing new concerns about water supplies, earthquakes, biodiversity and the rights of communities along the river.

Known as the Motuo Hydropower Station or the Yarlung Tsangpo Dam, the development is expected to become the world's largest hydropower dam and generate three times as much electricity as Three Gorges, China's current record holder. Its planned annual output is 300 billion kilowatt-hours, enough to supply entire provinces.

The river crosses borders and changes names. It becomes the Brahmaputra in India and the Jamuna in Bangladesh, sustaining millions of people who depend on its water for farming, fishing and daily life. Decisions about its flow in Tibet therefore reach far beyond the construction site.

Beijing presents the project as a source of clean electricity, economic growth and greater energy security. India and Bangladesh fear damage to their water security and ecosystems, while Tibetan communities face the prospect of displacement and the loss of places with religious and cultural meaning.

The central issue is how a river can serve China's electricity needs while continuing to support people and landscapes downstream. No binding agreement among China, India and Bangladesh sets out how they should share its water or settle disputes over its use. Construction is moving ahead against that backdrop of competing needs and mistrust.

Why the Great Bend Attracts Engineers

The Yarlung Tsangpo makes a dramatic U-turn around Namcha Barwa mountain, cutting through the world's deepest and longest canyon. Around this Great Bend, the river drops about 2,000 meters over a stretch of 50 kilometers. That steep descent gives the water enormous potential to generate electricity.

Hydropower uses moving water to turn turbines, which drive electricity generators. A large drop allows engineers to draw energy from water descending between different heights. The geography around Namcha Barwa is therefore central to the project's exceptional scale.

Engineers plan five cascading power stations and multiple tunnels, each about 20 kilometers long, through the Namcha Barwa massif. The tunnels would divert part of the river's flow to maximize electricity production. A cascade means several stations work along successive drops in the river system.

The projected 300 billion kilowatt-hours describes electricity generated over a year. The comparison with Three Gorges concerns that annual production: the new development is expected to produce roughly three times as much electricity.

Building it will require transporting equipment into a remote region, drilling through a mountain massif and managing powerful rapids. Those tasks demand advanced technology and substantial investment, with risks of delays, rising costs and environmental effects that emerge during construction.

Electricity for Eastern China, Investment for Tibet

President Xi Jinping and Premier Li Qiang have championed the project within China's broader strategy of xidiandongsong, or sending western electricity eastwards. The aim is to use hydropower resources in Tibet and other western regions to supply cities in eastern China with large electricity needs.

Most of the electricity is intended for transmission out of Tibet, although some provision is planned for local consumption. Beijing also sees the investment as a way to stimulate Tibet's economy, one of the poorest regional economies in China.

The dam supports China's effort to reduce carbon emissions and its pledge to achieve carbon neutrality by 2060. Carbon neutrality means balancing the carbon emissions that remain with an equivalent amount removed or offset. Hydropower generates electricity from flowing water rather than by burning fuel.

China also links the development to national security. Vice Premier Zhang Guoqing described the creation of the state-owned China Yajiang Group, which will oversee construction, in these terms:

strategic decision for national and energy security.

Commercial operations are expected to begin by 2033. Beyond electricity and investment, Beijing views development in this sensitive border region as a means of consolidating control and asserting sovereignty amid territorial disputes with India.

A Nature Reserve Faces Major Changes

The Yarlung Tsangpo Grand Canyon contains more than 4,500 plant species and Asia's tallest trees. Its wildlife includes snow leopards, Bengal tigers and Tibetan brown bears, making the region a major center of biodiversity.

The area is also a national nature reserve. Environmentalists warn that reservoirs and other construction could flood valleys, change habitats and disrupt the balance between plants, animals and the river. Some losses could be irreversible.

Water flow connects these habitats. Changing where water travels, how quickly it moves and when it reaches particular places can alter the conditions on which river ecosystems depend. The planned diversion of part of the flow through mountain tunnels makes those changes a central concern.

The construction zone is also seismically active, meaning it is exposed to earthquakes. An earthquake could threaten the dam's integrity and trigger disasters affecting communities downstream. Managing that danger adds to the engineering challenge posed by the canyon and its powerful river.

China says the project has undergone scientific evaluation and will not harm the ecological environment or the water rights of countries downstream. Chinese officials also argue that it can help regulate seasonal floods while supplying clean energy. Environmental concerns center on the scale of the changes and the consequences if safeguards fail.

Why Sediment Matters as Much as Water

India and Bangladesh depend on more than the volume of water arriving from upstream. Rivers also carry sediment, the particles of soil, sand and other material that move with the current. That material supports agricultural land and helps maintain river deltas.

A dam can hold back sediment in its reservoir. Environmentalists fear that trapping large quantities on the Yarlung Tsangpo could affect farming and food security downstream, while contributing to coastal erosion in Bangladesh and the Sundarbans, the world's largest mangrove forest.

Changes to sediment movement can reach places far from a dam. Farmers depend on productive land, fishing communities depend on healthy river habitats, and coastal communities depend on landscapes that withstand erosion. The concern is therefore about the river's ability to support livelihoods along its course.

China's experience with dams on other major rivers, including the Mekong, adds to those fears. Upstream dams there have been associated with droughts, reduced fish populations and disrupted sediment flows needed for agriculture and delta stability.

The Yarlung Tsangpo project brings those issues into a river system shared by three countries. Its electricity benefits are directed primarily toward China, while possible changes in water, fish habitats and sediment would also affect communities in India and Bangladesh.

India and Bangladesh Seek Assurances

India has formally raised its concerns with Beijing through its Ministry of External Affairs, calling for transparency, consultation and protection of downstream interests. Its concerns cover water supplies, agriculture, ecological stability and the possibility that control over the river could become a strategic tool during conflict.

Arunachal Pradesh Chief Minister Pema Khandu has warned that the project could threaten local tribes and their livelihoods. He described it as an:

existential threat

Khandu also used the phrase:

water bomb

His warning concerns the possibility of catastrophic flooding if China suddenly released large amounts of water during a crisis. For communities downstream, the timing and speed of a release can matter alongside the total quantity of water flowing through the river.

Bangladesh has requested more information from China. There, the river is known as the Jamuna, and about 70% of the population in its densely populated Brahmaputra basin depends on it for water, agriculture and fishing.

Chinese officials promise to maintain communication with affected neighbors. Beijing's position is that the development will protect downstream water rights and can improve seasonal flood regulation. India and Bangladesh are seeking greater visibility into a project that could change conditions along a shared river.

No Binding Framework for Sharing the River

China, India and Bangladesh have no binding agreement governing how they share the Brahmaputra's water. The basin also lacks a formal mechanism for cooperation or resolving disputes over projects such as this one.

Other international rivers have legal arrangements. The Indus is governed by a treaty between India and Pakistan, while a convention involving 14 countries provides a framework for cooperation on the Danube in Europe.

China has supplied hydrological data to India and Bangladesh since the mid-2000s. Hydrological data describes river conditions, including information about water levels and flow. Such information helps countries understand what is happening upstream.

Data arrangements, however, leave downstream countries exposed to decisions taken upstream without a shared agreement on water use or dam construction. Calls for a treaty focus on equitable access, environmental protection and a way to manage disagreements before they escalate.

India's Planned Buffer Has Its Own Costs

India is reviving plans for a large dam on the Siang, the name used for the Brahmaputra in Arunachal Pradesh. The project is intended to provide a buffer against sudden releases from China's development.

A reservoir can hold water and influence how quickly it moves farther downstream. India's proposal reflects concern that communities need protection from changes originating beyond the border.

The proposed response also brings environmental and social costs. India's project could submerge villages, affect ecosystems and force changes in local livelihoods. It has already prompted local opposition.

Communities along the river therefore face decisions on both sides of the border. A project presented as protection from an upstream dam can itself require people to give up homes or land. That makes consultation and the treatment of affected residents central to India's plans as well as China's.

Tibetans Face Displacement and Cultural Loss

The Yarlung Tsangpo has deep spiritual importance for Tibetans, who regard the river as sacred and believe it embodies the goddess Dorje Phagmo. The surrounding valleys and mountains contain religious and cultural sites that could be submerged or become inaccessible.

For Tibetan communities, the project's costs extend beyond changes to water and wildlife. Losing access to sacred places can disrupt religious practice and ties to particular landscapes, while relocation can separate people from the land that supports their livelihoods.

Thousands of Tibetans have already been forcibly relocated for dams, mining operations and infrastructure projects. Traditional grazing lands have been flooded or degraded, contributing to lost livelihoods and cultural erosion.

Protests against dam construction have faced harsh crackdowns, including arrests and violence, according to accounts from Tibetan exile groups and international media. Activists argue that local voices and rights are being ignored as development of Tibet's resources accelerates.

A report in the Tibetan Review described the wider ecological concern:

The cumulative ecological damage threatens not only Tibet's high-altitude biodiversity but also the health of river systems that sustain communities across South and Southeast Asia,

The number of people who would be displaced specifically by the Yarlung Tsangpo project has not been given. Its expected effects on homes, grazing areas and sacred sites remain a major concern for communities whose relationship with the river is economic, cultural and spiritual.

The Dates and Decisions That Shape the Project

The construction program extends across years, while water cooperation predates it and China's climate commitment stretches further ahead. The main milestones are:

• Since the mid-2000s: China has provided hydrological data to India and Bangladesh.
• July 21, 2025: Construction has begun on the Yarlung Tsangpo hydropower project.
• 2033: The project is expected to begin commercial operations.
• 2060: China's target year for achieving carbon neutrality.

Climate change adds pressure to decisions about the river. Faster glacier melt and changing rainfall patterns affect water security, farming and the management of seasonal flows. More than 1.3 billion people across 10 countries depend on rivers originating on the Tibetan Plateau.

Calls for cooperation include a trilateral agreement among China, India and Bangladesh, drawing on arrangements such as the Danube Convention. The proposed goals are shared access to water, protection of ecosystems and prevention of conflict.

Deep mistrust, competing national interests and the lack of a shared legal framework make such an agreement difficult. China's construction plans, India's proposed Siang dam and Bangladesh's request for information show how the same river is driving different national responses.

The project's promise is a vast supply of electricity and investment. Its costs and risks reach from Tibetan valleys to farms, fisheries and coastal landscapes downstream. How the countries manage water releases, sediment, safety and the treatment of affected communities will shape what the development means for people along the river.

Key Points

• China has begun a hydropower project in southeastern Tibet estimated to cost 1.2 trillion yuan, about $167 billion.
• Five cascading power stations and tunnels through Namcha Barwa are planned, with annual generation expected to reach 300 billion kilowatt-hours.
• The project is expected to generate three times as much electricity as Three Gorges and begin commercial operations by 2033.
• India and Bangladesh are concerned about water supplies, sudden releases, agriculture and environmental damage downstream.
• Earthquake exposure, biodiversity loss, sediment disruption and Tibetan displacement are central concerns.
• China says scientific evaluation supports the project and promises communication with downstream countries.
• No binding water sharing agreement connects China, India and Bangladesh, while India is pursuing a dam on the Siang that faces local opposition.