China’s rivers have long been pressed into the service of the state. Today they are being conscripted on an unprecedented scale. By the end of 2025 the country’s installed hydropower capacity stood at roughly 450 gigawatts, more than 40% higher than a decade earlier and far ahead of any other nation. Official plans aim for 570 GW by 2030, with pumped-storage capacity alone targeted to more than double to 160 GW. China accounted for over 40% of global hydropower additions in 2025 and has more than 300 GW under construction.
The flagship of this new phase is the Lower Yarlung Tsangpo project in Tibet, a scheme designed to generate around three times the electricity of the Three Gorges Dam by exploiting a vertical drop of more than 2,000 metres through tunnels bored into Himalayan bedrock.
The logic is straightforward. Hydropower supplies large volumes of low-carbon electricity and, increasingly, the flexibility needed to balance intermittent wind and solar generation. Cascade systems on the Yangtze—Three Gorges (22.5 GW), Baihetan (16 GW) and their siblings—already form a vast clean-energy corridor. Pumped-storage plants act as giant batteries, absorbing surplus power and releasing it at peak times. For a country still heavily reliant on coal yet determined to meet ambitious renewable targets, the appeal is obvious. Energy security, industrial demand and grid stability all point in the same direction.
Yet the physical and human costs are substantial. Large dams fragment rivers, trap sediment and alter seasonal flows. On the upper Mekong (Lancang), China has built more than a dozen mainstream dams. Peer-reviewed studies attribute to them the retention of roughly half to 60% of the river’s historical sediment load. Downstream, the annual flood pulse that sustains the Tonle Sap lake and the Mekong Delta has been disrupted; fisheries have declined and saltwater intrusion into Vietnamese farmland has intensified. Similar concerns surround projects on the Salween and the tributaries of the Brahmaputra. Reservoirs in seismically active and geologically unstable terrain raise risks of landslides and induced earthquakes—problems already documented around the Three Gorges. Displacement figures are harder to pin down precisely, but historical projects have moved hundreds of thousands of people; estimates for the wider Tibetan programme run into the high hundreds of thousands.
Abroad the pattern is repeated under the Belt and Road Initiative. Chinese firms and policy banks have financed or built dozens of dams across Southeast Asia, South Asia and Africa. Laos has become a prominent laboratory: multiple Chinese-backed projects have turned the country into a power exporter while adding to its heavy external debt burden, much of it owed to Chinese creditors. Pakistan’s China-Pakistan Economic Corridor includes several large schemes. In Myanmar, Cambodia and elsewhere, projects have drawn criticism for biodiversity loss, the fragmentation of remaining free-flowing rivers and inadequate consultation with affected communities. Chinese developers have sometimes stepped into schemes once promoted by multilateral lenders, completing projects that others had abandoned on environmental or social grounds.
The strategic dimension is hard to ignore. Control of the Tibetan “water tower” gives China influence over rivers that sustain roughly 1.8 billion people downstream. Upstream storage and release decisions can mitigate or exacerbate droughts and floods in neighbouring states. Transparency remains limited; data-sharing agreements exist but are often viewed as insufficient by India, Vietnam and others. Downstream governments face a dilemma: they need electricity and investment, yet resent the loss of hydrological autonomy. The result is a form of hydro-diplomacy in which Beijing’s leverage is structural rather than theatrical.
None of this means hydropower is uniquely Chinese or uniquely malign. Many countries have built large dams and lived with the trade-offs. China’s distinction lies in the sheer scale, the concentration of projects at the headwaters of Asia’s great rivers, and the speed with which it is moving into geologically and politically sensitive terrain. Climate change adds another layer of risk: accelerating glacial melt and permafrost thaw in the high mountains increase the likelihood of landslides, debris flows and sudden floods that can overwhelm even well-engineered structures.
China’s hydropower expansion will continue. The economics of system flexibility, the politics of energy security and the inertia of large state-owned enterprises all favour it. The question is whether the country can internalise more of the external costs—better sediment management, genuine downstream consultation, stricter seismic and glacial-risk assessment—or whether the great wall of water will keep exporting its consequences downstream. For the moment, the turbines keep turning, and the rivers keep adjusting to a new master.
