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China announced that construction had begun on a five-station hydropower project on the lower Yarlung Zangbo on July 19, 2025. Its estimated investment was 1.2 trillion yuan—about US$167.8 billion in the announcement—and a 2025 U.S. government commission report cited an expectation of 300 terawatt-hours of generation a year. Those are project estimates and forecasts, not an operating record. The famous claim that a Chinese dam can slow Earth’s rotation refers instead to a calculation about the filled Three Gorges Reservoir: NASA/JPL estimated a change of 0.06 microseconds in the length of a day, not a change it had detected by measurement.
What is China building on the Yarlung Zangbo?
China’s State Council reported that Premier Li Qiang announced the start of construction at a groundbreaking ceremony in Nyingchi, Xizang, on July 19, 2025. The plan is for five cascade hydropower stations on the lower Yarlung Zangbo, the river that becomes the Brahmaputra downstream in India and Bangladesh. The announcement described the stations as a connected project, rather than a single conventional dam.
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The State Council put the estimated total investment at 1.2 trillion yuan, equivalent in its report to about US$167.8 billion. The reported purpose is to supply electricity primarily for external consumption while also meeting local demand. China Yajiang Group Co., Ltd. was inaugurated to support construction and operation. These details describe the official plan and announcement; they do not establish final costs, delivered power, or the project’s current construction progress.
Is the Yarlung Zangbo project bigger than Three Gorges?
“Bigger” needs a measure. The figures available here do not provide a like-for-like comparison of installed capacity or construction scale. They do show that the Yarlung Zangbo proposal is a five-station project with an enormous announced investment estimate, while Three Gorges is a completed, operating dam with a long record of generation. A forecast of annual output for a new project should not be compared as though it were the same measure as Three Gorges’ cumulative generation over many years.
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| Measure | Yarlung Zangbo project | Three Gorges |
|---|---|---|
| Project status in cited announcements | China announced construction began July 19, 2025; later progress and a completion date are not established by the sources cited here. | Completed in 2012; its first generator entered operation in July 2003 (NASA Science, 2017; State Council of China, 2024). |
| Configuration | Five cascade hydropower stations, according to the State Council’s 2025 announcement. | Three Gorges Dam, an operating project. |
| Investment or generation figure | Estimated investment: 1.2 trillion yuan (about US$167.8 billion) in the State Council’s 2025 report. A 2025 U.S.-China Economic and Security Review Commission report cited expected generation of 300 TWh annually; this is a forecast, not measured output. | More than 1.7 trillion kWh of cumulative generation by December 2024, according to the State Council of China. |
| Social and environmental record cited here | Potential local and downstream concerns have been raised by an NGO submission; verified effects from the new project are not established here. | NASA Science reported about 1.2 million people were relocated during construction and noted flood-control and navigation benefits alongside concerns about silt and biodiversity. |
The table compares unlike kinds of evidence: an announced plan and projected annual output for one project, against historical milestones and cumulative generation for the other. It does not establish that one project is larger in every engineering sense.
Can a dam slow Earth’s rotation?
In a small, calculable way, redistributing a very large mass of water can affect Earth’s rotation. The oft-repeated Three Gorges figure is a model result about the reservoir, not evidence that scientists measured and isolated a dam-caused change in the length of a day.
What NASA’s 0.06-microsecond estimate means
In a January 10, 2005 release, NASA/JPL described a calculation for the Three Gorges Reservoir holding 40 cubic kilometers of water. Benjamin Fong Chao of NASA’s Goddard Space Flight Center said that the shift in mass “would increase the length of day by only 0.06 microseconds” and make Earth very slightly more rounded at the middle and flatter at the top. That amount is 60 nanoseconds. The conditional wording matters: it is the estimated effect of filling the reservoir, not a reported observation of the day becoming longer by that amount.
Why the number is not proof of a measured slowdown
A 2002 paper in Geophysical Research Letters independently calculated a length-of-day change of +0.060 microseconds for the filled reservoir. The two figures are consistent estimates of a modeled physical effect. Neither figure, as presented in the cited sources, establishes that a change caused by Three Gorges was directly detected apart from other influences on Earth’s rotation.
The rotation claim therefore gives a striking scale comparison, not a useful measure of the new project’s power, size, or environmental impact. The cited estimate concerns Three Gorges’ reservoir mass; the available sources do not give a corresponding calculation for the Yarlung Zangbo project.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is known—and not known—about the new project’s power?
The State Council’s announcement describes the project’s intended electricity destination: primarily external consumption, with local demand also to be served. Separately, the 2025 U.S.-China Economic and Security Review Commission report refers to an expectation of 300 TWh of annual generation and a planned ultra-high-voltage transmission line. These are reported expectations and plans, not proof of an operating output or completed transmission system.
For comparison, Three Gorges had generated more than 1.7 trillion kWh in total by December 2024, according to China’s State Council. That is a cumulative historical figure for an operating project. It cannot be set directly against 300 TWh a year, which is a forecast for a project whose operating output has not been established in the cited material.
What questions have been raised about downstream and environmental effects?
Because the Yarlung Zangbo becomes the Brahmaputra downstream, a project on its lower reaches is of interest beyond China. A statement by the Society for Threatened Peoples, submitted in January and circulated by the UN Human Rights Council in February 2025, raised concerns about possible local displacement, ecological impacts, transparency, consultation, and communities downstream in India and Bangladesh.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThose concerns should be understood as the NGO’s claims, not as findings by the UN: circulation as a UN document does not independently confirm the submission. The sources cited here do not establish a completed public environmental impact assessment or verified measurements of downstream effects from the new project. Nor do they show that the potential impacts raised by the NGO have already occurred.
The official case for the project is increased electricity supply for external consumption and local demand. Assessing its consequences will require information that is not established by the announcement alone, including detailed project and environmental information and evidence about effects on communities and river systems downstream.
Quick Recap
What can readers conclude from the available figures?
- The 0.06-microsecond Three Gorges figure is a modeled estimate for a filled reservoir, not a directly isolated measurement of a dam-induced change in day length.
- China announced the Yarlung Zangbo project’s construction start in July 2025 and described a five-station plan with an estimated investment of 1.2 trillion yuan.
- The 300 TWh annual generation figure is an expectation cited by a U.S. government commission, not an operating result.
- Three Gorges’ cumulative generation and construction history are documented historical facts; they are not directly comparable to the new project’s forecasts.
- Downstream and environmental concerns have been publicly raised, but the cited material does not establish verified impacts from the new project.
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