China’s secretive plan for world’s most powerful ‘mega-dam’

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🗞️ Driving the news: China has begun building a $168 billion hydropower system on Tibet’s Yarlung Tsangpo River, set to become the most powerful on Earth
• The project could generate up to three times the electricity of the Three Gorges Dam, supporting China’s electrification, AI expansion, and energy security goals
• Construction has started in a remote, seismically active Himalayan region
• It remains largely undisclosed to the public

🔭 The context: The dam sits at the river’s dramatic “Great Bend,” where water drops 2,000 meters in just 50 kilometers
• China frames the project as a clean-energy and climate solution, but details on design, safety, and environmental assessments are limited
• The river flows downstream into India and Bangladesh, making it a sensitive transboundary water issue tied to geopolitics and border tensions
• Experts warn the system could involve multiple dams, tunnels, and reservoirs across protected ecosystems

🌍 Why it matters for the planet: The project highlights the double-edged nature of mega-scale climate infrastructure
• Hydropower could significantly cut coal use and emissions in the world’s largest carbon-emitting country
• But altering one of Asia’s most biodiverse river systems risks ecosystem collapse, species loss, sediment disruption, and downstream food insecurity
• Climate change is increasing seismic, flood, and landslide risks, raising concerns that a failure could amplify environmental and human disasters

⏭️ What’s next: Construction is expected to accelerate, while scrutiny from scientists, neighboring countries, and rights groups intensifies
• India and Bangladesh are pushing for greater data-sharing and safeguards
• Without transparency and cooperation, experts warn of a regional dam-building race that could worsen ecological damage

💬 One quote: “It’s the most sophisticated dam system ever built — and also the riskiest,” said Brian Eyler of the Stimson Center

📈 One stat: The project’s estimated output of 300 billion kWh per year could triple that of the Three Gorges Dam

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