The project on a river that runs through Tibet and India downstream could dwarf the Three Gorges Dam when completed.

China has started the construction of the world's biggest hydropower dam in Tibet, a project estimated to cost 1.2 trillion Yuan.The mega-dam on the Yarlung Zangbo River , located in the

China has started construction of the world’s biggest hydroelectric dam, a project that’s set to be far larger than the Three Gorges Dam — already the world’s biggest single source of green power — and more expensive than the International Space Station.