"This dam can almost power the state of Texas," an engineer told Newsweek, with the scale of energy produced "simply astounding."

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.

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