The project has stoked concerns about displacement and environmental impact downstream in India and Bangladesh.

Beijing has approved plans to dam a gorge in the Himalayas that is three times as deep as the Grand Canyon, despite concerns about the impact on Tibet and India.

Analysts warn huge hydroelectric project in Tibet could risk geological disasters and irk New Delhi as neighbours try to ease tensions Beijing's approval of a controversial mega dam in the lower reaches of the Yarlung Tsangpo River,