India has expressed serious concern over the strategic and environmental implications of the project with the potential of it being used a tool during geo-political tensions

China said it has talked with countries downstream about its new dam project in Tibet, a massive undertaking that will affect a key source of water for India and Bangladesh.

For Beijing, the project promises clean power, jobs and a jolt of stimulus for a slowing economy. For neighbours downstream, it stirs old anxieties about water security: the Yarlung Zangbo becomes the Brahmaputra in India and Bangladesh,