India fears a planned Chinese mega-dam in Tibet could cut Brahmaputra River flows by up to 85 percent in the dry season, a government analysis shows. Beijing’s $170bn project, the world’s largest hydropower dam, could divert over a third of annual flows before the river enters India, Reuters reported.

In response, New Delhi is fast-tracking the proposed Upper Siang Multipurpose Dam in Arunachal Pradesh, which would be India’s biggest. Officials say it could offset water losses, stabilize supplies, and absorb potential surges from Chinese releases.

China insists its project will not harm downstream nations, but Indian officials view it as a strategic risk. The Brahmaputra supports more than 100m people across China, India, and Bangladesh, according to Reuters.