China began constructing the Yarlung Tsangpo hydropower project on July 19, 2025, a reported five-station, roughly 60,000 MW scheme costing about $167.8 billion. India’s proposed 11,200 MW Siang Upper Multipurpose Project in Arunachal Pradesh, still in feasibility, is pitched as storage and flow regulation to address downstream risks in Arunachal and Assam amid diplomatic calls for data sharing.
