A view of the Siang River in Yingkom village in Upper Siang district of Arunachal Pradesh. File | Photo Credit: RITU RAJ KONWAR The story so far: The proposed Siang Upper Multipurpose Project (SUMP) in Arunachal Pradesh has triggered protests by the Adi community, and activists have been arrested or detained since October. Protesting groups rejected the Arunachal government's offer of talks on November 5.It is a proposed dam on the Siang — as the Brahmaputra is known in Arunachal Pradesh — to be built by the National Hydroelectric Power Corporation (NHPC). Why are Adi community members opposing the Siang Upper Multipurpose Project in Arunachal Pradesh? Why are Adi community members opposing the Siang Upper Multipurpose Project in Arunachal Pradesh? | Video Credit: The Hindu Published - November 12, 2026 12:38 pm IST
Why the Siang Upper Multipurpose Project has been contentious | Explained
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