Siang Upper Multipurpose Project (SUMP)

10 Dec 2024

Siang Upper Multipurpose Project (SUMP)

Arunachal government deploys central forces to counter dam protestors in Siang Valley.

About Upper Siang Multipurpose Storage Project

  • The Upper Siang project is a proposed 11,000 MW hydropower project on the Siang River in Arunachal Pradesh.

About Siang river

Siang Upper Multipurpose Project

  • The Siang, originating near Mount Kailash in Tibet (Tsangpo), flows over 1,000 km eastward, enters Arunachal Pradesh as the Siang, and later becomes the Brahmaputra in Assam.
  • Initially proposed as two separate projects, it was consolidated into one larger project in 2017, to be built by the National Hydroelectric Power Corporation (NHPC), featuring a 300-metre high dam.
    • The Upper Siang Multipurpose Storage Project is exempt from environmental clearance requirements under the Forest (Conservation) Amendment Act of 2023.

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Strategic Importance

  • Counter China’s hydel projects on the Tsangpo, particularly a 60,000 MW ‘super dam’ in Tibet’s Medog county poses significant threats, including flash floods and water scarcity.
  • This super dam’s capacity is nearly 3x that of the Three Gorges Dam in China and is intended to divert water to northern China.

Environmental and Social Concerns: Anti-dam organizations express concerns about the project’s environmental and social impact.

  • Threat to delicate ecosystems, wildlife habitats, and biodiversity in Arunachal Pradesh.
  • Displacement of communities: The project could submerge over 300 villages of the Adi Tribe.
  • In 2022, the Gauhati High Court cancelled all 44 dams proposed on the Siang river.
    • Despite the cancellation, there are still plans to build dams on the Siang river.

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