SIANG DAM: INDIA'S STRATEGIC RESPONSE TO CHINA'S HYDROPOWER PROJECT AND LOCAL OPPOSITION

30 Oct 2026

Tags: Internal Security   Border Security   Land border defense

Source: The Indian Express

Context: The Siang Upper Multipurpose Project (SUMP), with a proposed capacity of 11,200 MW, is planned on the Siang River in Arunachal Pradesh.

• Strategic objective: The project is being projected as a countermeasure to China's proposed massive hydropower project on the Yarlung Tsangpo River in Tibet, which flows into India as the Siang and subsequently forms part of the Brahmaputra.
• Current controversy: Indigenous Adi communities, local residents and youth organisations are opposing the project over concerns regarding displacement, loss of ancestral land, livelihoods and cultural heritage.

Siang Upper Multipurpose Project (SUMP)

• Capacity: Proposed installed capacity of 11,200 MW, making it one of India's largest proposed hydropower projects.
• River system: Planned on the Siang River in Arunachal Pradesh, part of the Brahmaputra river system.
• Historical background:
  • 1982: The Brahmaputra Board proposed three smaller projects to harness the Siang and Subansiri rivers.
  • 2013: The Centre raised concerns over China's proposed hydropower projects on the Yarlung Tsangpo and expressed interest in becoming a downstream user of the river system.
  • 2017: Proposed Siang Upper Stage-I and Stage-II projects were merged under one umbrella, eventually taking the form of SUMP.
  • December 2024: China approved a proposed 60,000 MW hydropower project on the lower reaches of the Yarlung Tsangpo in Tibet, increasing the strategic importance of India's proposed project.

China's Hydropower Project and India's Strategic Concerns

• Upstream location: The Yarlung Tsangpo originates in Tibet and flows eastward before entering Arunachal Pradesh as the Siang River and subsequently Assam as the Brahmaputra.
• China's proposed project: The 60,000 MW project is planned on the lower reaches of the Yarlung Tsangpo in Tibet.
• Water security: India is concerned that China's upstream control over river flows could affect water availability in downstream regions.
• Potential strategic risks: Sudden water releases, dam operations and possible disruption of river flows could create risks for downstream populations and infrastructure.
• Flood management: India argues that SUMP could provide greater capacity to manage water flows and address potential downstream risks.
• Strategic uncertainty: Experts argue that India needs greater clarity regarding China's project design and operational procedures before determining the nature and scale of its own response.

Concerns Regarding the Project's Strategic Justification

• Lack of information: India does not have sufficient publicly available details about the operational procedures and technical design of China's proposed project.
• Downstream rights: Experts argue that India, as a downstream country, should seek information from Beijing regarding the proposed dam's design, water storage capacity and operational protocols.
• Questionable countermeasure: Himanshu Thakkar of the South Asia Network on Dams has questioned the assumption that constructing SUMP would automatically counter China's upstream hydropower project.
• Need for safeguards: A detailed understanding of China's project is necessary to assess potential impacts and identify appropriate technical and diplomatic safeguards.

Opposition by Indigenous Communities

• Primary stakeholders: The Adi indigenous community and residents living along the Siang River are among the major groups opposing SUMP.
• Loss of ancestral land: Residents fear displacement and the submergence of ancestral territories, threatening their traditional relationship with the land.
• Livelihood concerns: The project could disrupt agriculture, fishing and other river-dependent economic activities.
• Cultural and religious significance: The Siang River is considered a cultural, social, economic and religious lifeline by indigenous communities.
• Fear of displacement: Local residents fear becoming refugees in their own land due to the loss of ancestral property and traditional livelihoods.
• Protests: A 12-hour shutdown, rallies in Itanagar and protests by local organisations have intensified opposition. Incidents of vandalism and violence have also been reported.
• Demands: Protesters have demanded the release of activists detained in connection with the agitation and greater transparency regarding the project's implications.

Government's Position and Current Status

• National security argument: The State Government maintains that SUMP is essential to counter China's upstream hydropower project and safeguard India's national interests.
• Pre-Feasibility Report (PFR): The project is currently at the pre-feasibility survey stage, which examines its technical, economic and other aspects before further development.
• ChiefMinister's assurance: Arunachal Pradesh Chief Minister Pema Khandu has stated that the project will not progress if experts find it unfeasible.
• Public consultation: The government has promised consultations with affected communities if the project proceeds beyond the feasibility stage.
• Further assessments: These would include social impact assessment, environmental assessment and preparation of a Detailed Project Report (DPR).
• Consent-related assurance: The Chief Minister has stated that the project would not proceed if affected villagers do not want it, even after the PFR.
• Local distrust: Residents remain sceptical that the government will abandon the project after completing the pre-feasibility process.

Way Forward

• Transparency: Make technical details, feasibility assessments and anticipated environmental and social impacts accessible to affected communities.
• Prior consultation: Ensure meaningful participation of indigenous communities before major project decisions are taken.
• Environmental assessment: Examine impacts on river ecology, biodiversity, forests, sediment flow and downstream communities.
• Rehabilitation and compensation: Provide fair compensation, livelihood restoration and culturally sensitive rehabilitation wherever displacement occurs.
• Strategic assessment: Evaluate whether SUMP can effectively address the risks arising from China's upstream project rather than assuming that additional dam capacity automatically ensures water security.
• Diplomatic engagement: Seek transparent information-sharing arrangements with China regarding upstream dam construction and river-flow management.

Important Geographical Concepts

• Yarlung Tsangpo: The upper course of the Brahmaputra River flowing through Tibet.
• Siang/Dihang: The name given to the Brahmaputra when it enters Arunachal Pradesh from Tibet.
• Brahmaputra: The river flows through Arunachal Pradesh and Assam before entering Bangladesh, where it is known as the Jamuna.
• Transboundary river: A river that flows across or forms boundaries between two or more countries. The Brahmaputra is shared by China, India and Bangladesh.

Conclusion: SUMP represents an intersection of India's water security, strategic interests and indigenous rights. Any decision on the project must balance national security considerations with environmental sustainability, transparent decision-making and meaningful participation of affected communities.