Context: Siang Upper Multipurpose Project (SUMP) – Proposed 11.2-GW hydropower and multipurpose project in Arunachal Pradesh.
- Strategic motivation: China's construction of a proposed 60-GW mega-dam on the Yarlung Tsangpo River in Tibet has raised concerns over the possible weaponisation of transboundary river waters.
- India views SUMP as a strategic buffer against potential Chinese manipulation of Brahmaputra water flows.
China's Mega-Dam and India's Strategic Concerns
- China's project: The proposed 60-GW mega-dam involves five cascading power stations over an approximately 2,000-metre river fall across 50 km.
- Potential threat: China could potentially manipulate downstream flows through:
- Water diversion: Reducing water availability and creating drought-like conditions downstream.
- Sudden water release: Causing catastrophic floods in Arunachal Pradesh and Assam.
- Lack of transparency: Beijing maintains that the project will not harm downstream countries but has declined to share crucial engineering and operational details.
- Territorial dimension: China's disputed claims over Arunachal Pradesh further complicate the issue.
Limitations and Uncertainties of India's Strategy
- Limited control over Brahmaputra flows: The Brahmaputra basin in Assam and Bangladesh receives most of its water from monsoon rainfall and tributaries originating downstream of the Tibetan Plateau. Therefore, China cannot directly control the river's entire flow into India.
- Need for hydrological information: SUMP requires information about China's dam operations as well as downstream water inflows to regulate its reservoir effectively.
- Limited cooperation: Despite repeated discussions at the highest levels, China has agreed only to share hydrological data on humanitarian grounds during emergencies.
- Reservoir management: Indian planners have considered maintaining SUMP's reservoir at 70% capacity to accommodate unexpected water surges. However, its effectiveness without advance warning from China remains uncertain.
- Diplomatic necessity: Regular information-sharing and cooperation with Beijing are essential for the safe operation of SUMP.
Environmental and Geological Concerns
- Seismic vulnerability: The Eastern Himalayas are among the world's most tectonically active and erosion-prone regions.
- Dam safety risks: Large dams in such fragile terrain raise concerns regarding earthquakes, landslides, erosion and reservoir safety.
- Cascading dam development: Multiple power stations constructed sequentially along a river can create interconnected risks, making coordinated operation and safety monitoring essential.
Land Rights and Opposition to Hydropower Projects
- Local resistance: The Adi community and civil rights groups have opposed SUMP, raising concerns over land acquisition and the state's approach towards local communities.
- Coercive approach: Deployment of security forces to protect survey teams and invocation of the State Unlawful Activities (Prevention) Act against activists have intensified local apprehensions regarding land dispossession.
- Subansiri project: Sustained protests against the Subansiri Upper Hydroelectric Project further reflect opposition to Arunachal Pradesh's model of hydropower development.
- Development versus rights: Strategic and national energy-security objectives cannot justify bypassing legal safeguards, land rights and democratic consultation.
Way Forward
- Respect land rights: Ensure compliance with applicable land acquisition laws, community rights and safeguards before proceeding with the project.
- Community participation: Involve the Adi community and other affected stakeholders in decision-making through meaningful consultation and transparent communication.
- Strengthen diplomacy: Pursue institutionalised hydrological data-sharing and transparency regarding China's dam operations.
- Scientific assessment: Undertake comprehensive environmental, geological and seismic risk assessments before project implementation.
- Disaster preparedness: Develop early-warning systems, reservoir-management protocols and coordinated emergency-response mechanisms.
- Democratic development: Balance national security and energy requirements with environmental sustainability and the rights of local populations.
Relevant Concepts for UPSC
- Transboundary Rivers
- Rivers flowing across or between national boundaries are governed by principles of international water cooperation.
- Equitable and reasonable utilisation and the obligation not to cause significant transboundary harm are important principles of international watercourse law.
- Cascading Hydropower Projects
- A series of hydropower stations constructed sequentially along the same river, where water released from an upstream station flows into downstream stations.
- Such projects can improve cumulative power generation but require coordinated reservoir operations, dam-safety monitoring and environmental management.
- Brahmaputra River System
- Origin: Angsi/Chemayungdung glacier region in Tibet, where it is known as the Yarlung Tsangpo.
- India: Enters Arunachal Pradesh, where it is known as the Siang/Dihang; subsequently flows through Assam as the Brahmaputra.
- Bangladesh: Enters Bangladesh as the Jamuna and eventually joins the Ganga-Padma system.
- Major tributaries in India: Subansiri, Dibang, Lohit, Manas and Teesta.
