India plans a mega dam to counter China. Why is Arunachal Gen Z protesting?

The Siang Upper Multipurpose Project, or SUMP, is India’s proposed dam project on the Siang River. It is designed as a multipurpose project, with hydroelectric generation and strategic importance linked to water security. The proposed site is in eastern Arunachal Pradesh’s East Siang district.

The Siang originates in Tibet and enters Arunachal Pradesh as a lifeline for indigenous communities. It later joins other rivers to form the Brahmaputra. The state-run National Hydroelectric Power Corporation is handling pre-feasibility surveys, technical assessments and the proposed construction process.

The project remains at the feasibility stage. Chief Minister Pema Khandu has said construction will not proceed if experts find it unsuitable. Any viable proposal would still need environmental and social assessments, a detailed project report, statutory clearances and consultations with affected communities.

India’s proposed Siang dam would have a planned generation capacity of 11,200 MW. That makes it a very large project, but China’s planned upstream project is far larger in generating capacity. The comparison matters because both projects concern the same river system and its downstream flow.

China launched construction in July 2025 in Tibet’s Medog county. Beijing estimates an investment of 1.2 trillion yuan, and the project is expected to generate around 60,000 MW. The article does not state the proposed Siang dam’s investment or either project’s water-storage capacity.

Therefore, the article supports a capacity comparison, not a storage comparison. China’s project is planned at more than five times India’s generating capacity. The scale intensifies India’s strategic concern, while the storage question requires figures not provided here.

India views the Siang project as a strategic safeguard because the Brahmaputra begins upstream in Tibet, where China is building a massive hydropower dam. The river enters India as the Siang or Dihang, then flows through Arunachal Pradesh, Assam and Bangladesh. Changes upstream could therefore matter across several regions.

China’s project is planned in Medog county, an earthquake-prone area of Tibet. Its expected capacity is around 60,000 MW, compared with India’s proposed 11,200 MW. India’s project is presented not only as a power scheme, but also as a way to strengthen water security and respond to China’s growing control over upstream waters.

The strategy remains contested. Supporters see a buffer against upstream uncertainty, while Adi protesters fear the Indian project would damage their own land and river. The government says feasibility, environmental reviews and community consultations must come first.

The indigenous Adi communities oppose SUMP because the Siang is more than a potential power source. They describe it as a sacred river and fear that the project could take ancestral land, disrupt livelihoods and damage cultural heritage. Their concerns extend to the wider landscape inhabited by their communities for generations.

The Adi Banne Kebang, the community-led apex body, is leading the opposition. It has demanded that SUMP be scrapped and that the project’s Pre-Feasibility Report be rejected. Local protesters also object to the government’s decision to continue feasibility testing despite sustained resistance.

Young people became especially active after police used tear gas during protests involving women. Journalist Tongam Rina said Gen Z anger grew after that crackdown. The protests later included reported vandalism and arson, while authorities deployed Central Armed Police Forces personnel to the tense region.

Resistance to major projects on the Siang is not new. It has continued for nearly 40 years, according to Itanagar-based journalist Tongam Rina. The current proposal revived longstanding fears about the river, land rights, community survival and the possible loss of cultural heritage.

The latest protests intensified during the past three years. A major trigger was the police crackdown involving tear gas against women protesters. Rina said this incident particularly angered Gen Z, helping turn long-running opposition into a larger youth-led movement.

Tensions rose further when the Arunachal Pradesh government said it would proceed with a feasibility test through the NHPC. On October 23, protests reportedly became violent, with vandalism and arson at political residences, a police station and the NHPC office. The Centre then deployed about 250 RAF personnel.

A river dam can change when water moves downstream and how much arrives at particular times. If China or India changed the timing or volume of releases, communities downstream could face less water during some periods or sudden increases during others. These changes could affect farming, settlements and river-dependent livelihoods.

The Brahmaputra system crosses Tibet, Arunachal Pradesh, Assam and Bangladesh. The Siang is a lifeline for indigenous communities before joining other rivers to form the Brahmaputra. Because the river crosses borders, decisions upstream can create concerns far beyond the dam site.

The article does not provide a detailed impact assessment or name exact downstream outcomes. It says intervention in the river’s upper reaches raises concerns, especially in a high-seismic zone with sharp gradients. It also frames the dispute around who controls the river and who bears development risks.

A hydroelectric dam blocks or restricts a river, creating a reservoir that stores water. Operators can hold water back and release it later. This makes the river’s flow more controllable than it would be without the dam. The article describes SUMP as multipurpose, not simply an electricity project.

When stored water is released through turbines, it flows with pressure and spins them. The turbines drive generators, producing electricity. Gates and outlets can regulate how much water passes downstream and when. The article does not provide SUMP’s reservoir design, turbine details or operating schedule.

This mechanism explains both the project’s appeal and the protests. Controlled releases can support power generation and water management, but changing a river’s flow can affect downstream communities and ecosystems. In the Siang case, those concerns are tied to ancestral land, livelihoods and cultural identity.