A Dam Built Against an Unknown: Testing the China Case for the Siang Project

The Promise Was Consultation First. The Survey Came With Police. In September 2026, Chief Minister Pema

Khandu made a clear commitment on the Siang Upper Multipurpose Project. It would not be rushed beyond the feasibility stage. It would not proceed if found unfeasible. Social and environmental impact assessments would follow and a detailed project report would be prepared only with consultation.

By late October, the reality on the ground looked different: a pre-feasibility survey carried out amid security deployment, prohibitory orders under Section 163 of the BNSS, more than 30 detentions and protests spreading to the Menga Dam site in Upper Subansiri.

The breakdown is not in the promise. It is in the order of steps.

Test One: Does the China Argument Hold? The

State's case is that SUMP is a national-security necessity. China adopted a project of up to 60,000 MW on the lower Yarlung Zangbo in its 14th Five-Year Plan in March 2021. A large Indian reservoir, the argument goes, could absorb a sudden release of water from upstream and protect Assam from flash floods.

The difficulty is evidence. Himanshu Thakkar of the South Asia Network on Dams, Rivers and People says India does not know even the basic dimensions of China's project and should seek details from Beijing as a downstream country.

China says the project is run-of-the-river. Data-sharing arrangements exist, but China suspended them during the 2017 Doklam standoff. A buffer designed against an unknown threat is hard to size and the case for it rests more on fear than on hydrology.

Test Two: Does the Buffer Create Its Own Risk?

SUMP would need a dam about 300 metres high, holding about 9.2 billion cubic metres of water, with an estimated submergence of over 15,000 hectares. Critics point out that the site lies in Seismic Zone V, the country's most earthquake-prone category. A dam that fails in an earthquake could cause the very downstream catastrophe it was meant to prevent. The risk does not disappear; it moves from Tibet to Arunachal.

Test Three: What Does Skipping Consent Cost? The

State may see consultation as a delay. The region's own history says the opposite. The 2,000 MW Subansiri Lower project faced protests that halted construction from 2011 to 2019. Eight years of stoppage cost far more than early consent would have.

For the Adi community, the Siang is not only a river. Thakkar describes it as a mother to riverbank communities, culturally, economically and religiously. Under the Forest Rights Act, Gram Sabha consent is required before forest land is diverted.

Protesters say they are not against dams as such; they want their land, rivers and identity protected.

What Is Working

There are still openings. The project is only at the pre-feasibility stage, so no irreversible step has been taken. Local MLA Ninong Ering admitted awareness efforts could have started earlier. The Siang Indigenous Farmers Forum has asked the Chief Minister for a meaningful dialogue.

Why This Matters for the Exam

The link that broke here is sequencing: consent came after the decision, not before. For GS3, the lesson is that strategic infrastructure in fragile, tribal border regions succeeds only when its justification is evidence-based and its consent is real.