Discuss the ecological and social costs of large hydropower projects in the Eastern Himalaya. Suggest a framework that balances energy security with tribal rights.

The Eastern Himalaya is a biodiversity hotspot, and all of North-East India lies in seismic Zone V [2]. The region holds much of India's untapped hydropower. The Adi community is protesting the Siang Upper Multipurpose Project (SUMP), which protesters say would submerge 27 villages [1]. Their protest shows that energy security gained without tribal consent is neither just nor durable.

Ecological costs

• Seismic risk: Large reservoirs would sit in India's most earthquake-prone zone [2]. A dam failure would threaten the Assam plains below.
• Sediment trapping: Dams hold back the silt that renews the Brahmaputra floodplains, which makes erosion worse downstream.
• Altered flows: Peaking operations cause daily surges and low flows that hurt fisheries and farming along the river.
• Biodiversity loss: Flooding forests breaks up the habitats of species found only in this region.
• Cumulative stress: Projects are cleared one at a time, even though the Siang, Subansiri and Dibang dams and China's upstream dam all sit on one river system.

Social costs

• Displacement: Entire villages face submergence. Cash compensation cannot replace land the community holds in common [1].
• Cultural erosion: The Adi see the dam as a threat to their "civilisation", not just their property [1].
• Flawed consent: The community alleges "deceit, force and threats" were used, even for consent to a feasibility study [1].
• Securitisation: Barricades and Central-force check posts have turned consultation into confrontation [1].
• Costly delays: NHPC's Lower Subansiri project stalled from 2011 to 2019 because of agitations [3].

A balancing framework

Basin-wide impact study → Free, prior, informed consent → Independent expert review → Benefit-sharing → Transparent operation

Figure: The order in which hydropower decisions should be taken

• Basin-wide impact study: Assess the combined impact of all dams in the basin under the EIA Notification, 2006, before any site survey.
• Free, prior and informed consent (FPIC): Seek consent through gram sabhas and the Adi customary councils (Kebang) under the Forest Rights Act, 2006, as the Supreme Court upheld in the Niyamgiri case (2013) [4]. No cash offers in return for consent and no armed escorts for survey teams.
• Independent expert panel: Include downstream Assam on the panel and fix a minimum flow that must always be released. Subansiri work resumed only after local issues were settled and the National Green Tribunal cleared the project [3].
• Benefit-sharing: Give host communities a share of free power, equity and local jobs. Resettle displaced families on replacement land under the RFCTLARR Act, 2013.
• Right-sizing: The government should state whether SUMP is meant mainly as a strategic buffer or for peak power. It should also consider a series of smaller run-of-river plants instead.

Fragile ecology and tribal identity are not obstacles to energy security; they are conditions for it. A basin-wide approach that puts consent first would honour Article 46's duty to protect Scheduled Tribes from exploitation and support SDGs 7 and 15. It can make Himalayan hydropower both secure and legitimate.