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Oju 2,200 MW Hydel Project

Context:

The Union Environment Ministry’s expert panel has recommended environmental clearance for the 2,200 MW Oju hydroelectric project near the China border in Arunachal Pradesh.

Project Overview:

Location:Subansiri basin, Arunachal Pradesh, close to China border.
Proposed Capacity: 2,200 MW (largest in terms of approved capacity in the basin).
Distance & Site: 5 km downstream of Redi village, Upper Subansiri district.
Developer:Subansiri Hydro Power Corporation Pvt Ltd (central public sector enterprise).

Technical and Environmental Aspects:

Dam Height & Area: Requires diversion of 750 hectares of forest land; submergence of 43 hectares.
Villages Affected: Nine families will be displaced; rehabilitation planned in Redi village.
Hydrology & Flood Risk: Detailed assessment required for glacial lake floods, dam-break scenarios, and other environmental risks.

Strategic and Regional Significance:

Part of North-East infrastructure push for hydropower development.
Positioned in cascade of hydro projects in the Subansiri basin.
Close to international border, adding strategic energy security significance.

Subansiri River

Type: Trans-Himalayan river, right-bank tributary of the Brahmaputra.
Alternate Name: "Gold River" — owing to presence of gold dust in river sediments.
Length: ~518 km.
Drainage Basin: ~32,640 sq.km.
Contribution to Brahmaputra: ~7.92% of total flow ? largest tributary of Brahmaputra

Course & Geography

Origin: Himalayas in Tibet Autonomous Region (China).
Flow Direction: East and southeast into India.
Countries/States Covered:
- China: Tibet Autonomous Region.
- India: Arunachal Pradesh and Assam.
Major Confluence: Joins Brahmaputra at Lakhimpur district, Assam.
Important Sections:
- Upper reaches: Mountainous terrain in Tibet and Arunachal Pradesh ? high velocity, steep gradient.
- Lower reaches: Plains of Assam ? floodplain formation and fertile soils.

Tributaries

Key tributaries include:Tsari Chu, Nye Chu, Char Chu, Taksing Chu

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GS Analyst: Daily Current Affairs

Oju 2,200 MW Hydel Project