Etalin Hydroelectric Project

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NHPC Limited has signed a Memorandum of Agreement (MoA) with the Government of Arunachal Pradesh for the development of the 3,097 MW Etalin Hydroelectric Project, one of the largest proposed hydropower projects in India.

About Etalin Hydroelectric Project

Location

The Etalin Hydroelectric Project is located in the Dibang Valley district of Arunachal Pradesh. It is planned on the Dri and Talo rivers, both of which are important tributaries of the Dibang River.

With an installed capacity of 3,097 MW, it is among the largest hydropower projects proposed in India.

Project Design

The project will be developed as a combination of two Run-of-the-River (RoR) hydropower schemes.

It involves the construction of concrete gravity dams on both the Dri River and the Talo River. The water from these dams will be channelled to an underground powerhouse located near the confluence of the two rivers, close to Etalin village.

The project is expected to generate approximately 12,752 GWh (Gigawatt-hours) of electricity every year, contributing significantly to India's renewable energy generation.

Ecological Significance

The project area lies within one of the richest biogeographical provinces of the Himalayan region and is recognised as one of the world's mega-biodiversity hotspots.

The region is home to exceptionally rich biodiversity, including several endemic, rare, and threatened species of plants and animals. Because of its ecological importance, the project has attracted considerable attention regarding environmental conservation.

Indigenous Communities

The project area is predominantly inhabited by the Idu-Mishmi tribe, one of the major indigenous tribal communities of Arunachal Pradesh.

The Idu-Mishmis have a close cultural and traditional association with the forests and rivers of the Dibang Valley, making their participation and rehabilitation important aspects of the project.

Implementation and Execution

The project is being developed by NHPC Limited (formerly known as the National Hydroelectric Power Corporation), India's premier public sector company in the hydropower sector.

It will be implemented under the Build, Own, Operate and Transfer (BOOT) model.

Under this arrangement, NHPC will finance, construct, own, operate, and maintain the project before transferring it to the Government after the completion of the concession period.

The company will operate the project for a lease period of 40 years from the Commercial Operation Date (COD).

What is a Run-of-the-River (RoR) Hydropower Project?

A Run-of-the-River (RoR) project generates electricity by utilizing the natural flow of a river without creating a large storage reservoir.

Such projects generally have a smaller environmental footprint than conventional storage dams because they require limited water storage. However, electricity generation depends largely on the seasonal flow of the river.

What is a Concrete Gravity Dam?

A Concrete Gravity Dam is a type of dam that resists the pressure of water primarily through its own weight.

Its massive concrete structure allows it to remain stable against the force exerted by the stored water, making it suitable for large hydropower projects.

What is the BOOT Model?

The Build, Own, Operate and Transfer (BOOT) model is a form of Public-Private Partnership (PPP).

Under this model, the developer constructs the project, owns and operates it for a specified concession period to recover its investment, and finally transfers ownership to the government after the lease period ends.

Significance of the Project

The Etalin Hydroelectric Project is expected to strengthen India's renewable energy capacity, improve energy security, and contribute to the country's clean energy transition.

It will support the economic development of Arunachal Pradesh by creating employment opportunities, improving infrastructure, and promoting regional development.

At the same time, its location within a biodiversity hotspot highlights the need to balance development with environmental conservation and the protection of indigenous communities.