The central government has granted environmental clearance to the Oju hydroelectric project in Arunachal Pradesh’s Upper Subansiri district, paving the way for construction of one of India’s largest hydropower ventures in a geologically sensitive and strategically vital border region with China.

The 2,220 MW run-of-the-river project will be developed by Oju Subansiri Hydro Power Corporation Pvt. Ltd. at an estimated cost of ₹24,942 crore. It envisages a 100-metre-high concrete gravity dam, a 14.12 km headrace tunnel and an underground powerhouse complex, capable of producing 8,402 million units of electricity annually.

The project is the biggest among a series of dams proposed on the Subansiri river, long considered the lifeline of Assam. In the making for nearly two decades, it has draw

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