Why in News? 

Govt. has approved environmental clearance for Oju Hydroelectric Project in Arunachal Pradesh, paving the way for one of India’s largest hydroelectric project near China border. 

• A 2,220 MW run-of-river hydro project. 
• Aims to tap into Subansiri basin’s hydropower potential, boosting India’s renewable energy; the largest in the basin, crucial for basin-wide energy planning. 
• Subansiri River (Gold River) is a Trans-Himalayan river 
• Origin– Western part of Mount Porom in Tibetan Himalayas. 
• Enters India through Miri Hills, Arunachal Pradesh. 
• Merges with Brahmaputra (longest tributary on the right northern bank) at Majuli Island, Assam, largest river island in Asia.