The correct answer is: All of the above.
The Dhansiri, Kopili, and Subansiri are all rivers in Assam that have substantial hydropower potential. The Dhansiri is a tributary of the Brahmaputra River, and it has a hydropower potential of about 1,000 MW. The Kopili is also a tributary of the Brahmaputra River, and it has a hydropower potential of about 2,000 MW. The Subansiri is a major river in its own right, and it has a hydropower potential of about 3,000 MW.
The development of hydropower projects on these rivers has the potential to provide a significant amount of clean energy to Assam and the rest of India. However, there are also concerns about the environmental impact of these projects, and there has been some opposition to their development.
The Dhansiri River is a tributary of the Brahmaputra River in the Indian state of Assam. It is about 300 kilometers long, and it flows through the districts of Golaghat, Jorhat, and Sivasagar. The Dhansiri has a hydropower potential of about 1,000 MW.
The Kopili River is also a tributary of the Brahmaputra River. It is about 200 kilometers long, and it flows through the districts of Nagaon, Karbi Anglong, and Sonitpur. The Kopili has a hydropower potential of about 2,000 MW.
The Subansiri River is a major river in its own right. It is about 500 kilometers long, and it flows through the districts of Arunachal Pradesh, Assam, and Nagaland. The Subansiri has a hydropower potential of about 3,000 MW.
The development of hydropower projects on these rivers has the potential to provide a significant amount of clean energy to Assam and the rest of India. However, there are also concerns about the environmental impact of these projects, and there has been some opposition to their development.