The Subansiri Lower Hydroelectric Project is located in the Indian state of Arunachal Pradesh.

- Introduction to the Subansiri Lower Hydroelectric Project:
The Subansiri Lower Hydroelectric Project is a mega hydropower project located on the Subansiri River in the northeastern state of Arunachal Pradesh in India. It is one of the largest hydroelectric projects in the country and is being developed by the National Hydroelectric Power Corporation (NHPC).

- Location of the Project:
The Subansiri Lower Hydroelectric Project is located in the Dhemaji and Lakhimpur districts of Arunachal Pradesh. The Subansiri River, a major tributary of the Brahmaputra River, flows through these districts. The project site is situated near the Gerukamukh village in Dhemaji district.

- Significance of the Project:
The Subansiri Lower Hydroelectric Project has a planned capacity of 2,000 megawatts (MW) and is expected to generate approximately 7,421 gigawatt-hours (GWh) of electricity annually. This massive project aims to harness the hydroelectric potential of the Subansiri River and contribute to the overall energy requirements of the country.

- Challenges and Controversies:
The Subansiri Lower Hydroelectric Project has faced several challenges and controversies over the years. One of the major concerns raised by environmentalists and local communities is the potential impact on the biodiversity and ecology of the region. The project involves the construction of a dam, which could lead to the displacement of local communities and affect the livelihoods of the people dependent on the river.

- Environmental and Social Impact Assessment:
In order to address the concerns raised by various stakeholders, the project underwent an Environmental and Social Impact Assessment (ESIA) process. The assessment aimed to evaluate the potential environmental and social impacts of the project and suggest mitigation measures. The ESIA report provided recommendations to minimize the negative impacts and ensure sustainable development of the project.

- Current Status:
The Subansiri Lower Hydroelectric Project has faced delays and suspension due to various reasons, including environmental concerns, protests, and technical challenges. As of now, the project is still under construction and is expected to be completed in the near future.

In conclusion, the Subansiri Lower Hydroelectric Project is located in the Indian state of Arunachal Pradesh. It is a significant hydroelectric project that aims to harness the power of the Subansiri River and contribute to the country's energy requirements. The project has faced challenges and controversies, but efforts are being made to address the concerns and ensure sustainable development.