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NHPC has declared commercial operations of the fourth unit of its 2,000 MW Subansiri Lower Hydroelectric Project, located near North Lakhimpur on the Assam–Arunachal Pradesh border. The INR 27,000 crore project comprises eight units of 250 MW each, with half now operational. Recognised as India’s largest hydropower project, the development is being executed as a run-of-river scheme on the Subansiri river. The phased commissioning is expected to enhance power generation capacity and strengthen regional electricity supply as the remaining units are brought online.
NHPC has commenced commercial electricity supply from the fourth unit of its 2,000 MW Subansiri Lower Hydroelectric Project, according to a regulatory filing issued in the past week. Advertisement
The unit, part of a larger hydroelectric development comprising eight units of 250 MW each, has achieved commercial operation status, marking the midpoint in the project’s phased commissioning. The company confirmed that the declaration of commercial operation for Unit 4 has been effected, with additional units expected to be commissioned in due course.
The Subansiri Lower Hydroelectric Project is being developed at an estimated cost of INR 27,000 crore near North Lakhimpur, situated along the border of Assam and Arunachal Pradesh. The project is designed as a run-of-river hydroelectric scheme with water storage on the Subansiri river, enabling power generation without large-scale reservoir submergence typically associated with conventional dams.
With four units now operational, the project has begun contributing to the regional power grid, supporting electricity supply in the northeastern region and beyond. The commissioning of additional units is expected to further augment generation capacity and improve grid stability.
The Subansiri project is regarded as the largest hydroelectric project undertaken in India to date, reflecting its scale and significance within the country’s renewable energy infrastructure. Once fully operational, the project will have a total installed capacity of 2,000 MW.
Hydropower projects such as Subansiri play a key role in India’s energy mix, particularly in balancing renewable energy supply by providing peaking power and grid support. The phased commissioning approach allows for gradual integration of capacity while ensuring operational stability.
The development has involved significant engineering and infrastructure work, including dam construction, tunnelling, and installation of generation equipment. The project’s location in a geologically sensitive and high-rainfall region has required specialised construction and monitoring measures.
NHPC indicated that updates on the commissioning of the remaining units will be provided as they achieve operational readiness. The completion of all eight units is expected to strengthen the company’s generation portfolio and contribute to national renewable energy capacity.
The project also forms part of broader efforts to harness hydropower potential in the northeastern region, where river systems offer significant generation capacity. Increased hydropower output is expected to support both regional consumption and inter-state power transmission.
As commissioning progresses, the Subansiri Lower project is expected to become a key contributor to India’s hydropower generation capacity, supporting long-term energy requirements through renewable sources.
Source - PTI
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