Unit 4 Begins Commercial Operation

NHPC Limited has announced the Commercial Operation Date (CoD) for Unit #4 of its 2000 MW Subansiri Lower HE Project, effective May 8, 2026. The 250 MW unit brings the total operational capacity of the project to 1000 MW, with four out of eight units now commissioned.

Milestone for India's Largest Hydro Project

This development is a crucial step towards the full operationalization of India's largest hydroelectric project. The 250 MW addition to NHPC's operational capacity is a tangible sign of progress, bringing the project closer to full revenue generation and enhancing the company's contribution to India's power grid. This milestone builds confidence in NHPC's ability to execute large-scale infrastructure projects.

Project History: Delays and Cost Increases

The 2000 MW Subansiri Lower Hydroelectric Project has a long and complex history. Envisioned in January 2005, construction halted for eight years between 2011 and 2019 due to protests and legal challenges over dam safety and environmental impact. The project's cost has seen a significant increase, now projected at around ₹26,075 crore, up from an initial estimate of approximately ₹6,285 crore. Partial operations and wet commissioning of units have been reported since late 2025 and early 2026, leading to this latest announcement.

Potential Future Challenges

Risks include potential further delays in commissioning the remaining four units. Technical issues or environmental concerns could emerge during the final stages, and costs might continue to rise if additional work or repairs are needed.

Competitive Landscape

NHPC, India's largest hydropower developer, competes with other major power producers such as SJVN Ltd. and NTPC Ltd. SJVN focuses on hydro and renewable projects, while NTPC is India's largest utility with diverse energy sources. This commissioning update highlights NHPC's operational capacity, a key performance indicator for investors comparing it to rivals.

Looking Ahead

Investors will be watching for NHPC's announcements on the Commercial Operation Dates for the remaining four units and the target date for the project's full 2000 MW commissioning. Updates on NHPC's total operational capacity and the future financial performance from the Subansiri project upon its completion will also be key.