NHPC To Begin Commercial Operation Of Unit 2 At Subansiri Lower Project In December 2025

Updated: December 03, 2025 14:08

Image Source: The Economic Times

NHPC Ltd has announced that Unit 2 of the 2000 MW Subansiri Lower Hydroelectric Project is expected to commence commercial operations in December 2025. This milestone follows the successful commissioning of Unit 1 earlier this year and marks a significant step in India’s renewable energy expansion.

NHPC Ltd, India’s largest hydropower producer, has confirmed that Unit 2 of the Subansiri Lower Hydroelectric Project (HEP) will begin commercial operations in December 2025. The project, located on the Subansiri River along the Assam-Arunachal Pradesh border, is India’s largest hydroelectric initiative with a planned capacity of 2000 MW. The commissioning of Unit 2 is expected to further strengthen India’s renewable energy portfolio and contribute to meeting the country’s growing electricity demand sustainably.

Key highlights from the announcement include

Unit 2 of the Subansiri Lower HEP is scheduled for commercial operation in December 2025.
The project has a total installed capacity of 2000 MW, making it India’s largest hydroelectric project.
Unit 1 was successfully commissioned earlier in 2025, marking the beginning of phased operations.
The project is strategically located on the Subansiri River, spanning the Assam-Arunachal Pradesh border.
NHPC has emphasized that the project will play a crucial role in enhancing clean energy generation and reducing dependence on fossil fuels.
The Subansiri Lower HEP is expected to supply power to multiple states in the northeastern region and beyond, improving grid stability.
The project has faced delays in the past due to environmental and social concerns, but phased commissioning reflects progress toward completion.
Unit 2’s operation will add significant renewable capacity to India’s energy mix, aligning with national targets for sustainable growth.

The commercial operation of Unit 2 represents a major achievement for NHPC and India’s renewable energy sector. With phased commissioning underway, the Subansiri Lower Hydroelectric Project is poised to become a cornerstone of India’s clean energy infrastructure, supporting economic growth while advancing environmental sustainability.

Sources: NHPC Corporate Filing, Business Standard, Economic Times, Mint

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