NHPC synchronises second 250 MW unit of Subansiri Lower HEP

NHPC Limited has synchronised the second 250 MW generating unit of its Subansiri Lower Hydroelectric Project (SLHEP) with the National Grid. The unit, designated Unit–3, was connected to the grid at 9:00 PM on 21 January 2026. 

Shri Bhupender Gupta, Chairman and Managing Director (CMD) of NHPC Limited, acknowledged the support from the Ministry of Power, Government of India, as well as the Governments of Arunachal Pradesh and Assam, and the former leadership of NHPC. He appreciated the Subansiri project team led by Shri Rajendra Prasad, Executive Director and Head of Project, and said the successful synchronisation reflects NHPC’s technical capabilities and contributes to grid stability. He added that the milestone will aid phased commissioning of the remaining units and support national energy requirements and sustainable development.

Shri Rajendra Prasad thanked NHPC management, corporate teams, executing agencies GE Vernova, BGS-SGS-SOMA, Tata Realty and Infrastructure Limited (TREL) and Patel Engineering Limited (PEL), as well as local stakeholders, for their cooperation. He encouraged the team to continue steady progress toward completion and commissioning of the balance units.

Earlier, NHPC declared the commercial operation date of Unit–2 (250 MW) of the project as 23 December 2025. The company confirmed that the trial run of Unit–2 was completed on 18 December 2025, following test synchronisation with the National Grid on 02 December 2025.

The Subansiri Lower Hydroelectric Project has a planned installed capacity of 2,000 MW, comprising eight units of 250 MW each. The project is located across Assam and Arunachal Pradesh. Once completed, it is expected to be India’s largest hydroelectric facility.

Image Source: NHPC Ltd.