NHPC has successfully completed the trial run of Unit 2 (250 MW) at the Subansiri Lower Hydroelectric Project, India’s largest hydro project. Commercial supply will begin soon, with more units to follow by 2026–27. The milestone strengthens India’s renewable energy push and addresses long-standing project delays.
NHPC Limited, India’s largest hydropower producer, has announced the successful trial run of Unit 2 (250 MW) of the Subansiri Lower Hydroelectric Project (SLHEP), marking a significant step forward in the commissioning of the long-delayed project. Located on the Assam-Arunachal Pradesh border, the Subansiri project has a total planned capacity of 2,000 MW, divided into eight units of 250 MW each.
Key Highlights
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Trial Run Success: Unit 2 was synchronized with the national grid on December 18, 2025, confirming operational readiness.
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Project Scale: The SLHEP is India’s largest hydroelectric project, designed to generate 2,000 MW of clean energy.
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Future Timeline: NHPC has indicated that commercial supply from Unit 2 will begin shortly, with additional units scheduled for commissioning through 2026–27.
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Strategic Importance: The project is expected to significantly boost renewable energy capacity in the Northeast, reducing reliance on fossil fuels.
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Historic Context: Initiated in 2005, the project has faced repeated delays due to protests, construction challenges, and environmental concerns, making this achievement a major breakthrough.
Why It Matters
The successful trial run underscores NHPC’s role in advancing India’s clean energy transition, while also addressing regional power needs and strengthening grid stability.
Sources: Arunachal Times, FilingReader, The Newsman of India