India’s drive to modernize and decarbonize its power sector received a significant boost today as the second 250 MW unit of the Tehri Variable Speed Pumped Storage Plant (PSP) began its Commercial Operation Declaration, announced virtually by Power Secretary Pankaj Agarwal. Developed by THDC India Limited, the Tehri PSP is distinguished as the country’s first variable‑speed pumped storage facility and the largest hydropower plant commissioned by a central public sector enterprise
The launch event featured dignitaries including Additional Secretary Akash Tripathi, Joint Secretary Mohammad Afzal, NTPC CMD Gurdeep Singh, and THDCIL CMD R.K. Vishnoi. Secretary Agarwal praised the milestone as a “path‑breaking development,” underscoring its significance in strengthening grid flexibility and supporting India’s renewable integration efforts
CMD Vishnoi emphasized the strategic importance of the plant, noting that once all four units are operational by September 2025, the Tehri Hydro Power Complex’s capacity will soar to 2,400 MW. This capacity will be instrumental in converting off‑peak surplus into peaking power, stabilizing the grid and reducing dependency on thermal generation
Utilizing high-tech variable‑speed turbines supplied by GE Vernova, the plant enhances operational precision and efficiency, enabling rapid power adjustments to match fluctuating demand—a critical capability for any modern grid integrating renewable sources . The project draws on the existing reservoirs formed by the Tehri and Koteshwar dams, leveraging them to create a sophisticated energy storage system that delivers about 2,442 million units annually .
This milestone follows the COD of the first unit on June 7, 2025, and reinforces THDCIL’s capability to deliver complex infrastructure under challenging conditions, as lauded by CMD Vishnoi and NTPC’s Gurdeep Singh . The Tehri PSP now stands as a model for future energy storage projects, fulfilling India’s commitment to renewable energy and grid resilience.
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