NHPC Launches India’s Largest Hydropower Project – Subansiri Lower HEP Begins Operations

About the Event

In a historic development, the National Hydroelectric Power Corporation (NHPC) has finally commenced operations of the much-awaited Subansiri Lower Hydel Project—touted as India’s Largest Hydropower Project. After an incredible 13-year delay, the project officially began its wet commissioning on October 26, 2025, marking a new milestone in India’s renewable energy journey.

Date, Timing, and Launch Details

The wet commissioning ceremony took place in the early hours of October 26 at the Subansiri dam site located on the Assam-Arunachal Pradesh border. The launch was timed to coincide with auspicious hours considered favorable for new beginnings, according to local traditions and NHPC’s internal schedules.

Importance and Significance

• Energy Generation: Once fully operational, the project will generate over 2,000 MW of clean hydropower, reducing India’s carbon footprint significantly.
• Regional Growth: The Subansiri Lower Hydel Project is expected to boost economic activity and infrastructure development across Assam and Arunachal Pradesh.
• Environmental Impact: The project uses advanced sediment management and ecological balance systems to minimize environmental disruption.

Benefits and Reason Behind the Buzz

The excitement around the Subansiri Lower HEP isn’t just about power generation. It represents India’s transition toward sustainable energy and reduced dependency on fossil fuels. Experts call it a “symbol of resilience” – overcoming political delays, technical challenges, and environmental hurdles to finally emerge as a beacon of green power.

Latest Update

NHPC officials have confirmed that test runs are currently underway, with full-scale generation expected to begin by December 2025. The remaining units will be synchronized in phases over the next few months, ensuring stable grid integration and minimal power fluctuations.

Disclaimer

This article is based on the latest reports and publicly available information from official NHPC sources and national media. Readers are advised to verify details from the NHPC website for final confirmation.

FAQs on NHPC’s Subansiri Lower Hydel Project

Q1. What is the Subansiri Lower Hydel Project?

It’s India’s largest hydropower project, developed by NHPC, located on the Subansiri River between Assam and Arunachal Pradesh.

Q2. When did the project begin operations?

The wet commissioning began on October 26, 2025, after a 13-year delay, marking the start of test operations.

Q3. What is the power generation capacity of the project?

The Subansiri Lower HEP is designed to generate around 2,000 MW of electricity, significantly boosting India’s renewable power output.

Q4. Why is this project significant for India?

It symbolizes India’s growing focus on green energy, regional development, and environmental responsibility while providing a major boost to the power grid.