Subansiri dam: NHPC installs 395-tonne generator stator
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Dibrugarh: The National Hydroelectric Power Corporation's (NHPC) 2,000 MW Subansiri Lower Hydroelectric Project reached a milestone on Friday with the successful installation of the generator stator for unit 5, marking a crucial step towards the commissioning of the mega hydropower project.
The 395-tonne component, featuring an 11.5-metre bore diameter, was lowered into the generator barrel in a complex engineering operation that signals renewed momentum for the long-delayed infrastructure project. The achievement represents the largest generator installation among all Indian hydro projects to date.
"This significant achievement paves the way for early commissioning of 5 units (1,250 MW) out of the total eight units of the project.
Each of the eight 250 MW units operates with an independent water conductor system, which is a remarkable engineering achievement in itself," said Rajendra Prasad Goyal, chairman and managing director of NHPC, who attended the milestone event via video conference from the corporate office.
The installation ceremony was witnessed remotely by senior NHPC leadership, including Uttam Lal, director (personnel); Sanjay Kumar Singh, director (projects); Suprakash Adhikari, director (technical); and Santosh Kumar, chief vigilance officer.
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On-site supervision was provided by the executive director and head of the project, along with senior project officials and representatives from the equipment supplier.
The Subansiri project's journey has been marked by challenges since its inception. Originally approved by the Centre in 2003, construction began two years later with a 2014 completion target. However, despite achieving approximately 50 per cent completion of the critical infrastructure — including tunnels, dam, powerhouse, and civil works — the project ground to a complete halt in Dec 2011.
The 8-year suspension resulted from opposition by anti-dam organisations, which raised environmental and social concerns about the project's impact on local communities and ecosystems. The prolonged stalemate continued until Oct 2019, when the National Green Tribunal granted clearance.
Unlike conventional hydroelectric projects, the Subansiri facility employs run-of-the-river technology, which generates electricity by harnessing flowing water energy without requiring large reservoirs. The project infrastructure spans both in Arunachal Pradesh and Assam, with the dam situated 2.3km upstream of the Subansiri river in Arunachal. Energy experts anticipate that the full 2,000 MW capacity will strengthen India's renewable energy portfolio & enhance electricity access throughout the northeast.
After nearly two decades of planning, construction delays and renewed efforts, the Subansiri project appears back on track, with Friday's milestone marking a pivotal moment in its troubled but determined journey towards completion.
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