NHPC Teesta VI Project Tunnel Incident: 10 Casualties Reported
An explosion occurred on July 20, 2026, in the under-construction tunnel of NHPC's Teesta Stage VI Hydroelectric Project in Sikkim due to suspected methane gas. 25 personnel were trapped, and 10 casualties have been reported. Rescue operations are underway with NDRF, SDRF, and local authorities. A detailed investigation will follow.
The incident involves casualties and a halt in construction at a major project, which will likely have significant operational, financial, and reputational impacts.
The announcement reports a serious incident at a project site resulting in casualties, which is a negative development for the company.
An unfortunate incident occurred at 1.04 PM on July 20, 2026, inside the under-construction Head Race Tunnel (HRT) of NHPC's Teesta Stage VI Hydroelectric Project in Samardung, South Sikkim. The incident was caused by a sudden burst of suspected methane gas trapped within the rocks, leading to an explosion that generated dense fumes and toxic gases.
NHPC's project team immediately activated its emergency response protocols and is working in close coordination with the district administration, NDRF, SDRF, local authorities, and other emergency agencies to support ongoing rescue operations. A special rescue team from DG Mines-Safety has also reached the site. Site engineering teams are working around the clock with authorities to stabilize the tunnel environment and ensure rescue efforts. NHPC's top management is on-site, coordinating closely with rescue teams and local authorities, and all possible efforts are being made for the evacuation of trapped personnel.
As per the latest information from the site, 25 personnel were trapped inside the tunnel, and 10 casualties have been reported so far. A detailed investigation will be undertaken to ascertain the cause of the incident. NHPC remains committed to extending full support to the rescue agencies and the affected families.
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