Operational Incident
NHPC Reports Incident at Teesta VI Hydroelectric Project in Sikkim
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NHPC Limited has informed the stock exchanges about an unfortunate incident at its under-construction 500 MW Teesta Stage VI Hydroelectric Project in South Sikkim. The company has activated emergency response mechanisms, deployed senior management to the site and is coordinating with multiple government agencies to carry out rescue operations.
PRICE-SENSITIVE TRIGGER
Event: Incident at Teesta VI HE Project (500 MW), Sikkim
Type: Operational Incident
Impact: Neutral
Immediate Effect: Emergency rescue operations were launched immediately while authorities began stabilizing the tunnel environment and assessing the situation.
What Happened ?
An incident occurred at around 1:04 PM on July 20, 2026, inside the under-construction Head Race Tunnel (HRT) of NHPC’s Teesta Stage VI Hydroelectric Project located at Samardung, South Sikkim.
According to NHPC, a sudden release of suspected methane gas trapped within rock formations led to an explosion, producing dense fumes and toxic gases inside the tunnel.
key details
Key Developments:
- Emergency response protocols were activated immediately.
- NHPC is coordinating rescue operations with:
- National Disaster Response Force (NDRF)
- State Disaster Response Force (SDRF)
- District Administration
- Local authorities
- Other emergency response agencies
- A specialized rescue team from DG Mines Safety has reached the project site.
- Engineering teams are working continuously to stabilize tunnel conditions.
- NHPC’s senior management has reached the site to supervise rescue efforts.
- As per the latest information available:
- 25 personnel were trapped inside the tunnel.
- 10 casualties have been reported.
- A detailed investigation will determine the exact cause of the incident.
Note:
- NHPC stated that it remains fully committed to supporting rescue operations and extending assistance to the affected families.
Risk Analysis
Summary:
- The incident creates significant operational uncertainty for the Teesta Stage VI project and may affect construction progress depending on rescue outcomes and investigation findings.
Key Risks:
- Construction schedule may face delays.
- Regulatory scrutiny and safety reviews may increase.
- Human casualty and employee safety remain the primary concern.
- Financial implications cannot yet be quantified.
Worst Case:
- If investigations require prolonged suspension of construction activities or identify major structural or safety issues, project execution timelines could experience significant delays.
Risk Level: Medium
Company Commentary
- Emergency response was initiated immediately after the incident.
- Senior management is coordinating rescue efforts at the project site.
- Every possible effort is being made to evacuate trapped personnel safely.
- A detailed investigation will be undertaken to determine the cause.
- The company remains committed to supporting rescue agencies and the affected families.
- NHPC expressed its condolences and prayers for the affected families during this difficult period.
Official Exchange Filing: NHPC Limited
