The record
Written from the 1 report below. Nothing here is unsourced.
- A methane explosion on July 20, 2026 at the Teesta Stage-VI hydroelectric project in Sikkim killed at least 15 workers, with rescue operations continuing after a landslide sealed the tunnel.
- A 2024 technical paper by NHPC's own engineers shows flammable gas had been detected and had caught fire multiple times in the project's tunnels years before the blast, including at tunnel faces reached through the same access tunnel where the explosion occurred.
- NHPC says engineers were aware of methane and had safety measures in place, attributing the incident to a sudden, isolated gas release that gave no warning.
- Both NHPC and the Sikkim government have ordered investigations into the explosion.
What to watch next
- Findings of the NHPC investigation and the Sikkim Special Investigation Team into the July 20 blast.
- Status of ongoing rescue operations for workers after the tunnel was sealed by the landslide.
- Whether safety or regulatory reviews of gas monitoring at the project follow the disclosures in the 2024 paper.
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Named India · Lanco Group · Lanco Teesta Hydropower Limited · Teesta Stage VI Hydroelectric Project · Workers · EUROENGEO 2024 · International Association for Engineering Geology · National Hydroelectric Power Corporation Limited · Sikkim government
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