In compliance to Regulation 30 of SEBI LODR, a advance copy of press release dated 21.07.2026 regarding incident at Teesta VI HE Project (500 MW), Sikkim is submitted.

Company Secretariat एनएचपीसी ऑिफस कॉ(cid:817)(cid:600)े(cid:411), सै(cid:387)र-33, NHPC Office Complex, Sector-33, Faridabad (Haryana)-121003 फोन/Phone: 0129-2588110, 2278018 CIN: L40101HR1975GOI032564 ईमेल/Email:cs-co@nhpc.nic.in companysecretary@nhpc.nic.in NH/CS/199 Corporate Relationship Department/ कॉप(cid:574)रेट संबंध Listing Department/ (cid:871)लि(cid:232)टंग (cid:874)वभाग, (cid:874)वभाग, M/s National Stock Exchange of India Limited/ नेशनल M/s BSE Limited/ बीएसई (cid:871)ल(cid:871)मटेड, (cid:232)टॉक ए(cid:200)सच(cid:581)ज ऑफ इं(cid:875)डया (cid:871)ल(cid:871)मटेड, Phiroze Jeejeebhoy Towers / (cid:873)फरोज जीजीभोय टावस,(cid:91) Exchange Plaza, Bandra Kurla Complex/ ए(cid:200)सच(cid:581)ज (cid:220)लाजा, Dalal Street,/दलाल (cid:232)(cid:282)(cid:547)ट, बा(cid:289)ं ा कुला(cid:91) कॉ(cid:224)(cid:220)ले(cid:200)स, Mumbai/ मुंबई -400 001 Bandra (E)/ बा(cid:289)ं ा (ई), Mumbai/ मुंबई - 400 051 Scrip Code: 533098 Scrip Code: NHPC ISIN No. INE848E01016 Sub: Press Release- Incident at Teesta VI HE Project (500 MW), Sikkim (cid:874)वषय: (cid:292)ेस (cid:464)रल(cid:547)ज़- ती(cid:232)ता VI जल(cid:874)व(cid:622)युत प(cid:464)रयोजना (500 मेगावाट), (cid:871)सि(cid:200)कम म(cid:581) हुई घटना Pursuant to Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, it is to inform that an unfortunate incident occurred at 1.04 P.M on July 20, 2026, inside the under- construction tunnel of Teesta Stage VI Hydroelectric Project. An advance copy of Press Release dated July 21, 2026 on the above subject, is submitted herewith for your information & record please. ध(cid:219)यवाद, भवद(cid:547)य ((cid:510)पा देब) ह(cid:303)रत ऊजा(cid:330) का सश(cid:389) आधार Press Release Incident at Teesta VI HE Project (500 MW), Sikkim An unfortunate incident occurred at 1.04 P.M on July 20, 2026, inside the under- construction Head Race Tunnel (HRT) of NHPC Teesta Stage VI Hydroelectric Project, Samardung, South Sikkim, after sudden burst of suspected methane gas trapped/embedded inside the rocks which led to explosion generating dense fumes and toxic gases. Immediately, the project team activated its emergency response protocols. The project team is working in close coordination with the district administration, National Disaster Response Force (NDRF), State Disaster Response Force (SDRF), local authorities and other emergency agencies to support the ongoing rescue operations. In addition, a special rescue team from DG Mines-Safety has also reached the site for rescue operations. Our site engineering teams are working round-the-clock alongside the authorities to assist in stabilizing the tunnel environment and ensuring rescue. NHPC’s Top Management has reached the site and is closely coordinating with the rescue teams and local authorities. All possible efforts are being made for evacuation of the trapped personnel. As per the latest information from site, 25 personnel were trapped inside the tunnel, out of which 10 casualties have been reported so far. Detailed investigation will be undertaken to ascertain the cause of the incident. We remain committed and are extending full support to the rescue agencies and the affected families. In this hour of grief, prayers of NHPC family are with the affected families during this difficult time. ***************************