The company has reported on LinkedIn that the final breakthrough of the 9.5m diameter tunnel took place on the 3.1km section between Face 4 and Face 5 and marked completion of the 8.7km head race tunnel. Nepal’s prime minister, Pushpa Kamal Dahal, attended the breakthrough.

Arun-3 is SJVN Arun-III Power Development Company’s 900MW run-of-the-river hydropower project on the Arun River in the Sankhuwasabha district of Nepal.

Patel Engineering’s works include construction of the 8.7km head race tunnel, a surge shaft, a butterfly valve chamber, two pressure shafts and an underground power house complex.