The 570 MW Wangchhu Hydroelectric Project has entered its main construction phase, with the first blast for the diversion tunnel on 1 September 2026, marking the start of underground excavation and a major step toward construction of the dam.
The Diversion Tunnel is a critical component of the project’s overall construction sequence. Its timely completion will allow the Wangchhu to be diverted, clearing the way for construction of the dam and associated structures.
Project officials said diversion works have therefore been taken up ahead of the main civil works, because the dam sits on the critical path of the project’s ambitious 60-month construction schedule.
Designed to safely carry the diversion flood during dam construction, the diversion system comprises twin tunnels, each 10 meters in diameter and measuring 545 meters and 460 meters in length respectively. A 151 metre adit has been incorporated to provide additional access and enable excavation from multiple working fronts, helping accelerate the tunnelling.
The Nu. 1.27 billion construction package for the diversion tunnel has been awarded to Hindustan Construction Company (HCC), which has extensive experience in major infrastructure, hydropower, and complex underground construction.
The diversion tunnel and its associated structures are scheduled for completion within nine months. This will allow the main civil contractor to begin dam construction immediately upon award of the main civil works is contract.
The ceremony was graced by Dasho Chhewang Rinzin, Managing Director of Druk Green Power Corporation Limited (DGPC) and Chairman of the Board of Directors of Wangchhu Hydroelectric Power Limited (WHPL), as the chief guest.
Speaking at the ceremony, Dasho Chhewang Rinzin underscored the project’s significance within the broader context of Bhutan’s Renewable Energy Roadmap, which aims to add 20,000 MW of generation capacity by 2040 in support of the country’s long-term economic development and energy security.
DGPC and Adani Power Limited are developing the Wangchhu Hydroelectric Project through a strategic joint venture, with equity participation of 51% and 49%, respectively.
The successful implementation of the Wangchhu project is expected to strengthen confidence between the two shareholders and support the development of subsequent hydropower projects envisaged under the 5,000 MW umbrella memorandum of understanding.
Project officials said the milestone was achieved through collective efforts and support from the shareholders and the Board of Directors, the Chhukha Dzongkhag Administration, the Gewog Administrations, local communities, consultants, contractors, engineers, workers, and other stakeholders.
As the project enters an intensive construction phase, WHPL said it remains focused on three priorities: safety, quality, and timely delivery. The project will continue to maintain responsible construction practices with due regard for the environment and surrounding communities.
