The first two turbine-generator units are now operating at the 1,020 MW Punatsangchhu-II Hydroelectric Project (PHPA-II), 13 years after the intergovernmental agreement between Bhutan and India was signed.

This signals the commissioning of one of the most eagerly anticipated mega hydropower projects in the country, Druk Green Power Corporation said. The next phase will involve integrating these turbines with the electrical and communication systems, leading to full-scale energy production.

Energy and Natural Resources Minister Gyem Tshering, who attended the celebration ceremony, described the event as a landmark moment that marks the beginning of a new chapter in the shared journey of Bhutan and India toward completing this project.

The project, initially scheduled for completion in 2017, faced delays due to geographical challenges, flash floods, the COVID-19 pandemic, and the discovery of a significant shear zone at the dam foundation.

Tshering said that what started as a bold vision has now become a reality, showcasing the strength and depth of the partnership. “This achievement is a powerful reminder of what can be accomplished through cooperation and shared vision. It stands as a testament to our commitment to sustainable development, energy security, and the enduring friendship between our nations,” he added.

This is the first time a Francis turbine has been used “for a mega project” in the country, as all existing hydropower plants currently in operation use Pelton turbines, the company said.

By December, all six turbines are expected to be operational and will start feeding power into the grid.

The project, with an estimated cost of Nu 94.45 billion (US$1.1 billion), has already achieved several key milestones, including the reservoir filling on Feb. 21, filling of the headrace tunnel on June 27, the tailrace tunnel on Aug. 2 and the pressure shaft on Aug. 12.

The Punatsangchhu-II project is jointly implemented by the Bhutanese government and the government of India. Once the project is fully commissioned, Bhutan will again surpass power capacity of Nepal.