Punatsangchhu-I Hydroelectric Project Authority (PHPA-I) is an autonomous body set up for implementation of 1,200MW Punatsangchhu-I Hydroelectric Project (PHEP-I), the mutually beneficial Indo-Bhutan friendship Project. The project’s implementation started on November 11, 2008.

Originating at an altitude of ±7,000 masl in Gasa Dzongkhag (District) of Bhutan and fed by snow/glacial lakes from the Great Himalayan Range, the rivers Phochhu and Mochhu join at an altitude of ±1,200 masl at the iconic Punakha Dzong (Fortress) to form the Punatsangchhu river which then flows southerly to enter the Indian plains as Sankosh.

Confluence of Phochhu and Mochhu river near Punakha Dzong

Confluence of Phochhu and Mochhu rivers (El. 1212.2m) near Punakha Dzong

This run-of-the-river Project located by the  7-21 km stretch of Wangdue-Tsirang National Highway in Wangduephodrang Dzongkhag in Western Bhutan is the first project under the 10,000MW Hydropower Development Initiative undertaken by the Royal Government of Bhutan (RGoB) and the Government of India (GoI). Designed to generate 5,670 million Units of electricity in an average year, the Project utilizes 357 m of head available in about 11 km length of Punatsangchhu river. The Dam site is about 7 km downstream of Wangdue Bridge and all other project components are located on the left bank of the river between 7 km and 21 km downstream of the  Wangdue Bridge.

Latest News & Events

June 2, 2021: Social Forestry Day

The Management of PHPA-I along with the EICs and Heads of Circles and Divisions commemorated the 2nd June Social Forestry Day by planting 250 fruit saplings near this Executive Hostel and on the sides of the road between E and F type buildings. The fruit species planted are Guava (imported pink and white varieties), Pear, Peach, Avocado, Persimmon, Lime, Walnut, Pomelo, Humpa, Passion fruit, Orange (imported), Chestnut etc.

Punatsangchhu-I Hydroelectric Project Authority (PHPA-I) and Bhutan Automation, a subsidiary company of Druk Green Power Corporation, signed a contract agreement for the design, engineering, manufacture, supply, erection, testing, and commissioning of the complete computerized control and protection systems of 1200MW project yesterday. After the completion of the project worth Nu. 398 million, the entire power plant can be controlled remotely using these systems.


Recitation of 100,000 Sangay Menlha (Medicinal Buddha)/Dewachen Gi Menleom (Buddha Amitabha Prayer).

The Bhutanese employees working in Punatsangchhu-I & II Hydroelectric Projects being executed in Wangdue Bhutan through the financial assistance of GoI came forward voluntarily to recite 100,000 Sangay Menlha (Medicinal Buddha) and Buddha Amitabha prayers on 06.05.2021 coinciding with the auspicious 25th Day of Third Bhutanese month.read more>>>

Recitation of  Sangay Menlha (Medicinal Buddha)/Dewachen Gi Menleom (Buddha Amitabha Prayer).


Lyonpo Loknath Sharma

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The Main Civil Works of the project has been divided into three packages: MC-1, MC-2, MC-3.