Nam Sak Dam Hydropower Info by Hobo Maps- Go to Hydropower Projects Page - - Home

Nam Sak Dam Hydropower project is near Ban Hine Toc south of Muang Moc (Mok) in Thathom District of Xieng Khouang Province. Thathom District at one time was in Xaysomboun Province but in 2006 it was transferred to Xieng Khouang Province. The Nam Sak project is close to Nam San 3A & 3B hydropower projects.

Construction site location in image below is at coordinates - 19°06'57.3"N 103°42'05.6"E (19.115917, 103.701556).

The project is developed by Phongsupthavy Group with output planned for export to Vietnam when the project is finished.

Nam Sak plant site images below:

In September 2021 there was signing of a contract for the electro-mechanical works. Andritz Hydro provided 3 turbine-generator units of 7.33 MW each for a combined capacity of 22 MW. The contract includes design, engineering, supply, transportation of main inlet valves, turbines, generators, control system, 11 kV MV switchgear and plant auxiliaries, including supervision of installation and commissioning. Generator installation commenced in April 2025 with hope for completion by the 3rd quarter of 2025.

Nam Sak HPP is a run-of-river style project.

The project has high potential head of 811 meters.

The penstock is about 3558 meters long with wall thickness varying from 8 mm to 28 mm.

Nam Sak controls image below:

Nam Sak site images below from early time of construction.

Various news reports in June 2021 reported that Electricity of Vietnam (EVN) has just exchanged power purchase contracts with a series of hydropower plant investors in Laos. EVN exchanged power purchase contracts with Phongsubthavy Group for the Nam Yeuang hydropower plant cluster, the Nam Mo 2 project, Nam Tai, Nam Sak, Nam Sao and Nam Chao hydroelectric plants.

A Power Purchase Agreement (PPA) with EVN was signed on 28 June 2021 for sale and export of output from Nam Sak to Vietnam.

Nam Sak output would be transmitted to Nam Mo 2 station and about 100 km distance of transmission line from Nam Mo 2 station to Tuong Duong station in Vietnam. This line will need to be synchronized with the Vietnamese grid

Map below has old info from early long-term planning.

Nam Sak connects to transmission line for export to Vietnam in map below. See enlarged version HERE.

Satellite image map below for Nam Ngiep River Basin hydropower projects: