Language :

Project Overview

Houay Ho Power Company (HHPC) is an independent power producer (IPP) located in the Attapeu province, in the southern part of Laos. It is a 152 MW hydroelectric power plant and began commercial operation in 1999. The company operates in accordance with build, operate and transfer (BOT) agreement with Lao government, supplies electricity to EDL, and also exports electricity to EGAT, Thailand.

The Bolaven Plateau is located in the far south of Laos. It is an elevated area of some 5,000 km2, which extends over parts of Champasak, Saravan and Attapeu Provinces.

The southern and eastern parts of the plateau rim form a very steep escarpment, which changes elevation from about 1,000 to 1,200 meters above sea level over a distance of only a few kilometers. The escarpment is an excellent site for a high head power scheme.

Main Dam

Concrete Face Rockfill
79 m
1.11x106 m3


Reservoir area
37.0 km2
High Water Level
meters above sea level
Low Water Level
meters above sea level
Effective Volume
527x106 m3
Max. discharge
22.0 m3/s
Annual Rainfall (Average)
2,300 mm
Catchments area
192.0 km2


Installed Capacity
150 MW (75 MW x 2)
Small Turbine
2.1 MW
for Local consumption.
Type of Turbine
Gross Head
775.5 m
3,540 m
(Underground Pressure Tunnel)

Transmission Line

230 kV x 2 circuits
(over a distance 161 km to Thai/Lao Border)