Nam Ngum 2 Dam Hydropower Info

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Nam Ngum 2 Hydroelectric Power Project is located near Ban Huay Bor, 90 kilometers north of Vientiane and 35 kilometers upstream of the Nam Ngum 1 reservoir. The project is owned and managed by Nam Ngum 2 Power Company Limited (NN2PC) which is 75% owned by SouthEast Asia Energy Limited and 25% by EDL-GEN.

Nam Ngum is pronounced like "Nam Nyum".

SouthEast Asia Energy Limited is a subsidiary of CK Power PCL (CKP) which was established by Chor. Karnchang PCL (Chor. Karnchang Group). Thai-based Ch. Karnchang PCL is the largest shareholder in SouthEast Asia Energy Ltd.

Nam Ngum 2 project was the first wholly Thai-financed and developed independent hydropower project in Lao PDR.

Nam Ngum 2 Dam and Reservoir images below:

The Nam Ngum 2 hydroelectric dam is a concrete-faced rockfill dam 485 meters wide and 181 meters high. The dam features two concrete-lined diversion tunnels and three Francis turbines. The dam structure is built in a steep narrow gorge creating a reservoir with a surface level at 375 meters above sea level.

The installed capacity of the project is 615 megawatts with annual production capacity of 2,220 GWh. Electricity produced from the project is sold to Electricity Generating Authority of Thailand pursuant to a Power Purchase Agreement for a period of 25 years.

Construction of Nam Ngum 2 began in late 2005 and was completed in 2011. Thai-based Ch. Karnchang PCL handled construction of the project. This was the first independent power producing project in Laos to be wholly developed and financed by Thai-based organizations.

Nam Ngum 2 dam location satellite image below:

Nam Ngum 2 dam site satellite image below at coordinates 18°45'10.8"N 102°46'37.2"E (18.753, 102.777) :

Toshiba Energy Systems and Solutions was selected as the turbine supplier for the project. The company provided 3 units of Francis turbines, each with 205 MW nameplate capacity for combined 615 MW.

Mitsui supplied 3 electric generators for the project.

Right Tunneling Public Co. Ltd. handled construction of tunneling for diversion, outlet works and power waterways.

Nam Ngum 2 Hydropower Plant components below:
• Two diversion tunnels 12 meters in internal diameter located on the left abutment
• A gated spillway with chute and flip bucket on the right abutment
• A concrete face rockfill dam 182 meters high
• A single headrace tunnel with intake facility in the left abutment
• Powerhouse building with 3 turbine-generator units having a total installed capacity of 615 MW
• Main transformers located on the hill side of the powerhouse
• A GIS switchgear integrated into the powerhouse
• A 230 kV / 500 kV transmission line system 96 km long

Nam Ngum 2 project is possibly co-owner of the Nabong Substation along with EDL and both benefit from wheeling fees charged to other hydropower projects that use their transmission line and equipment for power exported to Thailand (such as Nam Ngiep 1 and maybe Nam Ngum 3).

Nam Ngum 2 reservoir image below: