Lam Takhong Dam

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Lam Takhong Dam
Lam Takhong Dam is located in Thailand
Lam Takhong Dam
Location of Lam Takhong Dam in Thailand
Official name เขื่อนลำตะคอง
Country Thailand
Location Nakhon Ratchasima Province
Coordinates 14°51′54″N 101°33′37″E / 14.86500°N 101.56028°E / 14.86500; 101.56028Coordinates: 14°51′54″N 101°33′37″E / 14.86500°N 101.56028°E / 14.86500; 101.56028
Status In use
Opening date 1974
Owner(s) Electricity Generating Authority of Thailand (EGAT)
Dam and spillways
Type of dam Earth core rockfill dam
Impounds Lam Takhong River
Height 40.3 m (132 ft)
Length 251 m (823 ft)
Creates Lam Takhong Dam Reservoir
Total capacity 310×10^6 m3 (251,321 acre·ft)
Power station
Operator(s) Electricity Generating Authority of Thailand (EGAT)
Commission date 2002
Turbines 2 x 250 MW reversible pump-generators
Installed capacity 500 MW
Annual generation 400 GWh

The Lam Takhong Dam (Thai: เขื่อนลำตะคอง; rtgskhuean lam ta khong) is an embankment dam on the Lam Takhong River between Pak Chona and Sikhio Districts in Nakhon Ratchasima Province, Thailand.[1] The dam was originally constructed in 1974 for the purposes of irrigation and water supply but after 2002, its water storage also serves as the lower reservoir for the Lam Takhong pumped storage power plant, Thailand's first power plant of that type.


Construction on the Lam Takhong Dam began in 1969 and was completed in 1974, while the pumped storage project was initially proposed in 1975.[2] From 1989-1991, the Japan International Cooperation Agency funded a feasibility study. Khon Kaen University conducted an environmental impact assessment beginning in 1991 and by 1994, the project was approved for construction. The project was to be constructed in two 500 MW phases. The first phase began in December 1995 and was completed in 2001, with the first two 250 MW generators operational in August 2002. After the 1997 Asian financial crisis, Phase 2 never began.[3] The power plant and its components were constructed underground to preserve the nature and scenery of the area. During construction, various complaints were raised about the blasting of the upper reservoir. The dust from blasting reportedly had negative effects on locals and their farms.[4]

Design and operation[edit]

The Lam Takhong Dam is a 251 m (823 ft) long and 40.3 m (132 ft) high earth-fill embankment dam. It creates a reservoir with a capacity of 310,000,000 m3 (251,321 acre·ft). The upper reservoir 17°14′31″N 99°00′58″E / 17.24194°N 99.01611°E / 17.24194; 99.01611 (Lam Takhong Upper Reservoir) is located 6.8 km (4 mi) southwest of the main dam on top of a hill. The upper reservoir is created by an asphalt lining 2,170 m (7,119 ft) long and 50 m (164 ft) high. It has a capacity of 10,300,000 m3 (8,350 acre·ft) and surface area of 0.34 km2 (0.13 sq mi). The power station is a pumped-storage type and contains two 250 MW reversible pump-generators. Water is a first pumped to the upper reservoir and then during peak-demand hours, it is sent back down to the power station for power production. This process repeats itself. The power station is connected to the upper reservoir via two 650 m (2,133 ft) long, 6 m (20 ft) diameter penstocks. Water returning from the power station does so via two 1,430 m (4,692 ft) long, 6.8 m (22 ft) diameter tailrace tunnels.[5]

In September 2014, EGAT awarded a US$64.3 million contract to Voith Hydro to supply eletromechanical equipment for the expansion of the facility. The expansion will more than double Lam Takhong's current output capacity. When complete, total capacity of the pumped storage plant will be 1,000 MW—500 MW from two units installed in Phase 1 and 500 MW from two units installed in Phase 2. The expansion is expected to be completed in 2018.[1]

See also[edit]


  1. ^ a b Ingram, Elizabeth (6 September 2016). "GE to provide equipment to upgrade Lam Ta Khong pumped-storage plant in Thailand". Retrieved 7 September 2016. 
  2. ^ "Lam Takhong Dam". Retrieved 6 March 2011. 
  3. ^ "Environmental Impact Assessment of the Lam Ta Khong Pumped Storage Project" (PDF). Mekong River Commission. Retrieved 6 March 2011. 
  4. ^ "Lam Ta Khong Pump Storage Project". Mekong Watch. Retrieved 6 March 2011. 
  5. ^ "Lam Ta Khong Hydropower Plant". Electricity Generating Authority of Thailand (EGAT). Retrieved 6 March 2011.