The Units 3-4 of Lamtakong Pumped-storage Hydropower Plant, Phase 2, are ready to commercially supply electrical power as a hydropower battery for power security of the northeastern region.


         On December 30, 2019, the Units 3-4 of Lamtakong Jolabha Vadhana Power Plant, Phase 2, achieved their Commercial Operation Date (COD), resulting in total generating capacity of 1,000 MW of the 4 units.


         Mr. Somluck Petcharoen, EGAT Assistant Governor - Power Plant Engineering and Construction, said that the EGAT had installed the 2 pumped-storage generating units of Phase 1 with total generating capacity of 500 MW. Later, 2 more pumped-storage generating units were installed with total generating capacity of 500 MW, in accordance with the Power Development Plan 2010 – 2030 (PDP 2010). Approved by the Cabinet on February 27, 2013, the Units 3-4 were installed in order to meet the country’s peak load and to enhance the stability of the power system. The Lamtakong Pumped-storage Hydropower Plant, an eco-friendly power source, a tourist attraction and the biggest alternative hydropower battery in Southeast Asia, aims to response to the industry development in the Northeast.



         The Lamtakong Jolabha Vadhana Power Plant is the first and only underground power plant in Thailand. Using the excess power in the system to pump water to be stored on an upper reservoir during the off - peak demand period, it releases water to generate electricity to the system rapidly; when there is high electricity demand. It is considered a large hydropower battery in the Northeast, with maximum use of water resources due to water reused process in the Lamtakong’s reservoir.

         Among the current pumped-storage hydropower plants of EGAT are 360 MW Srinagarind Dam Hydropower Plant Units 4 - 5 in Kanchanaburi Province and 171 MW Bhumibol Dam Hydropower Plant Unit 8 in Tak Province. Moreover, EGAT is on the process of conducting a feasibility study to develop pumped-storage hydropower plants in various areas. One of the potential sites is Pumped-storage Hydropower Chulabhorn Power Plant with generating capacity of 800 MW, developed to be a clean energy source with highly efficient electric power management to support the country’s economic growth in the future, which is in line with the country’s policy on alternative energy development.