Lamtakong Jolabha Vadhana Power Plant
Characteristics of the Power Plant
Lamtakong Jolabha Vadhana Power Plant is a pumped-storage power plant which is the first and the only underground power plant in Thailand. It was built about 350 m below the ground, with 23 m of width, 175 m of length, and 47 m of height to increase the distance from the reservoir on the hill to the powerhouse to intensify the water flow.
The upper reservoir on Khao Yai Thiang is a rockfill covered with asphalt to prevent water seepage. The reservoir capacity is 10.3 million m3 and the water surface area is 0.34 km2.
At present, Lamtakong Jolabha Vadhana Power Plant has the contractual generating capacity of 1,000 MW using hydropower from the reservoir of Lamtakong Dam in electricity generation.
| Type of power plant | Hydropower plant |
| Contractual generating capacity | 1,000 MW |
| Generating capacity of Units 1-4 (per unit) | 250 MW |
| Energy | Water |
| Special characteristics | Pumped-storage hydropower plant |
Transmission system
The first phase: using transmission line of 230 kV, four-circuit, connecting with transmission line of 230 kV of Saraburi 2 Substation and Nakhon Ratchasima 2 Substation at a distance of 15 km
The second phase: using transmission line of 230 kV, double-circuit, connecting with Tha Lan 3 Substation at a distance of 95 km.