Rajjaprabha is a 240 MW hydro power station in Surat Thani, Thailand. It is operated by Electric Generating Authority of Thailand. Based on its capacity (estimated), it can supply roughly 240k homes (estimated). It ranks #53 of 238 Thailand power plants by installed capacity. Commissioned in 1987, it is around 39 years old — long-established. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 4.0% of Thailand's electricity; the national grid averages 546 gCO₂/kWh (16.6% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1000174.
Data status
Known data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Source of the capacity and fuel values:
capacity: GEM · 2026 · L100000603572; fuel: WRI GPPD
In context: how this plant compares
At 240 MW, Rajjaprabha is below the median hydro plant in Thailand (300 MW). Technically it is described as conventional storage. Hydropower converts the energy of falling or flowing water into electricity; output depends on rainfall and reservoir level, and large dams also provide grid balancing and storage.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Key facts
- Share of Thailand hydro capacity
- 6.0% of 3,994 MW across 10 plants in this dataset
- Age among peers
- 7 of 10 dated hydro plants in Thailand are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Capacity vs largest hydro plants in Thailand
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Electric Generating Authority of Thailand. All plants by this company →
Local climate & thermal context
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a tropical monsoon climate (Köppen Am) — Northern Hemisphere, latitude 9.0°N — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
This site has effectively no heating season (tropical/equatorial climate), so winter heat loss is not the driver here. The thermal concern shifts to year-round process heat and humidity/heat-driven corrosion of hot equipment.
Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.
Site climate & environmental severity
This site sits in a corrosive environment (estimated ISO 9223 class C4 — High), with humidity / wetness the leading environmental stress.
Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.
How it compares & nearby plants
The #6 largest hydro power plant of 10 in Thailand by capacity.
Thailand has 10 hydro power plants in this dataset, together about 3,994 MW of capacity.
Nearby power plants
- Surat Thani · Gas · 244 MW · Surat Thani
- Surat Thani Solar Power Plant · Solar · 1 MW · Surat Thani
- Surat Thani Green Energy Co. Ltd. · Biomass · 8.8 MW · Surat Thani
- Krabi coal power station · Coal · 870 MW · Krabi
- Krabi · Gas · 315 MW · Krabi
- Khanom · Gas · 970 MW · Surat Thani
Location
Coordinates 8.9723, 98.807 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Rajjaprabha?
Rajjaprabha is a 240 MW hydro power plant in Surat Thani, Thailand, commissioned in 1987.
Who operates Rajjaprabha?
Rajjaprabha is operated by Electric Generating Authority of Thailand.