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Specification

Main Dam and Main Powerhouse

Main Dam and Main Powerhouse

Regulation Dam and Powerhouse

Regulation Dam and Powerhouse

 

Nam Ngiep 1 Main Reservoir
Reservoir surface area66.9 square kilometres at normal level
Effective storage capacity1.2 billion cubic metres
Catchment area3,700 square kilometres
Average annual inflow4.7 billion cubic metres or 148.4 m3/s
Nam Ngiep 1 Main Dam
TypeRoller-Compacted Concrete Gravity Dam
Crest height167 metres
Crest length530 metres
Spillway Discharge Capacity (4 x radial gates)5,210 cubic metres per second
Penstock Tunnel Length185 metres
Penstock Tunnel Diameter5.2 metres
Nam Ngiep 1 Main Powerhouse
Turbine and generator2 Francis Units
Effective head130.9 metres
Rated output272 megawatts
Annual power generation1,546 gigawatt hours
Transmission line230 kilovolt line, 125 km to Nabong Substation
Nam Ngiep 1 Re-Regulation Reservoir
Reservoir surface area1.27 square kilometres at normal level
Effective storage capacity4,600,000 cubic metres
Catchment area3,725 square kilometres
Nam Ngiep 1 Re-Regulation Dam
TypeConcrete Gravity Dam
Crest height20 metres
Crest length90 metres
Discharge Capacity (fixed wheel gate)5,210 cubic metres per second
Nam Ngiep 1 Re-Regulation Powerhouse
Turbine and generator1 Bulb Unit
Effective head12.7 metres
Rated output18 megawatts
Annual power generation105 gigawatt hours
Transmission line115 kilovolt line, 40 km to Pakxan Substation