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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 area 66.9 square kilometres at normal level
Effective storage capacity 1.2 billion cubic metres
Catchment area 3,700 square kilometres
Average annual inflow 4.7 billion cubic metres or 148.4 m3/s
Nam Ngiep 1 Main Dam
Type Roller-Compacted Concrete Gravity Dam
Crest height 167 metres
Crest length 530 metres
Spillway Discharge Capacity (4 x radial gates) 5,210 cubic metres per second
Penstock Tunnel Length 185 metres
Penstock Tunnel Diameter 5.2 metres
Nam Ngiep 1 Main Powerhouse
Turbine and generator 2 Francis Units
Effective head 130.9 metres
Rated output 272 megawatts
Annual power generation 1,546 gigawatt hours
Transmission line 230 kilovolt line, 125 km to Nabong Substation
Nam Ngiep 1 Re-Regulation Reservoir
Reservoir surface area 1.27 square kilometres at normal level
Effective storage capacity 4,600,000 cubic metres
Catchment area 3,725 square kilometres
Nam Ngiep 1 Re-Regulation Dam
Type Concrete Gravity Dam
Crest height 20 metres
Crest length 90 metres
Discharge Capacity (fixed wheel gate) 5,210 cubic metres per second
Nam Ngiep 1 Re-Regulation Powerhouse
Turbine and generator 1 Bulb Unit
Effective head 12.7 metres
Rated output 18 megawatts
Annual power generation 105 gigawatt hours
Transmission line 115 kilovolt line, 40 km to Pakxan Substation