NAM CHIANE HYDRO POWER PLANT: 104 MW

PROJECT OVERVIEW

Nam Chiane 1 Hydropower Project is located at upper reaches of Nam Chiane River which is located at central Laos. The project area is located at the southern slope of Xieng Khouang Plateau, with terrain high in the north and low in the south. The elevation of the damsite zone is generally 900m~1300m, and changes to 500m~450m to the plant site in the south. Nam Chiane River is a tributary of Nam Ngiep River, flowing from the south to the north. The powerhouse is on the left bank of Nam Chiane River, being located at the contact zone where canyon is transiting to alluvial plain. The gross head of the hydropower project is about 600m. Headrace development is employed for the hydropower project, and the project area is located in Xieng Khouang Province.

The main task of the Project is power generation, and the power is consumed mainly in Xieng Khouang Province. The electric energy generated by Nam Chiane 1 Hydropower Project will be transmitted to the proposed Thavieng Substation, and then to the 230kV national power grid.

On August 2012, China Gezhouba (Group) Corporation (CGGC) submitted to Electricite du Laos (EDL) Feasibility Study Report of Nam Chiane 1 Hydropower Project in Laos (hereinafter referred as Feasibility Study Report) . After the report was approved by EDL and Lao Ministry of Energy and Mines, CGGC signed general contract (EPC) of Nam Chiane 1 Hydropower Project with Laos Government on December 2012.

LIST OF ENGINEERING CHARACTERISTICS

I. Hydrological conditions

  • Watershed area upstream the north dam site of Nam Chiane river: 281 km2
  • Watershed area upstream the south dam site of Nam Tong Sai river: 41 km2
  • Whole watershed: 322 km2
  • Mean annual flow of Nam Chiane River: 9.48 m3/s
  • Mean annual flow of Nam Tong Sai river: 1.42 m3/s
  • Total mean annual flow: 10.90 m3/s
  • North Dam
  • Design flood flow (P = 0.2%) : 1206 m3/s (Natural)
  • Checked flood flow (P = 0.02 %) : 1897 m3/s (Natural)
  • diversion flow: 85 m3/s (Dry season P = 10%)
  • South Dam
  • Design flood flow (P = 0.2%) : 461 m3/s (Natural)
  • Checked flood flow (P = 0.02 %) : 725 m3/s (Natural)
  • diversion flow: 220 m3/s (Full year P = 10%)
  • Mean annual sediment load of North Reservoir: 12.201 (10000t/y)

II. Reservoir

1.1 North Dam
  • Check Flood Level(P=0.02%): 1065.38 m
  • Releasing Discharge (P=0.02%): 1897.00 m3/s
  • Design Flood Level (P=0.2%): 1061.56 m
  • Releasing Discharge (P=0.2%): 1206.00 m3/s
  • Elevation of free overflow weir crest: 1061.00 m
1.2 South Reservoir
  • Check Flood Level(P=0.02%): 1062.63 m
  • Releasing Discharge (P=0.02%): 800.20 m3/s
  • Design Flood Level (P=0.2%): 1062.04 m
  • Releasing Discharge (P=0.2%): 533.60 m3/s
  • Normal pool level: 1060.00 m
  • Dead storage level: 1040.00 m
  • South reservoir’s full storage capacity: 23.12 x 10 6 m3
  • South reservoir’s regulating capacity (From normal reservoir level to dead water level): 12.70 x 10 6 m3
  • South reservoir’s dead storage(below dead water level): 7.96 x 10 6 m3
  • Design sedimentation elevation of south reservoir(30 years): 1001.68 m3

 

  • Storage capacity factor: 3.70 %

  • Incomplete annual regulation

III. Engineering performance indicators

  • Installed Capacity: 104 MW

Mean annual energy output: 451.33 GWh/year
  • Type: 2 x 53.61 MW (Pelton)
  • Rated speed of rotation: 428.6 rpm
  • Rated head: 533.00 m
  • Rated discharge: 11.43 m3/s
  • Type: Model: SF55-14/4850 (2 sets)
  • Rate Power: 52 MW
  • Rated capacity: 57.78 MVA
  • Generator power factor (lagging): 0.9
  • Rated voltage: 10.5 kV

Type: SF10-63000/121 (2 sets)

IV. Main structures and equipments

  • Type: Rockfill dam with clay core (RCC)
  • Foundation characteristics: Granite (Plinth foundation)
  • Bedrock peak acceleration: 1.08 m/s2 (10% probability of exceedance during 50 years)
  • Crest elevation/ breast wall top elevation: 1064.80/1066 m
  • Maximum dam height: 93.00 m
  • Dam crest length: 294.50 m
  • Type: Spillway (Positive slot type on the river bank, free overflow)
  • Foundation performance: Granite
  • Crest level: 1060 m
  • Free overflow weir length: 80 m
  • Energy dissipating mode: Ski-jump
  • Design sluice flow (P=0.2%): 533.6 m3/s
  • Check sluice flow (P=0.02%): 800.2 m3/s
  • Power generation design diversion flow: 22.86 m3/s

OPERATION AND MAINTENANCE TEAM ​

NC0001

CHANDA PHIATHEP

PLANT DIRECTOR

NC0002

LORFONG KIATOUKAYSY

DEPUTY PLANT DIRECTOR

OPERATION DIVISION

VIXAY SOUVANNASAN

OPERATION MANAGER

KEOVILAY BOUTTHAVONG

SHIFT CHARGE ENGINEER

SENGKHAM VANNALATH

SHIFT CHARGE ENGINEER

XAYSAVANG PHUBOUNPUK

SHIFT CHARGE ENGINEER

BOUNTHOM PHENGSIVILAY

DEPUTY SHIFT CHARGE ENGINEER

KEOOUDONE LUANGPHAN

OPERATOR

SITHONG DUANGBOUDDA

OPERATOR

KHAMVEUNE PHANTHAVONG

OPERATOR

KITA MUENKEOMANY

OPERATOR

SENGDAO SYSONGKHAM

OPERATOR

MAINTENANCE DIVISION

SOUKSAKHONE PHETSYSANAVONG

MAINTENANCE MANAGER

PHONEPASEUTH CHANTHAVONG

ELECTRICAL ENGINEER

THILAKONE LEUAMVATTHANA

MECHANICAL ENGINEER

THAVONE KEODOUANGOUDOM

ELECTRICAL FOREMAN

THEPSAVANH MOUNLADOK

CIVIL TECHNICIAN

XAYSAVARD PHUNTHAVONGXAI

CIVIL TECHNICIAN

CHANTHAVONG KEOKAEN

CIVIL ENGINEER

NOUBEE HEUVAXENG

STORE TECHNICIAN

KAIYASONE PAPHATSIN

ELECTRICAL TECHNICIAN

PHOUTHONG XAIYAPHON

ELECTRICAL TECHNICIAN

AMPHON BOUNPHONG

ELECTRICAL TECHNICIAN

PHIANTHONG SOUKPASEUTH

ELECTRICAL TECHNICIAN

XENGMOUA YONGPAOMOUA

MECHANICAL TECHNICIAN

SOUKINDA PHUANGCHANLA

MECHANICAL TECHNICIAN

SOMBOUN LENGSAVATH

MECHANICAL TECHNICIAN