Salient Features

Salient Features Units Burgangchhu HPP Yungchhu HPP Suchhu HPP

Location

Dzongkhag Zhemgang Lhuentse Haa

Gewog Nangkor Maedtsho Sangbaykha

Nearest village Buli Onngar & Zhongmay Tshanglingna

Location Coordinate of Intake UTM 0281273, 3004997 0310026, 3051258 0711318, 3009696

Location Coordinate of PH UTM 0281754, 3002924 0314692, 3046475 0711166, 3005735

Hydrology and PPS

Catchment area km2 216 122.3 90

Design discharge m3/s 13.17 7.46 7.43

Lean discharge m3/s 4.27 2.51 1.37

Design flood m3/s 230 157 112

Net head m 462 483 273

Installed capacity MW 54 32 18

Firm power MW 14.34 8 2.92

Design energy GWh 260.51 157.6 76.57

PLF % 56 56 49

Project Components

Diversion Structures

Type Raised weir Raised weir Trench weir

Dimension (W x L) m 15.0 x 5.0 18.0 x 5.0 2.8 x 15.0

Desilter

Type Surface Surface Surface

Number of basins Nos 3 3 3

Length m 43 47 50

Depth m 4.6-5.7 3.9-5.5 3.2-4.9

Inlet gate size (W x H) m 3.25 x 1.20 1.50 x 1.40 1.5 x 1.6

Outlet gate size (W x H) m 2.00 x 1.20 1.00 x 1.50 1.0 x 1.7

SFT gate size (W x H) m 1.5 x 1.0 1.2 x 1.0 1.2 x 1.0

Water Conductor System

Surface Headrace Pipe

Length m 931 3626 3,556

Diameter m 1.9 2/1.9 2.0/1.9/1.8

Material ASTM 517 Grade F GRP GRP

Underground Headrace Pipe

Length m 1,566 2,580 1,004

Diameter m 1.9 1.9/1.8 2

Material ASTM 517 GRP GRP

Tunnel length m 1,365 2,580 1,004

Tunnel diameter m 4 m dia D shaped 4 m dia D shaped 4 m dia D shaped

Surge Shaft/Tube

Type UG Vertical Open to sky Surface Inclined

Length m 206 54 150

Diameter m 2.5 5.5 (finished dia) 2.2

Penstock

Type Surface Surface/Underground Surface

Length m 931 1584.5/83.5 475

Diameter m 1.9 1.5 1.5

Powerhouse

Type Surface Surface Surface

Dimension (L x W x H) m 38.60 x 20.80 x 25.30 38.00 x 21.00 x 16.00 33.00 x 13.90 x 15.50

Machine centerline m 802 1195 940

Machine floor level m 808.35 1192.4 938.5

Maximum Tailwater Level m 798.65 1191.4 936.8

Tail Race Channel

Number Nos 2 2 2

Type TRC TRC TRC

Length m 18 20

Dimension (W x H) m 1.8 x 1.8 1.5 x 1.5 1.8 x 1.8

Outlet invert m 797.5 1190 934

Gate size (W x H) m 1.8 x 1.8 1.5 x 1.5 1.8 x 1.8

Electro-Mechanical

Turbine

Number of units Nos 2 2 2

Type of turbine Vertical Pelton Horizontal Pelton Horizontal Shaft Pelton

Rated head m 462 483 273

Rated output MW 54 (2 x 27 MW) 32 (2 x 16 MW) 19 (2 x 9 MW)

Rated speed rpm 500 600 500

Efficiency % 92 91 91

Generator

Type of generator Vertical Shaft Horizontal Shaft Horizontal Shaft

Rated power MVA 30 18.82 10

Power factor 0.9 0.85 0.9

Generator terminal voltage kV 11 11 11

Number of phases Nos 3 3 3

Frequency Hz 50 50 50

Efficiency % 98 98 98

Power Transmission and Distribution

Transmission line voltage kV 132 132 33

Total line length km 9 7 3

Conductor type Panther Panther Wolf

Construction Schedule

Project construction Months 36 36 32

Cost and Financials

Project cost at December 2021 Million Nu. 3,565.25 3,660.00 2,095.00

Specific cost Million Nu. /MW 66.02 114.38 116.39