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TRISHULI JAL VIDHYUT COMPANY LIMITED

UPPER TRISHULI 3B HYDROELECTRIC PROJECT (42 MW)

Powerhouse Site

Volume I

Executive Summary

Prepared by:

Trishuli Jal Vidhyut Company Limited

Sohrakhutte, Kathmandu

Ph : 4363681, Fax No. 4363681, P.O Box 6464

Date: October 2013

Detail Project Report of UT3B HEP

ES-i Trisuli Jalvidyut Company Limited

Salient Features of Upper Trisuli 3B Hydroelectric Project:

Project Location

Latitude of Project Area 27o59’12” N to 28o01’54” N

Longitude of Project Area 85o10’11” E to 85o12’01” E

Project area VDC Manakamana VDC of Nuwakot District and

Lahare Pauwa VDC of Rasuwa District

District Nuwakot and Rasuwa

Access

Access to Powerhouse site from Betrawati Bazar 3 km (gravel Road)

Road from Powerhouse to Intake 5 km (gravel Road)

Project road 1.447 km (to be constructed)

Hydrology

Total Area upstream of intake site 4577 km2

Total Area upstream of Powerhouse site 4605 km2

Highest point of the catchment 7406 m (Ganesh Himalaya)

Long-term annual average flow 53.2 m³/s

40 % Exceedance flow 111.4 m³/s

90 % Exceedance flow 36.0 m³/s

1:100 years flood at Intake area 2718 m³/s

1:100 years flood at Powerhouse site 2880 m³/s

Compensation flow 3.8 m³/s

Design flow (71 % exceedance flow) 51 m³/s

Geology

Headrace intake portal area Gneiss

Tunnel alignment rock type Dominant rocks are quartztic and schist and

small portion of gneiss

Lining type in headrace tunnel 46 % shotcrete lined and 54 % concrete lines

Tunnel rock mass classification Class II to V, fair to poor

Surge tank and penstock area (rock) Quartztic and schist, rock class III and IV

Powerhouse Area Alluvial and colluvial deposit quartztic and

schist at 30 to 40 m depth


ES-ii Trisuli Jalvidyut Company Limited

Tailrace Colluvial and Alluvial deposit

ERT of project area

Diamond Core Drilling

2.180 km

250 m(I-Phase) and 195 m (II-Phase)

Geological rating of the project Good to fair

Intake Portal (Tailrace of UT3-A)

Type of headrace intake portal Bell mouth

Bottom level of portal 712.2 m

Size (L x B x H) 90.5 m x 10 m to 27.5 m x 5 m to 13.8 m

Submergence depth 6.0 m

Headrace Pipe Intake

Type of pipe intake Bell mouth

Invert level of intake 713.90 m

Gate type Vertical lift fixed wheel and stoplogs

Size of Gate 5.1 m x 5.1 m square

Headrace Pipe

Concrete square box duct 5.1 m x 5.1 m

Length of duct before headrace pipe 20 m including 5.1 m bell mouth length

Circular headrace pipe length 364.27 m

Diameter of headrace pipe 5.1 m

Headrace Tunnel

Item Description Length (m) Internal

Diameter (m)

Shape Lining thickness

(mm)

Shotcrete lined 1723.43 6.6 Horse shoe 100

Concrete lined(before

surge tank)

2021.27 5.5

Circular

S3, S4 =400

and S5 = 450

Total length 3744.69

Adit Tunnels

Item Description Length (m) Internal

Diameter (m)

Shape Lining thickness

(mm)

Adit near Sukaure

Khola

463.3 4.0 D 100 mm, Shotcrete


ES-iii Trisuli Jalvidyut Company Limited

Adit to Headrace

tunnel near S/Tarea


Ventilation Adit to

Surge Tank


Access to valve

chamber


Surge Tank

Diameter 15 m

Height 37.4 m

Lining thickness 700 mm concrete

Level of surge tank crown El 747.4 m

Bottom Elevation of surge tank El. 710.0 m

Pressure tunnel after surge tank

Diameter 4.2 m (circular)

Length 98.17 m

Thickness of concrete lining 300 m

Pipe thickness 12 mm

Valve Chamber

Diameter of valve 3.5 m (circular)

Length x width x height 15.4 m x 7.0 m x 11.9 m

Lining 300 m concrete and 100 mm shotcrete

Drop shaft/ vertical shaft


Length 69.07 m(including bends)

Lining 300 m concrete and 100 mm shotcrete

Pipe thickness 12 mm to 18 mm

Pressure tunnel after drop shaft


Length 181.65 m

Thickness of concrete lining 300 m concrete and 100 mm shotcrete

Pipe thickness 18 mm


ES-iv Trisuli Jalvidyut Company Limited

Powerhouse

Length x width x height 37.6.0 m x 14.0 m x 26.9 m

Center line of Turbine El 623.5 m

Invert Level of Draft Tube El 618.2 m

Tailrace

Length x width x height 123.93 m

Size of Tailrace conduit 4.5 m x 4.5 m

Size of tailrace pond Width =5.5m to 20 m, Length= 20 m

Turbine

Number of generating units 2

Turbine Type Francis (vertical axis)

Turbine capacity 2 *21 = 42 MW

Turbine efficiency 92.0%

Speed 375 rpm

Runway speed 562.5 rpm

Transmission (132 kV)

UT3B HEP power will evacuated to

Integrated Nepal Power System (single

circuit) at Upper Trisuli 3A Hub Sub-station

3 km

Switchyard

Length x breadth 80 m * 60 m

Transformer

Type outdoor

Rating 25 MVA

Frequency 50 Hz

Number of units

Transformer efficiency

2

99 %

Generator

Rating 21 x 2 = 42 MW

Speed 375 rpm

Number of poles 16


ES-v Trisuli Jalvidyut Company Limited

Frequency 50 Hz

Number of Units 2

Rated voltage

Generator efficiency

11 kV

96 %

Power and Energy (at design discharge)

Gross Head 99.31 m

Net Head 95.13 m

Installed capacity 42 MW

Dry season energy 94.54 GWh/year

Wet season energy 243.34 GWh/year

Average energy 337.88 GWh/year

Environmental Study

Downstream release (compensation flow) 3.84 m³/s

Household affected (indirectly) by intake 47

Land acquisition by the project 7.0 ha (approximately)

Number of household to be relocated 9

Construction Period

Construction period from award of civil

contract

4 years

Economic Indicators (based on 2013 October, price level)

Project cost with tax, vat, price contingencies NPr 7040,982,060

Cost per kW (financial ) NPr 20.43 crore

Dry season energy benefit NRs 4.5 /kWh (US$ 0.0473 /kWh)

Wet season energy benefit NRs 4.5 /kWh (US$ 0.0473 /kWh)

Specific energy per kWh NPr 2.81 /kWh

Internal rate of return 15.36 %

B/C ratio at discount rate of 10% 1.55

Financial Indicators (based on 2013 July, price level)

Project Financial cost NPr 7745.08 Million

Energy Price on COD

Dry season energy US$ 0.0473 /kWh


ES-vi Trisuli Jalvidyut Company Limited

Wet season energy US$ 0.0473 /kWh

Escalation 3 % per annum (simple)

Number of years for escalation 9

Debt:Equity 70:30

Debt Amount NPr 5421.55 Million

Interest on debt 10 %

Loan repayment period 8 years

Royalties as per Electricity Act, 1992

capacity royalty for years 1 - 15

capacity royalty for years 15 onwards

energy royalty for years 1 - 15

energy royalty for years 15 onwards

NRs 100 per kilowatt per year

NRs 1000 per kilowatt per year

2% of electricity sales revenue

10% of electricity sales revenue

Financial rate of return 17.23 %


ES-1 Trisuli Jalvidyut Company Limited

Executive Summary

ES-1 Introduction

Nepal is entering a phase of major development in Hydropower sector. The present total installed

capacity of the Integrated Nepal Power System (INPS) is nearly 719.6 MW and the power demand

is gradually increasing at the rate of approximately 9 % a year. The annual peak demand of the

integrated Nepal Power System (INPS) in fiscal year 2012/13 is estimated to be 1094.62 MW with

375 MW power estimated to have been shed. In order to meet the increasing power demand in an

efficient manner, there is an urgent need to promote medium sized hydropower projects that can be

implemented at the earliest.

Four run off river schemes namely Rasuwagadhi (111 MW), Upper Trishuli-1 (216 MW), Upper

Trisuli 3A (60 MW) and Upper Trisuli 3B (42 MW) have been identified in the Upper Trishuli basin

located between Rasuwagadhi and Betrawati. Upper Trisuli-3B HEP with a capacity of 42 MW a

tailrace scheme of Upper Trishuli 3A HEP. This project was identified by NEA engineering

services in 2004/05 as part of Project Identification Study. The feasibility studies have been

completed in the year 2007/08. The project is located in Nuwakot district of Bagmati zone with the

intake site lying approximately 9 km north of existing Trishuli plant diversion weir near the

tailrace of Upper Trisuli 3A HEP. The powerhouse is located at Champani Village which is 4 km

south of the proposed headwork.

Main objective of the present study is to carry out a Detailed Project Report of Upper Trisuli-3B

HEP which would provide the information necessary for project development as EPC contract. The

recent action plan prepared for generation expansion has recommended Upper Trisuli 3B HEP as

one of the most attractive scheme for development.

ES-2 Topography Survey

Trisuli Jalvidyut Company Limited (TJVCL) carried out the detailed topographical mapping of

headwork, tunnel intake, surge shaft, penstock pipe, pressure tunnel, powerhouse area and tailrace



area were carried out in 1:500 scale with contour interval of 1m. The project layout map was

prepared in 1:5,000 m scale. Control point monumentation have been carried out for the

construction control points

ES-3 Hydrology

Trishuli River originates from China (Tibet) with 80% of the catchment area also lying in China.

The main purpose of hydrological study is to collect and analyze the parameters required for

the design of the project. The catchment area of Upper Trishuli 3B at intake is 4577 km2 while

that of Upper Trishuli 3A HEP is 4245 km2.

Long term daily flow has been estimated at the intake site of Upper Trisuli 3A HEP based on the

catchment area ratio. The hydrological analysis has been made based on the Betrawati gauging

station data during 1967-2005 and measurements carried out at the project site. Discharge

measurements have been carried out in the Trishuli River and in the tributaries (Phalanku &

Salankhu Khola) by a team comprising of NEA and DHM personnel. No major tributaries falls

between Upper Trisuli 3A HEP and Upper Trisuli 3B HEP, the discharge data in Upper Trisuli 3A

HEP is considered same as the Upper Trisuli 3B HEP for the energy Estimate. Sediment study has

also been carried out at Pairebesi during wet season. The recommended flood is 1:1000 year return

period. The flood at dam site and at the powerhouse site are 4030 m3/s and 4054 m3/s respectively.

.

ES-4 Geology and geotechnical study

NEA has conducted detailed studies to explore the surface and sub-surface geological condition of

the project area. A total of 250 m of core drilling has been carried out at 7 drill points. Seismic

survey of 2.7 km length has also been carried out at the project site during the feasibility study.

Similarly, additional 195 m core drilling were carried out at the alternative powerhouse site during

the detail project study. Detailed sub surface geological maps have been prepared. Most of the

project area has good to fair geology. The predominant rock types are Gneiss and Schist. The

headworks is located in river terrace deposit with rock in the left bank. It is envisaged that 54

% of the headrace tunnel length will be provided with concrete support while the remaining 46 %

length will have shotcrete support. Minimum rock cover in the headrace tunnel is 88 m. Drilling



results indicate that the surge shaft, powerhouse are situated in bedrock. The entire length of tailrace

tunnel is located in terrace deposit.

ES-5 Optimization Studies

Since Upper Trisuli- 3B HEP is tailrace development of Upper Trisuli 3A HEP, the design

parameters are governed by the upstream project. Project l a y o u t o ptimization study has been

carried out so as to recommend the most effective alternative options. During the layout

optimization, all the individual structure have been optimized, which are headrace pipe, headrace

tunnel, surge tank, drop shaft, and pressure tunnel section. The best alternative are choosen based

on the highest net returns in the long run. Upper Trisuli-3B HEP utilizes a gross head of 99.31 m

and design discharge is 51 m3/s which corresponds to about 70 % exceedance flow.

ES-6 Project Layout

Major structures of the proposed project are as follows:

ES-6.1 Access Road

Presently road access is available to the intake and powerhouse site of Upper Trisuli-3B HEP.

Gravel road from Betrawati Bazar to Upper Trisuli 3A HEP has been already in operation via Upper

Trisuli 3B HEP powerhouse area and Headworks area. Similarly, road from Tupche Bazaar to New

Bridge (installed by Upper Trisuli 3A HEP) passes through the construction adit to surge tank of

Upper Trisuli 3B HEP. During the construction, about 1447 m of new project road will have to be

constructed.

ES-6.2 Head Pond and Intake

The pondage area located immediately downstream of the tailrace outlet for Upper Trisuli 3A

Hydroelectric Project will act as the tailrace pond for this project and will function as the headpond

for Upper Trisuli 3B Hydroelectric Project. The intake portal or head pond is downstream of Upper



Trisuli 3A HEP connected to the headrace pipe of UT3B HEP. The surface area and volume of

head pond adopted is 1888.6 m2 and 11200 m3 respectively.

ES-6.3 Waterways

From the UT3A HEP tailrace pond to inlet of UT3B HEP, steel pressure pipe with concrete cover

has been adopted in the design. The pressure pipe is covered by structural concrete box of

pentagonal shape. The headrace tunnel passes mainly through Gneiss rock. The 3.744 km long

headrace tunnel has a finished diameter of 5.5 m for concrete lined and 6.6 m for shotcrete

lined sections. The headrace tunnel will have horse shoe type excavated section and circular finished

section 52.79 % of the headrace tunnel is envisaged to be provided with concrete lined while the

remaining 47.21 % will have shotcrete lined. The headrace tunnel will have two adits, one at

Chainage 1+771.3 and second at chainage 4 + 060.75. The third adit tunnel is the ventilation

adit at the surge tank. The restricted orifice surge shaft will have a diameter of 15 m and height

of 37.4 m.

The horizontal portion of the tunnel located immediately downstream of the surge tank is circular

in shape and is basically a continuation of the headrace tunnel. It is 98.17 m long and has 14 mm

steel lined. The valve chamber is at 31.3 m distance from surge tank. The cavern size of the

valve chamber is 15.4 m long, 7 m wide and 11.9 m height which is accessible through adit no. 2.

The valve chamber is equipped with the butterfly valve and its diameter is 3.5 m.

Total length of vertical shaft is 69.07 m including the bends. The steel lined thickness varies from 14

mm to 18 mm at end of drop shaft. The diameter of horizontal pressure tunnel and vertical drop

shaft is 4.2 m. The horizontal pressure tunnel from the end of drop shaft to the penstock bifurcation

is 181.65 m. The thickness of steel lined is 18 mm along the horizontal pressure tunnel. The shape

of the excavation along the horizontal pressure is D-shape and finished diameter is the circular.

The box duct tailrace tunnel is 123.93 m long and has a size of 4.5 m x 4.5 m.



ES-6.4 Powerhouse

The powerhouse is located in cultivated terrace with Gneiss bed rock. The semi-surface

powerhouse is located near existing road. The powerhouse has a dimensions of 37.6 m x 14 m x

26.9 m (L x B x H) with the turbine floor level at 625.35 masl. It will accommodate of two vertical

shaft Francis turbine generators each of 21 MW installed capacity and its ancillary facilities. The

surface switchyard will be located in front of the powerhouse, the size of switch yard is 40 m x 80 m.

ES-7 Power Evacuation

For the power evacuation of the project, the transmission line is connected to NIPS at the Trisuli 3B

hub. The transmission line length to Trisuli 3B hub substation 220/132 kV is 3 km and north of the

powerhouse site. The transmission voltage is 132 km and conductor is ACSR "WOLF" conductor

single circuit.

ES-8 Environmental Considerations

Environmental and Social Studies Department of NEA has made site study and prepared Scoping &

Terms of Reference of the EIA as per Environment Protection Rules. NEA has received the

approved TOR and scoping on November 2010. The draft EIA report has already submitted to

Ministry of Environment and awaited for the final approval. Upper Trishuli 3B HEP is a medium

sized cascade run of river project and does not require separate headwork and desander. All the

project structures are in the right bank and most of the structures are of underground in nature.

Minimum release of at least 3.84 m3/s shall be made available through Upper Trisuli 3A HEP.

Based on the present level of study, the adverse environmental impacts are nominal as only a few

households will be affected. The main impacts associated with the project will be the decrease in

river discharge between the intake and the powerhouse in the dry season and acquisition of

agricultural land for construction. This scheme will provide the much needed renewable energy

in the present power system which is facing acute shortage of power. The power generation

from this project will enhance the macro economic growth and increase income to the government

through royalty. It will also have much positive benefits like improvement in local economy,

employment opportunities, infrastructure development etc.



ES-9 Power and Energy

Discharge, head and the efficiency are the prime factors responsible for the power generation from

a plant. As the project is a run off the river cascade type, there is no provision of storage. Hence,

energy generation is directly proportional to the discharge rate. Annual 90 % dependable flow is

assumed to be the firm flow and is responsible for firm power and firm annual energy. This project

will produce 42 MW of power for nearly 8.5 months of the year and the minimum power generation

in the dry season will by 29.19 MW.

Gross head of the project between head pond and tailrace is estimated at 99.31 meter. Average head

loss corresponding to the design discharge is estimated to be 4.18 meter. The overall efficiency of

the power plant is assumed to remain constant throughout the year and is equal to 88.25 %. This

value corresponds to the transformer efficiency of 99.0%, generator efficiency of 96.0% and turbine

efficiency of 92.85%. Total outage of 3% has been assumed for the energy generation estimate.

Total gross annual energy of 337.88 GWh has been estimated for this study. This value is based on

the average monthly flow. Annual dry season energy (November-April) is estimated to be 94.54

GWh where as wet season energy is 243.34 GWh. The saleable energy is estimated at 337.88

GWh/annum.

ES-10 Construction Planning

The objective of construction planning is to accomplish the project within the estimated time and

budget. Firstly, preparatory works like project road, construction camp & power shall be made.

The construction power requirement of about 1.0 MW will be supplied through the existing 33 kV

line connected with Trishuli substation. Construction methods for the various project components

like intake pond, tunnel, surge tank, penstock pipe, powerhouse, tailrace have been proposed in a

manner that is friendly to the environment. The headrace tunnel which is the critical component

of construction will be excavated through 4 working face using three adits. Thus the maximum

length of tunnel from a face is 1906.7 m. One more construction adit will be required for the surge

tank. Construction schedule has been prepared taking into account the sequencing of various tasks

and time required for each task. It is envisaged that the actual construction of the project can be



completed in nearly 4 years. Thus this project can be completed by the middle of the year 2018 if

preparatory works are taken at earliest and construction is given due priority.

ES-11 Cost Estimate

The project cost estimate is based on quantity estimates from the design and unit rate analysis of all

the major work items. The following criteria and assumptions are the basis of the cost

estimate:

• All costs are based in the year July 2013 price level.

• For currency conversion the exchange rate of 1 US $ = 95 Rs. has been adopted.

• Identifiable Nepalese taxes and custom duties are included.

• Royalties are taken as per the GoN rule and regulation.

Contingencies were applied to various areas of work to cover changes in physical scope. For the

present level of studies the following allowances were applied:

• 10 % on civil works(underground and Surface)

• 5% on Electro-mechanical equipment, and Transmission works

• 1.5 % Tax and duties

• 7.5 % Price contingencies

• VAT @ 1% (E/M, H/M &Transmission Line) & @13% in others

A sum of 10 % of the cost is provided for engineering, management and administration during

construction. The total project cost for installed capacities of 2 X 21 MW is NPr 7040.98 million.

The summary of the cost estimate is presented in the table below.



Table ES-1: Break down of cost

S.N. Description of Item Amount (NPr) A Land & Support 210000000 B Pre-Operating Expenses & Management Cost 720000000 C Infrastructure Works 93358372 D Civil Cost 2683475976 D1 General Items 272800000 D2 Main Civil Works 2410675976 100 Head Pond at Tailrace of UT3A 141313974 200 Adit Tunnel-1 71682595 300 Adit Tunnel-2 46459701 400 Adit Tunnel-3 34857066 500 Headrace Pressure Pipe 133113564 900 Headrace Tunnel (Upto Surge Tank) 1208813207 1000 Underground Surge Tank 113601089 1100 Valve Chamber & Access Tunnel 22491036 1700 Pressure Tunnel & Vertical Shaft 146823749 2600 Powerhouse 330993711 2700 Tailrace Conduit 97389898 2800 Tailrace Pond 43460900 3000 Switchyard (Civil Works) 19675487

E Hydro Mechanical Cost 451363073.8 3200 Gates/Stoplogs/Valve 142728782 3300 Steel Lining in Pressure Shaft 164568650 3400 Headrace Pressure Pipe 142982920 3500 Trash Rack 301498 3600 Air Suction Pipe (Surge Tank to Valve Chamber) 781224

F Electro-Mechanical Cost 1306505000 3700 Turbine Equipment 388858750 3800 Generator 521360000 3900 Auxiliaries - Hydraulic Equipment 27431250 4000 Auxiliaries - Electrical Equipment 359955000 4100 Gantry Crane 8900000

G

132kV Single Circuit Transmission Line and bay extension and metering arrangement in Trishuli 3B Hub 28500000

Total (A+B+C+D+E+F+G) 5493202422



VAT @ 1% (E/M, H/M &Transmission Line) & @13% in others 499752146

Base Cost as of 2013 5992954568 Physical Contingencies 460001839

5.0 % of E/M &H/M Works and Transmission Line 89318404

10.0 % of Main Civil Works & Others 370683435 Total Cost as of 2013 6452956407 Taxes & Duties (1.5%) 96794346 Total Cost with Taxes & Duties 6549750753 Price Contingencies (7.5%) 491231306.5 Total escalated cost at the end of the construction 7040982060 Interest during construction (10%) 704098206

Total financial cost of the project at the end of Construction NRs. 7745080266

Exchange Rate 1 US$ is equivalent to NRs. 95.00 95

Total financial cost of the project at the end of construction in US$.: 81527161

Specific Cost of the project (US $ / kW): 1941 B/C Ratio 1.55 FIRR 17.23

ES-12 Project Economics

Economical analysis of the project is carried out to assess the economical viability of the project.

Cash flow series has been developed for the project economic life 50 years and the cash streams

have been discounted to the first year of construction. Required economic indicators were then

determined. The results of economic analysis cash flow are summarized below:

Table ES-2: Result of Economic Analysis

Net Present Value of the project NPr 3551 Million at 10 % discount

Internal Rate of Return 15.36

B/C ratio 1.55

Specific Energy Cost 2.81 NPr/kWh



ES-13 Financial Evaluation

A financial analysis was carried out as cash flow of revenue and expenditure. It has been assumed

that debt equity ratio will be 70:30 with an interest rate of 10 % on debt. It was also assumed that

the loan will have a grace period during construction and will be paid in twelve years from the start

of commercial operation. Royalties and taxes, if applicable, have been deducted from the revenue to

derive net cash flow. Escalation factors based on price index has also been considered. The

assumptions and results of the financial analysis are shown in Table ES-3.

The analysis showed that the project gives return on equity is 17.23 % for a loan interest rate of 10

%, selling price of energy NPr 4.5 and repayment period of 8 years for a debt-equity ratio of 70:30.

So the project can be termed financially viable.

Table ES-3: Financial Analysis Data and Result

Basic Data

Base Year 2015 Project Economic Cost 704.10 Crores NRs O&M Cost 1.50% Construction Period 4 Years Start Year of Construction 2015

Financial Factors Insurance Charges 1.0% of Total Financial Cost Cost Price Escalation 3% per year

Financial Costs Total Project Cost with Inflation 715.94 Crores NRs Interest During Construction 112.77 Crores NRs Total Project Cost with IDC 828.72 Crores NRs

Loan Debt : Equity 70 : 30 Loan Amount 493.75 Crores NRs Interest During Construction 10.00% Repayment Period 8 years

Energy Production Installed Capacity 42.00 MW Firm or Dry Season 94.54 GWh Secondary or Wet Season 243.34 GWh

Energy Prices Energy Benefit

Firm or Dry Season 4.5000 NRs/kWh Secondary or Wet Season 4.5000 NRs/kWh Base Year for Energy Pricing 2019



Escalation of Energy Prices 3% Number of years for above escalation 9 Energy Price after 9 years Dry Season Energy Price 5.7150 NRs/kWh Wet Season Energy Price 5.7150 NRs/kWh

Results

Financial Rate of Return 17.23%

ES-14 Conclusion and Recommendation

The 42 MW Upper Trishuli -3A Hydroelectric Project is a medium sized run of river cascade project

which is tailrace scheme of Upper Trisuli 3A Hydroelectric Project and has high amount of dry

season flow and h i g h e r river gradient. It has good project geology and has good infrastructure

for construction. This scheme which is close to the major load center is attractive from technical,

economic and environmental point of view. Major structures of this scheme comprise of a

headpond, 4.288 km long headrace tunnel, semi surface powerhouse and ancillary facilities. This

scheme is envisaged to generate nearly 337.88 GWh of average energy per year out of which

76.8 % is 90 % firm energy. The minimum power available during dry season is 29.19 MW which

is suitable from system point of view. Estimated project cost is 6452.95 Million NPr which

includes 10% contingency surface and underground civil works and 5% contingency for electro-

mechanical equipment. The project economic evaluation indicates that B/C of the project is 1.55,

EIRR is 15.36 % and cost/KWh is 2.81 cents. Financially, return on equity is 17.23 % for a loan

interest rate of 10% and repayment period of 8 years for a debt-equity ratio of 70:30.

It is hence recommended that the project should be given high priority for implementation at the

earliest in-order to alleviate the present power shortage. The EPC contract document of the project

need to be finalized and preparatory works like project road, camp, adit tunnel need to be taken up

at the earliest. As this scheme can increase the present generation capacity of the system at an

affordable cost, this project needs to be expedited on a priority basis.

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