world bank document€¦ · (world bank partial credit guarantee) public disclosure authorized ......

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E-235 VOL. 22

TNB Stage II Inter Connection and

Transmission System Expansion Project No. 9

J2 VII Viil H Uiiiii~i-UI l&ll i Xi -it-lJtirn

Construction and

Maintenance of Transmission Lines

EGAT - INVESTMENT PROGRAM SUPPORT PROJECT

(WORLD BANK PARTIAL CREDIT GUARANTEE)

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Environmentai Guiueiines for irianni-ug,

Construction and


Contents

TRANSMISSION SYSTEM EXPANSION PROJECT NO. 9 andEGAT-TNB STAGE II INTER CONNECTION

ENVIRONMENTAL GUIDELINES FOR PLANNING, CONSTRUCTION ANDMAINTENANCE OF TRANSMISSION LINES

pageExecutive Summary i

1 Introduction 1

2 Project Description 3

3 Legal and Administrative 72

4 Route Selection Criteria and Mitigation Strategies 78

5 Environmental Issues 90

6 Mitigation Measures 92

8. Monitoring 93

Executive Summary

TNB Stage 11 Inter Connection and


Environmental Guidelines for Planning, Construction and


Introduction

1. The Electricity Generating Authority of Thailand (EGAT) is a state enterprise

under direct supervision of the Office of the Prime Minister. EGAT was established

on May V 11969 to nationalize nd consolidate thA>e fuLnctions and responsibili-es of

three independent state enterprises: the Yanhee Electricity Authority (YEA), the

Lignite Authority (LA) and the North-East Electricity Authority (NEEA). EGAT is

now in the process of privatization. EGAT has the responsibility to provide electricity

for the entire Kingdom of Thailand by generating, transmitting and selling bulk

energy to two distributing entities, namely the Metropolitan Electricity Authority

(MEA) and the Provincial Electricity Authority (PEA).

2. The current EGAT long term Power Development Plan (PDP 95-01) includes

about 13,100 MW total power purchase from IPPs up to the year 2011, representing

30% of the total installed capacity at that time. To facilitate private sector investment

in IPP projects, EGAT will construct Transmission System Expansion Project No. 9

and TNB Stage II Inter Connection.

Project Description

3. Transmission System Expansion Project No. 9 is also prepared in response to

the Government's policy to continue the development of infrastructure to sustain the

economic growth of the country . TS 9 is a package of 26 subprojects of transmission

lines and substations expansion and reinforcement. The project involves the

construction and reinforcement of transmission lines totalling 1,890.0 circuit-kilomreters,

and 10 substations. The total amount of 5,900 MVA transformer capacity and 1,202.4

MVA reactive power compensation equipment installed at the existing substations are

also included.

4. TNB stageIl Interconnection consisits of two parts: the construction of HVDC

transmission, and internal system reinforcement.

Legal and Administrative

5. Environmental Impact Assessment (EIA) is not required under current

Thailand law and regulation for the Transmission System Expansion Project No. 9

and TNB Stagell Inter Connection. The EIA for the transmission system will be

expected only when all or a portion of the transmission line routes are located in

Watershed classification class 1 B (or wildlife sanctuary area, or national park area,

or mangrove area). The project routes do not traverse any of these. This report is a

focused environmental analysis of environmental impacts of project components and

their mitigation measures as required by the World Bank.

Analysis of Alternatives

6. Power system studies were reviewd based on the latest EGAT and TNB Power

Dhevelopment Planis (PDP) to firm up the 300 MW EGAT - TNB Stage II

Interconnection .The studies have been carried out for three options: (1) Without

EGAT - TNB Stage II Interconnection, (2) With EGAT - TNB HVAC Interconnection

and (3) With EGAT -TNB Stage II Interconnection. The EGAT PDP, revised PDP

ii

92-01 , and 1991 load forecast together with the updated version of TNB' s PDP and

load were adopted for the study .

Route Selection Criteria and Mitigation Strateeies

7. In selection of routes for transmission lines and substation sites, EGAT

uses design criteria to minimize environmental impacts on forest, wildlife, watershed

areas, populations, archaeological sites and scenery. Transmission line right of

ways are not to be located through: (a) restricted Class IA watershed area, according

to laws and regulations; and, (b) holy places, archeological sites and government

sites. Transmission line right of ways should also avoid: (a) watershed area class lB,

Addiional forest conservation areas (Class C),mangrove forest, national parks and

other conservation areas; (b) community and developed areas; (c) parallel with,

or close to telephone and telegraph cables for a long distance to avoid

8. Detailed Route Surveys: Before construction of the transmission system,

detailed route surveys will be performed by EGAT staff together with the Royal

Forest Department (RFD). The number of forest trees to be cut will be documented.

In addition, final route selection adjustments to avoid dwellings and circumvent other

areas of potential negative impact will be made, according to EGAT's environmental

design criteria.

9. Construction: EGAT's guidelines for construction activities are: (a) avoid

installation of new access roads for construction purposes; try to utilize existing

trails; (b) no cutting of trees over the limitations set by RFD; and, (c) clean up

construction sites upon completion of construction work.

10. Maintenance of the Right of Way: Along the valleys, only trees considered to

be hazardous to the stability of the transmission system would be cut down.

Landowners are permitted to cultivate economic crops under EGAT's criteria

along the right of way corridors. Upon completion of transmission line construction

iii

work, ground cover around the towers will be planted and land contouring will be

done as required to provide a protective covering for the earth and to prevent

soil erosion. No herbicides are used in right of way maintenance .

Environmental Issues:

11. Environmental Impact on Water Resources: Potential impacts of a

transmission system on water quality are related to construction activities: surface

run-off from construction sites; wastewater from the temporary office and

construction camps; and, wastewater contaminated with oil or grease from machinery

which will be mitigated . The construction sites, temporary office and construction

camp will locate more than 100 meters far from water resource or stream and all of

slope area is less than 45 degree. The construction will follow the EGAT'S

Environmental Guidelines for Transmission System.

12. Forest resources: There are 25 sub projects, with a length of approximately

159.55 kilometers, that pass through the reserve forest (non protected forest). There

are no watershed area class IA and 1B, wildlife sanctuary, national park ,mangrove

forest area or addition forest conservation area (C) near any transmission line of

subproject on Transmission System Expansion Project No. 9. TNB Stage II Inter

Connection Project comprises 3 tranmission lines ,a distance of approximately 213.5

kilometers, that pass through the reserve forest. Many of these 'forest areas' have

already been cleared for agriculture are other purposes . The attached route maps show

the actual conditions found in walk-throughs . There is no watershed area class 1A

and IB, wildlife sanctuary, national park ,mangrove forest area or addition forest

conservation area (C) near any transmission line of subprojects .

13. Wildlife: There are 159.55 kilometers of Transmission System Expansion

Project No. 9 and 213.5 kilometers of TNB Stage ii inter Connection Project fhat pass

through the reserve forest that are not significant for conservation. Many of the

reserve forest areas where the transmission lines traverse have already been cleared

iv

for agriculture and other purposes (see maps). The wildlife are mostly small in size

and they can adjust well to minor change in the environment.

14. Land Use: The project construction phase will cause the loss and limitation of

agricultural land use in the ROW; however, the impact is on a small total land area

because most of the crops have a short growing season and they do not exceed the

height restrictions for vegetation in the right of way. Transmission System Expansion

Project No. 9 and TNB Stage II Inter Connection Project have tranmission lines which

pass through the agricultural land totalling about 1,121.45 and 360.3 km . The

Maintenance of the right of way will follow the EGAT policy on post-project land

use.

15. Cultural and Esthetic Resources: There were no cultural or esthetic resources

that would potentially be impacted along the Transmission System Expansion ProjectMNr 0 nirA 'T'NTf St-g YT T,,+_. T 'fl--2

No nd B Sa II +.eCucion I roJect.

16. PCB Management: Transmission System Expansion Project No. 9 and TNB

Stage II Inter Connection Project will not involve replacement of equipment

potentially contaminated with PCB. EGAT has surveyed all potentially contaminated

electrical equipment.

17. Electromagnetic Frequency (EMF): A full discussion of EMF effects and

EGAT transmission lines is included in the Environmental Impact Analyses of the

Greater Bangkok Area, and the Environmental Report for 500 KV Transmission Line

for IPP's.

Mitigation Measures:

18. Natural Resources: Foundation towers and construction activities including

transportation of construction materials, material storage and worker housing would

be located at least 50 meters away from surface water resources to avoid soil erosion.

In case it is necessary to use areas closer to water resources, soil barriers would be

v

built to block erosion and sedimentation. Vegetative cover would be replaced along

streambanks and the surrounding project site if disturbed, to prevent soil erosion. In

all areas, sanitary latrines will be constructed for workforce and temporary offices,

and good housekeeping measures will minimize potential water contamination clue to

construction.

19. Forest Resources: The following mitigation measures would be followed: (i)

deforestation to be done only in the right of way ii) reforestation is the responsibility

of EGAT, the area of reforestation would be more than the area of national forest

reserve used for the ROW; iii) in case private land is used in construction, it is the

responsibility of EGAT to contact the owner and pay fair compensation. Many of the

'forest areas' along the routes have already been cleared for agriculture and other

purposes (see map section).

20. Wildlife: The impacts can be controlled by: i) deforestation only in the

right of way area; ii) prohibition on disturbing wildlife, including nests, eggs, holes,

hollows and other habitat; iii) prevention of noise pollution by limiting work hours

between 8.00 am and 16.00 pm., all work to be forbidden at night.

21. Land Use: EGAT would plan all the project activities including material

transportation, pole mounting and others in the dry season, because most of the crops

would already have been harvested. Removal of agricultural plants (particularly

perennials) would be done only as necessary and compensation paid. Farmers would

be allowed to grow short-lived crops with heights in the ROW under EGAT's Criteria

after construction.

Monitoring

22. The following monitoiirig plan will be adopted to track the effectiveness of

mitigation techniques, and to address recognized problems in an appropriate and

timely manner. This regular scheduled monitoring program will consist chiefly of

visual inspections during construction and operation for:

vi

o erosion along access roads, substation and transmission tower foundations;

o encroachment of settlements within rights of ways, encroachment of

settlements within protected areas via transmission line access roads,

exploitation of forest resources in protected areas via access roads;

o vegetation clearances below transmission lines, and invasion of exotic species

along right of ways;

o transformer fluid leakage and spills.

vii



Environmental Guidelines for Planning, Construction and


1. Introduction

The Electricity Generating Authority of Thailand (EGAT) is a state enterprise under direct

supervision of the Office of the Prime Minister. EGAT was established on May 1, 1969 to

nationalize and consolidate the functions and responsibilities of three independent state

enterprises: the Yanhee Electricity Authority (YEA), the Lignite Authority (LA) and the

North-East Electricity Authority (NEEA). EGAT is now in the process of privatization.

EGAT has the responsibility to provide electricity for the entire Kingdom of Thailand by

generating, transmitting and selling bulk energy to two distributing entities, namely the

Metropolitan Electricity Authority (MEA) and the Provincial Electricity Authority (PEA).

It is certainly realized that the electric power, a source of energy, is an infrastructure in

strengthening the economic and social development of a country. To provide the adequate and

reliable supply of electricity is the predominant responsibility of EGAT. Following the

recovery from economic recession period in 1987, the electricity consumption in Thailand has

been increasing at the extremely high rate. The growth rates of peak generation requirement

were recorded at two digits, and expected to further increase at high levels (10.09 % for the 7th

NESDP and 7.90 % for the 8th NESDP). In line with the electricity requirement of the country,

EGAT's Power Development Plan (PDP) has been prepared and periodically revised. The PDP

always includes the investments for expansions of transmission system as well as the power

generation facilities, since the electricity once generated must be transmitted and distributed to

consumers. The transmission system expansion program involves the constructions of

1

transmission lines and substations for reinforcement of the electric power system to keep abreast

of the load growth and to expand the electricity services to remote areas.

Several Transmission System Expansion Projects (TS Projects) have been included in the PDPs

and implemented in successive stages. So far, eight transmission system expansion projects,

namely Transmission System Expansion Projects No.1 to Transmission System Expansion

Projects No.8 have been formulated. In addition to the normal transmission system expansion

projects, several accelerated transmission projects have also been formulated to increase the

power transfer capability of the interconnection between regions and to supply power for large

industrial loads and the unexpected fast increase in power demand.

Transmission System Expansion Projects No.9 (TS.9 project) has been listed as one of the

transmission system expansion projects in the Seventh National Economic and Social

Development Plan (the 7th NESDP). In the 7th NESDP, the Government has set the policy

guidelines to improve the power system reliability. One of the policy guidelines is to improve

transmission and distribution systems for more sufficient, reliable, high quality, and safety of

supply, especially for industrial and new economic development areas; and to reinforce the

power system interconnection with neighbouring countries to provide more energy interchange

capability for the economic and system reliability. The TS.9 Project is planned for

implementation during 1996-1998.

TNB Stage II Inter Connection is the power system interconnection between EGAT and TNB

(Tenaga Nasional Berhad) of Malaysia was first energized on February 1, 1981. The

interconnection consists of a 24.5 km single circuit 132 KV 240 mm2 ACSR transmission line

linking Sadao substation of EGAT and chuping Substation of TNB; and two 115/132 KV

transformers, rated 66.7 MVA each.

The existing EGAT-TNB interconnection are initially proposed for regular peak power

exchange, but operation of the systems indicated oscillatory damping and power swing

problems as the size of the interconnection is too small in relation to the size of the two systems.

The present power system is operated in such a way that parts of southern portion of EGAT

system or parts of northern region system of TNB will have to be disconnected with the rest of

its main grid and synchronized with the other system whenever the power exchange is required.

As the two systems cannot be fully synchronized, thus restricts its utilization, EGAT and TNB

therefore agreed to individually conduct the preliminary studies to strengthen the

interconnection and the possibility of upgrading the interconnection to gain the full benefits of

the interconnection. Since 1986, several meeting between EGAT's and TNB's system planning

staff have been held both in Thailand and Malaysia to review results of the preliminary studies

and pursued the joint study on the Stage II EGAT-TNB Interconnection Project aiming at the

maximum power exchange of 300 MW.

2. Project description

The land use classification are shown in the maps attacked to the project description. There are

two basic land use in the transmission line project areas: agricultural land and reserve forest.

The reserve forest areas have been broken down into areas for which land use permits have been

obtained, and areas for which land use permits are pending. As can be seen in the map, the

majority of the routes traverse agricultural area. These area are typically para rubber or rice. The

reserve forest areas are usually degraded forest (or converted to rubber plantation), as oppossed

to protected forest. There are no protected forest area involved in the project no. 9 or TNB.

The reserved forest areas through which the TNB project passes are almost exclusively

converted to rubber plantation. Only 10 % of the TNB project passes through reserve forest

areas.

. ~3

2.1 TNB Stage II Inter Connection

The EGAT-TNB stage II Interconnection consisits of two parts: the construction of HVDC

transmission, and the internal system reinforcement.

1. The HVDC transmission comprises:

(a) Due to the limited area of Hat Yai 2 substation , a new site is proposed at

Khlong Ngae for the installation of HVDC converter . The HVDC converter will be 250 KV

300 MW monopolar and upgradable at a later stage to bipolar for 600 MW.

(b) Construction of a 250 KV HVDC bipolar line from Khlong Ngae converter

station to the Thailand-Malaysia border, using 2x400 mm2 conductors per pole (pole 2

conductor will be used as metallic return for the initial stage monopolar), a distance of

approximately 24 km.

(c) Installation of communication system.

2. The internal network reinforcement comprises:

(a) Construction of HVAC 230 KV Switchyard at Khlong Ngae to link the HVDC

converter station via two converter transformers with the 230 KV HVAC four lines, two lines

from Hat Yai 2 substation and two lines from Thung Song Substation.

(b) Construction of a double circuit 230 KV Hat Yai 2-Khlong Ngae linw, using 2

x1272 MCM ACSR conductor per phase, a distance of approximately 30 KM.

(c) Construction of a double circuit 230 KV Thung Song-Khlong Ngae lin, using 2

x1272 MCM ACSR conductor per phase, a distance of approximately 210 KM.

(d) Expansion of 230 KV Hat Yai 2 Substation for two outgoing lines to Khlong

Nage converter station.

(e) Expansion of 230 KV Thung Song Substation for two outgoing lines to Khlong

Ngae converter station

(f) Addition of communication system.

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TNB Stage II Inter Connection

Name of Transmission Lines Lenght Reserved Forest Passed Agriculture Land

1. 230 KV Klong Ngae-Thung Song 210 20.2 189.8

2. 230 KV Had Yai 2- Klong Ngae 24 24

3. 300 KV Klong Ngae - Borded (Thai-Malasia) 24 24

4. 230 KV Krabi-Thung Song 78.8 38.8 40

5. 500 KV Border (Namn Province) -Mae Moh 3 237 154.5 82.5

. - 6

2.2 Transmission System Expansion Project No.9

TS.9 project is also prepared in response to the Government's policy to continue the

development of infrastructure to sustain the economic growth of the country. The objectives of

the TS.9 project are therefore:

(i) to provide sufficient power for future demand;

(ii) to improve reliability of power supply particular in new industrial and

commercial areas;

(iii) to support the distribution system expansion to various remote areas.

The TS.9 project is a package of 25 subprojects of transmission lines and substations expansion

and reinforcement. The project involves the construction and reinforcement of transmission

lines totalling 1,890.0 circuit-kilometers, and 10 substations. The total amount of 5,900 MVA

transformer capacity and 1,202.4 MVA reactive power compensation equipment installed at the

. ~7

TRANMISSION SYSTEM EXPANSION PROJECT NO. 9

No. Name of Transmission Lines Lenght Reserved Forest Passed Private Land Passed Remarks

Km. Km. Km.

1. 230/115 KV BAN PONG 2 - BAN PONG I - NAKHON CHAISRI 43 43 old ROW

- SAM PHRAN 2 LINES

2. 115 KV BOR WIN - BAN BUNG LINE 27 27

3. 115 KV THATAGO - THA WUNG LINE 2 2

4. 115 KV THA]LAN 3 - SARABURI I LINE 15 15 old ROW

5. 115 KV THALAN 1 - THALAN 3 LINE 5 5

6. 115 KV RATCHABURI 2 - PHETCHABURI LINE 54 54

7. 115 KV PRACHIN BURI 2 - WATTHANA NAKHON LINE 67 41.2 25.8

8. 115 KV MUKDAHAN - THAT PHANOM LINE 36 25.95 10.05

9. 115 KV THAT PHANOM - NAKHON PHANOM LINES 59 59

10. 115 KV UDON THANI 2 - NONG BUA LAM PHU LINE 61 3.7 57.3

11. 115 KV ROI ET - PHAYAKKHAPHUM PHISAI LINE 84 84

12. 115 KV PHAYAKKHAPHUM PHISAI - SURIN LINE 80 20.15 59.85

13. 115 KV CHAIYAPHUM - BAMNET NARONG LINE 58 58

14. 115 KV UBON RATCHATHANI 2 -KANTHARALAK LINE 55 55

15. 115 KV SURIN - SANGKHA LINE 49 10.1 38.9

16. 230 KV THUNG SONG - NAKHON SI THAMMARAT LINE 54 54 old ROW

17. 230 KV SURAT THANI - THUNG SONG LINE 122 122 old ROW

18. 230 KV KHLONG NGAE - YALA LINE 120 1.5 118.5 old ROW

19. 2301115 KV PHlANGNGA - PHUKET JUNCTION - PHUKET 2 LINE 88 88 old ROW

20. 115 KV YALA -NARATHIWAT LINE 61 61

21. 115 KV SURAT THANI - BAN DON LINE 14 14

22. 115 KV LAN KRABU - KAMPHAENGPHET LINE 47 34.85 12.15

23. 115 KV MAE MOH 3 - LAMPANG 2 LINE 27 15.1 11.9

24. 115 KV CHIANG MAI 2 - MAE TAENG LINE AND SUBSTATIONS 42 7 35

25. 230 KV RATCHABURI 2 - PRACHAUB KHIRIKHUN LINE II I old ROW

SUBPROJECT NO.1

230/115 KV BAN PONG 2- BAN PONG 1- NAKHON CHAISRI

-SAM PHRAN 2 LINE

A. Objective

Objective of Subproject No.1, the 230/115 kV Ban Pong 2 - Ban Pong 1 - Nakhon Chaisi -

Sam Phran 2 lines and substations, is to provide sufficient and reliable power supply for the

increasing demand of industrial plants in the western area.

B. Proiect Scope and Description

Project Scove

The scope for the 230/115 kV Ban Pong 2 - Ban Pong 1 - Nakhon Chaisi -Sam Phran 2

lines and substations consists of the following constructions:

a) Construction of 115 kV temporary detour lines on the existing rights-of-way from

Ban Pong 1 to Nakhon Chaisi and from Nakhon Chaisi to Sam Phran 2, using 1272 MCM

ACSR conductor, and dismantling the existing 115 kV Ban Pong 2 - Ban Pong 1 Line No.2

(200 sq.mm TACSR/AW conductor) and the existing 115 kV Ban Pong 1 - Nakhon Chaisi -

Sam Phran 2 single circuit line.

b) Construction of 230 kV double circuit Ban Pong 2 - Ban Pong 1 - Nakhon Chaisi -

Sam Phran 2 transmission line, double circuit steel towers, using 2x1272 MCM ACSR

conductor per phase, a distance of approximately 43 km. The new 230 kV line designed

with differential insulation, will be constructed on the existing right-of-way of the

dismantled 115 kV single circuit Ban Pong 2 - Ban Pong 1 - Nakhon Chaisi - Sam Phran 2

line. The new 230 kV lines will be initially energized at 115 kV and one circuit will be

temporary terminated at 115 kV Ban Pong 1 Substation and both circuit will be terminated

at 115 kV Nakhon Chaisi Substation.

9

c) Expansion of 115 kV Ban Pong 2 Substation for one additional line.

d) Expansion of 115 kV Nakhon Chaisi Substation for two additional lines.

e) Expansion of 115 kV Sam Phran 2 Substation for one additional line.

f) Land procurement for the extension of Nakhon Chaisi Substation for future 230 kV

switchyard. However, if the adjoining piece of land would not be available, the new site of

230 kV switchyard, called Nakhon Chaisi 2, would be considered, and the four-circuit

transmission line for double circuit 230 kV line and double circuit 115 kV line on the same

tower would be constructed to link the new 230 kV Nakhon Chaisi 2 Substation to the

existing 115 kV substation.

g) Addition of communication system.

Project Description

At present, the transmission system which supply power demand in the western area

consists of a 115 kV loop among three major 230 kV substations, via 230/115 kV tie

transformers at Sam Phran 1, Ban Pong 2 and Ratchaburi 2 Substations. The demand in this

area has been increasing rapidly due to the industrial development. Part of 115 kV line

sections have been reinforced under ATP and TS.8 projects to maintain the power supply

reliability. The reconstruction of 115 kV Sam Phran 1 - Sam Phran 2 line from single

circuit to double circuit, using 2x795 MCM ACSR conductor per phase, is being

implemented under TS.8 project and expected to be commissioned by the end of 1995.

The combined peak power demand at Ban Pong 1, Nakhon Chaisi, and Sam Phran 2

Substation was 283.5 MW in 1993 which caused heavy line loading on 115 kVlines from

Ban Pong 2 to Sam Phran 1 Substations and it is anticipated that the line loading will reach

the transmission line capacity limit in near future. Since, most of the power demand in this

area is industrial load, therefore, high reliability of power supply is very important. The

transmission system reinforcement to cope with the increasing demand is therefore required.

Due to the difficulty to obtain a new right-of-way in these areas, the construction of a 230

kV double circuit Ban Pong 2 - Ban Pong 1 - Nakhon Chaisi - Sam Phran 2 line on the

existing rights-of-way and initially energized at 115 kV is proposed in view of long-term

planning consideration. The differential insulation should also be considered in the design

of the double circuit structure to reduce the probability of simultaneously trip of both

circuits due to lightning stroke.

Figure of the proposed line route of the Subproject is shown in appendix

C. Project Implementation

The proposed commissioning date is December 1997.

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SUBPROJECT NO. 1. 230/115KV BAN PONG 2~~~-BNPNG-NAONCASI-AMPRN2IE

SUBPROJECT NO.2

115 KV BOR WIN - BAN BUNG LINE

A. Objective

Objectives of Subproject No.2, 115 kV Bo Win - Ban Bung line and substations, are to

provide sufficient power supply for future demand and industrial loads and to improve

reliability of power supply in the Ban Bung area.

B. Project Scope and Description

Proiect Scope

The scope for the 115 kV Bo Win - Ban Bung line and substations consists of the following

constructions:

a) Construction of 115 kV double circuit Bo Win - Ban Bung line, double circuit steel

towers, using 2x795 MCM ACSR conductor, a distance of approximately 27 km.

b) Expansion of 115 kV Bo Win Substation for two outgoing lines.

c) Expansion of 115 kV Ban Bung Substation for two incoming lines.

d) Addition of communication system.

Project Description

The existing 115 kV Ban Bung Substation is connected with the 115 kV Si Racha

Substation via a 115 kV single circuit line, 33.2 km, using 477 MCM ACSR conductor.

The present peak demand at Ban Bung Substation is 49.6 MW and is expected to increase at

high growth rate due to the industrial developments in this area. Ban Bung is located in the

13

area which is classified by The Board of Investment (BOI) as the Investment Promotion

Zone 2 which has more privilege than Zone 1 where the Government has recently issued the

policy to limit the industrial developments in Zone 1, and also the policy to move out some

existing industries from the area of Zone 1. The area around Ban Bung is considered one of

the suitable locations to accommodate the industries and industrial estates. The new

transmission lines is therefore required to improve the reliability of power supply. The

construction of a 1 15 kV double circuit Bo Win - Ban Bung line is proposed.



The proposed commissioning date is September 1997.

1 4

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SUBPROJECT NO. 2. 115 KV BOR WIN - BAN BUNG LINE

SITBPROJECT NO.3

115 KV THA WUNG SUBSTATION AND LINE

(115 KV THATAGO - THA WUNG LINE)

A. Objective

Objectives of Subproject No.3, 115 kV Tha Wung substation and lines termination, are to

increase power supply capability to meet the increasing demand at Sing Buri and Lop Buri 1

Substations, to improve system reliability, and also to reduce transmission system losses.


Project Scope

The scope for the 115 kV Tha Wung Substation and lines termination consists of the

following constructions:

a) Construction of new 115 kV Tha Wung Substation together with the termination of

1 1 5 kV double circuit Ang Thong 2 - Lop Buri 2 line and 115 kV single circuit Sing Buri -

Lop Buri 1 line at Tha Wung Substation. The power supply for station service will be

received from PEA distribution line or a small transformer relocated from the existing

system.

b) Land Procurement for the 115 kV Tha Wung Substation with provision for future

230 kV switchyard.

c) Addition of communication system.

16

Project Description

At present, the existing 1 15 kV Sing Buri Substation is connected with the 115 kV system

via a single circuit line with conductor size of 477 MCM ACSR, a distance of 28 km from

Takhli 2 Substation; and a single circuit line with small conductor size of 4/0 ACSR, a

distance of 33 km from 115 kV Ang Thong 1 Substation. The 115 kV line is also extended

from Sing Buri Substation with a single circuit using small conductor size of 4/0 AWG

ACSR to supply power radially to Lop Buri 1 Substation.

The existing 115 kV lines will not be sufficient to provide reliable power supply to the total

power demand at Sing Buri 1 and Lop Buri 1 in 1997. To cope with the increasing demand,

the system reinforcement in this area is necessary. According to the present transmission

network configuration, there is a line crossing between the double circuit 115 kV Ang

Thong 2 -Lop Buri 2 line and the 115 kV Sing Buri - Lop Buri 1 line at Tha Wung district,

therefore the construction of a new substation at Tha Wung with the termination of 115 kV

Ang Thong 2 - Lop Buri 2 line and 115 kV Sing Buri -Lop Buri 1 line at Tha Wung

Substation is proposed. This substation will improve the system reliability of power supply

at Sing Buri and Lop Buri 1 Substations.




7 7

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SUBPROJECT NO. 3, 115 KV THATAGO - TIJA WUNG LINE

SUIBPROJECT NO.4 5

115 KV TIHA LAN - SARA BURI LINE

A. Objective

Objective of Subproject No.4, 5, 115 kV Thalan - Saraburi line and substations, is to

improve reliability of power supply for Saraburi Province.

B. Proiect Scope and Description

Project Scope

The scope for the 115 kV Thalan 3 - Saraburi 1 line and substations consists of the


a) Construction of 115 kV temporary detour single circuit line from Thalan Junction

(near Thalan 3 Substation) on the existing right-of-way to Saraburi 1 Substation, using 477

MCM ACSR conductor stringing on concrete pole for a distance of approximately 13 km.

b) Dismantling the existing 115 kV line section from Saraburi 1 Substation to Thalan

Junction and reconnecting this temporary detour line with the remaining 115 kV line section

from Thalan Junction to Thalan 1 Substation.

c) Construction of 115 kV double circuit Thalan 3 - Saraburi 1 line, double circuit steel

towers, using 795 MCM ACSR conductor for a distance of approximately 15 km. The new

transmission line section from Thalan Junction to Saraburi 1 will be constructed on the

existing right-of-way. The Thalan Junction to Thalan 3 will require a new right-of-way.

d) Construction of 115 kV Thalan 3 - Thalan Junction - Thalan 1 line, single circuit on

double circuit steel towers, using 795 MCM ACSR conductor, for a distance of 5 km. The

new line section between Thalan Junction and Thalan 1 Substation will be constructed on

the right-of-way of the existing 115 kV line to Thalan 1 which will be dismantled. This line

section will form a new 1 15 kV Thalan 1 - Thalan 3 line.

. <- 49

e) Expansion of 115 kV Thalan 3 Substation for three outgoing lines.

f) Expansion of 1 1 5 kV Saraburi i Substation for one additional incoming line.


Project Description

The power demand in Saraburi Province is mainly supplied from Saraburi 1 Substation

which is connected with Thalan 1 Substation via a 115 kV single circuit line. The present

peak demand is 44.4 MW and expected to increase at 10 % annually. Since there is only

one circuit that supplies power to Saraburi 1 Substation, additional transmission circuit is

required to improve reliability of supply. The construction of a new 115 kV double circuit

Thalan 3 - Saraburi 1 is therefore proposed.

To avoid the problems on right-of-way acquisition, the right-of-way of the existing 115 kV

line from Thalan 3 Junction, about 2 km south of Thalan 3 Substation (See Figure 4.4), to

Saraburi 1 substation will be used for the construction of the new transmission line. To

maintain power supply to Saraburi 1 Substation during the deenergization of the existing

line, construction of a temporary 115 kV detour line from Thalan 3 Junction to Saraburi 1

Substation is required.

To utilize the existing ritght-of-way of 115 kV line section from Thalan 3 Junction to

Thalan 1, the construction of 115 kV Thalan 1 - Thalan Junction - Thalan 3 line, single

circuit on double circuit steel towers, using 795 MCM ACSR conductor, is also

recommended. This line will increase power transfer capability between Thalan 1 and

Thalan 3 Substation.

Figure of the proposed line route ofthe Subproject is shown in appendix


The proposed commissioning dates is July 1998.

20

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SUBPROJECT NO. 4. 11 5 KV TIIALAN 3 - SARABURI I LINE

SlJBPROJECT NO.6

115 KV RATCHABURI - PHETCHABURI LINE

A. Objective

Objectives of Subproject No.6, 115 kV Ratchaburi 2 - Phetchaburi line and substations, are

to maintain reliability of power supply at Phetchaburi Substation, and also to reduce system

losses.


Project Scone

l-he scope for the 115 kV Ratchaburi 2 - Phetchaburi line and substations consists of the


a) Construction of 115 kV double circuit Ratchaburi 2 - Phetchaburi transmission line,

using 2x795 MCM ACSR conductor/per phase, a distance of 53.1 km, on the right-of-way-

of the existing 115 kV single circuit line which will be dismantled.

b) Expansion of 115 kV Ratchaburi 2 Substation for one additional outgoing line.

c) Expansion of 115 kV Phetchaburi Substation for one additional incoming line.


C' ' )

Project Description

1Tne transmission network which supplies power in the areas of Ratchaburi 2, Phetchaburi,

Cha-Am and Hua Hin Substations is a loop tied between the two 230/115 kV Ratchaburi 2

and Hua Hin (under construction) terminal substations via a double circuit 230 kV line and

a single circuit 115 kV line from Hua Hin to Ratchaburi 2 via Cha-Am and Phetchaburi

Substations. Since the only one circuit of the 230 kV line from Ratchaburi 2 was planned to

be terminated at Hua Hin Substation; therefore, with the new projected increasing demand,

there will be overloaded problem in the 115 kV line when the 230 kV Ratchaburi 2 - Hua

Hin line tripping out. The reinforcement of the 115 kV line sections between Ratchaburi 2

and Hua Hin Substations is necessary, and the construction of a new double circuit 115 kV

Ratchaburi 2- Phetchaburi line is proposed.

Due to the difficulty of obtaining a new right-of-way in this area, the existing right-of-way

will be used for the construction of the new transmission line.



The proposed commissioning date is February 1998.

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SUBPROJECT NO. 6. 115 K~~~' RATCHABURI 2-- PHPETTHABURIRLINE

SUJBPROJECT NO.7

115 KV PRACHIN BURI 2 - WATTHANA NAKHON LINE

A. Objective

Objectives of Subproject No.7, 115 kV Prachin Buri 2- Watthana Nakhon line and

substations, are to provide sufficient and reliable power supply for future demand at

Watthana Nakhon Substation, and to reduce system losses.


Project Scope

The scope for the 115 kV Prachin Buri 2 - Watthana Nakhon line and substations consists of

the following constructions:

a) Construction of 115 kV Prachin Buri 2 - Watthana Nakhon line, single circuit on

double circuit steel towers, using 2x795 MCM ACSR conductor per phase, a distance of


b) Expansion of 115 kV Prachin Buri 2 Substation for one additional outgoing line to

Watthana Nakhon Substation.

c) Expansion of 115 kV Watthana Nakhon Substation for one additional incoming line

from Prachin Buri 2 Substation.


Project Description

Tne existing 115 k-V Watthana Nakhon Substation is radiaiiy connected with the 115 kV

Prachin Buri 1 Substation via a single circuit line. Under TS.8 Project, the termination of

115 kV Prachin Buri 1 - Watthana Nakhon line at the new 230/115 kV Prachin Buri 2

terminal substation will be completed in 1995. Voltage regulation at Watthana Nakhon

Substation will be improved by receiving power from Prachin Buri 2 Substation. However,

the improvement of reliability of power supply is still needed, since Prachin Buri and Sra

Kaew provinces is also considered the suitable sites for the industrial estates to

accommodate the new industries and the industries which would be moved out from BOI's

Investment Promotion Zone 1. The construction of a new 115 kV line, single circuit on

double circuit, is therefore proposed.


C. Proiect Implementation

The proposed commissioning date is July 1998.

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SUBPROJECT NO. 7. 115 KV PRACHIN BURI 2 - WATTHANA NAKHION LINE

SUBPROJECT NO.8 , 9

230/115 KV MUKDAHAN 2 SUBSTATION AND 115 KV MUKDAHAN 2

- THAT PHANOM - NAKHON PHANOM LINES

A. Objective

Objectives of Subproject No.8 , 9, 230/115 kV Mukdahan 2 Substation and 115 kV

Mukdahan 2 - That Phanom - Nakhon Phanom lines and substations are to improve

reliability and quality of power supply, to increase the power supply capability to Mukdahan

and Nakhon Phanom Provinces and to reduce system losses.


Project Scope

The scope for the 230/115 kV Mukdahan 2 Substation and 115 kV Mukdahan 2 - That

Phanom - Nakhon Phanom lines and substations consists of the following constructions:

a) Construction of new 230/115 kV Mukdahan 2 Substation to accommodate two 3-

phase 230/115-22 kV tie transformers, rated OA/FA/FOA 120/160/200 MVA, together

with 230 kV bays for the termination of one circuuit of 230 kV Savannakhet -Roi Et line

(constructed under Nam Theun 2 hydroelectric project in Lao PDR), including 115 kV bays

for connection to the existing 115 kV Mukdahan 1 Savannakhet and That Phanom

Substations.

b) Construction of 115 kV Mukdahan 2 - That Phanom line, double circuit steel towers,

using 795 MCM ACSR conductor, a distance of approximately 36 km.

c) Construction of 115 kV That Phanom - Nakhon Phanom line, single circuit on

double circuit steel towers, using 795 MCM ACSR conductor, a distance of approximately

59 km.

d) Upgrading the existing 69 kV That Phanom Substation from 69 kV to 115 kV

substation. Two 3-phase, 115-22-11 power transformers, each rated OA/FA/FOA, 15/20/25

ivIvA (using spare transformer from the system) will be instailed with three ii5 KV iine

bays provided for 115 kV lines from Mukdahan 2 and one 115 kV line to Nakhon Phanom

Substation.

e) Upgrading the existing Nakhon Phanom Substation from 69 kV to 115 kV

Substation. Two 3-phase, 115-22-11 power transformers, each rated OA/FA/FOA,

15/20/25 MVA (using spare transformers from the system) will be installed with one 115

kV bay provided for the line from That Phanom Substation.

f) Expansion of the 115 kV Mukdahan 1 Substation for one line from the Mukdahan 2

Substation.


h) Land Procurement for the 230 kV Mukdahan 2 Substation and for the expansion of

115 kV That Phanom Substation.

Proiect Description

At present, the power demand in Mukdahan Province is supplied from 115 kV Mukdahan

Substation which connected with Amnat Charoen Substation by a single circuit line. Due to

the long transmission line and the small conductor size, the unacceptable low voltage is

encountered at Mukdahan Substation. Therefore, the transmission system reinforcement is

required.

The present demand at Nakhon Phanom and That Phanom Substations was 19.38 and 10.52

MW respectively. Both are the end-substations; for which Nakhon Phanom Substation is

connected with the 115/69 kV Sakon Nakhon Substation by the 69 kV Sa-kon Nalchon -

Nakhon Phanom single circuit line with small conductor size of 95 sq.mm., for a distance of

89 km; and That Phanom Substation is connected with the 115/69 kV Sakon Nakhon

Substation by the 69 kV Sakon Nakhon - That Phanom line with small conductor size of 58

sq.mm., for a distance of 70 km.

Due to the increasing demand, the poor voltage regulation has been facing at both

substations, therefore to improve the voltage regulation and to increase the reliable power

supply capability to Mukdahan and Nakhon Phanom Provinces, the construction of a new

230/115 kV Mukdahan 2 Substation and construction of the 115 kV Mukdahan 2 - That

Phanom - Nakhon Phanom lines are proposed.



The proposed commissioning date is August 1998.

30

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SUBPROJECT NO. 8. 115 hV MUhDAHAN - THAT PHANOMI LINE

SUBPROJECT NO. 9. 115 KY- THAT PHANOMl - NAKHION PHANOMl LINES

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SUBPROJECT NO.10

115 KV UDON THANI 2 - NONG BUA LAM PH11U LINE

A. Objective

Objective of Subproject No.10, 115 kV Udon Thani 2 - Nong Bua Lam Phu line and

substations, is to improve reliability of power supply for Nong Bua Lam Phu and Loei

Provinces.


Project Scope

The scope for the 115 kV Udon Thani 2 - Nong Bua Lam Phu line and substations consists

of the following constructions:

a) Construction of 115 kV Udon Thani 2 - Nong Bua Lam Phu line, single circuit on

double circuit steel towers, using 795 MCM ACSR conductor, a distance of approximately

61 km.

b) Expansion of 115 kV Udon Thani 2 Substation for one outgoing line.

c) Expansion of 115 kV Nong Bua Lam Phu Substation for one incoming line.


Project Description

At present, the power demand in Nong Bua Lam Phu Province is supplied from Udon Thani

1, Udon Thani 2 and Loei substations via PEA 22 kV distribution lines. The Nong Bua

Lam Phu Substation is being constructed under TS.8 Project by terminating the existing 115

kV single circuit Udon Thani 1 - Loei line. The new 115 kV Nong Bua Lam Phu

Substation, which will be completed by the end of 1995, will increase the power supply

v .c)P..l'_

capability with better quality at an acceptable reliable services to the Nong Bua LTam Phu

Province and its vicinity. However, the power supply for Nong Bua Lam Phu and Loei

provinces is still supplied by a 115 kiV singie circuit line from Udon Thani 1 Substation.

Therefore, to cope with the future high peak demand, the improvement of reliability of

power supply is required to prevent the possibility of total blackout in these two provinces.

The construction of a new 115 kV Udon Thani 2 - Nong Bua Lam Phu line is proposed.



The proposed commissioning dates is August 1998.

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SUBPROJECT NO.11, 12

115 KV ROI ET - PHAYAKKHAPHUM PHI SAI - SURIN LINE

A. Objective

Objective of Subproject No.12, 115 kV Roi Et - Phayakkhaphum Phisai -Surin lines and

substations, is to improve reliability of power supply at Phayakkhaphum Phisai and Surin

Substations.


Project Scope

The scope for the 115 kV Roi Et - Phayakkhaphum Phisai - Surin lines and substations

consists of the following constructions:

a) Stringing the second circuit on the double circuit towers of the 115 kV Roi Et -

Phayakkhaphum Phisai line (under construction in TS.8 Project for commissioning by the

end of 1996), using 795 MCM ACSR conductor, a distance of approximately 84 km.

b) Construction of 115 kV Phayakkhaphum Phisai - Surin line, single circuit on double

circuit steel towers, using 795 MCM ACSR conductor, a distance of approximately 80 km.

c) Expansion of 115 kV Roi Et Substation for one outgoing line.

d) Expansion of 115 kV Phayakkhaphum Phisai Substation for two lines.

e) Expansion of 115 kV Surin Substation for one line.

f) Addition of communication system.

k nr~4 f~

Project Description

Atpresent, thLe powef deinwd in P-hrayaukkaphum Pnisai district and its vicinities is suppliedfrom several nearby 115 kV EGAT's substations via 22 kV PEA's distribution lines. A new

115 kV substation at Phayakkhaphum Phisai is being constructed, under TS.8 Project forcommissioning in 1996, to increase the capability of power supply to those areas at anacceptable reliability level and better power quality. However, since the new 115 kVPhayakkhaphum Phisai is still supplied by a single circuit line, therefore second circuit isrequired to further increase the reliability level.

For the same reason as mentioned above, the power at 115 kV to Surin Substation is stillsupplied from Buriram Substation via a 115 kV single circuit line, therefore, a new 115 kVline is required.

Stringing of the second 115 kV circuit on the underconstructed 115 kV double circuit lineRoi Et - Phayakkhaphum Phisai line and the construction of a new 115 kV PhayakkhaphumPhisai - Surin line is proposed.




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SUBPROJECT NO.13

115 KV CHAIYAPHLUM - BAMNET NARONG LINE

A. Objective

Objectives of Subproject No.13, 115 kV Chaiyaphum - Bamnet Narong line and

substations, are to provide sufficient power supply to Bamnet Narong and nearby districts

with satisfactory voltage regulation and acceptable reliability of services and also to reduce

system losses.


Proiect Scope

The scope for the 115 kV Chaiyaphum - Bamnet Narong line and substations consists of the


a) Construction of 115 kV Chaiyaphum - Bamnet Narong transmission line, single

circuit on double circuit steel towers, using 795 MCM ACSR conductor, a distance of


b) Expansion of 115 kV Chaiyaphum Substation for one outgoing line.

c) Construction of new 115 kV Bamnet Narong Substation with two 3-phase, 115-22-

11 kV power transformers, each rated OA/FA/FOA 30/40/50 MVA (land for the substation

has been purchased in TS.8 project).


Proi ect Description

The PEA 22 kV distribution lines which supply power to Bamnet Narong and nearby

districts are connected with EGAT's 115 kV Nakhon Ratchasima 1, Chaiyaphum and Sikhiu

substations at the distance of approximately 85, 70 and 90 km respectively. The high growth

of power demand is expected due to the establishment of the ASEAN Potash Mine Project.

Due to long distribution line, PEA has been facing with voltage drop problem and high

distribution losses. Automatic voltage regulators (AVR) have been installed on the 22 kV

distribution lines, however the excessive power losses still remain and the supply reliability

is not at the acceptable level.

The construction of a new 115 kV substation at Bamnet Narong will greatly increase

capability of power supply to cope with the increasing demand in this area at an acceptable

reliability level and satisfactory voltage regulation.



The proposed commissioning date is November 1997.

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SUBPOJET NO 13 11 KV HATAPHU - AMNT NAONGLIN

SUBPROJECT NO.14

115 KV UBON RATCHATHANI 2 - KANTHARALAK LINE

A. Objective

Objectives of Subproject No.14, 115 kV Ubon Ratchathani 2 - Kantharalak line and

substations, are to increase power supply capability to Kantharalak and nearby districts, to

improve reliability of services and voltage regulation, and to reduce system losses.


Proiect Scope

The scope for the 115 kV Ubon Ratchathani 2 - Kantharalak line and substations consists of

the following constructions:

a) Construction of 115 kV Ubon Ratchathani 2 -Kantharalak transmission line, single

circuit on double circuit steel towers, using 795 MCM ACSR conductor, a distance of


b) Expansion of 1 15 kV Ubon Ratchathani 2 Substation for one outgoing line.

c) Construction of new 115 kV Kantharalak Substation with two 3-phase, 115-22-11

kV power transformers, each rated OA/FA/FOA 30/40/50 MVA (land for the substation

has been purchased in TS.8 project).


Project Description

The power supply for Kantharalak and nearby districts is available from the 115 kV Si Sa

Ket Substation via PEA 22 kV distribution lines at a distance of 65 km. Due to long

distribution line, PEA has therefore installed automatic voltage regulators (AVR) to boost

the voltage at the receiving end. However high power losses is still encountered and

reliability of power supply is not at the acceptable level.

The power demand in Kantharalak and nearby districts is expected to increase at high

growth rate, because PEA has planned to expand the distribution lines to serve more remote

villages. The construction of 115 kV Ubon Ratchathani 2 - Kantharalak line will support

the PEA's distribution project and increase reliability of the electric services in this area.




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SUBPROJECT NO. 14. 115 KV UBON RATCHATHANI 2- KANTHARALAK LINE 4;3

SUBPROJECT NO.15

115 KV SURIN - SAGKHA LINE

A. Objective

Objectives of Subproject No.15, 115 kV Surin - Sangkha line and substations, are to cope

with the increasing demand in Sangkha and nearby districts with satisfactory voltage

regulation and reliability, and also to reduce system losses.


Project Scope

The scone for the 115 kV Surin - Sanackha line and zihztntions consits nf the fn1In.xAna

constructions:

a) Construction of 115 kV Surin - Sangkha line, single circuit on double circuit steel

towers, using 795 MCM ACSR conductor, a distance of approximately 49 km.

b) Construction of new 115 kV Sangkha Substation, equipped with two 3-phase, 115-

22-11 kV power transformers, each rated OA/FA/FOA 30/40/50 MVA.

c) Expansion of 1 15 kV Surin Substation for one outgoing line.

d) Land procurement for Sangkha Substation.

e) Addition of communication system.

A 4

Project Description

At present, power demand in Sangkha and nearby districts is supplied from Surin and Si Sa

Ket Substations via PEA 22 kV distribution lines at distance of 50 and 60 km respectively.

However, large voltage drop and excessive distribution line losses have been encountered

due to long distribution line. To meet the increasing power demand, further reinforcement

of the distribution system will not be economical in long-term.

The construction of a new substation at Sangkha district is proposed to increase the power

supply capability to the areas of Sangkha and its vicinity. The better quality and reliability

of services will be provided. The distribution system operation will have more flexibility

and also the distribution line losses will be substantially reduced.




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21.- AGRICUTURE AREASN.

-V

SUBPROJECT NO. 15. 115 KV SURIN - SANGKHA LINE

SUBPROJECT NO.16,17

230 KV SURAT TRANI - THUNG SONG - NAKHON SI THAMMARAT LINE

A. Objective

Objective of Subproject No.16 , 17 230 kV Surat Thani - Thung Song - Nakhon Si

Thammarat lines and substations, is to prevent line overloading on the 230 kV Khanom -

Nakhon Si Thammarat and the 115 kV Thung Song - Nakhon Si Thammarat lines.


Proiect Scope

The scope for the 230 kV Surat Thani - Thung Song - Nakhon Si Thammarat lines and

substations consists of the following constructions:

a) Construction of 230 kV double circuit Surat Thani - Thung Song - Nakhon Si

Thammarat transmission line, double circuit steel towers, using 2x1272 MCM ACSR

conductor per phase for Surat Thani - Thung Song line section (122 km) and lx1272 MCM

ACSR conductor per phase for Thung Song - Nakhon Si Thammarat line section (54 km)

for a total distance of approximately 176 km, on the right-of-way of the existing 115 kV

Surat Thani - Thung Song - Nakhon Si Thammarat line which will be dismantled. The new

230 kV line will be terminated at a new 230 kV switchyard at Thung Song, and the line

section between Thung Song and Nakhon Si Thammarat will be initially energized at 115

kV.

b) Expansion of Thung Song Substation for a new 230 kV switchyard. The new 230

kV switchyard will be constructed with the installation of two 3-phase 230/115-33 kV tie

transformers, each rated OA/FA/FOA 120/160/200 MVA, to integrate with the existing 115

kV system; and two 230 kV bays for lines to Surat Thani. The two additional 115 kV bays

are provided for lines to Nakhon Si Thammarat.

a 7

c) Expansion of 230 kV Surat Thani Substation for two outgoing lines to Thung Song

Substation.

d) Expansion of 115 kV Nakhon Si Thammarat Substation for one additional line to

Thung Song Substation.

e) Temporary installation of 3x20 MVAr 115 kV Shunt Capacitor banks at Thung

Song Substation.

f) Land procurement for the extension of the existing Thung Song Substation.


Project Description

The major transmission line which supply power to the lower part of Southern Thailand is

the 230 kV Surat Thani - Khanom - Nakhon Si Thammarat - Phatthalung -Hat Yai 2 double

circuit line. The power flow on these 230 kV lines is being increased due to the rapid

growth power demand at the lower Southern area and the cement factory expansion at

Thung Song. To maintain the reliability of power supply, the transmission system

reinforcement to cope with the increasing demand is therefore required. Due to the

difficulty to obtain a new right-of-way in these areas, the construction of 230 kV double

circuit Surat Thani - Thung Song - Nakhon Si Thammarat line on the existing right-of-way

is proposed based on the least cost solution.

To maintain the continuous power supply for Thung Song Substation, two line section of

this subproject should be constructed at two different schedules. Construction of the double

circuit 230 kV Nakhon Si Thammarat - Thung Song line section should be completed

before dismantling the 115 kV Surat Thani - Thung Song line section.



The proposed commissioning dates are June 1997 for 230/115 kV Thung Song - Nakhon Si

Thammarat line and August 1998 for 230 kV Surat Thani - Thung Song line.

E .9

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SUBPROJECTNO. 17. 23 K',' SURA THANI THU G SONG LIN

SUBROJCT O.16. 230KY HU G SNG 4K O'~SI BA~MA~T INE~A

SUBPROJECT NO.18

230 KV KHLONG NGAE - YALA 2 LINE

A. Objective

Objectives of Subproject No.18, 230 kV Khlong Ngae - Yala line and substations, are to

improve reliability of supply and to provide sufficient power supply for future demand, at

Yala, Pattani, Narathiwat and Sungai Kolok substations.


Proiect Scope

Thp -cnnp fnr thp 9Ifl kV T(hlnno Nop _ Yala line nnai q11hgttinnq rnnQktq nf tht- fnllnwino

constructions:

a) Construction of 230 kV Khlong Ngae - Yala line, double circuit steel towers, using

1272 MCM ACSR conductor, a distance of approximately 120 km. Part of the right-of-way

of the existing 115 kV Hat Yai 2 - Yala single circuit line, which will be dismantled, will be

used for the construction of the new 230 kV lines.

b) Construction of 230 kV Yala Switchyard with the installation of two 3-phase

230/115-33 kV tie transformers, rated OA/FA/FOA 120/160/200 MVA, to integrate with

the existing 115 kV system. Two 230 kV line bays are also provided to receive power from

230 kV Khlong Ngae Substation.

c) Expansion of 230 kV Khlong Ngae Substation for two outgoing lines.

d) Land procurement for the extension of Yala Substation.


Project Description

The power demand at Pattani, Yala, Narathiwat and Sungai Kolok Substations are supplied

from Bang Lang Dam and 230/115 kV Hat Yai 2 Substation via 115 kV Hat Yai 2 - Yala

single circuit line and 115 kV Hat Yai 2 - Pattani double circuit line. The peak demand of

Yala, Narathiwat and Sungai Kolok Substation is increased at 7.3 % annually. The

generation from Bang Lang Dam has been occasionally derated in case of low head of water

level or shutdown for maintenance, and the power supply for those areas rely on the long

transmission lines from Hat Yai 2 Substation. For such the cases the reliabily of supply is

not meet the criteria and the system reinforcement is therefore required. The Khlong Ngae

switching station, a new substation being implemented under the EGAT-TNB Stage II

Interconnection Project, is considered as a firm power source. The construction of the

Khlong Ngae - Yala line and substations is proposed to effectively improve the reliability of

power supply and provide sufficient power for the increasing demand in the areas of Pattani,

Yala and Narathiwat provinces.

Part of the existing right-of-way of the 115 kV Hat Yai 2 - Yala line (Hat Yai 2 Junction,

approximately 27 km. southeast of Hat Yai 2 Substation, to Yala line section, see Figure

4.14), which will be dismantled, will be used for the new proposed 230 kV line. The

remaining section of the 115 kV line from Hat Yai 2 Substation to Hat Yai 2 Junction will

be energized to maintain the right-of-way for the future use. During dismantling the 115 kV

line and constructing the new 230 kV line on this line section, the Bang Lang power plant

has to generate at least 40 MW all the time.



The proposed commissioning date is April 1998.

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;ML SBPOEC N. 8 20 V HONGME EAL LN

SUBPROJECT NO.19

230/115 KV PHANG NGA - PHUKET JUNCTION - PHUKET 2 LINE

A. Objective

Objectives of Subproject No.19, the 230/115 kV Phangnga - Phuket Junction - Phuket 2

lines and substations, are to increase the power supply capability and to maintain the

reliability and quality of power supply to Phuket Province.


Project Scope

The scope for 230/115 kV Phangnga - Phuket Junction - Phuket 2 lines and substations

consists of the following constructions:

a) Construction of 230 kV double circuit Phangnga - Phuket Junction (about 6 km

north of Phuket 1 Substation) transmission line, double circuit steel towers, using 1272

MCM ACSR conductor, initially energized at 115 kV, a distance of approximately 76 km.

This transmission line will be constructed on the right-of-way of the existing 115 kV single

circuit Phangnga - Phuket 2 line of which the line section from Phangnga to the Phuket

Junction will be dismantled. One circuit of this new double circuit line will be connected

with the remaining 115 kV line section to 115 kV Phuket 2 Substation and the other circuit

will be connected with the new 115 kV compact line to Phuket 2 Substation as described in

(b) below.

b) Construction of the 115 kV Phuket 2 - Phuket Junction compact line on one side of

the existing right-of-way of 115 kV Phuket 2 - Phuket Junction line section, which is 25

meters width from the centre to the edge of the right-of-way, single circuit using 2x795

MCM ACSR conductor, a distance of approximately 12 km. This transmission line will be

connected with one circuit of double circuit 230 kV Phangnga - Phuket Junction line as

described in (a) above.

53

c) Expansion of 115 kV Phuket 2 Substation for one incoming line from Phan-guiga.

d) Expansion of 115 kV Phangnga Substation for one additional line.

e) Land procurement for the future 230 kV substation in Phuket Province (near the

Phuket Junction).

f) Addition of communication system.

Project Description

The power demand in Phuket Province is supplied from Phuket 1 and Phuket 2 Substations

which receive power from Phangnga Substation via one 115 kV double circuit line strung

with 477 MCM ACSR conductor and one 115 kV single circuit line strung with 150 sq.mm

AAC conductor. The existing transmission system will not sufficient to serve the power

demand in the future which is expected to increase at high growth rate, since Phuket Island

is the very famous tourist spot known as Pearl of Andaman. In order to secure reliability

and quality of power supply in Phuket Province, the reinforcement of transmission system is

required.

The difficulties of obtaining a new right-of-way in the Phuket island is foreseen, therefore,

the use of existing right-of-way for the new transmission line has been planned.

Consequently, to maintain the power supply reliability during dismantling the existing

transmission line, early construction of the new transmission line is recommended, and the

construction of a double circuit 230 kV Phangnga - Phuket Junction - Phuket 2 line (initially

energized at 115 kV) on the right-of-way of the existing 1 15 kV single circuit line Phangnga

- Phuket 2 (Phuket Junction) is proposed.

Figure of the proposed line route of the Subprojeet is shown in appendix



N.~~~~ 2

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SUBPROJECT ~ -NO UKET JUNCKVPAGGA-PUETJNTON-PUT'LN

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SUBPROJECT NO.20

115 KV YALA - NARATHIWAT LINE

A. Obiective

Objective of Subproject No.20, 115 kV Yala - Narathiwat line and substations, is to

improve reliability of power supply for Narathiwat Province.


Project Scope

The scope for the 115 kV Yala - Narathiwat line and substations consists of the following

constructions:

a) Construction of 115 kV Yala - Narathiwat line, single circuit on double circuit steel


b) Expansion of 115 kV Yala Substation for one tutgoing line.

c) Expansion of 115 kV Narathiwat Substation for one incoming line.


Proiect Description

At present, the power demand in Narathiwat including Sungai Kolok district is supplied

from Yala substation via 115 kV single circuit line. The present peak demand is 31.8 MW

and expected to increase at 8.2 % annually. New additional transmission circuit is therefore

required to cope with the future high peak demand and to improve the reliability of power

supply. The construction of a new 1 15 kV Yala - Narathiwat line is proposed.



The proposed commissioning dates is April 1998.

56

4-115 KV T10 P Wr 1'A NI / ;1? .2I7lrlbt Y' ' 17 onl

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4-115KV TO 11ANG L~~~~~~~N0 DAM ___ l*fT 9

SUBPOJEC NO.20. 15 V YAA - ARATIWATLIN

SU'BPROJECT NO.21

115 KV SURAT THANI - BAN DON LINE

A. Objective

Objectives of Subproject No.21, 115 kV Surat Thani - Ban Don line and substations, are to

improve reliability of power supply, to provide sufficient power supply for future demand,

and to reduce system losses.


Project Scope

The scope for the 115 kV Surat Thani - Ban Don line and substations consists of the


a) Stringing second circuit on the existing double circuit towers of the 115 kV Surat

Thani - Ban Don line, using 477 MCM ACSR conductor, a distance of 13.4 km.

b) Expansion of 115 kV Surat Thani Substation for one outgoing line.

c) Expansion of 115 kV Ban Don Substation for one incoming line.

Project Description

The existing 115 kV Ban Don Substation is connected with 230/115 kV Surat Thani

Substation by a single circuit on double circuit steel towers 115 kV line, 13.4 km, using 477

MCM ACSR conductor. The present peak demand at Ban Don Substation is 52.4 MW and

expected to increase at the average growth rate of 6.5 % per year for the next 10 years

period.

.. 53

The reason for stringing only one circuit at the beginning is due to the fact that the power

demand in Ban Don was not too high that PEA could maintain the continuous power supply

by 33 kV distribution lines from Phunphin Substation in an emergency case when the 115

kV line trips out. With the high increasing demand, it is beyond the capability of the 33 kV

line to serve the demand in such an emergency case, therefore the stringing of second circuit

on the existing double circuit steel tower of the 115 kV Surat Thani - Ban Don line is

proposed to ensure the reliable power supply in Surat Thani area.



The proposed commissioning date is March 1998.

59

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SUBPROJECT NO 21 15 KV SURAT TiSUNSTANTDON LINE

SUBPROJECT NO.22

115 KV LAN KRABU - KHAM PHAENG PHET LINE

A. Obiective

Objective of Subproject No.22, 115 kV Lan Krabu - Kamphaengphet line and substations is

to improve the reliability and quality of power supply at Tak 1 and Kamphaengphet

Substations.


Proiect Scope

T.bs scope fior thek. 1 1 V IrxL T en vaoli 1a-.n., ;ht l "A minea slubtaofns- -cr.sts of t.eA


a) Construction of 115 kV Lan Krabu - Kamphaengphet line, double circuit steel


b) Expansion of 115 kV Lan Krabu Switchyard for two outgoing lines.

c) Expansion of 1 15 kV Kamphaengphet Substation for two incoming lines.


Project Description

At present, the power demand at 115 kV Tak 1 and Kamphaengphet Substations is supplied

from the two single circuit 115 kV lines linking Tak 1 Substation with the 230 kV

Bhumibol switchyard and 115 kV Sukhothai Substation which further connecting with 230

kV Phitsanulok 2 Substation. In case that the 115 kV Bhumibol -Tak 1 line trips out, the

power demand for these two substations will be supplied from the 230 kV Phitsanulok 2

61

Substation via the 115 kV Phitsanulok 2 - Sukhothai - Tak 1 single circuit line for a total

distances of 120 km. This case will lead to overload on the 115 kV Phitsanulok 2 -

Sukhothal line section and the unacceptable low voltage at Tak 1 and Kamphaengphet

Substations.

Furthermore, Kamphaengphet Substation is an end substation which connects with Tak 1

Substation by a single circuit 115 kV line. Therefore, there is the possibility of total

blackout in Kamphaengphet area if this line section trips out.

Therefore, the construction of 115 kV Lan Krabu - Kamphaengphet is recommended.


C. Project ImDlementation


.. 62

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SUPRJCTNO 2.11 V ANKKA -KMPAPGHE LN

SUBPROJECT NO.23

115 KV MAE MOH 3 - LAMPANG 2 LINE

A. Objective

Objective of Subproject No.23, 115 kV Mae Moh 3 - Lampang 2 line and substations is to

increase power supply capability to cope with the increasing demand at Lampang 2 and

Lamphun 2 Substations.


Project Scope

The scope for the 115 kV Mae Moh 3 - Lampang 2 line and substations consists of the


a) Construction of 115 kV Mae Moh 3 - Lampang 2 line, double circuit steel towers,

using 2x795 MCM ACSR conductor per phase, a distance of approximately 27 km.

b) Modification of 115 kV Mae Moh 3 Switchyard from Main & Transfer bus

arrangement to Breaker and a Half scheme and expansion for two outgoing line.

c) Modification of 115 kV Lampang 2 Substation from tapped substation to fully

equipped circuit breaker substation for terminating both circuits of the 115 kV double

circuit Mae Moh 2 - Lamphun 2 line and the expansion of 115 kV bays for two incoming

lines from Mae Moh 3 switchyard.


64.

Proiect Description

At present, the power demand at the 115 kV Lampang 2 Substation is supplied from one

circuit of the 115 kV double circuit Mae Moh 2 - Lamphun 2 line. The power demand at

Lampang 2 Substation is increasing highly due to the requirement of the cement factory

which is being constructed in this area. The existing 115 kV line also transmits generated

power from Mae Moh Power Plant to Lamphun and Chiang Mai areas; therefore, with the

large power demand at Lampang 2 Substation, heavy line loading on the 115 kV Mae Moh

2 - Lampang 2 line section is observed, and overloading on this line section will occur if one

circuit of the double circuit trips out. Therefore, construction of a new 115 kV Mae Moh 3 -

Lampang 2 line is proposed together with the modification and expansion of Mae Moh 3

and Lampang 2 substations.




65

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SUBPROJECT NO. 23. 115 KV MAE M01-1 3- LANIPANG 2 LINFY

SUBPROJECT NO.24

115 KV CHIANG MAI 2 - MAE TAENG LINE

A. Objective

Objectives of Subproject No.24, 115 kV Chiang Mai 2 - Mae Taeng line and substations,

are to provide more reliable power supply to Mae Taeng and nearby areas, to improve

quality of power supply and also to reduce system losses.


Proiect Scope

The scope for the 115 kV Chiang Mai 2 - Mae Taeng line and substations consists of the


a) Construction of 115 kV Chiang Mai 2 - Mae Taeng transmission line, single circuit

on double circuit steel towers, using 795 MCM ACSR conductor, a distance of


b) Expansion of 1 15 kV Chiang Mai 2 Substation for one outgoing line.

c) Construction of a new 1 1 kV Mae Taeng Substation, equipped with two 3-phase,

115-22 kV power transformers, each rated OA/FA/FOA 30/40/50 MVA.

d) Land Procurement for Mae Taeng Substation.


67,

Project Description

Tne power demand in Mae Taeng and its vicinity is presently supplied from 1 15 kV Chiang

Mai 2 Substation and Mae Ngat small hydro power plant through PEA 22 kV distribution

system. According to the demand forecast in this area, the existing PEA system will not

meet the expected increasing demand, and will not be able to support the PEA's rural

electrification program to expand its distribution system to several remote villages in this

area.

To meet the increase of power demand at Mae Taeng and its vicinity with more reliable

power supply, the construction of 115 kV Chiang Mai 2 - Mae Taeng line and new

substation at Mae Taeng is proposed.



The proposed commissioning date is June 1998.

3

d_WWNN RESERVE FOREST AREAS (PERMIT PENDING) ?. , u ivWs^..l _ ~~AGRICUTURE AREAS ; "

0~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 12

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SUBPOJEC NO.24. 15 hV CHANG TAI A TEGLNEADSBSAIN

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SUBPROJECT NO.25

230 KV RATCHABURI 2 - PRACIIAUB KHIRIKlHUN LINE

A. Objective

Objectives of Subproject No.25, 230 KV RATCHABURI 2 - PRACHAUB KHIRIKHUN

LINE is to improve in old right of way.


Project Scope

The scope for the 230 KV RATCHABURI 2 - PRACHAUB KHIRIKHUN LINE consists of

thPi fnfl%IC7tAnCin rAnIItQrticnn -

Construction of circuit steel towers, using 1272 MCM ACSR conductor, a distance

of approximately 11 km. on old right-of-way of the existing.

Figure of the proposed line route of the Subproject is shown in appendix.

79-

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S-T NO. 2. 23 K A R 2 - P1 AB KT U LINE

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SUBPROJECT NO. 25. 230 KV RATCIJABURI 2pRACHAUB KHIRIKHUN LINE

3. Legal and Administrative

Environmental Impact Assessment (EIA) is not required under current Thailand law and

regulation for the Transmission System Expansion Project No. 9 and TNB StageIl Inter

Connection. The EIA for the transmission system will be expected only when all or a

portion of the transmission line routes are located in Watershed classification class 1 B (or

wildlife sanctuary area, or national park area, or mangrove area). The project routes do not

traverse any of these. This report is a focused environmental analysis of environmental

impacts of project components and their mitigation measures as required by the World Bank.

Land Use Permits: Land use permits are required from the Royal Forest Department for

projects involving "forest areas." There are twice kinds of "forest" classification: protected

forest and reserved forest and economic. Environmental Impact Assessements are required in

order to obtain land use permits in protected forest. EIA's are not required to obtain land use

permits in reserve forest and economic.

EGAT obtains permits for land use in forest areas in the following manner:

i) Map sheets showing reserve and protected forest areas are obtained from the Royal

Forest Department.

ii) EGAT Power System Planning Division lays out the transmission line route on

1:250,000 scale maps.

iii) EGAT Survey Division translates these routes onto 1:50,000 maps and then

surveys the routes in the field . When the routes are laid out on 1:50,000 scale maps, the

reserve and protected forest areas, and other areas prohibited or to be avoided according to the

EGAT environmental route planning policy are identified, and the routes changed as

necessary. A ground survey of the line route is then done, and the line is again rerouted as

necessary to avoid structures, for instance.

iv) The information the on route is then sent to the EGAT land Division. The land

Division then applies to the Royal Forest Department for permits to traverse reserve or

protected forest areas. EGAT goes into the field with the Forest Officials to survey the

p ..

*1%

identified forest areas. This survey is required under Royal Forest Department regulations.

The information gathered in the joint EGAT/ Royal Forestry Department survey is used in the

permitting process. In certain cases, EGAT would be requested to pay for compensation to

the Royal Forest Department. All cases are reviewed by the Director General of the Royal

Forest Department and the Ministry of Agriculture and Cooperatives.

v) After the permit is granted by the Royal Forest Department, EGAT and the Royal

Forest Department do a detailed inventory of the forest resources, trees to be cut are marked,

and EGAT signs the survey report.

vi) The Forest Industry Organization (under the Department of Agriculture and

Cooperative) does the actual right of way clearing.

3.1 The Environmental Impact Assessment determined by the project features.

The Ministry of Science, Technology and Environment authorized through the Enhancement

and Conservation of Act B.E. 1992 has issued the announcement on types and scales of

project or activities to be undertaken by the government, state enterprise or private sectors

that require the analysis on environmental impacts assessment report in the first issue (1992)

of which the list attached as Table 2.

Moreover, The Ministry has further issued an addition notification for types and scales of

project or activities that are required for environmental impact assessment report in the

second issue (1992) wherein more details are stated as shown in Table 3

7 3

Table 2 Notification for Types and Sizes of Projects or Activities Requiredan Environmental Impact Assessment Report

Items Types of Project or Activities Scales1 Dam and Reservior Storage volume of 100 million cubic meters

(MCM) or more or storage surface area of15 square-kilometers or more

2 Irrigation Irrigation area of 80,000 rais (12,800hectares) or more

3 Commercial Airport All scales4 Commercial Port and Harbour With capacity for vessels of 500 tons-gross

or more5 Mass Transit System and Expressway as All scales

defined by the Mass Transit andExpressway Act or Project similar toExpressway or Rail Type Mass TransitSystem

6 Highway or road as defined by the All project with equivalents to or above theHighway Act, Passing through minimum standard of rural highwayfollowing areas: including roaded expansion(a) Wildlife Sanctuaries and WildlifeNon-Hunting Areas as defined by theWildlife Conservation and ProtectionAct.(b) National Park as defined by NationPark Act.(c) Watershed area classified as class 2by the Cabinet Resolution(d) Mangrove Forests Designated asNational Forest Reserve(e) Coastal Area within 50 meters fromthe Maximum Sea Level

7 Coastal Reclamnation All scales8 Mining as defined by the Mineral Act All scales9 Thermal Power Plant Capacity of 10 megawatt or more10 Hotel or Resort Facilities in areas 80 rooms or more

adjacant to rivers, coastal areas , lakes orbeaches or in the vicinity of NationalParks or Historical Parks

11 Building in areas adjacant to rivers, Height of 23 meters or more or total of allcoastal areas , lakes or beaches or in the floors area or area of any floor in the samevicinity of National Park or Historical building isPark 10,000 square meters or more

rp ,l

Table 2 (Con'd)Items Types of Project or Activities Scales

12 Residential Condominium as defined hv RO iinits or morethe Condominium Act.

13 Land appropriation for residential or Land plot is 500 units or more or total landcommercial purpose area exceed 100 rais (16 hectares)

14 Hospital or Nursing Home:(a) In case locates in area adjacant to (a) in-patient's bed of 30 beds or morerivers , coastal areas , lakes or beaches(b) In areas other Than (a) (b) in-patient's bed of 60 beds or more

15 All Project or Activities in Watershed All scalesarea classified as lB by the CabinetResolution

16 Industries(1) Petrochemical Industry Using raw materials which is produced from

oil refinery and/or natural gas seperationwith production capacity of 100 tons/day ormore

(2) Oil Refinery All scales(3) Natural Gas Seperation All scales(4) Chlor-Alkaline Industry requiring Production capacity of each or combinedNaCl as raw material for production of productes of 100 tons/day or moreNa2CO3 , NaOH, HCI, Cl2 , NaOCl andBleaching Powder(5) Irons and/or Steel Industry Pr6duction capacity of 100 tons/day

(production capacity calculated by usingproduction capacity of furnace in ton/hourmultiplied by 24 hours)

(6) Cement Industry All scales(7) Smelting Industry other than Iron Production capacity of 50 tons/day or moreand Steel(8) Pulp Industry Production capacity of 50 tons/day or more(9) Pesticide Industry or industry All scalesproducting Active Ingredient bychemical process(10) Chemical Fertilizer Industry using All scaleschemical process in production

Source : Notifications of Ministry of Science, Technology and Environmental, August 24,BE 2535 (1992) issued under the Enhancement and Conservation of National EnvironmentalQuality Act BE 2535 (1992)

r1Lr

Table 3 Additional Types and Scales of Projects or Activities to be required for anEnvironmental Impact Assessment Report

Items Types of Project or Activities Scales1 Sea dumping All scales2 Any building locating at the riversides, seashore Scale of building:

, seaside, lake or nearby National Park, (1) The height is above 23 m.Historical sites which would be affected on the (2) The total area of all storeys orenvironmental quality either one is equal to 10,000 sq.m.

and above3 Condominium specified in the law Those with over 80 rooms4 Land estate for residence or for commercial 500 plots and above or the area of

purpose plot is over 100 rais5 Hospital or Public health stations

(1) Those located at the riversides , seasides, 5.1 Having 30 patient beds and abovelakes or seashore which would affect on theenvironmental quality(2) Those are not in (1) 5.2 Having 60 patient beds and above

6 Industry with some toxic or pesticide through All scaleschemical process

7 Industry concerning the production of chemical All scalesfertilizer with chemical process

8 Highway or road as specified in the law and pass All scales equivalent or lower thanthrough: the standard of rural highway

including the embankment to beconstructed or the existing one

(1) Wildlife sanctuary and non-hunting area(2) National Park(3) Watershed area class II by the Cabinetresolution(4) Mangrove forest area identified as Nationalforest reserve(5) Coastal area within 50 m. from the maximumwater level

Source: Notifications of Ministry of Science, Technology and Environmental, September 9BE 2535 (1992) issued under the Enhancement and Conservation of National EnvironmentalQuality Act BE 2535 (1992)

3.2 The Environmental Impact Assessment or Initial Environmental

Examination determined by the area features

(a) Those areas required for the Environmental Impact Assessment is the

conservation forest area identified by law and the cabinet concerning the natural resource

conservation classified as 4 types:

1) Wildlife sanctuary announced through the Wildlife Preservation and

Protection Act 1992.

2) National Park through the Act concerned in 1961.

3) Watershed area class 1 specified by the NEB through the Cabinet

Resolution.

4) Conservation area specified for land utilization in mangrove forest area

of Thailand through the Cabinet Resolution dated December 15, 1987.

(b) Areas required for the Initial Environmental Examination is the addition

forest conservation area (C) and submit a report to the Royal Forest Department for

permission to use area of concern .

77y

4. Route Selection Criteria and Mitigation Strategies

4.1 EGAT'S Environmental Guidelines for Transmission System.

For the construction of transmission system i.e., in selecting the line routes for

transmission lines and substation sites, EGAT use to minimize the impact on the

environmental elements, like forest, wildlife, watershed area, population, archeological

sites and scenery to the most feasible environmental criteria. The EGAT's

environmental guidelines for transmission systems as follows:

4.1.1 Route Selection

1) Not locating a line through the following

(1) Restricted watershed area class 1A, wildlife sanctuary, national park and

mangrove forest area

(2) Holy places, archaeological sites and government site

2) Avoiding to locate a line through the following

(1) Watershed area class IB, the addition forest conservation area (C) by laws

and other conservation areas

(2) Community and developed areas

3) Avoiding to locate a line running parallel with, or close to telephone and

telegraph cables in a long distance.

4) Avoiding to locate a line near an airport.

73

4.1.2 Vegetation Clearance

Those trees existing in the area along the transmission line mentioned will be cut down in the

basis of necessity for the construction work and maintenance of the transmission line only

and in compliance with the above mentioned criteria. And those trees with possibility to fall

down into the transmission line area must be cut down since it would cause any danger to the

transmission system.

Tree cutting down will be considered in the area whereas the transmission system would be

possibly affected and it will be done in compliance with the criteria stated in the meeting

solution on the transmission line assembly.

1) Trees and plants will be cut down to the level of soil surface and not permitted to

grow furthermore in the area where located the transmission posts and the surrounding bases

within a distance of 4 meters except those to be stamped as stated in the Forest Regulations

can be kept the height at not exceeding 0.30 meters above ground.

2) Trees along the transmission lines will be completely cut for 6 meters wide (3 m.

far from each side started from the center of the transmission post).

3) Trees/plants outside the mentioned areas in (1) and (2) will be kept at 0.30 meters

high above ground.

4.2 EGAT Policy on Post-Project Land Use

According to EGAT regulations the landowners post-project rights on land use will vary

according to the degree of impact of the different components of a project. Land used as

premises land for substations and other fixed structures will be definitely bought from the

owners directly.

Land used as bases for transmission lines towers will remain property of the landowners but

will have to be permanently cleared of any crop and tree. Although these areas will remain

property of the landowners these latter will lose all cultivation rights on them. Also in this

case these areas will be compensated in full to their original owners or users.

Land included in the right of way of transmission lines instead, will be given back to their

previous owners after construction. After construction the landowners will retain annual crops

cultivation rights on these lands. However, the right to cultivate perennial crops and trees will

be subjected to a number of limitations. These are:

80

1. 115 kV AND 230 kV TRANSMISSION LINE (GENERAl)

Land include in the right of way of transmission line as a 24 meters wide corridor for 115 kVtransmission line and a 40 meters for 230 kV transmission line. The right to cultivateperennial crops and trees will be subjected to a number of limitations as follow.

1) No building of household and other structure in the right of way oftransmission line.

2) Trees and plants will be cut down to the level of soil surface and notpermitted to grow furthermore in the area where located the transmission posts and thesurrounding bases within a distance of 4 meters except those to be stamped as stated in theForest Regulations can be kept the height at not exceeding 0.30 meters above ground.

3) Trees along the transmission lines will be completely cut for 6 meters wide(3 meters each side started from the center of the transmission post) and kept the height at notexceeding 0.30 meters above ground.

4) Trees and plants outside the mentioned areas in 2) and 3) (3-12 meters eachside started from the center of the transmission post for 115 kV and 3-20 meters far fromeach side started from the center of the transmission post 230 kV Transmission Line) will bekept at 3 meters high above ground.

5) Those trees existing in the area along the transmission line mentioned willbe cut down in the basis of necessity for the construction work and maintenance of thetransmission line only and in compliance with the above mentioned criteria in (1), (2), (3) and(4) but it must not be the obstacle for the maintenance work.

6) Those trees with possibility to fall down into the transmission line areamust be cut down since it would cause any danger to the transmission system.

Criteria for Land Use and Vegetation Clearance230 KV Transmission Line System (40 m Right of Way)

_ ~~~~~~~~~~~~~~~~~~~~~~~~I

3m 3m 3mn 3m

(2) 3 173 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~3

20

1. No tree growing, except seasonal and grain crop are allowed within 3 m wide of corridor.2. Cash crop is allowed with height less than 3 m in the outter area of 3 m limited zone from mid line.

CO

I

Criteria for Land Use and Vegetation Clearance115 KV Transmission Line System (24 m Right of Way)

3m 3m 3 m 3m

3 12

1. No tree growing, except seasonal and grain crolp are allowed within 3 m wide of corridor.2. Cash crop is allowed with height less than 3 m in the outter area of 3 m limited zone from mid line.

2. 500 kV TRANSMISSION LINE (GENERAL)

Land include in the right of way of transmission line as a 30 meters wide corridor for 500 kVtransmission line. The right to cultivate perennial crops and trees will be subjected to anumber of limitations as follow.

I) No building of household and other structure in the right of way oftransmission line.


3) Trees along the transmission lines will be completely cut for 6 m. wide (3meters each side started from the center of the transmission post) and kept the height at notexceeding 0.30 meters above ground.

4) Trees and plants outside the mentioned areas in 2) and 3) (3-18 meters eachside started from the center of the transmission post) will be kept at 3 meters high aboveground.

5) Some cash crops are excluded with the following conditions:

(1) those grown in a distance of 3 meters far from the center oftransmission post for both sides will be kept at not exceeding 3 meters high.




6) Those trees existing in the area along the transmission line mentioned willbe cut down in the basis of necessity for the construction work and maintenance of thetransmission line only and in compliance with the above mentioned criteria in (1), (2), and (3)but it must not be the obstacle for the maintenance work.


84-

'1 L' 14tt IUt I LtdiIu Uav . llU V ULtatliul tk1ALd1 411ce

500 KV Transmission Line System (60 m Riglht of Way)

lOin 7m \~~~~~~~~~~~~~~~~~~<~~~~4 ,//~~~~~~~~( / 1~~~~~I0 ni__ _ _ _ __ _ _ _ __________ _ _ _ _ _ _ _ _ _ _

3 m -* mI) ~

X~~~~~~~~~~~~~~~~~~~-~4 5 3

(5) (4) (3) (2) (1)311 27 22 18 3 3 l I 222 27 30

1. No ti-ec gi-owilg, , except seasonal an(d grailn ClOp are allowed ivitiniti 3 in wide of corridor.

2. Cash crop is allovved with heighit less thani 3 In in the outter ar-ea of 3 in limited zone fi-om nmid line.3. Cash cl-oil is allowved withi hciglit less than 5 m in the outter arca of 18 in limited zone froni mind line.4. Cash clrop is allowed witih hicighit less thani 7 m in the outter area of 22 in limited zone froni mid line.

5. Cash cr-op) is allowed witih heighit less thian 10 m in the outter area of 27 mi limited zone from mind line.6. No planting of sugarcane in right of way

CID

3. 115 kV TRANSMISSION LINE IN SOUTHERN AREA


1) No building of household and other structure in the right of way oftransmission line. Except 12-25 meters far from each side started from the center of thetransmission post which were built before EGAT annoucment for construction thetransmission line.








6) Those trees existing in the area along the transmission line mentioned willbe cut down in the basis of necessity for the construction work and maintenance of thetransmission line only and in compliance with the above mentioned criteria in (1), (2), and (3)but it must not be the obstacle for the maintenance work.


Criteria for Land Use and Vegetation Clearance115 KV Transmission Line System, Southern Thailand (50 m Right of Way)

10 m lo10m______________________________________ _

7m 7m

(4) (3) (2) (1)25 20 12 3 3 .- - , 2 _ 2

1. No tree growing, except seasonal and grain crop are allowed within 3 m wide of corridor.2. Cash crop is allowe(d with height less than 3 in in the outter area of 3 m limited zone from mid linc.3. Cash crop is allowedl with height less than 7 m in the outter area of 12 m limited zone fronm mid line.4. Cash crop is allowved with height less than 10 m in the outter area of 20 m limited zone from mid line.

.-d

4. 230 kV TRANSMISSION LINE IN SOUTHERN AREA


1) No building of household and other structure in the right of way oftransmission line. Except 20-25 meters far from each side started from the center of thetransmission post which were built before EGAT annoucment for construction thetransmission line.





(i) those grown in a distance of 3 meters far from the center oftransmission post for both sides will be kept at not exceeding 3 meters high.

(ii) those grown in a distance of 20 meters far from the center oftransmission post for both sides will be kept at not exceeding 10 meters high.

6) Those trees existing in the area along the transmission line mentioned willbe cut down in the basis of necessity for the construction work and maintenance of thetransmission line only and in compliance with the above mentioned criteria in (1) and (2) butit must not be the obstacle for the maintenance work.


Criteria for Land Use and Vegetation Clearance230 KV Transmission Line System, Southern Thailand (50 m Right of Way)

10 m I ~~~~~~~~~~~~~~~~~~~~~~10 im

3 m

(3) (2) (1)25 20 3 3 17 21_

1. No tree growing, except seasonal and grain crop are allowed within 3 m wide of corridor.

2. Cash crop is allowed with height less than 3 m in the outter area of 3 m limited zone from mid line.

3. Cash crop is allowed with height less than 10 m in the outter area of 20 m limited zone from mid line.

CID

5. Environmental Issues

There is no watershed area class 1A and 1B, wildlife sanctuary, national park ,mangrove

forest area and the addition forest conservation area (C) near any transmission line of

subproject on Transmission System Expansion Project No. 9 and TNB Stage II Inter

Connection Project, so these lines are not required to have Environmental Impact

Assessments or Initial Environmental Examination. The transmission lines will not pass

through the environmentall , sensitive areas.

Environmental Impact on Water Resources: Potential impacts of a transmission system on

water quality are related to construction activities: surface run-off from construction sites;

wastewater from the temporary office and construction camps; and, wastewater contaminated

with oil or grease from machinery which will be mitigated . The construction sites, temporary

office and construction camp will locate more than 100 meters far from water resource or

stream and all of slope area is less than 45 degree. The construction will follow the EGAT'S

Environmental Guidelines for Transmission System.

Forest resources: There are 25, with a length of approximately 159.55 kilometers, that pass

through the forest. There are no watershed area class 1A and I B, wildlife sanctuary, national

park ,mangrove forest area or addition forest conservation area (C) near any transmission line

of subproject on Transmission System Expansion Project No. 9. TNB Stage II Inter

Connection Project is 3 tranmission lines ,a distance of approximately 213.5 kilometers, that

pass through the forest .Many of these 'forest areas' have already been cleared for agriculture

are other purposes . The attached route maps show the actual conditions found in walk-

throughs. There is no watershed area class 1A and IB, wildlife sanctuary, national park,

mangrove forest area or addition forest conservation area (C) near any transmission line of

subprojects .

Wildlife: There are 159.55 kilometers of Transmission System Expansion Project No. 9 and

213.5 kilometers of TNB Stage II Inter Connection Project that pass through the forest that

are not significant for conservation. Many of the reserve forest areas where the transmission

lines traverse have already been cleared for agriculture and other purposes (see maps). The

wildlife are mostly small in size and they can adjust well to various human activities.

Land Use: The project construction phase will cause the loss and limitation of agricultural land

use in the ROW; however, the impact is on a small total land area because most of the crops

have a short growing season and they do not exceed the height restrictions for vegetation in the

right of way. Transmission System Expansion Project No. 9 and TNB Stage II Inter

Connection Project have tranmission lines which pass through the agricultural land totalling

about 1,121.45 and 360.3 km . The Maintenance of the right of way will follow the EGAT

policy on post-project land use.

Cultural and Esthetic Resources: There were no cultural or esthetic resources that would

potentially be impacted along the Transmission System Expansion Project No. 9 and TNB

Stage II Inter Connection Project.

PCB Management: Transmission System Expansion Project No. 9 and TNB Stage II Inter

Connection Project will not involve replacement of equipment potentially contaminated with

PCB. EGAT has surveyed all potentially contaminated electrical equipment.

Electromagnetic Frequency (EMF): A full discussion of EMF effects and EGAT transmission

lines is included in the Environmental Impact Analyses of the Greater Bangkok Area, and the

Environmental Report for 500 KV Transmission Line for IPP's.

91

7. Mitigation Measures

Construction: the following mitigation measures are used during construction of the power

lines.

1. Avoiding to construct a new access for construction purpose, but trying to

utilize the existing tracts.

2. Not cutting the trees over EGAT's criteria.

3. Clean up the construction sites upon the completion of the construction work.

4. Along the valley, cutting down, only where necessary, the trees considerably to

be hazardous to the stability of the transmission system.

5. The landowners are permitted to cultivate the economic crops at EGAT 's

criteria along the right of way corridor.

6. Upon completion of transmission line construction work, ground cover around

the towers will be planted and also land contouring when required to provide a protective

covering for the earth and to prevent the soil erosion.

Natural Resources: Foundation towers and construction activities including transportation of .

construction materials, material storage and worker housing would be located at least 50

meters away from surface water resources to avoid soil erosion. In case it is necessary to use

areas closer to water resources, soil barriers would be built to block erosion and

sedimentation. Vegetative cover would be replaced along streambanks and the surrounding

project site if disturbed, to prevent soil erosion. In all areas, sanitary latrines will be

constructed for workforce and temporary offices, and good housekeeping measures will

minimize potential water contamination due to oily waste or chemicals.

Forest Resources: The following mitigation measures would be followed: (i) deforestation to

be done only in the right of way ii) reforestation is the responsibility of EGAT, the area of

reforestation would be more than the area of national forest reserve used for the ROW; iii) in

case private land is used in construction, it is the responsibility of EGAT to contact the owner

92)

anTd pay fair compensation. Many of the 'forest areas' along the routes have already been

cleared for agriculture and other purposes (see map section).

Wildlife: The impacts can be controlled by: i) deforestation only in the right of way

area; ii) prohibition on disturbing wildlife, including nests, eggs, holes, hollows and other

habitat; iii) prevention of noise pollution by limiting work hours between 8.00 am and 16.00

pm., all work to be forbidden at night.

Land Use: EGAT would plan all the project activities including material transportation, pole

mounting and others in the dry season, because most of the crops would already have been

harvested. Removal of agricultural plants (particularly perennials) would be done only as

necessary and compensation paid. Farmers would be allowed to grow short-lived crops with

heights of less than 3 meters in the ROW after construction.

Monitorini!:

The following monitoring plan will be adopted to track the effectiveness of mitigation

techniques, and to address recognized problems in an appropriate and timely manner. This

regular scheduled monitoring program will consist chiefly of visual inspections during

construction and operation for:

o erosion along access roads, substation and transmission tower foundations;

o encroachment of settlements within rights of ways, encroachment of settlements

within protected areas via transmission line access roads, exploitation of forest

resources in protected areas via access roads;

o vegetation clearances below transmission lines, and invasion of exotic species along

right of ways;

o transforner fluid leakage and spills.

ABBREVIATIONS

ACSR - Aluminum Conductor Steel Reinforced

cct-km - Circuit-Kilometer

DC/ST - Double Circuit/Steel Tower

DSM - Demand Side Management

EGAT - Electricity Generating Authority of Thailand

F.C. - Foreign Currency

IDC - Interest During Construction

IPP - Independent Power Producer

L.C. - Local Currency

MTHB - Million Baht

MEA - Metropolitan Electricity Authority

MCM - Thousand Circular Mils

MVA - Megavolt-ampare

MVAR - Megavolt-ampere Reactive

MW - Megawatt

NEPO - National Energy Policy Office

NESDB - National Economic and Social Development Board

NESDP - National Economic and Social Development Plan

PDP - Power Development Plan

PEA - Provincial Electricity Authority

TDRI - Thailand Development Research Institute

TLFS - Thailand Load Forecast Subcommittee

THB - Baht

TNB - Tenaga Nasional Berhad

USD - US Dollar

VAT - Value Added Tax

W/O - Without

9.4

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