Transmission System Development and Expansion Projects

Approved projects

1. Bulk Power Supply for the Greater Bangkok Area Project, Phase 2 (GBAS2)

          Being a successive project of the Bulk Power Supply for the Greater Bangkok Area Project, Phase 1, the investment cost of GBAS2 is 9,170 million Baht consisting of the construction of transmission lines of 89.03 circuit-kilometers and a new substation, expansion of 4 substations, installation of transformers of 9,200 MVA and capacitor bank of 672 MVAr, and 21 miscellaneous works relating to the transmission system expansion. As of December 2020, the progress of the project was 89.84%. The project is expected to be completed in 2021..

2. Transmission System Development Project for Power Purchase from IPPs (IPPP)

          The purpose of this transmission system development project is to accommodate the power purchase from the IPP power plants under 4 sub-projects with the installed capacity of approximately 4,400 MW. The project costs 7,958 million Baht and comprises the construction of transmission lines of 169.40 circuit-kilometers and 2 new substations, expansion of 6 substations, installation of transformers totaling 1,000 MVA, and 4 miscellaneous works relating to the transmission system expansion. As of December 2020, the progress of the project was 76.84%. The construction of the transmission system for power purchase from 3 IPPs was completed. The construction of the transmission system for the power project of Burapa Power Generation Co., Ltd. to support the Eastern Economic Corridor (EEC) which the company is responsible for the cost of 2,120.0 million Baht for the improvement of new transmission facilities (NTF) is in process and is expected to be completed in 2026.

3. Transmission System Expansion and Renovation Project, Phase 1: Substation (RSP1)

          The project involves the improvement, replacement, or addition of equipment and control building of the substations. The project costs 3,815 million Baht for the renovation of 15 substations. As of December 2020, the progress of the project was 85.60%. The project is expected to be completed in 2023.

          The construction of 3 transmission system sub-projects has been completed except for the sub-project of the transmission system to accommodate the power purchase from the thermal power plant of the National Power Supply Co., Ltd. of which the power purchase agreement has not been signed and is awaiting the cabinet resolution on dispute settlement by arbitration process and approval on the new EHIA.

4. Main Transmission System Expansion Project for Power Purchase from SPP Cogeneration Power Plants, Based on Request for Proposal 2010 (SPPC)

          This project is the expansion of main transmission system to accommodate the power purchase from SPP’s cogeneration power plants. The project costs 10,610 million Baht and comprises the construction of transmission lines of 490 circuit-kilometers and a new substation, expansion of 93 substations and improvement of control and prevention system of the substations, and installation of transformers totaling 2,500 MVA. As of December 2020, the progress of the project was 91.96%. The project is scheduled to be completed in 2023.

5. Transmission System Renovation and Expansion Project, Phase 1: Transmission Line (RLP1)

         This project involves the renovation of aged transmission lines and expansion of transmission lines. The project costs 9,850 million Baht and comprises the construction of 15 transmission lines of 331 circuit-kilometers and renovation and expansion of 14 substations. As of December 2020, the progress of this project was 91.75%. It is scheduled to be completed in 2024.

6. Transmission System Development Project in the Area of Loei, Nong Bua Lam Phu, and Khon Kaen Provinces for Power Purchase from Lao PDR (LNKP)

          The purpose of the transmission system development project is to accommodate power purchase from Xayaburi Hydropower Plant in Lao PDR to enhance the security of the electricity system. The project costs 12,060 million Baht and comprises the construction of transmission lines of 505 circuit-kilometers and 3 new substations, expansion of 4 substations, and installation of transformers totaling 3,067 MVA. As of December 2020, the progress of this project was 96.614%. It is scheduled to be completed in 2022.

7. Transmission System Renovation and Expansion Project, Phase 2 (RTS2)

          The project costs 21,900 million Baht and comprises the construction of 11 transmission lines of 1,267 circuit-kilometers as well as construction, renovation, and expansion of 19 substations. As of December 2020, the progress of this project was 61.26%. It is scheduled to be completed in 2025.

8. Transmission System Improvement Project in Eastern Region for System Security Enhancement (TIPE)

          The purposes of this transmission system improvement project are to enhance security of the power system in the Eastern part of the country, to cope with the increase of new power plants, and to promote the expansion of industry and tourism of the region. The project costs 12,000 million Baht and comprises the construction of transmission lines of 469.664 circuit-kilometers and 3 new substations, expansion of a substation, installation of transformers of 3,000 MVA, and 8 miscellaneous works relating to the expansion of the transmission system. As of December 2020, the progress of this project was 38.30%. It is scheduled to be completed in 2024.

9. Bulk Power Supply for the Greater Bangkok Area, Phase 3 (GBA3)

          Being a successive project of the Bulk Power Supply for the Greater Bangkok Area, Phase 2 (GBA2), the objectives of this project are to respond to the increasing demand for electricity in the Greater Bangkok area and to enhance security of the power system of Thailand. The project costs 12,100 million Baht and comprises the construction of transmission lines of 194.91 circuit-kilometers and 2 new substations, expansion of 4 substations, installation of transformers of 8,100 MVA and capacitor bank of 288 MVAr, and 27 miscellaneous works relating to the expansion of transmission system. As of December 2020, the progress of this project was 58.71%. It is scheduled to be completed in 2025.

10. Transmission System Expansion Project, Phase 12 (TS12)

          TS12 is a successive scheme of Transmission System Expansion Project, Phase 11 (TS11). The project costs 60,000 million Baht and comprises the construction of transmission lines of 3,127.927 circuit-kilometers and 7 new substations, expansion of 75 substations, installation of transformers of 25,700 MVA, capacitor bank of 1,770 MVAr, Static Var Compensator (SVC) inductive of 50 MVAr/Capacitive of 100 MVAr, and 182 miscellaneous works relating to the transmission system expansion. As of December 2020, the progress of this project was 52.50%. It is scheduled to be completed in 2025.

11. Transmission System Improvement Project in Western and Southern Regions to Enhance System Security (TIWS)

         The project involves the construction of 500 kV transmission lines and additional improvement of the 230 kV transmission systems to cope with the increasing electricity demand in the Southern part of Thailand in the long run. The project increases the capability of the transmission system from the West and the Central parts of Thailand to the South and promotes the expansion of business, industry, and tourism. Moreover, the project will solve the problem of power outage in the South. The project costs 63,200 million Baht and comprises the construction of transmission lines of 2,192 circuit-kilometers and a new substation, expansion of 8 substations, installation of transformers totaling 4,000 MVA, capacitor bank of 360 MVAr, shunt reactor of 1,760 MVAr, Static Var Compensator (SVC) inductive of 140 MVAr/Capacitive of 250 MVAr, and 10 miscellaneous works relating to the transmission system expansion. As of December 2020, the progress of this project was 47.08%. It is scheduled to be completed in 2024.

12. Transmission System Improvement Project for System Security Enhancement of the Northeast, Lower North, and Central Parts, including Bangkok Metropolitan (TIEC)

          The objectives of the project are to enhance security of the power system, to support renewable and alternative power projects with the capacity of 13,927 MW, and to support the ASEAN Power Grid (APG) Project. The project costs 94,040 million Baht and comprises the construction of the transmission lines of 2,645 circuit-kilometers, expansion of 13 substations, installation of transformers totaling 12,000 MVA, shunt reactor of 2,420 MVAr and Static Var System (SVC) inductive of 700 MVAr/Capacitive of 1,500 MVAr, and 2 miscellaneous works relating to the transmission system improvement. As of December 2020, the progress of this project was 23.18%. It is scheduled to be completed in 2030.

13. Transmission System Improvement Project for the Upper Northern Region for System Security Enhancement (TIPN)

          The project involves the construction of additional 500 kV and 230 kV transmission lines to support the rising demand for electricity in Chiang Mai and Lamphun Provinces, enhance the system security, respond to the increasing electricity demand in the long run, and support the power plant projects in neighboring countries and the ASEAN Power Grid Project (APG). The project costs 12,240 million Baht and comprises the construction of transmission lines of 420 circuit-kilometers, construction of a new substation, expansion of 7 substations, and installation of transformers of 3,350 MVA. As of December 2020, the progress of this project was 19.32%. It is scheduled to be completed in 2024.

14. Transmission System Project for South Bangkok Power Plant Replacement Project, Phase 1 (SBR1)

          This project involves the construction of the transmission system to support the new power plant to replace 1,330 MW South Bangkok Thermal Power Plant, Units 1-5, which were decommissioned in 2019. The project costs 1,090 million Baht and comprises the construction of 230 kV underground transmission lines of 1.0 circuit-kilometer from the switchyard of the power plant to South Bangkok Substation and the expansion of South Bangkok Substation. As of December 2020, the progress of the project was 74.88%. It is scheduled to be completed in 2022.

15. Transmission System Improvement Project in Lower Southern Region to Enhance System Security (TILS)

         The project involves the construction of the transmission system of 500 kV from Surat Thani Province to Songkhla Province and additional improvement of the transmission system of 230 kV and 115 kV. The objectives of the project are to enhance security of the power system of the South to cope with the electricity demand of household, business, industry, and tourism after the formation of the ASEAN Economic Community (AEC), to support the link of the baseload power plants or renewable power plants according to the government policy in response to the policy of fuel diversification for electricity generation, to solve the problem of annual overhaul of natural gas pipelines, and to support the ASEAN Power Grid (APG) and power purchase from neighboring countries. The project costs 35,400 million Baht and comprises the construction of transmission lines of 1,409 circuit-kilometers and 2 new substations, expansion of 9 substations, and installation of transformers of 4,000 MVA. As of December 2020, the progress of this project was 5.617%. It is scheduled to be completed in 2026.

16. Transmission System Development for Pha Chuk Hydropower Plant Project (PCHP)

          The project aims to promote the use of renewable energy in order to decrease the amount of imported energy. The project costs 211.50 million Baht and comprises the construction of transmission lines of 115 kV Sirikit - Uttaradit as well as Pha Chuk Substation of 7 circuit-kilometers, construction of Pha Chuk Substation, and improvement of 2 substations. As of December 2020, the progress of this project was 52.688%. It is scheduled to be completed in 2021.

17. Transmission System Development Project for Power Purchase from Independent Power Producers, Phase 3 (IPP3)

          The objectives of the project are to link the power purchase from the Independent Power Producers to EGAT’s system to cope with the growing electricity demand in the Eastern and Central parts of the country, to increase agility in the control and power supply in the Eastern region, and to solve the problem of power shortage when the power plants need to disconnect from the system and to close for overhaul. As of December 2020, the progress of this project was 12.186%. It is scheduled to be completed in 2023. Two IPP projects were selected, namely the projects of Gulf SRC Co., Ltd. with the capacity of 2,500 MW which will be in commercial operation on March 1, 2021 and Gulf PD Co., Ltd. with the capacity of 2,500 MW which will be in commercial operation on March 1, 2023.

18. Transmission System Improvement Project by Installation of Energy Storage System at Chaiyaphum and Lopburi Provinces for Mitigating Impact from Renewable Energy (ESCL)

          The purposes of this project are to maintain security and stability of EGAT’s power system in terms of voltage and frequency, including reducing the fluctuation from renewable firming, to support the renewable energy power plants according to the Alternative Energy Development Plan (AEDP2015), and to reduce power loss in the system (System Loss Saving). ESCL is a pilot project to study, evaluate, and collect information to be applied in other areas. As of December 2020, the progress of the project was 42.291%. It is scheduled to be completed in 2021.

19. Transmission System Development Project for the Power Plant of Hin Kong Power Holding Co., Ltd. (THKP)

         The objective of this project is to enhance security of the electricity system in the Western and Southern parts of the country. The Energy Policy Committee approved, on May 3, 2019, the proposal of RATCH Group Public Co., Ltd. to construct the 700 MW Former Western Power Plant which will be in commercial operation on March 1, 2024 and a new power plant with the capacity of 700 MW which will be in commercial operation on January 1, 2025 to make the total capacity of 1,400 MW. RATCH Group Public Co., Ltd. will be responsible for the investment in the improvement of natural gas pipelines and transmission lines which will be completed in 2023.

20. Transmission System Development Project for Power Purchase from SPP Firm Cogeneration Power Plants of which the Power Purchase Agreement Expires in 2019-2025 (TSFC)

          The project is prepared as assigned by the regulator to accommodate the power purchase from the SPP Firm Cogeneration Power Plants to maintain security and stability of EGAT’s power system concerning the operation of the equipment of control and prevention system. The project is expected to be completed in 2025.

Transmission System Projects under Approval Process

1. Transmission System Renovation Project for Linking HVDC with Khlong Ngae Substation (RHDC)

          The government has a policy to promote Thailand as a hub for energy trading of the region. At present, the transmission lines between Thailand and Malaysia is High Voltage Direct Current (HVDC). The equipment of the 19-year-old HVDC Khlong Ngae Substation, Thai-Malaysia situated in Songkhla Province, had been aged and needs renovation. It is therefore necessary for EGAT to improve the transmission system to be stable and reliable. The aim of the project is to extend the service life of the equipment to the minimum of 10 years. The project is expected to be completed in 2023.

2. Transmission System Development Project for Linking Floating Solar with Hydropower Plant of Ubol Ratana Dam (URS1)

         The objectives of the project are to promote the use of renewable energy of the local electricity generation sector to the fullest potential, to reduce the import of energy, and to keep the overall generating capacity of renewable power plants to comply with the PDP2018. The 24 MW Hydro-Floating Solar Hybrid of Ubol Ratana Dam is planned to be in commercial operation by 2023.

3. Transmission System Development Project for Special Economic Zone Project, Phase 1 (SEZ1)

          EGAT plans to construct/improve additional 230 kV and 115 kV transmission lines and substations in Tak and Mukdahan Provinces to supply more electricity to the economic zone, to enhance the system security in the long run, and to support the government policy in promoting electricity generation from renewable energy in the Special Economic Zone which is not supported by other transmission system development plans. The project is expected to be completed in 2024.

4. Transmission System Development Project for Mae Moh Power Plant Replacement Project, Units 8-9 (MMR2)

          The project involves the transmission system to support the Mae Moh Power Plant Replacement Project, Units 8-9, which is a new power plant according to the PDP2018 Revision 1 to replace the existing Mae Moh Power Plant, Units 8-9, which will be decommissioned in 2022 and 2025 respectively. The power plant has the generating capacity of 600 MW using lignite from Mae Moh Mine as fuel. The objectives of the project are to support the electricity demand of the country, to maintain security of the power system, and to respond to the government policy in maximizing the benefit of local fuel. The project is expected to be in commercial operation in 2026.

5. Transmission System Development Project for Nam Phong Power Plant Replacement Project (NPR1)

         The objective is to support Nam Phong Power Plant Replacement Project according to the PDP2018 Revision 1 to replace the existing Nam Phong Power Plant, Blocks 1-2 which will be decommissioned in 2025. The project will enhance security of the power system in the Northeastern part of the country. The power plant has the generating capacity of 650 MW using natural gas as primary fuel and diesel oil as supplementary fuel. It is planned to operate commercially in 2025.

6. Transmission System Development Project for Nam Phong Power Plant Replacement Project (NPR1)

          The project involves the construction of the 2 circuits of submarine cable of 230 kV from Khanom Substation to Samui Island Substation (new substation) with the distance of approximately 52.5 km on a new electricity network. The project aims to increase the capability of supplying electricity to the southern archipelago in Samui District, Surat Thani Province and the nearby islands in response to the rising demand for electricity and to enhance system security in the long run. The project is planned to be completed in 2026.

7. High-Voltage Substation Improvement Project in the 3 Southern Border Provinces (HSIT)

          The objectives of the project are to enhance the security of the power system and to reduce the risk of damage to equipment of the substations in the 3 Southern Border Provinces. The project involves the construction, expansion, and improvement of Yala 1 Substation, Pattani Substation, and Su-ngai Kolok Substation which are air-insulated substations (AIS) to be gas-insulated substations (GIS). The project is planned to be completed in 2026.

8. Transmission System Development Project for South Bangkok Power Plant (Addition) (SBA1)

         The project involves the transmission system to link the South Bangkok Substation and South Bangkok Power Plant (Addition) which is a new power plant to replace the South Bangkok Combined Cycle Power Plant, Blocks 1-3 and North Bangkok Power Plant, Blocks 1-2 which will be gradually decommissioned in 2020-2036. South Bangkok Power Plant (Addition) with a generating capacity of 2,100 MW will maintain security of the power system in the Metropolitan area using natural gas as primary fuel. The first block is planned to be in commercial operation in 2026, the second and third blocks in 2027.

9. Transmission System Development Project for Surat Thani Power Plant, Blocks 1-2 (SRC1)

          The objective of the project is to support the power supply of Surat Thani Power Plant, Blocks 1-2. The project will increase the capacity of electricity generation, enhance the security of the electricity system in the South, and reduce dependency on electricity from the Central part and import from Malaysia. The project is planned to be in commercial operation in 2027 and 2029 respectively.

10. Transmission System Development Project for North Bangkok Power Plant (Addition), Phase 1 (NBA1)

          The project will support the power supply of North Bangkok Power Plant (Addition) which has a generating capacity of 700 MW using natural gas as fuel and is planned to be in commercial operation in 2028. The objectives of the project are to enhance the security of the electricity system and to cope with the increasing demand for electricity in the metropolitan area which has a tendency to rise an average of 1.9 percent per year.

11. Transmission System Development Project for Special Economic Zone Project, Phase 2 (SEZ2)

         The Special Economic Zone Project is established by the government consisting of 2 phases, namely phase 1 covering Tak, Sa Kaeo, Songkhla, Trat, Mukdahan, and Nong Khai Provinces and phase 2 including Narathiwat, Chiang Rai, Nakhon Phanom, and Kanchanaburi Provinces. To support the project, EGAT proposed the Transmission System Development Project for Special Economic Zone, Phase 2 which involves the construction of additional transmission lines in the Special Economic Zone in Chiang Rai Province to increase the capability of power supply to meet the growing demand. The project will respond to the policy on electricity generation from renewable energy, enhance the long-term system security of Chiang Rai Province, and support the grid interconnection with neighboring countries in the future. The project is also in line with the government policy for the development of Special Economic Zone and PDP2018 Revision 1. The project is expected to be complete in 2029.

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EGAT Magazine 2018 - Oct-Dec