Thailand Power Development Plan 2015-2036

Koh Samui and its vicinity in the long run. Currently, PEA has operated one 33 kV and
three 115 kV Submarine Cables of which the capacity will be able to cope with the
growing electricity demand in the areas of Koh Samui, Koh Pha-Ngan, and Koh Tao for
only 4-5 years. The project involves the construction of 230 kV submarine cable from
EGAT’s substation to the new 230 kV Koh Samui substation (new EGAT substation). It is
planned to be completed in 2019.
6.2.7 Transmission System Improvement Project in Upper Northern
Region to Enhance System Security, Phase 2
The Transmission System Improvement Project in Upper Northern
Region to Enhance System Security, Phase 2 is the successive project of Transmission
System Improvement Project in Upper Northern Region to Enhance System Security. The
project involves the construction of the 500 kV and 230 kV transmission system lines to
increase the security of transmission system in Phayao and Chiang Rai Provinces to cope
with the growing electricity demand in the long term and to accommodate ASEAN Power
Grid (APG) and power purchase from neighboring countries. It is planned to be completed
during 2024 - 2029.
6.3 Transmission System Expansion and Renovation Project
6.3.1 Transmission System Expansion and Renovation Project, Phase 1:
Substation
The Transmission System Expansion and Renovation Project, Phase 1:
Substation involves the improvement or replacement of aging equipment in substations
which consist of 15 subprojects and miscellaneous system improvement. The project
aims to increase the availability, reliability and security of the transmission system. It was
approved by the cabinet on January 18, 2011 and planned to be completed in 2017.
6.3.2 Transmission System Expansion and Renovation Project, Phase 1:
Transmission Line
The Transmission System Expansion and Renovation Project, Phase 1:
Transmission Line involves the improvement or replacement of aging equipment in
transmission line routes which consist of 15 subprojects and miscellaneous system
improvement. The project aims to reduce the power outage caused by the aging
transmission lines, to increase the continuity and efficiency in power supply and to
enhance the reliability of the power system and the performance index of the
transmission system. It was approved by the cabinet on May 20, 2012 and planned to be
completed in 2019.
6-4