EGAT’s high-voltage transmission system is considered as a necessary component or the artery of electric power that is crosslinked to all directions in Thailand.

         From Candle Lights...Lantern the First Electric Light of Siam

         During the reign of His Majesty King Rama V on September 20, 1884, the first electric light of Siam was officially shone at the Chakri Maha Prasat Throne Hall. Later in 1897, the first Thailand’s private power plant was inaugurated at Wat Liap. In 1914, His Majesty King Rama VI royally granted permission to establish the Samsen Royal Electricity Authority; the initial state enterprise that generated and supplied electricity to Phra Nakhon District. In 1929, electric utilities were firstly launched in upcountry at the sanitation districts of Ratchaburi and Nakhon Pathom provinces. After that, the government of Thailand enacted “the Yanhee Electricity Authority Act” in 1957. On December 14, 1960, “the Lignite Authority Act” was also promulgated to apply in Lampang, Lamphun, Chiang Mai and Tak provinces. Respectively, “the Northeast Electricity Authority Act” was imposed in 1962.

         Electricity Generating Authority of Thailand or EGAT originated from the merger of the Yanhee Electricity Authority, the Lignite Authority and the North-East Electricity Authority on May 1, 1969. Up to the present, it has undertaken the country’s power system for over 48 years.


         The electric power in Thailand has journeyed through decades to the era of a borderless world which is considered as a relevance of the “electric power revolution”. As the modern world is driven by agricultural and industrial hybrid technologies, the electric power becomes primary necessity of life in nowadays. Moreover, the electric power development takes an important role in multidimensional changes including public healthcare, transportation, education, tourism and communication.

         The power system developmental path has been continued with effective mechanisms comprising power generation from various kinds of fuels and linkage via the “transmission system”.

         “EGAT’s high-voltage transmission system” is considered as a necessary component or the “artery of electric power that is cross-linked to all directions in Thailand”. It transmits electricity from the generation system to the distribution systems of Metropolitan Electricity Authority and Provincial Electricity Authority. The electrical voltage is appropriately adjusted before transmitting electricity to users in all sectors.



         From Timber Utility Steel Transmission Towers

         Currently, a total length of EGAT’s high-voltage transmission lines is over 33,300 circuit kilometers. The network encompassing the whole country includes cables for 115, 230 and 500 kV. They could encircle along the borderline of Thailand for almost 4 rounds.

         In addition to these high voltage cables, the transmission system also comprises other components such as steel poles, insulators, transformers, switchyards and substations. The electricity generation in different periods by all power plants is managed through the EGAT’s National Control Center for fulfilling the balance between the power supply and the country’s power demand. Fuels include natural gas, coal, diesel, bunker oil as well as renewable energy such as water, wind and solar power are used for generating electricity. Meanwhile, in compliance with the international standards, the electricity distribution is also efficiently controlled to ensure “no power shortage or outage”.

         The country’s peak demand has been getting higher, while the power consumption in the future will be increasing as well. To strengthen the country’s power security without too much depending on the natural gas, proportions of fuels used for the electricity generation must be set appropriately. As a result, Thailand’s power system will provide sufficient and reliable power supply in the long term.



         The transmission system is a national asset which must be taken care and maintained by all Thais. Sometimes a natural disaster like thunderbolt, animals such as snakes and birds or ignorant, careless and impetuous people can cause problems to the transmission system. Losses can be easily occurred when people intrude the transmission line areas by having houses constructed or trees planted too close to such areas. Flying kites, shooting birds on wires, burning sugarcane farms or weeds, stealing spare parts, climbing the transmission poles, flying sky lanterns and lighting sky rockets too close to the transmission lines are reasons that may induce malfunctions of the high voltage transmission lines and equipment. As a result, they can cause hazards towards lives and assets as well as impact on the entire power security of the country.

         “The electricity system” has to be advanced steadily. EGAT shall keep moving forward with commitment on the power development. We determine to heighten quality, stability and sufficiency of the efficient eco-friendly power in order to sustainably fulfill power demand of the nation.

         Comparing to a human body, the quality is like a “brain”, the power plant is a “heart”, the fuels are “blood” while the transmission system is the “artery of electric power” that transmits happiness to people and enhances quality of life throughout Thailand.

         Did you know?

         A total length of EGAT’s high-voltage transmission lines is over 33,300 circuit kilometers. They could encircle along the borderline of Thailand for almost 4 rounds.