Siam Electricity Company
Siam Electricity Company was an early Bangkok power and tram operator that established one of Thailand's first urban electricity systems.
Last updated November 4, 2026
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Overview
Siam Electricity Company was the first major power company established in what is now Thailand and one of the foundational utilities of modern Bangkok. Its initial enterprise was created in 1889 by a group of Siamese royals and nobles led by Prince Thongthaem Thavalyawongse. The founders sought a thirty-year monopoly to build and operate the country's first electric power station, with the request approved by King Chulalongkorn. Although the Crown held most of the shares, the company was organized as a private enterprise rather than as a direct government department. The generating station was built at Wat Ratchaburana, commonly called Wat Liap, and became known as the Wat Liap Power Plant. It used steam engines and primarily burned rice husks obtained from nearby mills. In its early years, electricity was distributed only across selected parts of Bangkok, including streets and districts around Tri Phet, Ban Mo, Sanam Chai, Bamrung Mueang, Charoen Krung, Yaowarat and Sampheng. Demand was initially limited: electricity was used principally for street lighting, royal residences, government buildings, and a small number of homes and premises belonging to nobles and foreign residents. The royal government therefore accounted for much of the company's income. The first venture encountered serious operational and financial problems. Unreliable service, high expenses associated with foreign engineering staff, difficulty securing fuel, and cable theft contributed to the company's bankruptcy in 1892, after only a few years of operation. The Siamese government temporarily assumed responsibility for the plant, despite continuing losses. In 1897, it granted an extendable concession to the American businessman L. E. Bennet. Bennet subsequently transferred the rights to a Danish group led by Andreas du Plessis de Richelieu. The Danish investors incorporated a new Copenhagen-based company using the Siam Electricity name and revived the business. Under the management of Aage Westenholz, the concession was extended to 1950 and the network expanded northward toward Dusit Palace and southeastward into Bangkok's Chinese and Western commercial districts, including areas corresponding to present-day Chinatown and Bang Rak. As electricity became more dependable and commercially available, private businesses increasingly adopted it. The company was also closely connected with Bangkok's tram network. It supplied electricity to the city's first electric tram line and acquired that line in 1900. By 1908, it operated approximately half of Bangkok's tram routes. Its municipal role extended beyond electricity and transportation: it also provided street-watering and firefighting services. The business prospered, and its capital increased substantially during its first decade under Danish management. In 1913, it was sold to a Belgian group. The company later operated alongside the government-owned Sam Sen Power Plant, which entered the market in 1914, with the two systems serving different areas of Bangkok. Following Siam's official name change to Thailand in 1939, the company was renamed Thai Electric Corporation Limited. During the Second World War, Allied bombing raids damaged Bangkok's electricity infrastructure. Both the Wat Liap and Sam Sen plants were disabled in April 1945, leaving the city without power. Wat Liap was repaired and returned to service about two months later, continuing until the end of the company's concession. When the concession expired at the end of 1949, its operations were transferred to Bangkok Electric Works, a state enterprise established in 1950. Postwar growth in electricity demand led to further state consolidation. In 1958, Bangkok Electric Works was merged with the Electrical Division of the Public Works Department, which operated the Sam Sen facility, to form the Metropolitan Electricity Authority. Wat Liap ceased operations soon afterward as larger generating stations replaced it. The original power-station building survives as part of the Metropolitan Electricity Authority's Wat Liap District Office. It has been recognized by Thailand's Fine Arts Department as an unregistered ancient monument, and the MEA announced plans in 2020 to restore it for use as a museum. The company itself is defunct, but its former plant and urban infrastructure remain important physical reminders of Bangkok's early electrification and tram era.
History
Siam Electricity Company's history began in 1889, when Prince Thongthaem Thavalyawongse and other Siamese royals and nobles petitioned King Chulalongkorn for authority to establish an electric power station and operate it under a long-term monopoly. The company was privately organized, although the Crown held the majority of its shares. Its generating station was constructed at Wat Ratchaburana, or Wat Liap, and used steam-driven equipment fueled largely by rice husks from nearby mills. The original network was small and designed chiefly for lighting. It served selected Bangkok streets, royal and government premises, and a limited number of residences and businesses. The enterprise struggled with unreliable machinery, dependence on foreign engineers, rising costs, fuel problems, and the theft of electrical cables. It became bankrupt in 1892, after which the government operated the facility while attempting to manage a loss-making service. A new phase began in 1897, when the government granted an extendable concession to L. E. Bennet. The concession rights were transferred in 1898 to a Danish group associated with Andreas du Plessis de Richelieu. The investors incorporated a new Copenhagen company under the Siam Electricity name and rebuilt the business. Aage Westenholz managed the enterprise during this period, when the concession was extended to 1950 and the distribution network expanded toward Dusit Palace and Bangkok's principal Chinese and Western commercial quarters. Electricity became increasingly useful to private commerce, while the company also became a transportation operator. It supplied power for Bangkok's first electric tram line and acquired the line in 1900. By 1908 it operated about half of the city's tram routes. Street-watering and firefighting were additional services, giving the company a role broader than power generation alone. The business grew rapidly and its capital expanded several times over during its first decade under Danish control. In 1913, ownership passed to a Belgian group. The competitive and institutional setting changed in 1914 with the opening of the government-owned Sam Sen Power Plant. Siam Electricity was responsible for a defined portion of Bangkok, including territory south of Bang Lamphu Canal on the eastern side of the city and south of Khlong Bangkok Noi in Thonburi. In 1939, after Siam adopted the name Thailand, the company changed its name to Thai Electric Corporation Limited. World War II caused major disruption. Allied bombing in April 1945 damaged both Bangkok power plants and left the city in darkness. Wat Liap was restored within roughly two months and continued operating until the company's concession ended. The concession expired at the end of 1949, and Bangkok Electric Works assumed the business in 1950. The state subsequently consolidated Bangkok's electricity institutions: in 1958, Bangkok Electric Works was merged with the Public Works Department's Electrical Division, operator of the Sam Sen plant, to create the Metropolitan Electricity Authority. Wat Liap stopped operating soon afterward as larger generating stations superseded it. Its original building remains incorporated into the MEA's Wat Liap District Office and is recognized by the Fine Arts Department as an unregistered ancient monument. In 2020, the MEA announced restoration plans intended to turn the building into a museum. Thus, although Siam Electricity Company no longer exists as an operating business, its plant and former tram and distribution infrastructure represent an important stage in Bangkok's transition from gas and oil lighting to modern electrical urban services.
- 2020
Wat Liap museum restoration proposed
[1]The Metropolitan Electricity Authority announced plans to restore the historic power-station building for museum use.
- 1958
Metropolitan Electricity Authority formed
[1]Bangkok Electric Works was merged with the Public Works Department's Electrical Division to create the Metropolitan Electricity Authority.
- 1950
Operations nationalized
[1]After the concession expired, Bangkok Electric Works assumed the company's operations as a state enterprise.
- 1945
Wat Liap plant restored after bombing
[1]Allied bombing disabled the plant in April, but the facility returned to service after approximately two months.
- 1939
Company renamed Thai Electric Corporation
[1]Following Siam's adoption of the name Thailand, the company changed its name to Thai Electric Corporation Limited.
- 1914
Government power competitor enters Bangkok
[1]The government-owned Sam Sen Power Plant began operating alongside Siam Electricity's system.
- 1913
Ownership transferred to Belgian group
[1]The prosperous company was sold to a Belgian group.
- 1908
Major Bangkok tram operator
[1]The company operated approximately half of Bangkok's tram lines and also provided street-watering and firefighting services.
- 1900
Electric tram line acquired
[1]The company acquired Bangkok's first electric tram line after supplying it with electricity.
- 1898
Danish group revives the company
[1]Bennet transferred the concession rights to a Danish group led by Andreas du Plessis de Richelieu, which incorporated a new company in Copenhagen.
Products and positioning
A pioneering urban utility and transport operator serving Bangkok during the formative period of Thailand's electrification.
Utility service · 1889
Electricity generation and distribution
The company's principal business was generating electricity at the Wat Liap Power Plant and distributing it through an expanding Bangkok network. Early service focused on street lighting, royal and government facilities, and selected private premises. Later expansion brought electricity to commercial districts and helped establish dependable urban power service in Bangkok.
Urban transport · 1893
Electric tram services
Siam Electricity supplied power for Bangkok's first electric tram line and acquired the line in 1900. By 1908 it operated about half of the city's tram routes, making tram transportation a major part of the company's activities alongside electricity distribution.
Municipal service
Street-watering and firefighting services
During its period of urban operation, the company provided street-watering and firefighting services in addition to electricity and trams. These activities reflected the broad municipal-service role then associated with Bangkok's private utility concession.
Brand decisions
1950
Transfer of the electricity concession to a state enterpriseStrategyBackground
The company's concession ended at the close of 1949, after decades of private operation and wartime damage to Bangkok's electricity infrastructure.
Action taken
Operations were transferred to Bangkok Electric Works, which was established as a state enterprise in 1950.
Aftermath
The transfer marked the end of Siam Electricity's operating role and preceded the creation of the Metropolitan Electricity Authority through further institutional consolidation in 1958.
1939
Adoption of the Thai Electric Corporation nameStrategyBackground
Siam changed its official country name to Thailand in 1939.
Action taken
The company changed its name to Thai Electric Corporation Limited.
Aftermath
The renamed company continued operating the Bangkok concession until its expiry after the Second World War.
Sources1 sources
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