Electricity Trust of South Australia

Electricity Trust of South Australia
Company type	Government-owned corporation
Industry	Electricity generation, transmission, distribution, and retail
Founded	1946; 80 years ago
Defunct	1999
Fate	Privatised and split into separate entities
Headquarters	Adelaide, Australia
Products	Electricity

The Electricity Trust of South Australia (ETSA) functioned as the South Australian Government-owned exclusive vertically integrated electricity supplier from 1946 until its privatisation in 1999.

Initial Period (1882–1900)

The idea of electrical street lighting was introduced by Charles Todd, who oversaw telegraph operations, highlighting the necessity for a public electricity supply. Although the South Australian Electric Company was established under an 1882 Act, it never produced electricity due to opposition from the South Australian Gas Company, which provided energy through coal gas.

Formed in March 1895, the South Australian Electric Light and Motive Power Company received authorization to distribute electricity throughout South Australia. Despite municipal councils having the authority to supply power locally, none took action. Starting on 1 January 1899, the company began delivering electricity from its Nile Street generator to the streets of Port Adelaide, albeit with substandard quality.

Around 1900, engineer Frederick William Herbert Wheadon joined this London-controlled company. With his support, ownership transferred to the English Brush Electrical Engineering Company and the Electric Lighting and Traction Company of Australia. In that year, the City of Adelaide engaged this entity to electrify King William Street, facilitating electricity access for private consumers.

Grenfell Street Power Station (1901–1925)

In 1900, a provisional generating station located at Tam O’Shanter Place started supplying power to Adelaide. Engineer Wheadon designed a new coal-powered plant at Grenfell Street and East Terrace, conceived by architect Alfred Wells as a single-level structure. Officially opened on 19 November 1901, it housed boilers, steam turbines, and a direct current generator with a capacity of 400 kilowatts. Electricity reached North Adelaide by 1902, with additional suburbs such as Norwood, Unley, Hindmarsh, and Thebarton connected during the following decade.

On 31 August 1904, ownership passed to the London-based Adelaide Electric Supply Company (AESC). The company expanded its network of substations throughout most suburbs and supported Adelaide’s electric tram system by 1926, utilizing the innovative Stobie pole infrastructure.

In 1912, the original facility was converted into a two-storey building containing offices, a laboratory, testing rooms, and the main switchboard. Two tall brick chimneys stood behind this structure until their removal in 1926.

By 1917, electricity production had increased to 12,000 kilowatts due to growing demand. Recognizing Grenfell Street's technical limitations, AESCo initiated plans for a larger power station at Osborne on the Port River; however, World War I caused delays in construction.

In August 1923, AESC commissioned the Osborne 'A' Power Station near Port Adelaide under an 84-year lease agreement. Two years later, Grenfell Street Power Station ceased operations. The original building remained under company ownership and was leased as a TAFE college before receiving heritage listing in 1984. In 1989 government bodies acquired it to establish the Tandanya National Aboriginal Cultural Institute.

Nearby converter stations operated between 1901 and 1925 and then again from 1923 until 1967. A commemorative "Historic Engineering Plaque" recognizing the site's importance was unveiled in 1995 by Engineers Australia, ETSA, and Adelaide City Council.

World War II and Coal Supply Challenges (1939–1946)

Initially, the boilers at Osborne Power Station relied on black coal sourced from New South Wales, which maintained exclusive control over Adelaide's electricity provision until 1946. During the Second World War, coal availability became severely limited. Seeking a dependable long-term supply, the state government identified sub-bituminous coal from the Telford Cut near Leigh Creek as the most practical alternative despite its inferior grade. The presence of substantial deposits and the potential for open-cut mining led to exploratory drilling in 1941, with mining operations commencing in 1943 under Premier Tom Playford’s administration.

Formation of ETSA

In 1946, the Adelaide Electric Supply Company (AESC) declined to transition to Leigh Creek coal, even investing in boilers specifically designed for black coal combustion. In response, Premier Playford secured federal funding from Prime Minister Ben Chifley to nationalise AESC, resulting in the establishment of the Electricity Trust of South Australia (ETSA) in September 1946. Following this, F.W.H. Wheadon, AESC’s chief engineer with 48 years of service, retired.

The move to nationalise AESC caused divisions within the Liberal and Country League (LCL), with legislation only passing through support from the Australian Labor Party (ALP) and independent members.

Construction of Osborne 'B' Power Station began in 1947 and concluded shortly thereafter, featuring boilers adapted to burn Leigh Creek coal. Control over the Leigh Creek coalfield was transferred to ETSA in 1948, making it their primary coal supplier.

ETSA expanded its generation portfolio by developing major power stations near Port Augusta: Playford A (1954), Playford B (1963), and Northern Power Station (1985), alongside facilities on Torrens Island. Combined, Playford A and B had a significant generating capacity. Northern Power Station operated using Leigh Creek coal. Efficient mining machinery at Leigh Creek and refurbishment of the railway line between Leigh Creek and Port Augusta by Commonwealth Railways enabled cost-effective coal transportation. From 2001 onwards, Pacific National managed coal freight services.

Privatisation

Following the collapse of the State Bank of South Australia in the early 1990s, the state incurred substantial debt after providing financial support to the bank. Prior to the 1997 state election, the incumbent Liberal government under John Olsen promised not to privatise ETSA. However, after winning re-election and facing fiscal constraints alongside integration into the National Electricity Market, the government advanced plans for privatisation.

Post-election, Olsen’s administration required backing from two non-Liberal members in the upper house to pass legislation; the Australian Democrats held three seats that effectively controlled the balance of power. Former Labor members Terry Cameron and Trevor Crothers allied with independent Nick Xenophon, enabling passage of the ETSA privatisation bill in 1998. Both Cameron and Crothers subsequently left Labor.

The privatisation process dismantled ETSA’s vertically integrated structure into separate generation, transmission, distribution, and retail entities sold to various investors. Although ownership of generation, transmission, and distribution infrastructure remained with the South Australian Government as freehold assets, investors received long-term leasehold rights. A regulatory framework was established to safeguard public interests and ensure operational safety.

The company acquiring distribution operations adopted the name "ETSA Utilities," later rebranded as "SA Power Networks," while other divisions rebranded independently. The retail segment was purchased by AGL, initiating a competitive electricity retail market featuring multiple providers offering tariff competition and combined gas-electricity packages.

While privatisation strengthened South Australia’s financial position through sale revenues, ongoing debate questions its effects on consumers. Rising electricity costs have led to estimates suggesting a net economic loss ranging between $2 billion and $3 billion over a decade for the state.

Contribution to South Australia's post-war development

ETSA was instrumental in advancing South Australia's industrial growth following World War II by supplying dependable, modern electricity to regional communities. Operating as a fully integrated entity managing generation, distribution, and retail of electricity, ETSA pioneered the development of new power sources, including coal extraction at Telford Cut near Leigh Creek.

The organisation extended the electrical grid into areas that were either unserved or had insufficient voltage levels. By the conclusion of the Playford administration, South Australia boasted one of the globe’s most efficient and cost-effective electricity systems, offering consistent low rates from generation hubs such as Torrens Island to distant towns like Mount Gambier.

Following deregulation of the state’s electricity market on 1 January 2003, AGL implemented an average price increase of 23.7%, which triggered sustained political debate. Further price hikes resulted in South Australia recording the highest electricity tariffs worldwide by July 2017. The decommissioning of coal-fired plants accelerated the transition to solar and wind power complemented by large-scale battery storage. This move towards renewables has since reduced generation expenses, fostering more competitive retail electricity prices within South Australia.

Headquarters

For many years, ETSA's main office was situated in Kelvin House at 233 North Terrace. This heritage-listed structure, designed in the Art Deco style by architect Eric McMichael during 1925–26, was later renamed Security House. As of April/May 2023, the entire second floor serves as the premises for the History Trust of South Australia.