Power generation at Yallourn was first proposed in 1919 when the Victorian Government appointed a committee to investigate the use of coal from the Latrobe Valley. The plant was operated by the State Electricity Commission of Victoria, and the first sod was turned at the Yallourn Power Station site in 1921. Along with the power station, the town of Yallourn was constructed nearby to house workers of the plant. Coal was moved from the open cut mine to the power station by the Yallourn 900mm Railway, a narrow gauge electric railway running along temporary tracks in the mine. The Morwell Interconnecting Railway was later provided to the Morwell power station and briquette works for the transfer of Yallourn coal to the briquette works, as Morwell mine coal did not briquette satisfactorily. In the complex, Yallourn A was the first plant opened in 1928. "A" station consisted of 6 Metro Vickers sets each 12.5MW. Steam was supplied by 12 John Thompson chain grate boilers each producing 80,000 lb/hr at 260PSI and 640degF. Yallourn B entering service on 11 April 1932. B station consisted of 4 Metro Vickers sets of 25MW. Steam was supplied by 10 John Thompson chain grate boilers each producing 120,000 lb/hr at 260PSI and 670degF. Yallourn A was demolished in 1968, and Yallourn B following in the early 1970s. Yallourn C, D and E stations were commissioned in 1954, 1957 and 1961 respectively, and provided the bulk of Victoria's power until Hazelwood Power Station became operational in the mid 1960s. Yallourn A, B, C & D were constructed as 'range'-type power stations that connected individual boilers to a common steam range before connecting to the turbine. C station had 2 turbo alternators, each. Steam was supplied by 6 pulverized coal burning water tube boilers. Each boiler produced 200,000lbs/hour at 645psi and 825degF. D station was exactly the same as C station. E station had 2 units, each with hydrogen cooled generators but no stator water cooling. Steam came from 2 PF boilers, each producing 950,000lbs/hour at 1600psi and 1050degF. Yallourn E was the first unitised station constructed in the complex, as each boiler was paired with its own turbine. Yallourn E station ceased generating power in January 1989, with C, D and E plants being demolished from 1995 onwards, with the site being cleared by 1999. The narrow gauge railway in the mine was replaced by conveyor belts in 1984, and the Morwell Interconnecting Railway was replaced by road haulage in 1993.
Briquette factory
In conjunction with the power station, the open cut mine also fed a briquette factory operated by the SECV. The first stage of the factory came into operation in November 1924 with a capacity of about per day, with a major extension approved in 1927 and completed early in 1931 increasing the capacity to per day. Using German technology, the factory also generated electricity, with a maximum output of approximately it produced daily, of which about was used in the factory and was fed into the state grid. The plant closed in 1970, after the discovery and reticulation of natural gas in Victoria which led to the closure of the major Lurgi briquette gasification plant in Morwell. Remaining demand for briquettes was met by the Morwell briquette factory that was opened in 1959. It was shut down in 2014.
Yallourn W
The current Yallourn W power station was built in the 1970s at Yallourn West. The four units are Toshiba built 3 stage reheat turbines with steam supplied by four 'subcritical' pulverized coal-fired boilers. In 1969 it was announced that the town of Yallourn would be demolished to enable an expansion of the coal mine, with demolition commenced in the 1970s and completed by 1982. Yallourn W power station was the second Victorian generating entity to be privatised in 1996 when it was sold to a consortium including PowerGen, Itochu, AMP, Hastings and NSW State Super. The plant is currently owned by Hong Kong-based CLP and operates under the EnergyAustralia brand. With the coal supply from Yallourn's East Field mine expected to be exhausted in 2007, work commenced on a diversion of the nearby Morwell River in 2002 to enable access to further coal sources from the Maryvale coal field. Without this, the power station potentially faced significant modification or even closure. The Morwell River Diversion, and the access to coal supplies it allows, will ensure Yallourn can continue to operate until 2032. The diversion was constructed over five years at a cost of 122 million, and came in on time and on budget. On 6 June 2012, a levee bank failure resulted in the flooding of the Yallourn coal mine causing damage to its infrastructure and cutting fuel supply to the power station. In 2007 the station's name was shortened to be "Yallourn Power Station". In late 2007, a subsidence in the mine wall resulted in the Latrobe River bursting through, damaging coal conveying plant and flooding low levels of the mine. Urgent earthwork repairs were made with the co-operation of other power generators. Coal production was limited for some weeks. Carbon Monitoring for Action estimates this power station emits of greenhouse gases each year as a result of burning coal. The Australian Government announced the introduction of a Carbon Pollution Reduction Scheme commencing in 2010 to help combat climate change. It is expected to impact on emissions from power stations. The National Pollutant Inventory provides details of other pollutant emissions, but not CO2.
Fire
On 21 June 2013 a fire broke out in a control panel causing three units to trip. This multi-unit contingency caused a "Pricing Event" on the National Electricity Market, and the Market Operator reported the event as part of an industrial action campaign. Police later announced their finding that the event was an act of sabotage.
