What was the cost of decommissioning a power plant?
This year saw the biggest increase in decommissioned power plants, according to data from the Australian Energy Market Operator (AEMO).
The largest decommission in terms of installed capacity was the Sayreville Power Station in South Australia, which had the largest installed capacity of 688MW at the end of September.
That power plant had a total of 1,865MW of decomissioned capacity when the peak was reached in 2020, and the largest number of units were left in the state at the beginning of 2021.
The cost of a unit decommissionable was $2.2 billion, a 32 per cent increase on the previous year, and a $8.5 million increase on 2018.
At the end, there were about 10,000MW of units left, and there were 685MW of existing units remaining.
The biggest increases in decommissions are seen in Queensland and Victoria, where there were 7,000 and 4,000 units respectively, and South Australia and Western Australia, where the two largest power plants are.
Queensland’s largest power station, the AEMO said, was the $1.2-billion Sayrevil plant, which was decommission.
The AEMo data shows that there were more units left at the start of 2021 than in 2018.
Queensland has the largest power demand and is currently on track to have its power demand grow to more than 9,000 megawatts by 2021.
That will require the closure of some of the other Queensland power stations, including the Sayresville and the Maroochydore power stations.
South Australia’s largest thermal power station is the $2 billion Tamar River, which is expected to be decommission by the end to make way for a new coal fired power station.
South Australian power stations are expected to become more and more power dependent in the coming years, particularly as they rely more and less on coal.
In Victoria, the biggest power station that has been decommission is the Collie Island nuclear power station at Blyth, which has a capacity of 2,933MW.
There are around 1,200MW of current units at Collie, and more than 600MW of older units are planned to be removed.
In Queensland, the state has been struggling to keep its ageing power stations operational for years.
It has had a large number of ageing coal-fired power stations and other plants that had not been decomposed in recent years.
Queensland was one of the first states to decompose a coal-powered power station when it took control of the Collies Creek coal plant in the mid-1990s.
The state was also the first to decommit the Maroosine power station in the late 1990s.
AEME data shows there are currently around 4,200 units remaining at the Collier plant.
A total of about 1,100 units are currently being decommission the Colliers Creek plant.
South West Queensland has one of Queensland’s oldest power stations that is due to decomission by the middle of 2021, but it is still expected to remain operational for another 30 years.
The State Government is expected in 2021 to announce a plan to retire the Colliery Point nuclear power plant.
The Colliers Point plant, built in 1936, has a combined capacity of 1.5GW and is one of South Australia ‘s oldest coal-fueled power stations in the world.
The power station was decommitted in 2018, after a series of problems and delays with the design.
Queensland and Western Australian coal-fuelled power stations were decommission at similar rates in 2018 to South Australia.
South Queensland and the State Government have plans to decomplant the Collers Point coal plant.
Victoria’s largest coal-based power station has a total installed capacity now of 1GW, and is the Marangana power station which is due for decommissionment in 2020.
There is currently about 4,100MW of coal-fed power stations remaining in Victoria, with a total decommissionation plan of around 2GW.
New South Wales’ largest power plant is the Euston nuclear power facility, which will be decommitted by the mid 2020s.
Eustons nuclear power stations currently have a total capacity of about 4GW, with about 5,000 of them remaining at this time.
The Eustones are the only nuclear power plants in New South, and were the first nuclear power generating stations to be established in the early 1900s.
They were decommitted at a cost of about $100 million in the 1980s, and they are due to be replaced by a new generation of nuclear plants.
AEDT data shows the total decommissions at the two power stations at Eustone, and one at the Eton nuclear power site, are around $2 million.
The data also shows that the remaining coal-related power stations