Entry on Lower Powlett Rd
|Estimated output||410 megalitres (14×106 cu ft) per day|
|Extended output||550 megalitres (19×106 cu ft) per day|
|Cost||A$5.7 billion (max) contracted to 2039|
|Energy generation offset||Windfarm at Glenthompson (proposed)|
|Technology||Reverse Osmosis (proposed)|
|Percent of water supply||Estimated 33% of Melbourne|
|Operation date||December 2012|
The Victorian Desalination Plant (also referred to as the Victorian Desalination Project or Wonthaggi desalination plant) is a water desalination plant in Dalyston, on the Bass Coast in southern Victoria, Australia.
The desalination plant is the largest addition to Melbourne's water system since the Thomson River Dam was completed in 1983.
It was announced by Premier Steve Bracks in 2007 when Melbourne's water storages were at their equal lowest-ever level being 28.7 percent of capacity.
Increased Winter-Spring rains after mid 2007 took water storages above 40%., but it was not until 2011 that storages returned to pre-2006 levels.
When the facility was completed in December 2012 Melbourne's reservoirs were then at 81%. The plant was immediately put into standby mode.
The first water released for public use was in March 2017 via Cardinia Reservoir.
As a rainfall-independent source of water the desalination plant complements Victoria's existing drainage basins, being a useful resource in times of drought. It is a controversial part of Victoria's water system, with ongoing costs of $608 million a year.
The potential for a desalination plant was promoted through the late 2000s in response to an increasingly severe drought which saw Melbourne's water storages go from 57.1 per cent of capacity in January 2005 to 28.7 per cent in June 2007.
The project was part of the Victorian Government's "Our Water, Our Future" water plan which included associated projects such as the North-South Pipeline, the Cardinia Pipeline and a proposed interconnector to Geelong. The total average inflow into Melbourne dams from 1913 to 1996 was 615 gigalitres (2.17×1010 cu ft) per year, while average inflow 1997–2009, during Victoria's most severe recorded drought was 376 gigalitres (1.33×1010 cu ft) per year.
The combination of drought and rapid population growth put pressure on reserve storage capacity which had dropped from 97.8 per cent in 1983 to just over one-quarter of maximum capacity in 2007. As a result, water restrictions were in place for several years.
The desalination plant and associated infrastructure includes tunnels connecting the plant to marine intake and discharge structures up to 1.2 km (1⁄2 mi) out to sea, an 85-kilometre (55 mi) pipeline to connect the plant to Melbourne's water supply system, and power supply infrastructure for the plant.
The plant can provide up to 150 gigalitres (5.3×109 cu ft) of additional water a year, with the potential to expand production to 200 gigalitres (7.1×109 cu ft) per year.
A two-headed marine structure extends up to 2 km (1 mi) offshore was to be temporarily constructed. The plant takes in 480 billion litres (1.1×1011 imp gal; 1.3×1011 US gal) of seawater and pumps back 280 billion litres (6.2×1010 imp gal; 7.4×1010 US gal) of saline concentration every year.
Estimated water production is 150 gigalitres (5.3×109 cu ft) of desalinated water per year, potentially providing around a third of Melbourne's annual water consumption (based on 2007 consumption levels). It is intended that the water produced will be supplied to Melbourne, Geelong, Western Port and South Gippsland.
The intake pipes for the desalination plant are located over 1 kilometre (1⁄2 mi) out to sea.
In August 2008, a 1,600-page environmental effects study report was prepared and found that; "...several protected species could be affected by the plant's construction and operation – including the orange-bellied parrot, the growling grass frog and the giant Gippsland earthworm – but none would be left "significantly" worse off.". The community was given 30 business days to respond to the report. Watershed Victoria claimed that this was insufficient time for community groups to analyse the report and prepare submissions.
There were eight tenderers for the contract.  Two consortia were short-listed for the construction and operation of the plant – AquaSure (Thiess/Suez) and BassWater (John Holland Group/Veolia Environmental).
On 30 June 2009, the consortium AquaSure, which is made up of Degremont, Macquarie Capital and Thiess, was named the winning bidder. Simultaneously, it was announced that construction was scheduled to commence in late 2009, proposing that water be delivered by late 2011.
A $1.8 million per day fee is payable to the construction consortium. This minimum fee is payable for 27 years after completion. Even if no water is required, the total payment is between $18 and $19 billion.
Nine sites were included in the feasibility study's "long list", and subsequently reduce to four (Surf Coast, East of Port Philip Bay, West of Western Port, and Bass Coast). The Bass Coast was chosen as the premium location. Compulsory acquisition notices were issued to affected residents on 25 January 2008.
The site is located on Bunurong aboriginal land, specifically the Boakoolawal clan which lived in the area south of the Bass River before white settlement. Middens containing charcoal and shellfish mark the location of their campsites along the coast. Many significant archaeological artifacts have previously been discovered around the construction site, including Australia’s first dinosaur bone, the Cape Paterson Claw, discovered nearby in 1903 by William Ferguson near what is now Eagles Nest, Bunurong Marine National Park in Inverloch.
The capital cost for the project was initially estimated to be $2.9 billion in the initial feasibility study; this was later revised to $3.1 billion and then to $3.5 billion. After the winning bidder was announced it was revised to $4 billion.
Operating costs are to be charged by a private firm over a 25–30 year period and are estimated to be around $1.5 billion. This cost includes labour, replacement of membranes, chemicals costs and energy, and it was initially estimated at $132 million per annum. Unlike previous water infrastructure works in Melbourne, the plant will be built and operated as a public-private partnership.
A 2008 report by the Water Services Association of Australia, modelling several national water-supply scenarios for 2030. It determined that sourcing water supply by seawater desalination was the most energy-intensive. The report predicted that if desalination was the primary source of supplying around 300 litres (66 imp gal; 79 US gal) per person per day, energy use would rise by 400% above today's levels.
On 12 December 2009 The Age newspaper published details of considerable areas of land made cheaply available to the plant's developers without the value of that land being included in the project's official costs.
The average water bill for residents living in Melbourne was estimated to rise by more than 60 per cent over the following five years, while the Essential Services Commission estimated it might rise up to 96 per cent.
Then Water Minister Tim Holding, stated that; "Melbourne residents need to help pay for major water infrastructure projects, such as the desalination plant and the Sugarloaf (North South) pipeline."
By comparison, the Kwinana Desalination Plant in Perth, Western Australia, was completed in 2006 with approximately 30–50 per cent of the output of the Wonthaggi plant. It cost $387 million to build and did not include an 85 km (55 mi) pipeline and windfarm.
The plant is estimated to require 90 MW of electricity to operate. Additional energy will be required to pump the desalinated water from Wonthaggi to Cardinia Reservoir in Melbourne.
The Victorian Government claimed that 4,745 full-time equivalent jobs would be generated by the project over the two-year construction period. Construction work officially began on 6 October 2009. The plant was declared operational in December 2012, approximately one year later than planned.
The project encountered opposition from community groups and local residents, and the Australian Greens and the business fundamentals were challenged during feasibility studies and assessments of Melbourne's water supply needs.
Regular public rallies were conducted on the site and in Melbourne.
The community group Your Water, Your Say was one of the first organised opposition group. It was sent bankrupt after it lost a legal case after the group pursued the Victorian Government over lack of reports and consultation. The case centred on initial water requirement figures, feasibility studies and environmental effects reports among other issues. More recently, a new opposition group Watershed Victoria, has continued the opposition campaign. The government pursued legal costs, which sent the group bankrupt.
At a July 2008 protest several people were removed from Crown land, but none were arrested.
In June 2009, a petition including 3,000 signatories opposing the plant was presented to the Victorian Parliament.
Your Water Your Say (YWYS) opposed the proposal, taking legal action against the Victorian State Government regarding non-disclosure of financial information and lack of environmental studies and reports. As of July 2008 YWYS lost the action, and the Federal Court awarded costs to the State Government estimated to be up to $200,000, effectively rendering the community group broke. YWYS was subsequently disbanded.
In its submission response to the Environmental Effects Statement, YWYS stated: "The Federal and State Governments are aware that YWYS is unlikely to be in a position to pay its significant legal costs and hence their apparent inability to make a decision on this front can only be interpreted as an attempt to further avoid community scrutiny of this project."
In December 2009, it was revealed that private information obtained by Victoria Police during surveillance efforts on individuals involved or corresponding with YWYS, Watershed Victoria and other community groups, had been made available to the private consortium building the desalination plant, Aquasure, via a memorandum between the State Government, Victoria Police and Aquasure. Victoria Police responded by explaining that the information would be used to better "manage" future activities and potential "security threats".
Booked tours are run and plans are underway for Aquasure to open to the public. The gates open daily for public access to the 225-hectare (560-acre) park and 8 kilometres (5 mi) of walking, horse riding and cycling tracks. The plant is located next to Williamsons Beach and the Wonthaggi Wind Farm, Wonthaggi.
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