Australia’s desalination sector has moved from being a politically contested “last resort” to a mainstream part of urban water security. The industry was born out of the Millennium Drought, but its role has broadened: desal is now used not only for drought response, but also for resilience against poor raw-water quality during floods and bushfires, and as a way to underpin growth in cities and water-stressed regions. In Perth, desalination already provides roughly half of drinking water supply; in Melbourne, the Victorian Government has just ordered 150 GL from the Victorian Desalination Plant for 2026–27 after storages fell; and in South East Queensland and regional WA and SA, new desal projects are advancing from planning into delivery. (Water Corporation)
What follows is a practical snapshot of the sector: the main operating assets, the next wave of projects, how the industry evolved, and where the pressures and opportunities now lie.
Operating desalination facilities
| Facility | Location | Capacity | Started / commissioned | Owner / operator | Cost (if available) |
|---|---|---|---|---|---|
| Perth Seawater Desalination Plant | Kwinana, WA | 50 GL/yr | 2006 | Water Corporation | ~A$387m |
| Southern Seawater Desalination Plant | Binningup, WA | 100 GL/yr | 2011 (Stage 1); 2014 full 100 GL | Water Corporation | n/a in source set |
| Sydney Desalination Plant | Kurnell, NSW | 91.25 GL/yr | 2010 | Utilities Trust of Australia, managed by Morrison | ~A$1.24bn |
| Gold Coast Desalination Plant | Tugun, Qld | ~43–45.6 GL/yr | 2009 | Seqwater | ~A$1.209bn |
| Adelaide Desalination Plant | Lonsdale, SA | 100 GL/yr | 2011–12 | SA Water | ~A$1.84bn |
| Victorian Desalination Plant | Wonthaggi, Vic | 150 GL/yr | 2012 | State of Victoria / AquaSure PPP | A$3.5bn |
| Penneshaw desalination plants | Kangaroo Island, SA | 0.4 ML/day + 2 ML/day | 1999; late 2024 | SA Water | n/a |
Compiled from official utility and government sources. Perth Kwinana capacity/start/cost come from Water Corporation and WA budget papers; Binningup capacity and commissioning from Water Corporation; Sydney capacity/ownership from Sydney Desalination Plant and cost from official financial statements tabled in NSW Parliament; Gold Coast capacity and 2009 start from Seqwater, with capital cost from Queensland budget/parliamentary material; Adelaide capacity/start from SA Water and EPA SA, with project cost from SA Ombudsman/agency material; Victoria capacity, commissioning and cost from Victorian Government sources; Penneshaw details from SA Water. (Water Corporation)
Future and expanding projects
| Project | Location | Capacity | Status / timing | Owner / operator | Cost (if available) |
|---|---|---|---|---|---|
| Alkimos Seawater Desalination Plant Stage 1 | Alkimos, WA | 50 GL/yr | Under construction; first water planned 2028 | Water Corporation | A$2.8bn |
| Alkimos Stage 2 | Alkimos, WA | +50 GL/yr (100 GL total) | Future expansion pathway | Water Corporation | included in future expansion planning |
| Eyre Peninsula Desalination Project | Billy Lights Point, SA | 5.3 GL/yr | Under delivery; first water expected by end-2026 | SA Water | ~A$470m |
| Onslow Seawater Desalination Plant | Onslow, WA | 1.5 ML/day initially (upgradeable to 2 ML/day) | Under construction; production scheduled 2026 | Water Corporation | A$94m program |
| Dampier Seawater Desalination Plant Stage 1 + 2 | Pilbara, WA | 8 GL/yr total | Stage 1 due to begin supplying later in 2026; Stage 2 expected 2027 | Rio Tinto / Water Corporation partnership | A$606m Stage 2 investment; plant referenced as A$1.1bn |
| Lower Great Southern proposed plant | Nanarup/Albany region, WA | 3 GL/yr initial | Planning and community consultation; new source needed by 2030 | Water Corporation | not yet stated |
| Gold Coast Desalination Plant expansion | Tugun, Qld | capacity increase not yet published in source used | Business case and investigations underway; Seqwater planning for delivery by 2030/31 | Seqwater | A$30.5m planning/investigatory funding announced in 2024–25 |
| New SEQ desalination plant (longer-term) | SEQ, likely northern corridor per program documents | not yet stated | Detailed business case being explored | Seqwater | not yet stated |
These project details come from recent official announcements and program documents from Water Corporation, SA Water/SA Government, Seqwater, Rio Tinto and WA Government. (Western Australian Government)
How the sector evolved
The first big wave of Australian desalination investment was a direct response to the Millennium Drought. Perth moved first, bringing the Kwinana plant online in 2006, then the larger Binningup plant in stages from 2011. Queensland brought Tugun online in 2009. Sydney’s Kurnell plant followed in 2010, Adelaide’s Lonsdale plant in 2011–12, and Victoria’s Wonthaggi plant was fully commissioned in December 2012. (Water Corporation)
That first wave was shaped by urgency, large capital spending, and political controversy. Several projects were criticised for cost and periods of low utilisation after wetter years returned. But the strategic logic has strengthened over time. Climate change has reduced the reliability of traditional rainfall-fed systems, especially in WA. At the same time, large east-coast systems have learned that climate risk is not only about drought: floods, bushfires and raw-water quality disruptions can also reduce conventional treatment output, which is why utilities in Sydney and SEQ now emphasise desal’s role in operational resilience as well as drought response. (Water Corporation)
The current asset base
The national picture is uneven. Perth is the most mature desal market: Water Corporation says its Kwinana and Binningup plants together have the capacity to supply around half of local water needs, and recent WA material says desal now supplies roughly half of Perth’s drinking water. That makes WA the clearest example of desal shifting from contingency asset to base-load water infrastructure. (Water Corporation)
On the east coast, the big plants are more varied in how they are used. Sydney’s plant can now operate on a “flexible full-time basis” between about 20 GL and 91.25 GL a year, reflecting a more integrated role in the water system. SEQ keeps the Gold Coast plant in hot standby when not fully needed, but has also used it for flood resilience and to support maintenance elsewhere in the grid. Melbourne has gone from years of low or zero orders to a more active ordering pattern since 2016–17, and the latest 2026–27 order shows the plant is again being used as a material supply source rather than a purely symbolic backup. Adelaide’s plant remains the city’s only climate-independent source of drinking water. (Sydney Desalination Plant)
Victoria’s 2026–27 desal order matters
The most important current signal in the sector is Victoria’s latest order. On 7 April 2026, the Victorian Government confirmed a 150 GL desalinated water order for 2026–27. Melbourne Water said the order reflects hot and dry weather, lower rainfall, declining inflows and population growth; end-of-March 2026 storages were 67.1%, down from 78.6% a year earlier, the lowest end-of-summer level since 2020. The order follows a 50 GL order for 2025–26 and reinforces the view that the Wonthaggi asset is now an active part of water-supply balancing, not just a dormant insurance policy. (Melbourne Water)
The next phase of growth
The next build cycle looks more targeted than the first one. The standout project is Alkimos in WA, where Stage 1 will add 50 GL/yr and Stage 2 takes the site to 100 GL/yr. This is not just incremental capacity: it is a sign that Perth expects desal to remain a structural pillar of supply as rainfall declines. (Western Australian Government)
A second theme is the rise of regional desalination. SA’s Eyre Peninsula project, WA’s Onslow plant, the Dampier expansion in the Pilbara, and the proposed Lower Great Southern plant near Albany all show desal moving beyond capital-city drought planning into regional growth, mining-linked demand, groundwater substitution, and climate adaptation for smaller systems. (Housing and Urban Development)
Queensland is the other system to watch. Seqwater is progressing a business case to expand the Gold Coast Desalination Plant, and its program documents point to delivery of the expansion by 2030/31, alongside a longer-term major new water source. (Seqwater)
The industry’s main challenges
The first challenge remains cost and affordability. Desal plants are capital-intensive, and even when not heavily used they still carry fixed costs, maintenance requirements and energy exposure. That is one reason desal has often been politically contentious. (Water and catchments)
The second is energy. Reverse osmosis is proven and increasingly efficient, but it is still power-hungry relative to conventional surface water. Australian utilities are responding by pairing desal with renewable procurement and lower-emissions operating strategies, but the energy-water nexus remains central to project economics and public acceptance. (Western Australian Government)
The third is environmental and community acceptance. Intake and outfall design, brine dispersion, coastal amenity, marine ecology, construction impacts and visual footprint all matter. That is why newer projects such as Alkimos and Nanarup are being framed around lower-impact design, consultation and site selection. (Water Corporation)
A fourth challenge is integration with broader water portfolios. Desal is most valuable when it is part of a larger system that also includes dams, transfers, demand management, recycling and groundwater replenishment. Australia’s current planning increasingly treats desal as one element in a portfolio rather than a stand-alone answer. (Seqwater)
Outlook
The outlook for Australia’s desalination industry is strong. The country already has a mature base of large coastal assets, proven operating capability, and utilities that increasingly understand how to use desal flexibly. The next decade is likely to feature three trends: more base-load use in systems under chronic rainfall stress, especially WA; more targeted regional plants in exposed coastal communities and industrial corridors; and more portfolio integration with recycled water, groundwater replenishment and network planning. (Water Corporation)
The key commercial point is that desal is no longer just an emergency measure. In Australia, it is becoming a normal infrastructure class: expensive, energy-sensitive and politically visible, but increasingly indispensable.
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