Western Australia had selected Alkimos as the preferred location for the renewably-powered seawater desalination plant, but will undertake environmental approval before a final decision is made.

Proposed on Water Corporation land north-east of Alkimos Beach and subject to environmental approval, the plant will be capable of delivering 100 billion litres of drinking water annually to support the Integrated Water Supply Scheme (IWSS). 

The plant will be delivered in two stages, with the first 50 billion litre stage expected by 2028, and will eventually provide safe, secure drinking water to millions of Western Australians.

The State Government has already allocated $1.4 billion towards a significant down payment on the project.

Water Corporation will also secure up to 400MW of additional renewable wind energy which will enable all three desalination plants, including the existing desalination plants at Kwinana and Binningup, to be powered with renewable energy.

The additional 400MW of renewable energy was included in the Western Australian Government’s estimated $3.8 billion investment in renewable power generation and storage which will support the utility to meet the new Government emission target of 80 per cent below 2020 emission levels by 2030.

Western Australian Premier, Mark McGowan, welcomed the plant and its preferred location.

“Across southern Western Australia, the long-term impact of climate change on traditional water sources is profound,” Mr McGowan said. 

“A new plant will cater for the growing drinking water needs of Perth, Peel, parts of the South-West and Kalgoorlie-Boulder, and support future economic development.”

For Western Australian Water Minister, Dave Kelly, the new renewably-powered desalination will “reduce reliance on precious groundwater to help protect our lakes, wetlands, bushland and parks”.

“Desalination is energy intensive, that’s why it’s significant that Water Corporation has set itself a target of net zero by 2035, which will include having all three desalination plants powered by renewable energy,” Mr Kelly said. 

“New water sources are just one element in a much larger and more complex supply planning process. It’s absolutely vital we all remain as waterwise as possible to help protect WA’s most precious resource.” 

The new plant’s design has been carefully considered to protect the surrounding environment, cultural heritage and meet community expectations. It will be sunken behind large vegetated sand dunes to shield it from view and buffer noise, while a special tunnel boring technique will limit seabed and beach disturbance during construction.

A detailed Environmental Review Document for the Alkimos Seawater Desalination Plant is currently with the Western Australian Environmental Protection Authority for assessment.

The IWSS currently provides drinking water to around 2.5 million Western Australians across Perth, Peel, some parts of the South-West and as far east as Kalgoorlie-Boulder.

In addition to this, Water Corporation is also committing to a new, earlier net zero greenhouse gas target across all operations by 2035. 

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