Australia's $2.8 Billion Alkimos Seawater Desalination Plant Project: Main Trunk Pipeline Construction Passes Halfway Mark
2026-06-16 14:16
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en.Wedoany.com Reported - Key progress has been made on the Alkimos Seawater Desalination Plant project in Western Australia, with construction of the underground main trunk pipeline connecting the plant to the water supply network now more than half complete.

$2.8 billion seawater desalination project reaches milestone

Over 17 kilometers of the 33.5-kilometer underground main trunk pipeline have been completed. This pipeline will connect the future Alkimos Seawater Desalination Plant to the Water Corporation's Wanneroo Reservoir, aiming to enhance water security for the state's growing population.

With an internal diameter of 1.6 meters, the pipeline is one of the largest ever built in Western Australia and has been designed to accommodate future expansion of the desalination plant.

The pipeline is manufactured by local company Steel Mains in Kwinana, using steel-lined cement pipes made from Pilbara iron ore and Cockburn cement. To date, nearly 1,600 pipe segments have been installed, with individual lengths ranging from 6 to 12 meters.

This main trunk pipeline is a key component of the $2.8 billion Alkimos Seawater Desalination Plant project. Once operational, the plant is expected to become Western Australia's next major water source, initially supplying 50 billion liters of drinking water per year and supporting over 1,500 jobs.

The pipeline will connect the desalination plant to the integrated water supply system via the Carabooda Basin, the future Neerabup Basin, and the Wanneroo Reservoir, serving a population of over 2.5 million.

Its large diameter design enhances efficiency, with expected reductions in pumping energy consumption and greenhouse gas emissions of 21% compared to smaller pipeline designs.

The main trunk pipeline is being delivered by the Alkimos Trunk Alliance, comprising the Water Corporation, Georgiou Group, and DM Civil, with the project expected to be completed in 2027.

Western Australian Premier Roger Cook stated that the project demonstrates the benefits of local manufacturing and infrastructure investment. Water Resources Minister Don Punch noted that this milestone marks a significant step in securing the state's long-term water supply.

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