Overview
The Perth Seawater Desalination Plant is a large-scale reverse osmosis facility in Western Australia, supplying drinking water to the Perth metropolitan area since 2006.
The Perth Seawater Desalination Plant is a major reverse osmosis (RO) desalination facility located in the suburb of Kwinana, south of Perth, Western Australia. It is one of the largest desalination plants in Australia, with a capacity of approximately 140 million liters per day, providing a climate-independent water source for the region. The plant uses reverse osmosis technology to treat seawater from Cockburn Sound. It is powered by renewable energy from the Emu Downs Wind Farm, making it one of the first large-scale desalination plants in the world to be fully offset by renewable energy. The plant operates under strict environmental regulations set by the Western Australian government, including brine discharge management to protect the marine ecosystem. Operational since 2006, the plant plays a critical role in Perth's water security, especially during dry periods. It is owned by the Water Corporation of Western Australia and has been recognized for its sustainable design. The facility's integration with renewable energy sets a benchmark for low-carbon desalination globally.
Environmental context
The plant discharges brine into Cockburn Sound, a sensitive marine environment that supports seagrass meadows and diverse marine life. To mitigate impact, the brine is diluted through a multi-port diffuser system. The use of wind energy reduces greenhouse gas emissions associated with desalination, aligning with Australia's renewable energy targets.
Frequently asked questions
The plant is located in Kwinana, south of Perth, Western Australia, on the coast of Cockburn Sound.
The plant has a capacity of approximately 140 million liters per day, supplying up to 17% of Perth's drinking water.
The plant is powered by renewable energy from the Emu Downs Wind Farm, making it one of the first large-scale desalination plants to be fully offset by wind power.
Desalination plants in Australia are regulated by state environmental protection agencies, with brine discharge managed under the National Water Quality Management Strategy and state-specific guidelines.
The plant uses reverse osmosis (RO) technology, where seawater is forced through semi-permeable membranes to remove salts and impurities.