US aluminium giant Alcoa says there is no "sustainable" path to restarting its Kwinana refinery in Western Australia after winding down production at the facility.

Alcoa started phasing out its workforce at the Kwinana Alumina Refinery in January 2024, which one economic expert estimated would cut roughly $650 million from the state's economy per year.

In a statement, Alcoa's chief operations officer Matt Reed said the company had assessed the "future of the refinery, including restart and closure" since the curtailment.

"Alcoa operated the Kwinana refinery for a number of years in a challenging environment and made the difficult decision to permanently close the facility after unsuccessfully exploring multiple options for a sustainable path to restarting," he said.

"We appreciate the

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