March 15 (Reuters) - The Australian unit of U.S. aluminium producer Alcoa Corp AA.N said on Wednesday the output at its Portland smelter in Victoria would be reduced to about 75% of its total capacity of 358,000 metric tonnes per year, citing instability and production challenges.
Australia's Alumina Ltd (AWC) owns a 40% stake in Alcoa Australia, which holds a 55% stake in the Portland Aluminium joint venture.
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