Tomago Aluminium says high energy costs has forced the company to consider ending its operations. Photo: Michael Gorton/AAP PHOTOS

More than 1000 jobs are at risk as Australia's biggest aluminium smelter begins talks with employees over its potential closure.

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Tomago Aluminium, which is majority owned by Rio Tinto, said high energy costs had forced the company to consider ending its operations when its current electricity supply contracts expired in 2028.

The consultation process is set to run until November 21, but Tomago Aluminium's chief executive Jerome Dozol said the future was

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