Tomago Aluminium in NSW may be saved from closure in 2028 by a possible billion dollar bail-out. Photo: Michael Gorton/AAP PHOTOS

The potential billion-dollar bailout of Australia's biggest aluminium smelter looks like "double standards", according to a state Liberal government trying to keep its own facility operational.

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

But federal government figures are desperate to keep the smelter running and

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