Alcoa chief executive Bill Oplinger told Wall Street the US aluminium specialist could take strong action to boost profits from alumina, most of which it refines in Western Australia.
South West WA's power grid reached a record 91 per cent peak renewable energy share in December - driven by 1,225 MW of new battery storage - while wholesale power prices fell 13 per cent and carbon emissions dropped 15 per cent as coal and gas generation declined.
The green light for Black Mountain Energy comes just months after Federal experts said its environmental risk assessment was "limited and disjointed" and reached "largely unsupported" conclusions.
Worsley Alumina is a South32-owned bauxite miner in WA's South West. Bauxite mined near Boddington is transported by conveyor to an alumina refinery near Collie largely powered by coal. The alumina is then railed to Bunbury for export.
WA's industrial greenhouse gas emissions are dominated by four products and a handful of companies, including a few that have managed to keep a low profile in the climate wars.
