Australia's first new steel mill in three decades will be unlike any that came before it. Run entirely on electricity, the Greensteel Australia factory to be built in the NSW Hunter region will make steel that's low emissions and unencumbered by fossil fuel supply chains. To be built on the site of the old BHP Newcastle Steelworks in Mayfield, the Sydney-based company's $500 million investment marks the return of steel-making to the state's manufacturing heartland.