BHP Billiton Ltd., the world’s biggest miner, is hot for electric vehicles. The Melbourne-based resources giant, which mines metals and coal used for both steelmaking and fueling power plants, is increasingly optimistic that there’ll be a surge in demand for some of its products as consumers opt for electric vehicles, or EVs, and other renewable energy technologies. “As you see more renewables and EVs, we also will see an impact on copper demand,” Fiona Wild, BHP’s…