WEIRTON, W.Va.—For decades, iron ore was shipped into a sprawling steel mill on the banks of the Ohio River near Pittsburgh. Iron deliveries will resume soon at the 55-acre site, this time as a key ingredient in batteries fueled by green energy.
Instead of being turned into steel, the iron rusts when exposed to oxygen. The chemical reaction discharges electricity that can power homes and businesses for 100 consecutive hours, according to the company.
When these iron batteries are tapped out, they will be recharged with renewable power, turning the rust back into iron. The batteries are designed to absorb large amounts of electricity when the sun is shining and the wind is blowing, adding resiliency to power grids. The Wall Street Journal