Alternative Energy Enters the Iron Age
Using metal to store and transport renewable energy
But Dr. Jeff Bergthorson, a professor of Mechanical Engineering at McGill University, and his colleagues, think the answer could be metals. Electrical energy could be used to smelt ore into pure metal, effectively storing that energy chemically in the metal, the way energy is stored in a battery.
Then, to liberate the energy, the metals could be powdered and burned - reacted quickly with oxygen to form metal oxides, producing heat in much the way fossil fuels are burned. The metal oxides could then be recycled by using electricity to smelt them back into pure metal again.