> High-efficiency electrolysis of iron oxide can store as much as 80 percent of your input energy in the iron fuel Looks promising for home heating during the

> High-efficiency electrolysis of iron oxide can store as much as 80 percent of your input energy in the iron fuel Looks promising for home heating during the winter; especially promising for areas of the world where the winter day is so short that using solar + battery for heating is impractical. > Using this kind of cyclical process to generate electricity could approach a theoretical efficiency around 40 percent My heat pump (air based) has a COE of 2.7. If the electricity was stored at 40% efficiency, that means I'm getting back 108% of the energy if combusting iron is used to store the energy! Note: Where I live we have an old oil plant that only runs during cold snaps; and a newer gas plant next to it that runs when renewables are scarce.