It may be a reasonable use after we get a lot of excess peak production but for now the more efficient storage (pumped hydro or battery) is probably the better

It may be a reasonable use after we get a lot of excess peak production but for now the more efficient storage (pumped hydro or battery) is probably the better use of our power. Someone with a better source on the numbers could definitely do the math for which removes more carbon; replacing replacing a nighttime power plant (coal/NG) or replacing some of the fuel supply. I can't imagine the CO_2 -> Fuel process is particularly efficient.