I'm so sure Toyoda's doing some 4D chess move here, given world's increasing renewable energy meant there's going to be demand for energy absorption at will and hydrogen is their answer to help managing the renewable grid.

During the height of renewable energy production the cost of energy would probably even drop to negative, and hydrogen no matter how inefficient can still "regen" it into hydrogen. and the rest is just pricing and betterment of technology.

extremely ambitious but if anyone can pull it off it'd be them.