Oh wow. I read about that project some time last year. But I didn't do the calculations back then. If I did my math correctly then this H2-in-iron comes out to 2EUR/kWh_el. I wonder what the catch is
how much of kWh is your house needing for heating, hot water and how much for tv,notebook etc ? calculate what percentage / ratio your tv is. caring about electricity is nonsense, care about 95% of your household consumption. and yes your cooling bill is 0 dollars because you have PV on roof.