You need to pressurize the hydrogen to 5-10 kpsi which requires a compressor in every home, this cuts efficiency. Electrolysis is also very inefficient (%65 is

You need to pressurize the hydrogen to 5-10 kpsi which requires a compressor in every home, this cuts efficiency. Electrolysis is also very inefficient (%65 is usually cities as the upper efficiency[1]). Most importantly the cheapest way to produce hydrogen is through stream reformation of Carbon based fuel (high CO2 emissions req), making electrolysis cost prohibitive. Hydrogen is not a great way to go, especially when you consider that batteries and electric motors are already very efficient. Working on energy density in batteries would be more cost effective then chasing after H2. [1]http://gcep.stanford.edu/pdfs/hydrogen_workshop/MacQueen.pdf http://gcep.stanford.edu/pdfs/hydrogen_workshop/MacQueen.pdf