[ChrisMarshallNY]

From what I Understand, hydrogen is fiendishly difficult to transmit.

It can be stored OK, but getting it from Point A, to Point B, is difficult, because of the small atoms. Couplings tend to leak like hell.

[etrautmann]

Yep, hydrogen is so small it can diffuse through most solids and find the tiniest of gaps, and it requires high pressure or cryo double walled storage. Very cool if it can be made to work though!