Re: 50 miles???
Ah, so you're conceding that the distribution network has the capacity.
Not at all. We can't even realistically generate the required energy, and so the question of whether it can be distributed to all the places that need it is somewhat moot.
Apparently you think that "viable" means that something can be done for free
No, it would require massive investment, of course. I question whether that investment is appropriate, there are alternative technologies such as biofuels, methanol, etc. which would integrate into the existing infrastructure with far less cost and disruption. Investent should be going to that research, not spent on an impractical dead-end niche market.